1 News for the tz database 2 3 Release 2026c - 2026-07-08 10:23:58 -0700 4 5 Briefly: 6 Alberta moved to permanent -06 on 2026-06-18. 7 Morocco moves to permanent +00 on 2026-09-20. 8 More integer overflow bugs have been fixed in zic. 9 10 Changes to future timestamps 11 12 Albertas 2026-03-08 spring forward was its last foreseeable clock 13 change, as it moved to permanent -06 thereafter. (Thanks to Roozbeh 14 Pournader and others.) Model this with its traditional abbreviation 15 CST. Although the change to permanent -06 legally took place on 16 2026-06-18, temporarily model the change to occur on 2026-11-01 at 17 02:00 instead, for the same reason we introduced a similarly 18 temporary hack for British Columbia in 2026b. 19 20 Although another TZDB release will likely be needed soon because 21 Northwest Territories will likely follow Alberta, the legal 22 formalities have not yet taken place. 23 24 Morocco plans to move back to permanent UTC, without daylight 25 saving time transitions, on 2026-09-20 at 02:00. This also 26 affects Western Sahara. 27 28 Changes to code 29 30 zic no longer overflows integers when processing outlandish input 31 like Zone Ouch 0 - LMT 9223372036854775807, Zone Ouch 0 32 2562047788015215 LMT, Zone Ouch -2562047788015215:30:08 - LMT, 33 and Zone Ouch -2562047788015215:30:08 - %%z. This avoids 34 undefined behavior in C. (Problems reported by Naveed Khan.) 35 36 On platforms that have EFTYPE, tzalloc now fails with errno set to 37 EFTYPE, not EINVAL, if it detects that the TZif file has an 38 invalid format or is not a regular file. Formerly it did this 39 only on NetBSD, and only when the file was not a regular file. 40 41 Unprivileged programs no longer require TZif files to be regular 42 files or reject relative names containing ".." components. This 43 reverts to the more-permissive 2025b behavior, as the stricter 44 behavior did not catch on in FreeBSD. 45 46 zic now reports any failure to remove a temporary file when 47 cleaning up after a previous failure. (Problem reported by Tom 48 Lane.) 49 50 Changes to commentary 51 52 Northwest Territories is expected to move to permanent -06 prior to 53 2026-11-01 02:00, when clocks would otherwise fall back. (Thanks to 54 Tim Parenti and James Bellaire.) Model this with its traditional 55 abbreviation CST. Unfortunately the change is not yet official, so 56 it is currently present only as comments that can be uncommented as 57 needed. 58 59 Changes to build procedure 60 61 The undocumented typecheck Makefile check rule has been removed. 62 It stopped working in 2025a and evidently nobody noticed. 63 The rule was superseded by check_time_t_alternatives in 2013d. 64 65 66 Release 2026b - 2026-04-22 23:06:43 -0700 67 68 Briefly: 69 British Columbia moved to permanent -07 on 2026-03-09. 70 Some more overflow bugs have been fixed in zic. 71 72 Changes to future timestamps 73 74 British Columbias 2026-03-08 spring forward was its last 75 foreseeable clock change, as it moved to permanent -07 thereafter. 76 (Thanks to Arthur David Olson.) Although the change to permanent 77 -07 legally took place on 2026-03-09, temporarily model the change 78 to occur on 2026-11-01 at 02:00 instead. This works around a 79 limitation in CLDR 48.1 (2026-01-08). This temporary hack is 80 planned to be removed after CLDR is fixed. 81 82 Changes to code 83 84 zic no longer mishandles a last transition to a new time type. 85 86 zic no longer overflows a buffer when generating a TZ string like 87 "PST-167:59:58PDT-167:59:59,M11.5.6/-167:59:59,M12.5.6/-167:59:59", 88 which can occur with adversarial input. (Thanks to Naveed Khan.) 89 90 zic no longer generates a longer TZif file than necessary when 91 an earlier time zone abbreviation is a suffix of a later one. 92 As a nice side effect, zic no longer overflows a buffer when given 93 a long series of abbreviations, each a suffix of the next. 94 (Buffer overflow reported by Arthur Chan.) 95 96 zic no longer overflows an int when processing input like Zone 97 Ouch 2147483648:00:00 - LMT. The int overflow can lead to buffer 98 overflow in adversarial cases. (Thanks to Naveed Khan.) 99 100 zic now checks for signals more often. 101 102 103 Release 2026a - 2026-03-01 22:59:49 -0800 104 105 Briefly: 106 Moldova has used EU transition times since 2022. 107 The right TZif files are no longer installed by default. 108 -DTZ_RUNTIME_LEAPS=0 disables runtime support for leap seconds. 109 TZif files are no longer limited to 50 bytes of abbreviations. 110 zic is no longer limited to 50 leap seconds. 111 Several integer overflow bugs have been fixed. 112 113 Changes to past and future timestamps 114 115 Since 2022 Moldova has observed EU transition times, that is, it 116 has sprung forward at 03:00, not 02:00, and has fallen back at 117 04:00, not 03:00. (Thanks to Heitor David Pinto.) 118 119 Changes to data 120 121 Remove Europe/Chisinau from zonenow.tab, as it now agrees with 122 Europe/Athens for future timestamps. 123 124 Changes to build procedure 125 126 The Makefile no longer by default installs an alternate set 127 of TZif files for system clocks that count leap seconds. 128 Install with make REDO=posix_right to get the old default, 129 which is rarely used in major downstream distributions. 130 If your system clock counts leap seconds (contrary to POSIX), 131 it is better to install with make REDO=right_only. 132 This change does not affect the leapseconds file, which is still 133 installed as before. 134 135 The Makefiles POSIXRULES option, which was declared obsolete in 136 release 2019b, has been removed. The Makefiles build procedure 137 thus no longer optionally installs the obsolete posixrules file. 138 139 Changes to code 140 141 Compiling with the new option -DTZ_RUNTIME_LEAPS=0 disables 142 runtime support for leap seconds. Although this conforms to 143 POSIX, shrinks tzcodes attack surface, and is more efficient, 144 it fails to support Internet RFC 9636s leap seconds. 145 146 zic now can generate, and localtime.c can now use, TZif files that 147 hold up to 256 bytes of abbreviations, counting trailing NULs. 148 The previous limit was 50 bytes, and some tzdata TZif files were 149 already consuming 40 bytes. zic -v warns if it generates a file 150 that exceeds the old 50-byte limit. 151 152 zic -L can now generate TZif files with more than 50 leap seconds. 153 This helps test TZif readers not limited to 50 leap seconds, as 154 tzcodes localtime.c is; it has little immediate need for 155 practical timekeeping as there have been only 27 leap seconds and 156 possibly there will be no more, due to planned changes to UTC. 157 zic -v warns if its output exceeds the old 50-second limit. 158 159 localtime.c no longer accesses the posixrules file generated by 160 zic -p. Hence for obsolete and nonconforming settings like 161 TZ="AST4ADT" it now typically falls back on US DST rules, rather 162 than attempting to override this fallback with the contents of the 163 posixrules file. This removes library support that was declared 164 obsolete in release 2019b, and fixes some undefined behavior. 165 (Undefined behavior reported by Naveed Khan.) 166 167 The posix2time, posix2time_z, time2posix, and time2posix_z 168 functions now set errno=EOVERFLOW and return ((time_t) -1) if the 169 result is not representable. Formerly they had undefined behavior 170 that could in practice result in crashing, looping indefinitely, 171 or returning an incorrect result. As before, these functions are 172 defined only when localtime.c is compiled with the -DSTD_INSPIRED 173 option. 174 175 Some other undefined behavior, triggered by TZif files containing 176 outlandish but conforming UT offsets or leap second corrections, 177 has also been fixed. (Some of these bugs reported by Naveed Khan.) 178 179 localtime.c no longer rejects TZif files that exactly fit in its 180 internal structures, fixing off-by-one typos introduced in 2014g. 181 182 zic no longer generates a no-op transition when 183 simultaneous Rule and Zone changes cancel each other out. 184 This occurs in tzdata only in Asia/Tbilisi on 1997-03-30. 185 (Thanks to Renchunhui for a test case showing the bug.) 186 187 zic no longer assumes you can fflush a read-only stream. 188 (Problem reported by Christos Zoulas.) 189 190 zic no longer generates UT offsets equal to -2**31 and localtime.c 191 no longer accepts them, as they can cause trouble in both 192 localtime.c and its callers. RFC 9636 prohibits such offsets. 193 194 zic -p now warns that the -p option is obsolete and likely 195 ineffective. 196 197 198 Release 2025c - 2025-12-10 14:42:37 -0800 199 200 Briefly: 201 Several code changes for compatibility with FreeBSD. 202 203 Changes to past timestamps 204 205 Baja California agreed with Californias DST rules in 1953 and in 206 1961 through 1975, instead of observing standard time all year. 207 (Thanks to Alois Treindl.) 208 209 Changes to build procedure 210 211 Files in distributed tarballs now have correct commit times. 212 Formerly, the committers time zone was incorrectly ignored. 213 214 Distribution products (*.asc, *.gz, and *.lz) now have 215 reproducible timestamps. Formerly, only the contents of the 216 compressed tarballs had reproducible timestamps. 217 218 By default, distributed formatted man pages (*.txt) now use UTF-8 219 and are left-adjusted more consistently. A new Makefile macro 220 MANFLAGS can override these defaults. (Thanks to G. Branden 221 Robinson for inspiring these changes.) 222 223 Changes to code 224 225 An unset TZ is no longer invalid when /etc/localtime is missing, 226 and is abbreviated "UTC" not "-00". This reverts to 2024b behavior. 227 (Problem and patch reported by Dag-Erling Smrgrav.) 228 229 New function offtime_r, short for fixed-offset localtime_rz. 230 It is defined if STD_INSPIRED is defined. 231 (Patch from Dag-Erling Smrgrav.) 232 233 tzset etc. are now more cautious about questionable TZ settings. 234 Privileged programs now reject TZ settings that start with '/', 235 unless they are TZDEFAULT (default "/etc/localtime") or 236 start with TZDIR then '/' (default "/usr/share/zoneinfo/"). 237 Unprivileged programs now require files to be regular files 238 and reject relative names containing ".." directory components; 239 formerly, only privileged programs did those two things. 240 These changes were inspired by similar behavior in FreeBSD. 241 On NetBSD, unprivileged programs now use O_REGULAR to check 242 whether a TZ setting starting with '/' names a regular file, 243 avoiding a minor security race still present elsewhere. 244 TZ strings taken from tzalloc arguments are now treated with 245 no less caution than TZ strings taken from the environment, as 246 the old undocumented behavior would have been hard to explain. 247 tzset etc. no longer use the access system call to check access; 248 instead they now use the system calls issetugid, getauxval, 249 getresuid/getresgid, and geteuid/getegid/getuid/getgid (whichever 250 first works) to test whether a program is privileged. 251 Compile with -DHAVE_SYS_AUXV_H=[01] to enable or disable 252 <sys/auxv.h> which (if it defines AT_SECURE) enables getauxval, 253 and compile with -DHAVE_ISSETUGID=[01], -DHAVE_GETRESUID=[01], and 254 -DHAVE_GETEUID=[01] to enable or disable the other calls use. 255 256 The new CFLAGS option -DTZ_CHANGE_INTERVAL=N makes tzset etc. 257 check for TZif file changes if the in-memory data are N seconds 258 old or more, and are derived from the TZ environment variable. 259 This is intended for platforms that want tzset etc. to reflect 260 changes to whatever file TZ selects (including changes to 261 /etc/localtime if TZ is unset). If N is negative (the default) 262 these checks are omitted; this is the traditional behavior. 263 264 The new CFLAGS options -DHAVE_STRUCT_STAT_ST_CTIM=0 and 265 -DHAVE_STRUCT_TIMESPEC=0 port to non-POSIX.1-2008 platforms 266 that lack st_ctim and struct timespec, respectively. 267 On these platforms, the code falls back on st_ctime to 268 implement -DTZ_CHANGE_INTERVAL=N. 269 270 tzset etc. now treat ' ' like '_' in time zone abbreviations, 271 just as they treat other invalid bytes. This continues the 272 transition begun in release 96k, which removed spaces in tzdata 273 because the spaces break time string parsers. 274 275 The new CFLAGS option -DTHREAD_PREFER_SINGLE causes tzcode 276 in single-threaded processes to avoid locks, as FreeBSD does. 277 This can save time in single-threaded apps. The threadedness 278 testing costs CPU time and energy in multi-threaded apps. 279 New options -DHAVE___ISTHREADED and -DHAVE_SYS_SINGLE_THREADED_H 280 can help configure how to test for single-threadedness. 281 282 The new CFLAGS option -DTHREAD_RWLOCK uses read-write locks, as 283 macOS does, instead of mutexes. This saves real time when TZ is 284 rarely changing and many threads call tzcode simultaneously. 285 It costs more CPU time and energy. 286 287 The new CFLAGS option -DTHREAD_TM_MULTI causes localtime to return 288 a pointer to thread-specific memory, as FreeBSD does, instead of 289 to the same memory in all threads. This supports nonportable 290 programs that incorrectly use localtime instead of localtime_r. 291 This option affects gmtime and offtime similarly to localtime. 292 Because the corresponding storage is freed on thread exit, this 293 option is incompatible with POSIX.1-2024 and earlier. It also 294 costs CPU time and memory. 295 296 tzfree now preserves errno, consistently with POSIX.1-2024 free. 297 298 tzcode now uses mempcpy if available, guessing its availability. 299 Compile with -DHAVE_MEMPCPY=1 or 0 to override the guess. 300 301 tzcode now uses strnlen to improve asymptotic performance a bit. 302 Compile with -DHAVE_STRNLEN=0 if your platform lacks it. 303 304 tzcode now hand-declares unistd.h-provided symbols like getopt 305 if HAVE_UNISTD_H=0, not if HAVE_POSIX_DECLS=0. 306 307 tzset etc. now have an experimental OPENAT_TZDIR option; 308 see Makefile and localtime.c for details. 309 310 On platforms like GNU/Hurd that do not define PATH_MAX, 311 exceedingly long TZ strings no longer fail merely because they 312 exceed an arbitrary file name length limit imposed by tzcode. 313 314 zic has new options inspired by FreeBSD. -D skips creation of 315 output ancestor directories, -m MODE sets output files mode, 316 and -u OWNER[:GROUP] sets output files owner and group. 317 318 zic now uses the fdopen function, which was standardized by 319 POSIX.1-1988 and is now safe to use in portable code. 320 This replaces its use of the older umask function, which 321 complicated maintenance. 322 323 Changes to commentary 324 325 The leapseconds file contains commentary about the IERS and NIST 326 last-modified and expiration timestamps for leap second data. 327 (Thanks to Judah Levine.) 328 329 Commentary now also uses characters from the set as this 330 can be useful and should work with current applications. This 331 also affects data in iso3166.tab and zone1970.tab, which now 332 contain strings like Cte dIvoire instead of Cte d'Ivoire. 333 334 335 Release 2025b - 2025-03-22 13:40:46 -0700 336 337 Briefly: 338 New zone for Aysn Region in Chile which moves from -04/-03 to -03. 339 340 Changes to future timestamps 341 342 Chile's Aysn Region moves from -04/-03 to -03 year-round, joining 343 Magallanes Region. The region will not change its clocks on 344 2025-04-05 at 24:00, diverging from America/Santiago and creating a 345 new zone America/Coyhaique. (Thanks to Yonathan Dossow.) Model 346 this as a change to standard offset effective 2025-03-20. 347 348 Changes to past timestamps 349 350 Iran switched from +04 to +0330 on 1978-11-10 at 24:00, not at 351 year end. (Thanks to Roozbeh Pournader.) 352 353 Changes to code 354 355 'zic -l TIMEZONE -d . -l /some/other/file/system' no longer 356 attempts to create an incorrect symlink, and no longer has a 357 read buffer underflow. (Problem reported by Evgeniy Gorbanev.) 358 359 360 Release 2025a - 2025-01-15 10:47:24 -0800 361 362 Briefly: 363 Paraguay adopted permanent -03 starting spring 2024. 364 Improve pre-1991 data for the Philippines. 365 Etc/Unknown is now reserved. 366 367 Changes to future timestamps 368 369 Paraguay stopped changing its clocks after the spring-forward 370 transition on 2024-10-06, so it is now permanently at -03. 371 (Thanks to Heitor David Pinto and Even Scharning.) 372 This affects timestamps starting 2025-03-22, as well as the 373 obsolescent tm_isdst flags starting 2024-10-15. 374 375 Changes to past timestamps 376 377 Correct timestamps for the Philippines before 1900, and from 1937 378 through 1990. (Thanks to P Chan for the heads-up and citations.) 379 This includes adjusting local mean time before 1899; fixing 380 transitions in September 1899, January 1937, and June 1954; adding 381 transitions in December 1941, November 1945, March and September 382 1977, and May and July 1990; and removing incorrect transitions in 383 March and September 1978. 384 385 Changes to data 386 387 Add zone1970.tab lines for the Concordia and Eyre Bird Observatory 388 research stations. (Thanks to Derick Rethans and Jule Dabars.) 389 390 Changes to code 391 392 strftime %s now generates the correct numeric string even when the 393 represented number does not fit into time_t. This is better than 394 generating the numeric equivalent of (time_t) -1, as strftime did 395 in TZDB releases 96a (when %s was introduced) through 2020a and in 396 releases 2022b through 2024b. It is also better than failing and 397 returning 0, as strftime did in releases 2020b through 2022a. 398 399 strftime now outputs an invalid conversion specifier as-is, 400 instead of eliding the leading '%', which confused debugging. 401 402 An invalid TZ now generates the time zone abbreviation "-00", not 403 "UTC", to help the user see that an error has occurred. (Thanks 404 to Arthur David Olson for suggesting a "wrong result".) 405 406 mktime and timeoff no longer incorrectly fail merely because a 407 struct tm component near INT_MIN or INT_MAX overflows when a 408 lower-order component carries into it. 409 410 TZNAME_MAXIMUM, the maximum number of bytes in a proleptic TZ 411 string's time zone abbreviation, now defaults to 254 not 255. 412 This helps reduce the size of internal state from 25480 to 21384 413 on common platforms. This change should not be a problem, as 414 nobody uses such long "abbreviations" and the longstanding tzcode 415 maximum was 16 until release 2023a. For those who prefer no 416 arbitrary limits, you can now specify TZNAME_MAXIMUM values up to 417 PTRDIFF_MAX, a limit forced by C anyway; formerly tzcode silently 418 misbehaved unless TZNAME_MAXIMUM was less than INT_MAX. 419 420 tzset and related functions no longer leak a file descriptor if 421 another thread forks or execs at about the same time and if the 422 platform has O_CLOFORK and O_CLOEXEC respectively. Also, the 423 functions no longer let a TZif file become a controlling terminal. 424 425 'zdump -' now reads TZif data from /dev/stdin. 426 (From a question by Arthur David Olson.) 427 428 Changes to documentation 429 430 The name Etc/Unknown is now reserved: it will not be used by TZDB. 431 This is for compatibility with CLDR, which uses the string 432 "Etc/Unknown" for an unknown or invalid timezone. (Thanks to 433 Justin Grant, Mark Davis, and Guy Harris.) 434 435 Cite Internet RFC 9636, which obsoletes RFC 8536 for TZif format. 436 437 438 Release 2024b - 2024-09-04 12:27:47 -0700 439 440 Briefly: 441 Improve historical data for Mexico, Mongolia, and Portugal. 442 System V names are now obsolescent. 443 The main data form now uses %z. 444 The code now conforms to RFC 8536 for early timestamps. 445 Support POSIX.1-2024, which removes asctime_r and ctime_r. 446 Assume POSIX.2-1992 or later for shell scripts. 447 SUPPORT_C89 now defaults to 1. 448 449 Changes to past timestamps 450 451 Asia/Choibalsan is now an alias for Asia/Ulaanbaatar rather than 452 being a separate Zone with differing behavior before April 2008. 453 This seems better given our wildly conflicting information about 454 Mongolia's time zone history. (Thanks to Heitor David Pinto.) 455 456 Historical transitions for Mexico have been updated based on 457 official Mexican decrees. The affected timestamps occur during 458 the years 1921-1927, 1931, 1945, 1949-1970, and 1981-1997. 459 The affected zones are America/Bahia_Banderas, America/Cancun, 460 America/Chihuahua, America/Ciudad_Juarez, America/Hermosillo, 461 America/Mazatlan, America/Merida, America/Mexico_City, 462 America/Monterrey, America/Ojinaga, and America/Tijuana. 463 (Thanks to Heitor David Pinto.) 464 465 Historical transitions for Portugal, represented by Europe/Lisbon, 466 Atlantic/Azores, and Atlantic/Madeira, have been updated based on a 467 close reading of old Portuguese legislation, replacing previous data 468 mainly originating from Whitman and Shanks & Pottenger. These 469 changes affect a few transitions in 1917-1921, 1924, and 1940 470 throughout these regions by a few hours or days, and various 471 timestamps between 1977 and 1993 depending on the region. In 472 particular, the Azores and Madeira did not observe DST from 1977 to 473 1981. Additionally, the adoption of standard zonal time in former 474 Portuguese colonies have been adjusted: Africa/Maputo in 1909, and 475 Asia/Dili by 22 minutes at the start of 1912. 476 (Thanks to Tim Parenti.) 477 478 Changes to past tm_isdst flags 479 480 The period from 1966-04-03 through 1966-10-02 in Portugal is now 481 modeled as DST, to more closely reflect how contemporaneous changes 482 in law entered into force. 483 484 Changes to data 485 486 Names present only for compatibility with UNIX System V 487 (last released in the 1990s) have been moved to 'backward'. 488 These names, which for post-1970 timestamps mostly just duplicate 489 data of geographical names, were confusing downstream uses. 490 Names moved to 'backward' are now links to geographical names. 491 This affects behavior for TZ='EET' for some pre-1981 timestamps, 492 for TZ='CET' for some pre-1947 timestamps, and for TZ='WET' for 493 some pre-1996 timestamps. Also, TZ='MET' now behaves like 494 TZ='CET' and so uses the abbreviation "CET" rather than "MET". 495 Those needing the previous TZDB behavior, which does not match any 496 real-world clocks, can find the old entries in 'backzone'. 497 (Problem reported by Justin Grant.) 498 499 The main source files' time zone abbreviations now use %z, 500 supported by zic since release 2015f and used in vanguard form 501 since release 2022b. For example, America/Sao_Paulo now contains 502 the zone continuation line "-3:00 Brazil %z", which is less error 503 prone than the old "-3:00 Brazil -03/-02". This does not change 504 the represented data: the generated TZif files are unchanged. 505 Rearguard form still avoids %z, to support obsolescent parsers. 506 507 Asia/Almaty has been removed from zonenow.tab as it now agrees 508 with Asia/Tashkent for future timestamps, due to Kazakhstan's 509 2024-02-29 time zone change. Similarly, America/Scoresbysund 510 has been removed, as it now agrees with America/Nuuk due to 511 its 2024-03-31 time zone change. 512 513 Changes to code 514 515 localtime.c now always uses a TZif file's time type 0 to handle 516 timestamps before the file's first transition. Formerly, 517 localtime.c sometimes inferred a different time type, in order to 518 handle problematic data generated by zic 2018e or earlier. As it 519 is now safe to assume more recent versions of zic, there is no 520 longer a pressing need to fail to conform RFC 8536 section 3.2, 521 which requires using time type 0 in this situation. This change 522 does not affect behavior when reading TZif files generated by zic 523 2018f and later. 524 525 POSIX.1-2024 removes asctime_r and ctime_r and does not let 526 libraries define them, so remove them except when needed to 527 conform to earlier POSIX. These functions are dangerous as they 528 can overrun user buffers. If you still need them, add 529 -DSUPPORT_POSIX2008 to CFLAGS. 530 531 The SUPPORT_C89 option now defaults to 1 instead of 0, fixing a 532 POSIX-conformance bug introduced in 2023a. 533 534 tzselect now supports POSIX.1-2024 proleptic TZ strings. Also, it 535 assumes POSIX.2-1992 or later, as practical porting targets now 536 all support that, and it uses some features from POSIX.1-2024 if 537 available. 538 539 Changes to build procedure 540 541 'make check' no longer requires curl and Internet access. 542 543 The build procedure now assumes POSIX.2-1992 or later, to simplify 544 maintenance. To build on Solaris 10, the only extant system still 545 defaulting to pre-POSIX, prepend /usr/xpg4/bin to PATH. 546 547 Changes to documentation 548 549 The documentation now reflects POSIX.1-2024. 550 551 Changes to commentary 552 553 Commentary about historical transitions in Portugal and her former 554 colonies has been expanded with links to relevant legislation. 555 (Thanks to Tim Parenti.) 556 557 558 Release 2024a - 2024-02-01 09:28:56 -0800 559 560 Briefly: 561 Kazakhstan unifies on UTC+5 beginning 2024-03-01. 562 Palestine springs forward a week later after Ramadan. 563 zic no longer pretends to support indefinite-past DST. 564 localtime no longer mishandles Ciudad Jurez in 2422. 565 566 Changes to future timestamps 567 568 Kazakhstan unifies on UTC+5. This affects Asia/Almaty and 569 Asia/Qostanay which together represent the eastern portion of the 570 country that will transition from UTC+6 on 2024-03-01 at 00:00 to 571 join the western portion. (Thanks to Zhanbolat Raimbekov.) 572 573 Palestine springs forward a week later than previously predicted 574 in 2024 and 2025. (Thanks to Heba Hamad.) Change spring-forward 575 predictions to the second Saturday after Ramadan, not the first; 576 this also affects other predictions starting in 2039. 577 578 Changes to past timestamps 579 580 Asia/Ho_Chi_Minh's 1955-07-01 transition occurred at 01:00 581 not 00:00. (Thanks to on Trn Cng Danh.) 582 583 From 1947 through 1949, Toronto's transitions occurred at 02:00 584 not 00:00. (Thanks to Chris Walton.) 585 586 In 1911 Miquelon adopted standard time on June 15, not May 15. 587 588 Changes to code 589 590 The FROM and TO columns of Rule lines can no longer be "minimum" 591 or an abbreviation of "minimum", because TZif files do not support 592 DST rules that extend into the indefinite past - although these 593 rules were supported when TZif files had only 32-bit data, this 594 stopped working when 64-bit TZif files were introduced in 1995. 595 This should not be a problem for realistic data, since DST was 596 first used in the 20th century. As a transition aid, FROM columns 597 like "minimum" are now diagnosed and then treated as if they were 598 the year 1900; this should suffice for TZif files on old systems 599 with only 32-bit time_t, and it is more compatible with bugs in 600 2023c-and-earlier localtime.c. (Problem reported by Yoshito 601 Umaoka.) 602 603 localtime and related functions no longer mishandle some 604 timestamps that occur about 400 years after a switch to a time 605 zone with a DST schedule. In 2023d data this problem was visible 606 for some timestamps in November 2422, November 2822, etc. in 607 America/Ciudad_Juarez. (Problem reported by Gilmore Davidson.) 608 609 strftime %s now uses tm_gmtoff if available. (Problem and draft 610 patch reported by Dag-Erling Smrgrav.) 611 612 Changes to build procedure 613 614 The leap-seconds.list file is now copied from the IERS instead of 615 from its downstream counterpart at NIST, as the IERS version is 616 now in the public domain too and tends to be more up-to-date. 617 (Thanks to Martin Burnicki for liaising with the IERS.) 618 619 Changes to documentation 620 621 The strftime man page documents which struct tm members affect 622 which conversion specs, and that tzset is called. (Problems 623 reported by Robert Elz and Steve Summit.) 624 625 626 Release 2023d - 2023-12-21 20:02:24 -0800 627 628 Briefly: 629 Ittoqqortoormiit, Greenland changes time zones on 2024-03-31. 630 Vostok, Antarctica changed time zones on 2023-12-18. 631 Casey, Antarctica changed time zones five times since 2020. 632 Code and data fixes for Palestine timestamps starting in 2072. 633 A new data file zonenow.tab for timestamps starting now. 634 635 Changes to future timestamps 636 637 Ittoqqortoormiit, Greenland (America/Scoresbysund) joins most of 638 the rest of Greenland's timekeeping practice on 2024-03-31, by 639 changing its time zone from -01/+00 to -02/-01 at the same moment 640 as the spring-forward transition. Its clocks will therefore not 641 spring forward as previously scheduled. The time zone change 642 reverts to its common practice before 1981. (Thanks to Jule Dabars.) 643 644 Fix predictions for DST transitions in Palestine in 2072-2075, 645 correcting a typo introduced in 2023a. (Thanks to Jule Dabars.) 646 647 Changes to past and future timestamps 648 649 Vostok, Antarctica changed to +05 on 2023-12-18. It had been at 650 +07 (not +06) for years. (Thanks to Zakhary V. Akulov.) 651 652 Change data for Casey, Antarctica to agree with timeanddate.com, 653 by adding five time zone changes since 2020. Casey is now at +08 654 instead of +11. 655 656 Changes to past tm_isdst flags 657 658 Much of Greenland, represented by America/Nuuk, changed its 659 standard time from -03 to -02 on 2023-03-25, not on 2023-10-28. 660 This does not affect UTC offsets, only the tm_isdst flag. 661 (Thanks to Thomas M. Steenholdt.) 662 663 New data file 664 665 A new data file zonenow.tab helps configure applications that use 666 timestamps dated from now on. This simplifies configuration, 667 since users choose from a smaller Zone set. The file's format is 668 experimental and subject to change. 669 670 Changes to code 671 672 localtime.c no longer mishandles TZif files that contain a single 673 transition into a DST regime. Previously, it incorrectly assumed 674 DST was in effect before the transition too. (Thanks to Alois 675 Treindl for debugging help.) 676 677 localtime.c's timeoff no longer collides with OpenBSD 7.4. 678 679 The C code now uses _Generic only if __STDC_VERSION__ says the 680 compiler is C11 or later. 681 682 tzselect now optionally reads zonenow.tab, to simplify when 683 configuring only for timestamps dated from now on. 684 685 tzselect no longer creates temporary files. 686 687 tzselect no longer mishandles the following: 688 689 Spaces and most other special characters in BUGEMAIL, PACKAGE, 690 TZDIR, and VERSION. 691 692 TZ strings when using mawk 1.4.3, which mishandles regular 693 expressions of the form /X{2,}/. 694 695 ISO 6709 coordinates when using an awk that lacks the GNU 696 extension of newlines in -v option-arguments. 697 698 Non UTF-8 locales when using an iconv command that lacks the GNU 699 //TRANSLIT extension. 700 701 zic no longer mishandles data for Palestine after the year 2075. 702 Previously, it incorrectly omitted post-2075 transitions that are 703 predicted for just before and just after Ramadan. (Thanks to Ken 704 Murchison for debugging help.) 705 706 zic now works again on Linux 2.6.16 and 2.6.17 (2006). 707 (Problem reported by Rune Torgersen.) 708 709 Changes to build procedure 710 711 The Makefile is now more compatible with POSIX: 712 * It no longer defines AR, CC, CFLAGS, LDFLAGS, and SHELL. 713 * It no longer uses its own 'cc' in place of CC. 714 * It now uses ARFLAGS, with default specified by POSIX. 715 * It does not use LFLAGS incompatibly with POSIX. 716 * It uses the special .POSIX target. 717 * It quotes special characters more carefully. 718 * It no longer mishandles builds in an ISO 8859 locale. 719 Due to the CC changes, TZDIR is now #defined in a file tzdir.h 720 built by 'make', not in a $(CC) -D option. Also, TZDEFAULT is 721 now treated like TZDIR as they have similar roles. 722 723 Changes to commentary 724 725 Limitations and hazards of the optional support for obsolescent 726 C89 platforms are documented better, along with a tentative 727 schedule for removing this support. 728 729 730 Release 2023c - 2023-03-28 12:42:14 -0700 731 732 Changes to past and future timestamps 733 734 Model Lebanon's DST chaos by reverting data to tzdb 2023a. 735 (Thanks to Rany Hany for the heads-up.) 736 737 738 Release 2023b - 2023-03-23 19:50:38 -0700 739 740 Changes to future timestamps 741 742 This year Lebanon springs forward April 20/21 not March 25/26. 743 (Thanks to Saadallah Itani.) [This was reverted in 2023c.] 744 745 746 Release 2023a - 2023-03-22 12:39:33 -0700 747 748 Briefly: 749 Egypt now uses DST again, from April through October. 750 This year Morocco springs forward April 23, not April 30. 751 Palestine delays the start of DST this year. 752 Much of Greenland still uses DST from 2024 on. 753 America/Yellowknife now links to America/Edmonton. 754 tzselect can now use current time to help infer timezone. 755 The code now defaults to C99 or later. 756 Fix use of C23 attributes. 757 758 Changes to future timestamps 759 760 Starting in 2023, Egypt will observe DST from April's last Friday 761 through October's last Thursday. (Thanks to Ahmad ElDardiry.) 762 Assume the transition times are 00:00 and 24:00, respectively. 763 764 In 2023 Morocco's spring-forward transition after Ramadan 765 will occur April 23, not April 30. (Thanks to Milamber.) 766 Adjust predictions for future years accordingly. This affects 767 predictions for 2023, 2031, 2038, and later years. 768 769 This year Palestine will delay its spring forward from 770 March 25 to April 29 due to Ramadan. (Thanks to Heba Hamad.) 771 Make guesses for future Ramadans too. 772 773 Much of Greenland, represented by America/Nuuk, will continue to 774 observe DST using European Union rules. When combined with 775 Greenland's decision not to change the clocks in fall 2023, 776 America/Nuuk therefore changes from -03/-02 to -02/-01 effective 777 2023-10-29 at 01:00 UTC. (Thanks to Thomas M. Steenholdt.) 778 This change from 2022g doesn't affect timestamps until 2024-03-30, 779 and doesn't affect tm_isdst until 2023-03-25. 780 781 Changes to past timestamps 782 783 America/Yellowknife has changed from a Zone to a backward 784 compatibility Link, as it no longer differs from America/Edmonton 785 since 1970. (Thanks to Almaz Mingaleev.) This affects some 786 pre-1948 timestamps. The old data are now in 'backzone'. 787 788 Changes to past time zone abbreviations 789 790 When observing Moscow time, Europe/Kirov and Europe/Volgograd now 791 use the abbreviations MSK/MSD instead of numeric abbreviations, 792 for consistency with other timezones observing Moscow time. 793 794 Changes to code 795 796 You can now tell tzselect local time, to simplify later choices. 797 Select the 'time' option in its first prompt. 798 799 You can now compile with -DTZNAME_MAXIMUM=N to limit time zone 800 abbreviations to N bytes (default 255). The reference runtime 801 library now rejects POSIX-style TZ strings that contain longer 802 abbreviations, treating them as UTC. Previously the limit was 803 platform dependent and abbreviations were silently truncated to 804 16 bytes even when the limit was greater than 16. 805 806 The code by default is now designed for C99 or later. To build on 807 a mostly-C89 platform, compile with -DPORT_TO_C89; this should 808 work on C89 platforms that also support C99 'long long' and 809 perhaps a few other extensions to C89. To support C89 callers of 810 tzcode's library, compile with -DSUPPORT_C89; however, this could 811 trigger latent bugs in C99-or-later callers. The two new macros 812 are transitional aids planned to be removed in a future version 813 (say, in 2029), when C99 or later will be required. 814 815 The code now builds again on pre-C99 platforms, if you compile 816 with -DPORT_TO_C89. This fixes a bug introduced in 2022f. 817 818 On C23-compatible platforms tzcode no longer uses syntax like 819 'static [[noreturn]] void usage(void);'. Instead, it uses 820 '[[noreturn]] static void usage(void);' as strict C23 requires. 821 (Problem reported by Houge Langley.) 822 823 The code's functions now constrain their arguments with the C 824 'restrict' keyword consistently with their documentation. 825 This may allow future optimizations. 826 827 zdump again builds standalone with ckdadd and without setenv, 828 fixing a bug introduced in 2022g. (Problem reported by panic.) 829 830 leapseconds.awk can now process a leap seconds file that never 831 expires; this might be useful if leap seconds are discontinued. 832 833 Changes to commentary 834 835 tz-link.html has a new section "Coordinating with governments and 836 distributors". (Thanks to Neil Fuller for some of the text.) 837 838 To improve tzselect diagnostics, zone1970.tab's comments column is 839 now limited to countries that have multiple timezones. 840 841 Note that there are plans to discontinue leap seconds by 2035. 842 843 844 Release 2022g - 2022-11-29 08:58:31 -0800 845 846 Briefly: 847 The northern edge of Chihuahua changes to US timekeeping. 848 Much of Greenland stops changing clocks after March 2023. 849 Fix some pre-1996 timestamps in northern Canada. 850 C89 is now deprecated; please use C99 or later. 851 Portability fixes for AIX, libintl, MS-Windows, musl, z/OS 852 In C code, use more C23 features if available. 853 C23 timegm now supported by default 854 Fixes for unlikely integer overflows 855 856 Changes to future timestamps 857 858 In the Mexican state of Chihuahua, the border strip near the US 859 will change to agree with nearby US locations on 2022-11-30. 860 The strip's western part, represented by Ciudad Jurez, switches 861 from -06 all year to -07/-06 with US DST rules, like El Paso, TX. 862 The eastern part, represented by Ojinaga, will observe US DST next 863 year, like Presidio, TX. (Thanks to Heitor David Pinto.) 864 A new Zone America/Ciudad_Juarez splits from America/Ojinaga. 865 866 Much of Greenland, represented by America/Nuuk, stops observing 867 winter time after March 2023, so its daylight saving time becomes 868 standard time. (Thanks to Jonas Nyrup and Jrgen Appel.) 869 870 Changes to past timestamps 871 872 Changes for pre-1996 northern Canada (thanks to Chris Walton): 873 874 Merge America/Iqaluit and America/Pangnirtung into the former, 875 with a backward compatibility link for the latter name. 876 There is no good evidence the two locations differ since 1970. 877 This change affects pre-1996 America/Pangnirtung timestamps. 878 879 Cambridge Bay, Inuvik, Iqaluit, Rankin Inlet, Resolute and 880 Yellowknife did not observe DST in 1965, and did observe DST 881 from 1972 through 1979. 882 883 Whitehorse moved from -09 to -08 on 1966-02-27, not 1967-05-28. 884 885 Colombia's 1993 fallback was 02-06 24:00, not 04-04 00:00. 886 (Thanks to Alois Treindl.) 887 888 Singapore's 1981-12-31 change was at 16:00 UTC (23:30 local time), 889 not 24:00 local time. (Thanks to Geoff Clare via Robert Elz.) 890 891 Changes to code 892 893 Although tzcode still works with C89, bugs found in recent routine 894 maintenance indicate that bitrot has set in and that in practice 895 C89 is no longer used to build tzcode. As it is a maintenance 896 burden, support for C89 is planned to be removed soon. Instead, 897 please use compilers compatible with C99, C11, C17, or C23. 898 899 timegm, which tzcode implemented in 1989, will finally be 900 standardized 34 years later as part of C23, so timegm is now 901 supported even if STD_INSPIRED is not defined. 902 903 Fix bug in zdump's tzalloc emulation on hosts that lack tm_zone. 904 (Problem reported by on Trn Cng Danh.) 905 906 Fix bug in zic on hosts where malloc(0) yields NULL on success. 907 (Problem reported by Tim McBrayer for AIX 6.1.) 908 909 Fix zic configuration to avoid linkage failures on some platforms. 910 (Problems reported by Gilmore Davidson and Igor Ivanov.) 911 912 Work around MS-Windows nmake incompatibility with POSIX. 913 (Problem reported by Manuela Friedrich.) 914 915 Port mktime and strftime to debugging platforms where accessing 916 uninitialized data has undefined behavior (strftime problem 917 reported by Robert Elz). 918 919 Check more carefully for unlikely integer overflows, preferring 920 C23 <stdckdint.h> to overflow checking by hand, as the latter has 921 had obscure bugs. 922 923 Changes to build procedure 924 925 New Makefile rule check_mild that skips checking whether Link 926 lines are in the file 'backward'. (Inspired by a suggestion from 927 Stephen Colebourne.) 928 929 930 Release 2022f - 2022-10-28 18:04:57 -0700 931 932 Briefly: 933 Mexico will no longer observe DST except near the US border. 934 Chihuahua moves to year-round -06 on 2022-10-30. 935 Fiji no longer observes DST. 936 Move links to 'backward'. 937 In vanguard form, GMT is now a Zone and Etc/GMT a link. 938 zic now supports links to links, and vanguard form uses this. 939 Simplify four Ontario zones. 940 Fix a Y2438 bug when reading TZif data. 941 Enable 64-bit time_t on 32-bit glibc platforms. 942 Omit large-file support when no longer needed. 943 In C code, use some C23 features if available. 944 Remove no-longer-needed workaround for Qt bug 53071. 945 946 Changes to future timestamps 947 948 Mexico will no longer observe DST after 2022, except for areas 949 near the US border that continue to observe US DST rules. 950 On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves 951 from -07 (-06 with DST) to year-round -06, thus not changing 952 its clocks that day. The new law states that Chihuahua 953 near the US border no longer observes US DST. 954 (Thanks to gera for the heads-up about Chihuahua.) 955 956 Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.) 957 For now, assume DST is suspended indefinitely. 958 959 Changes to data 960 961 Move links to 'backward' to ease and simplify link maintenance. 962 This affects generated data only if you use 'make BACKWARD='. 963 964 GMT is now a Zone and Etc/GMT a link instead of vice versa, 965 as GMT is needed for leap second support whereas Etc/GMT is not. 966 However, this change exposes a bug in TZUpdater 2.3.2 so it is 967 present only in vanguard form for now. 968 969 Vanguard form now uses links to links, as zic now supports this. 970 971 Changes to past timestamps 972 973 Simplify four Ontario zones, as most of the post-1970 differences 974 seem to have been imaginary. (Problem reported by Chris Walton.) 975 Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay 976 to 'backzone'; backward-compatibility links still work, albeit 977 with some different timestamps before November 2005. 978 979 Changes to code 980 981 zic now supports links to links regardless of input line order. 982 For example, if Australia/Sydney is a Zone, the lines 983 Link Australia/Canberra Australia/ACT 984 Link Australia/Sydney Australia/Canberra 985 now work correctly, even though the shell commands 986 ln Australia/Canberra Australia/ACT 987 ln Australia/Sydney Australia/Canberra 988 would fail because the first command attempts to use a link 989 Australia/Canberra that does not exist until after the second 990 command is executed. Previously, zic had unspecified behavior if 991 a Link line's target was another link, and zic often misbehaved if 992 a Link line's target was a later Link line. 993 994 Fix line number in zic's diagnostic for a link to a link. 995 996 Fix a bug that caused localtime to mishandle timestamps starting 997 in the year 2438 when reading data generated by 'zic -b fat' when 998 distant-future DST transitions occur at times given in standard 999 time or in UT, not the usual case of local time. This occurs when 1000 the corresponding .zi Rule lines specify DST transitions with TO 1001 columns of 'max' and AT columns that end in 's' or 'u'. The 1002 number 2438 comes from the 32-bit limit in the year 2038, plus the 1003 400-year Gregorian cycle. (Problem reported by Bradley White.) 1004 1005 On glibc 2.34 and later, which optionally supports 64-bit time_t 1006 on platforms like x86 where time_t was traditionally 32 bits, 1007 default time_t to 64 instead of 32 bits. This lets functions like 1008 localtime support timestamps after the year 2038, and fixes 1009 year-2038 problems in zic when accessing files dated after 2038. 1010 To continue to limit time_t to 32 bits on these platforms, use 1011 "make CFLAGS='-D_TIME_BITS=32'". 1012 1013 In C code, do not enable large-file support on platforms like AIX 1014 and macOS that no longer need it now that tzcode does not use 1015 off_t or related functions like 'stat'. Large-file support is 1016 still enabled by default on GNU/Linux, as it is needed for 64-bit 1017 time_t support. 1018 1019 In C code, prefer C23 keywords to pre-C23 macros for alignof, 1020 bool, false, and true. Also, use the following C23 features if 1021 available: __has_include, unreachable. 1022 1023 zic no longer works around Qt bug 53071, as the relevant Qt 1024 releases have been out of support since 2019. This change affects 1025 only fat TZif files, as thin files never had the workaround. 1026 1027 zdump no longer modifies the environ vector when compiled on 1028 platforms lacking tm_zone or when compiled with -DUSE_LTZ=0. 1029 This avoid undefined behavior on POSIX platforms. 1030 1031 1032 Release 2022e - 2022-10-11 11:13:02 -0700 1033 1034 Briefly: 1035 Jordan and Syria switch from +02/+03 with DST to year-round +03. 1036 1037 Changes to future timestamps 1038 1039 Jordan and Syria are abandoning the DST regime and are changing to 1040 permanent +03, so they will not fall back from +03 to +02 on 1041 2022-10-28. (Thanks to Steffen Thorsen and Issam Al-Zuwairi.) 1042 1043 Changes to past timestamps 1044 1045 On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00. 1046 1047 Changes to past time zone abbreviations and DST flags 1048 1049 The temporary advancement of clocks in central Mexico in summer 1050 1931 is now treated as daylight saving time, instead of as two 1051 changes to standard time. 1052 1053 1054 Release 2022d - 2022-09-23 12:02:57 -0700 1055 1056 Briefly: 1057 Palestine transitions are now Saturdays at 02:00. 1058 Simplify three Ukraine zones into one. 1059 1060 Changes to future timestamps 1061 1062 Palestine now springs forward and falls back at 02:00 on the 1063 first Saturday on or after March 24 and October 24, respectively. 1064 This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00. 1065 (Thanks to Heba Hamad.) 1066 1067 Changes to past timestamps 1068 1069 Simplify three Ukraine zones to one, since the post-1970 1070 differences seem to have been imaginary. Move Europe/Uzhgorod and 1071 Europe/Zaporozhye to 'backzone'; backward-compatibility links 1072 still work, albeit with different timestamps before October 1991. 1073 1074 1075 Release 2022c - 2022-08-15 17:47:18 -0700 1076 1077 Briefly: 1078 Work around awk bug in FreeBSD, macOS, etc. 1079 Improve tzselect on intercontinental Zones. 1080 1081 Changes to code 1082 1083 Work around a bug in onetrueawk that broke commands like 1084 'make traditional_tarballs' on FreeBSD, macOS, etc. 1085 (Problem reported by Deborah Goldsmith.) 1086 1087 Add code to tzselect that uses experimental structured comments in 1088 zone1970.tab to clarify whether Zones like Africa/Abidjan and 1089 Europe/Istanbul cross continent or ocean boundaries. 1090 (Inspired by a problem reported by Peter Krefting.) 1091 1092 Fix bug with 'zic -d /a/b/c' when /a is unwritable but the 1093 directory /a/b already exists. 1094 1095 Remove zoneinfo2tdf.pl, as it was unused and triggered false 1096 malware alarms on some email servers. 1097 1098 1099 Release 2022b - 2022-08-10 15:38:32 -0700 1100 1101 Briefly: 1102 Chile's DST is delayed by a week in September 2022. 1103 Iran no longer observes DST after 2022. 1104 Rename Europe/Kiev to Europe/Kyiv. 1105 New zic -R option 1106 Vanguard form now uses %z. 1107 Finish moving duplicate-since-1970 zones to 'backzone'. 1108 New build option PACKRATLIST 1109 New tailored_tarballs target, replacing rearguard_tarballs 1110 1111 Changes to future timestamps 1112 1113 Chile's 2022 DST start is delayed from September 4 to September 11. 1114 (Thanks to Juan Correa.) 1115 1116 Iran plans to stop observing DST permanently, after it falls back 1117 on 2022-09-21. (Thanks to Ali Mirjamali.) 1118 1119 Changes to past timestamps 1120 1121 Finish moving to 'backzone' the location-based zones whose 1122 timestamps since 1970 are duplicates; adjust links accordingly. 1123 This change ordinarily affects only pre-1970 timestamps, and with 1124 the new PACKRATLIST option it does not affect any timestamps. 1125 In this round the affected zones are Antarctica/Vostok, 1126 Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, 1127 Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, 1128 Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, 1129 Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, 1130 Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, 1131 Pacific/Wake and Pacific/Wallis, and the affected links are 1132 Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, 1133 Pacific/Truk, and Pacific/Yap. 1134 1135 From fall 1994 through fall 1995, Shanks wrote that Crimea's 1136 DST transitions were at 02:00 standard time, not at 00:00. 1137 (Thanks to Michael Deckers.) 1138 1139 Iran adopted standard time in 1935, not 1946. In 1977 it observed 1140 DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 1141 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 1142 transition was on 05-27, not 03-21. 1143 (Thanks to Roozbeh Pournader and Francis Santoni.) 1144 1145 Chile's observance of -04 from 1946-08-29 through 1947-03-31 was 1146 considered DST, not standard time. Santiago and environs had moved 1147 their clocks back to rejoin the rest of mainland Chile; put this 1148 change at the end of 1946-08-28. (Thanks to Michael Deckers.) 1149 1150 Some old, small clock transitions have been removed, as people at 1151 the time did not change their clocks. This affects Asia/Hong_Kong 1152 in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. 1153 1154 Changes to zone name 1155 1156 Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in 1157 English now. Spelling of other names in Ukraine has not yet 1158 demonstrably changed in common English practice so for now these 1159 names retain old spellings, as in other countries (e.g., 1160 Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). 1161 1162 Changes to code 1163 1164 zic has a new option '-R @N' to output explicit transitions < N. 1165 (Need suggested by Almaz Mingaleev.) 1166 1167 'zic -r @N' no longer outputs bad data when N < first transition. 1168 (Problem introduced in 2021d and reported by Peter Krefting.) 1169 1170 zic now checks its input for NUL bytes and unterminated lines, and 1171 now supports input line lengths up to 2048 (not 512) bytes. 1172 1173 gmtime and related code now use the abbreviation "UTC" not "GMT". 1174 POSIX is being revised to require this. 1175 1176 When tzset and related functions set vestigial static variables 1177 like tzname, they now prefer specified timestamps to unspecified ones. 1178 (Problem reported by Almaz Mingaleev.) 1179 1180 zic no longer complains "can't determine time zone abbreviation to 1181 use just after until time" when a transition to a new standard 1182 time occurs simultaneously with the first DST fallback transition. 1183 1184 Changes to build procedure 1185 1186 Source data in vanguard form now uses the %z notation, introduced 1187 in release 2015f. For example, for America/Sao_Paulo vanguard 1188 form contains the zone continuation line "-3:00 Brazil %z", which 1189 is simpler and more reliable than the line "-3:00 Brazil -03/-02" 1190 used in main and rearguard forms. The plan is for the main form 1191 to use %z eventually; in the meantime maintainers of zi parsers 1192 are encouraged to test the parsers on vanguard.zi. 1193 1194 The Makefile has a new PACKRATLIST option to select a subset of 1195 'backzone'. For example, 'make PACKRATDATA=backzone 1196 PACKRATLIST=zone.tab' now generates TZif files identical to those 1197 of the global-tz project. 1198 1199 The Makefile has a new tailored_tarballs target for generating 1200 special-purpose tarballs. It generalizes and replaces the 1201 rearguard_tarballs target and related targets and macros, which 1202 are now obsolescent. 1203 1204 'make install' now defaults LOCALTIME to Factory not GMT, 1205 which means the default abbreviation is now "-00" not "GMT". 1206 1207 Remove the posix_packrat target, marked obsolescent in 2016a. 1208 1209 1210 Release 2022a - 2022-03-15 23:02:01 -0700 1211 1212 Briefly: 1213 Palestine will spring forward on 2022-03-27, not -03-26. 1214 zdump -v now outputs better failure indications. 1215 Bug fixes for code that reads corrupted TZif data. 1216 1217 Changes to future timestamps 1218 1219 Palestine will spring forward on 2022-03-27, not 2022-03-26. 1220 (Thanks to Heba Hamad.) Predict future transitions for first 1221 Sunday >= March 25. Additionally, predict fallbacks to be the first 1222 Friday on or after October 23, not October's last Friday, to be more 1223 consistent with recent practice. The first differing fallback 1224 prediction is on 2025-10-24, not 2025-10-31. 1225 1226 Changes to past timestamps 1227 1228 From 1992 through spring 1996, Ukraine's DST transitions were at 1229 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) 1230 1231 Chile's Santiago Mean Time and its LMT precursor have been adjusted 1232 eastward by 1 second to align with past and present law. 1233 1234 Changes to commentary 1235 1236 Add several references for Chile's 1946/1947 transitions, some of 1237 which only affected portions of the country. 1238 1239 Changes to code 1240 1241 Fix bug when mktime gets confused by truncated TZif files with 1242 unspecified local time. (Problem reported by Almaz Mingaleev.) 1243 1244 Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. 1245 (Problem reported by Christos Zoulas.) 1246 1247 When reading a version 2 or later TZif file, the TZif reader now 1248 validates the version 1 header and data block only enough to skip 1249 over them, as recommended by RFC 8536 section 4. Also, the TZif 1250 reader no longer mistakenly attempts to parse a version 1 TZIf 1251 file header as a TZ string. 1252 1253 zdump -v now outputs "(localtime failed)" and "(gmtime failed)" 1254 when local time and UT cannot be determined for a timestamp. 1255 1256 Changes to build procedure 1257 1258 Distribution tarballs now use standard POSIX.1-1988 ustar format 1259 instead of GNU format. Although the formats are almost identical 1260 for these tarballs, ustar headers' magic fields contain "ustar" 1261 instead of "ustar ", and their version fields contain "00" instead 1262 of " ". The two formats are planned to diverge more significantly 1263 for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar 1264 format becomes obsolete and the tarballs switch to pax format, an 1265 extension of ustar. For details about these formats, please see 1266 "pax - portable archive interchange", IEEE Std 1003.1-2017, 1267 <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>. 1268 1269 1270 Release 2021e - 2021-10-21 18:41:00 -0700 1271 1272 Changes to future timestamps 1273 1274 Palestine will fall back 10-29 (not 10-30) at 01:00. 1275 (Thanks to P Chan and Heba Hemad.) 1276 1277 1278 Release 2021d - 2021-10-15 13:48:18 -0700 1279 1280 Briefly: 1281 Fiji suspends DST for the 2021/2022 season. 1282 'zic -r' marks unspecified timestamps with "-00". 1283 1284 Changes to future timestamps 1285 1286 Fiji will suspend observance of DST for the 2021/2022 season. 1287 Assume for now that it will return next year. (Thanks to Jashneel 1288 Kumar and P Chan.) 1289 1290 Changes to code 1291 1292 'zic -r' now uses "-00" time zone abbreviations for intervals 1293 with UT offsets that are unspecified due to -r truncation. 1294 This implements a change in draft Internet RFC 8536bis. 1295 1296 1297 Release 2021c - 2021-10-01 14:21:49 -0700 1298 1299 Briefly: 1300 Revert most 2021b changes to 'backward'. 1301 Fix 'zic -b fat' bug in pre-1970 32-bit data. 1302 Fix two Link line typos. 1303 Distribute SECURITY file. 1304 1305 This release is intended as a bugfix release, to fix compatibility 1306 problems and typos reported since 2021b was released. 1307 1308 Changes to Link directives 1309 1310 Revert almost all of 2021b's changes to the 'backward' file, 1311 by moving Link directives back to where they were in 2021a. 1312 Although 'zic' doesn't care which source file contains a Link 1313 directive, some downstream uses ran into trouble with the move. 1314 (Problem reported by Stephen Colebourne for Joda-Time.) 1315 1316 Fix typo that linked Atlantic/Jan_Mayen to the wrong location 1317 (problem reported by Chris Walton). 1318 1319 Fix 'backzone' typo that linked America/Virgin to the wrong 1320 location (problem reported by Michael Deckers). 1321 1322 Changes to code 1323 1324 Fix a bug in 'zic -b fat' that caused old timestamps to be 1325 mishandled in 32-bit-only readers (problem reported by Daniel 1326 Fischer). 1327 1328 Changes to documentation 1329 1330 Distribute the SECURITY file (problem reported by Andreas Radke). 1331 1332 1333 Release 2021b - 2021-09-24 16:23:00 -0700 1334 1335 Briefly: 1336 Jordan now starts DST on February's last Thursday. 1337 Samoa no longer observes DST. 1338 Merge more location-based Zones whose timestamps agree since 1970. 1339 Move some backward-compatibility links to 'backward'. 1340 Rename Pacific/Enderbury to Pacific/Kanton. 1341 Correct many pre-1993 transitions in Malawi, Portugal, etc. 1342 zic now creates each output file or link atomically. 1343 zic -L no longer omits the POSIX TZ string in its output. 1344 zic fixes for truncation and leap second table expiration. 1345 zic now follows POSIX for TZ strings using all-year DST. 1346 Fix some localtime crashes and bugs in obscure cases. 1347 zdump -v now outputs more-useful boundary cases. 1348 tzfile.5 better matches a draft successor to RFC 8536. 1349 A new file SECURITY. 1350 1351 This release is prompted by recent announcements by Jordan and Samoa. 1352 It incorporates many other changes that had accumulated since 2021a. 1353 However, it omits most proposed changes that merged all Zones 1354 agreeing since 1970, as concerns were raised about doing too many of 1355 these changes at once. It does keeps some of these changes in the 1356 interest of making tzdb more equitable one step at a time; see 1357 "Merge more location-based Zones" below. 1358 1359 Changes to future timestamps 1360 1361 Jordan now starts DST on February's last Thursday. 1362 (Thanks to Steffen Thorsen.) 1363 1364 Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) 1365 1366 Changes to zone name 1367 1368 Rename Pacific/Enderbury to Pacific/Kanton. When we added 1369 Enderbury in 1993, we did not know that it is uninhabited and that 1370 Kanton (population two dozen) is the only inhabited location in 1371 that timezone. The old name is now a backward-compatibility link. 1372 1373 Changes to past timestamps 1374 1375 Correct many pre-1993 transitions, fixing entries originally 1376 derived from Shanks, Whitman, and Mundell. The fixes include: 1377 - Barbados: standard time was introduced in 1911, not 1932; and 1378 DST was observed in 1942-1944 1379 - Cook Islands: In 1899 they switched from east to west of GMT, 1380 celebrating Christmas for two days. They (and Niue) switched 1381 to standard time in 1952, not 1901. 1382 - Guyana: corrected LMT for Georgetown; the introduction of 1383 standard time in 1911, not 1915; and corrections to 1975 and 1384 1992 transitions 1385 - Kanton: uninhabited before 1937-08-31 1386 - Niue: only observed -11:20 from 1952 through 1964, then went to 1387 -11 instead of -11:30 1388 - Portugal: DST was observed in 1950 1389 - Tonga: corrected LMT; the introduction of standard time in 1945, 1390 not 1901; and corrections to the transition from +12:20 to +13 1391 in 1961, not 1941 1392 Additional fixes to entries in the 'backzone' file include: 1393 - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 1394 - The Gambia: 1933 and 1942 transitions 1395 - Malawi: several 1911 through 1925 transitions 1396 - Sierra Leone: several 1913 through 1941 transitions, and DST 1397 was NOT observed in 1957 through 1962 1398 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and 1399 Alois Treindl.) 1400 1401 Merge more location-based Zones whose timestamps agree since 1970, 1402 as pre-1970 timestamps are out of scope. This is part of a 1403 process that has been ongoing since 2013. This does not affect 1404 post-1970 timestamps, and timezone historians who build with 'make 1405 PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. 1406 When merging, keep the most-populous location's data, and move 1407 data for other locations to 'backzone' with a backward 1408 link in 'backward'. For example, move America/Creston data to 1409 'backzone' with a link in 'backward' from America/Phoenix because 1410 the two timezones' timestamps agree since 1970; this change 1411 affects some pre-1968 timestamps in America/Creston because 1412 Creston and Phoenix disagreed before 1968. The affected Zones 1413 are Africa/Accra, America/Atikokan, America/Blanc-Sablon, 1414 America/Creston, America/Curacao, America/Nassau, 1415 America/Port_of_Spain, Antarctica/DumontDUrville, and 1416 Antarctica/Syowa. 1417 1418 Changes to maintenance procedure 1419 1420 The new file SECURITY covers how to report security-related bugs. 1421 1422 Several backward-compatibility links have been moved to the 1423 'backward' file. These links, which range from Africa/Addis_Ababa 1424 to Pacific/Saipan, are only for compatibility with now-obsolete 1425 guidelines suggesting an entry for every ISO 3166 code. 1426 The intercontinental convenience links Asia/Istanbul and 1427 Europe/Nicosia have also been moved to 'backward'. 1428 1429 Changes to code 1430 1431 zic now creates each output file or link atomically, 1432 possibly by creating a temporary file and then renaming it. 1433 This avoids races where a TZ setting would temporarily stop 1434 working while zic was installing a replacement file or link. 1435 1436 zic -L no longer omits the POSIX TZ string in its output. 1437 Starting with 2020a, zic -L truncated its output according to the 1438 "Expires" directive or "#expires" comment in the leapseconds file. 1439 The resulting TZif files omitted daylight saving transitions after 1440 the leap second table expired, which led to far less accurate 1441 predictions of times after the expiry. Although future timestamps 1442 cannot be converted accurately in the presence of leap seconds, it 1443 is more accurate to convert near-future timestamps with a few 1444 seconds error than with an hour error, so zic -L no longer 1445 truncates output in this way. 1446 1447 Instead, when zic -L is given the "Expires" directive, it now 1448 outputs the expiration by appending a no-change entry to the leap 1449 second table. Although this should work well with most TZif 1450 readers, it does not conform to Internet RFC 8536 and some pickier 1451 clients (including tzdb 2017c through 2021a) reject it, so 1452 "Expires" directives are currently disabled by default. To enable 1453 them, set the EXPIRES_LINE Makefile variable. If a TZif file uses 1454 this new feature it is marked with a new TZif version number 4, 1455 a format intended to be documented in a successor to RFC 8536. 1456 The old-format "#expires" comments are now treated solely as 1457 comments and have no effect on the TZif files. 1458 1459 zic -L LEAPFILE -r @LO no longer generates an invalid TZif file 1460 that omits leap second information for the range LO..B when LO 1461 falls between two leap seconds A and B. Instead, it generates a 1462 TZif version 4 file that represents the previously missing 1463 information. 1464 1465 The TZif reader now allows the leap second table to begin with a 1466 correction other than -1 or +1, and to contain adjacent 1467 transitions with equal corrections. This supports TZif version 4. 1468 1469 The TZif reader now lets leap seconds occur less than 28 days 1470 apart. This supports possible future TZif extensions. 1471 1472 Fix bug that caused 'localtime' etc. to crash when TZ was 1473 set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does 1474 not conform to POSIX but does conform to Internet RFC 8536. 1475 1476 Fix another bug that caused 'localtime' etc. to crash when TZ was 1477 set to a POSIX-conforming but unusual TZ string like 1478 "EST5EDT4,0/0,J365/0", where almost all the year is DST. 1479 1480 Fix yet another bug that caused 'localtime' etc. to mishandle slim 1481 TZif files containing leap seconds after the last explicit 1482 transition in the table, or when handling far-future timestamps 1483 in slim TZif files lacking leap seconds. 1484 1485 Fix localtime misbehavior involving positive leap seconds. 1486 This change affects only behavior for "right" system time, 1487 which contains leap seconds, and only if the UT offset is 1488 not a multiple of 60 seconds when a positive leap second occurs. 1489 (No such timezone exists in tzdb, luckily.) Without the fix, 1490 the timestamp was ambiguous during a positive leap second. 1491 With the fix, any seconds occurring after a positive leap second 1492 and within the same localtime minute are counted through 60, not 1493 through 59; their UT offset (tm_gmtoff) is the same as before. 1494 Here is how the fix affects timestamps in a timezone with UT 1495 offset +01:23:45 (5025 seconds) and with a positive leap second at 1496 1972-06-30 23:59:60 UTC (78796800): 1497 1498 time_t without the fix with the fix 1499 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 1500 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 1501 ... 1502 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 1503 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 1504 1505 Fix an unlikely bug that caused 'localtime' etc. to misbehave if 1506 civil time changes a few seconds before time_t wraps around, when 1507 leap seconds are enabled. 1508 1509 Fix bug in zic -r; in some cases, the dummy time type after the 1510 last time transition disagreed with the TZ string, contrary to 1511 Internet RFC 8563 section 3.3. 1512 1513 Fix a bug with 'zic -r @X' when X is a negative leap second that 1514 has a nonnegative correction. Without the fix, the output file 1515 was truncated so that X appeared to be a positive leap second. 1516 Fix a similar, even less likely bug when truncating at a positive 1517 leap second that has a nonpositive correction. 1518 1519 zic -r now reports an error if given rolling leap seconds, as this 1520 usage has never generally worked and is evidently unused. 1521 1522 zic now generates a POSIX-conforming TZ string for TZif files 1523 where all-year DST is predicted for the indefinite future. 1524 For example, for all-year Eastern Daylight Time, zic now generates 1525 "XXX3EDT4,0/0,J365/23" where it previously generated 1526 "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for 1527 noting the possibility of POSIX conformance.) 1528 1529 zic.c no longer requires sys/wait.h (thanks to spazmodius for 1530 noting it wasn't needed). 1531 1532 When reading slim TZif files, zdump no longer mishandles leap 1533 seconds on the rare platforms where time_t counts leap seconds, 1534 fixing a bug introduced in 2014g. 1535 1536 zdump -v now outputs timestamps at boundaries of what localtime 1537 and gmtime can represent, instead of the less useful timestamps 1538 one day after the minimum and one day before the maximum. 1539 (Thanks to Arthur David Olson for prototype code, and to Manuela 1540 Friedrich for debugging help.) 1541 1542 zdump's -c and -t options are now consistently inclusive for the 1543 lower time bound and exclusive for the upper. Formerly they were 1544 inconsistent. (Confusion noted by Martin Burnicki.) 1545 1546 Changes to build procedure 1547 1548 You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to 1549 non-POSIX hosts where malloc doesn't set errno. 1550 (Problem reported by Jan Engelhardt.) 1551 1552 Changes to documentation 1553 1554 tzfile.5 better matches a draft successor to RFC 8536 1555 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>. 1556 1557 1558 Release 2021a - 2021-01-24 10:54:57 -0800 1559 1560 Changes to future timestamps 1561 1562 South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. 1563 (Thanks to Steffen Thorsen.) 1564 1565 1566 Release 2020f - 2020-12-29 00:17:46 -0800 1567 1568 Change to build procedure 1569 1570 'make rearguard_tarballs' no longer generates a bad rearguard.zi, 1571 fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) 1572 1573 1574 Release 2020e - 2020-12-22 15:14:34 -0800 1575 1576 Briefly: 1577 Volgograd switches to Moscow time on 2020-12-27 at 02:00. 1578 1579 Changes to future timestamps 1580 1581 Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. 1582 (Thanks to Alexander Krivenyshev and Stepan Golosunov.) 1583 1584 Changes to past timestamps 1585 1586 Correct many pre-1986 transitions, fixing entries originally 1587 derived from Shanks. The fixes include: 1588 - Australia: several 1917 through 1971 transitions 1589 - The Bahamas: several 1941 through 1945 transitions 1590 - Bermuda: several 1917 through 1956 transitions 1591 - Belize: several 1942 through 1968 transitions 1592 - Ghana: several 1915 through 1956 transitions 1593 - Israel and Palestine: several 1940 through 1985 transitions 1594 - Kenya and adjacent: several 1908 through 1960 transitions 1595 - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 1596 through 1919 transitions 1597 - Seychelles: the introduction of standard time in 1907, not 1906 1598 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition 1599 (Thanks to P Chan.) 1600 1601 Because of the Australia change, Australia/Currie (King Island) is 1602 no longer needed, as it is identical to Australia/Hobart for all 1603 timestamps since 1970 and was therefore created by mistake. 1604 Australia/Currie has been moved to the 'backward' file and its 1605 corrected data moved to the 'backzone' file. 1606 1607 Changes to past time zone abbreviations and DST flags 1608 1609 To better match legislation in Turks and Caicos, the 2015 shift to 1610 year-round observance of -04 is now modeled as AST throughout before 1611 returning to Eastern Time with US DST in 2018, rather than as 1612 maintaining EDT until 2015-11-01. (Thanks to P Chan.) 1613 1614 Changes to documentation 1615 1616 The zic man page now documents zic's coalescing of transitions 1617 when a zone falls back just before DST springs forward. 1618 1619 1620 Release 2020d - 2020-10-21 11:24:13 -0700 1621 1622 Briefly: 1623 Palestine ends DST earlier than predicted, on 2020-10-24. 1624 1625 Changes to past and future timestamps 1626 1627 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 1628 as previously predicted (thanks to Sharef Mustafa.) Its 1629 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen 1630 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and 1631 its spring 2020 transition was on March 28 at 00:00, not March 27 1632 (thanks to Pierre Cashon.) This affects Asia/Gaza and 1633 Asia/Hebron. Assume future spring and fall transitions will be on 1634 the Saturday preceding the last Sunday of March and October, 1635 respectively. 1636 1637 1638 Release 2020c - 2020-10-16 11:15:53 -0700 1639 1640 Briefly: 1641 Fiji starts DST later than usual, on 2020-12-20. 1642 1643 Changes to future timestamps 1644 1645 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as 1646 previously predicted. DST will still end on 2021-01-17. 1647 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that 1648 the later-than-usual start date is a one-time departure from the 1649 recent pattern. 1650 1651 Changes to build procedure 1652 1653 Rearguard tarballs now contain an empty file pacificnew. 1654 Some older downstream software expects this file to exist. 1655 (Problem reported by Mike Cullinan.) 1656 1657 1658 Release 2020b - 2020-10-06 18:35:04 -0700 1659 1660 Briefly: 1661 Revised predictions for Morocco's changes starting in 2023. 1662 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. 1663 Macquarie Island has stayed in sync with Tasmania since 2011. 1664 Casey, Antarctica is at +08 in winter and +11 in summer. 1665 zic no longer supports -y, nor the TYPE field of Rules. 1666 1667 Changes to future timestamps 1668 1669 Morocco's spring-forward after Ramadan is now predicted to occur 1670 no sooner than two days after Ramadan, instead of one day. 1671 (Thanks to Milamber.) The first altered prediction is for 2023, 1672 now predicted to spring-forward on April 30 instead of April 23. 1673 1674 Changes to past and future timestamps 1675 1676 Casey Station, Antarctica has been using +08 in winter and +11 in 1677 summer since 2018. The most recent transition from +08 to +11 was 1678 2020-10-04 00:01. Also, Macquarie Island has been staying in 1679 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) 1680 1681 Changes to past and future time zone abbreviations and DST flags 1682 1683 Canada's Yukon, represented by America/Whitehorse and 1684 America/Dawson, changes its time zone rules from -08/-07 to 1685 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. 1686 This change affects only the time zone abbreviation (MST vs PDT) 1687 and daylight saving flag for the period between the two dates. 1688 (Thanks to Andrew G. Smith.) 1689 1690 Changes to past timestamps 1691 1692 Correct several transitions for Hungary for 1918/1983. 1693 For example, the 1983-09-25 fall-back was at 01:00, not 03:00. 1694 (Thanks to Gza Nyry.) Also, the 1890 transition to standard 1695 time was on 11-01, not 10-01 (thanks to Michael Deckers). 1696 1697 The 1891 French transition was on March 16, not March 15. The 1698 1911-03-11 French transition was at midnight, not a minute later. 1699 Monaco's transitions were on 1892-06-01 and 1911-03-29, not 1700 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) 1701 1702 Changes to code 1703 1704 Support for zic's long-obsolete '-y YEARISTYPE' option has been 1705 removed and, with it, so has support for the TYPE field in Rule 1706 lines, which is now reserved for compatibility with earlier zic. 1707 These features were previously deprecated in release 2015f. 1708 (Thanks to Tim Parenti.) 1709 1710 zic now defaults to '-b slim' instead of to '-b fat'. 1711 1712 zic's new '-l -' and '-p -' options uninstall any existing 1713 localtime and posixrules files, respectively. 1714 1715 The undocumented and ineffective tzsetwall function has been 1716 removed. 1717 1718 Changes to build procedure 1719 1720 The Makefile now defaults POSIXRULES to '-', so the posixrules 1721 feature (obsolete as of 2019b) is no longer installed by default. 1722 1723 Changes to documentation and commentary 1724 1725 The long-obsolete files pacificnew, systemv, and yearistype.sh have 1726 been removed from the distribution. (Thanks to Tim Parenti.) 1727 1728 1729 Release 2020a - 2020-04-23 16:03:47 -0700 1730 1731 Briefly: 1732 Morocco springs forward on 2020-05-31, not 2020-05-24. 1733 Canada's Yukon advanced to -07 year-round on 2020-03-08. 1734 America/Nuuk renamed from America/Godthab. 1735 zic now supports expiration dates for leap second lists. 1736 1737 Changes to future timestamps 1738 1739 Morocco's second spring-forward transition in 2020 will be May 31, 1740 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) 1741 Adjust future-year predictions to use the first Sunday after the 1742 day after Ramadan, not the first Sunday after Ramadan. 1743 1744 Canada's Yukon, represented by America/Whitehorse and 1745 America/Dawson, advanced to -07 year-round, beginning with its 1746 spring-forward transition on 2020-03-08, and will not fall back on 1747 2020-11-01. Although a government press release calls this 1748 "permanent Pacific Daylight Saving Time", we prefer MST for 1749 consistency with nearby Dawson Creek, Creston, and Fort Nelson. 1750 (Thanks to Tim Parenti.) 1751 1752 Changes to past timestamps 1753 1754 Shanghai observed DST in 1919. (Thanks to Phake Nick.) 1755 1756 Changes to timezone identifiers 1757 1758 To reflect current usage in English better, America/Godthab has 1759 been renamed to America/Nuuk. A backwards-compatibility link 1760 remains for the old name. 1761 1762 Changes to code 1763 1764 localtime.c no longer mishandles timestamps after the last 1765 transition in a TZif file with leap seconds and with daylight 1766 saving time transitions projected into the indefinite future. 1767 For example, with TZ='America/Los_Angeles' with leap seconds, 1768 zdump formerly reported a DST transition on 2038-03-14 1769 from 01:59:32.999... to 02:59:33 instead of the correct transition 1770 from 01:59:59.999... to 03:00:00. 1771 1772 zic -L now supports an Expires line in the leapseconds file, and 1773 truncates the TZif output accordingly. This propagates leap 1774 second expiration information into the TZif file, and avoids the 1775 localtime.c bug mentioned above, as well as similar bugs present in 1776 many client implementations. If no Expires line is present, zic 1777 -L instead truncates the TZif output based on the #expires comment 1778 present in leapseconds files distributed by tzdb 2018f and later; 1779 however, this usage is obsolescent. For now, the distributed 1780 leapseconds file has an Expires line that is commented out, so 1781 that the file can be fed to older versions of zic which ignore the 1782 commented-out line. Future tzdb distributions are planned to 1783 contain a leapseconds file with an Expires line. 1784 1785 The configuration macros HAVE_TZNAME and USG_COMPAT should now be 1786 set to 1 if the system library supports the feature, and 2 if not. 1787 As before, these macros are nonzero if tzcode should support the 1788 feature, zero otherwise. 1789 1790 The configuration macro ALTZONE now has the same values with the 1791 same meaning as HAVE_TZNAME and USG_COMPAT. 1792 1793 The code's defense against CRLF in leap-seconds.list is now 1794 portable to POSIX awk. (Problem reported by Deborah Goldsmith.) 1795 1796 Although the undocumented tzsetwall function is not changed in 1797 this release, it is now deprecated in preparation for removal in 1798 future releases. Due to POSIX requirements, tzsetwall has not 1799 worked for some time. Any code that uses it should instead use 1800 tzalloc(NULL) or, if portability trumps thread-safety, should 1801 unset the TZ environment variable. 1802 1803 Changes to commentary 1804 1805 The les-de-la-Madeleine and the Listuguj reserve are noted as 1806 following America/Halifax, and comments about Yukon's "south" and 1807 "north" have been corrected to say "east" and "west". (Thanks to 1808 Jeffery Nichols.) 1809 1810 1811 Release 2019c - 2019-09-11 08:59:48 -0700 1812 1813 Briefly: 1814 Fiji observes DST from 2019-11-10 to 2020-01-12. 1815 Norfolk Island starts observing Australian-style DST. 1816 1817 Changes to future timestamps 1818 1819 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 1820 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) 1821 Adjust future guesses accordingly. 1822 1823 Norfolk Island will observe Australian-style DST starting in 1824 spring 2019. The first transition is on 2019-10-06. (Thanks to 1825 Kyle Czech and Michael Deckers.) 1826 1827 Changes to past timestamps 1828 1829 Many corrections to time in Turkey from 1940 through 1985. 1830 (Thanks to Oya Vula via Alois Treindl, and to Kvan Yazan.) 1831 1832 The Norfolk Island 1975-03-02 transition was at 02:00 standard 1833 time, not 02:00 DST. (Thanks to Michael Deckers.) 1834 1835 South Korea observed DST from 1948 through 1951. Although this 1836 info was supposed to appear in release 2014j, a typo inadvertently 1837 suppressed the change. (Thanks to Alois Treindl.) 1838 1839 Detroit observed DST in 1967 and 1968 following the US DST rules, 1840 except that its 1967 DST began on June 14 at 00:01. (Thanks to 1841 Alois Treindl for pointing out that the old data entries were 1842 probably wrong.) 1843 1844 Fix several errors in pre-1970 transitions in Perry County, IN. 1845 (Thanks to Alois Treindl for pointing out the 1967/9 errors.) 1846 1847 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver 1848 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 1849 10-06. In 1945 Knigsberg (now Kaliningrad) switched from +01/+02 1850 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated 1851 EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 1852 Knigsberg switched to +03 on 04-07 not 01-01. 1853 1854 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 1855 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) 1856 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. 1857 1858 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. 1859 (Thanks to Michael Deckers.) 1860 1861 Changes to past time zone abbreviations and DST flags 1862 1863 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, 1864 is now flagged as DST and is abbreviated HKWT not HKT. 1865 1866 Changes to code 1867 1868 leapseconds.awk now relies only on its input data, rather than 1869 also relying on its comments. (Inspired by code from Dennis 1870 Ferguson and Chris Woodbury.) 1871 1872 The code now defends against CRLFs in leap-seconds.list. 1873 (Thanks to Brian Inglis and Chris Woodbury.) 1874 1875 Changes to documentation and commentary 1876 1877 theory.html discusses leap seconds. (Thanks to Steve Summit.) 1878 1879 Nashville's newspapers dueled about the time of day in the 1950s. 1880 (Thanks to John Seigenthaler.) 1881 1882 Liechtenstein observed Swiss DST in 1941/2. 1883 (Thanks to Alois Treindl.) 1884 1885 1886 Release 2019b - 2019-07-01 00:09:53 -0700 1887 1888 Briefly: 1889 Brazil no longer observes DST. 1890 'zic -b slim' outputs smaller TZif files; please try it out. 1891 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 1892 1893 Changes to future timestamps 1894 1895 Brazil has canceled DST and will stay on standard time indefinitely. 1896 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 1897 Oliveira.) 1898 1899 Predictions for Morocco now go through 2087 instead of 2037, to 1900 work around a problem on newlib when using TZif files output by 1901 zic 2019a or earlier. (Problem reported by David Gauchard.) 1902 1903 Changes to past and future timestamps 1904 1905 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 1906 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 1907 future transitions to be March's last Friday at 00:00. 1908 1909 Changes to past timestamps 1910 1911 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 1912 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 1913 not 09-15 at 00:00. In 1946 its spring-forward transition was on 1914 04-21 at 00:00, not the previous day at 03:30. From 1946 through 1915 1952 its fall-back transitions occurred at 04:30, not at 03:30. 1916 In 1947 its fall-back transition was on 11-30, not 12-30. 1917 (Thanks to P Chan.) 1918 1919 Changes to past time zone abbreviations 1920 1921 Italy's 1866 transition to Rome Mean Time was on December 12, not 1922 September 22. This affects only the time zone abbreviation for 1923 Europe/Rome between those dates. (Thanks to Stephen Trainor and 1924 Luigi Rosa.) 1925 1926 Changes affecting metadata only 1927 1928 Add info about the Crimea situation in zone1970.tab and zone.tab. 1929 (Problem reported by Serhii Demediuk.) 1930 1931 Changes to code 1932 1933 zic's new -b option supports a way to control data bloat and to 1934 test for year-2038 bugs in software that reads TZif files. 1935 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 1936 for example, changing from fat to slim shrinks the Europe/London 1937 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 1938 files represent the same set of timestamps and use the same TZif 1939 format as documented in tzfile(5) and in Internet RFC 8536. 1940 Fat format attempts to work around bugs or incompatibilities in 1941 older software, notably software that mishandles 64-bit TZif data 1942 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 1943 Slim format is more efficient and does not work around 64-bit bugs 1944 or obsolete TZ strings. Currently zic defaults to fat format 1945 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 1946 out-of-the-box default is intended to change in future releases 1947 as the buggy software often mishandles timestamps anyway. 1948 1949 zic no longer treats a set of rules ending in 2037 specially. 1950 Previously, zic assumed that such a ruleset meant that future 1951 timestamps could not be predicted, and therefore omitted a 1952 POSIX-like TZ string in the TZif output. The old behavior is no 1953 longer needed for current tzdata, and caused problems with newlib 1954 when used with older tzdata (reported by David Gauchard). 1955 1956 zic no longer generates some artifact transitions. For example, 1957 Europe/London no longer has a no-op transition in January 1996. 1958 1959 Changes to build procedure 1960 1961 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 1962 by a percent or so. 1963 1964 Changes to documentation and commentary 1965 1966 The Makefile now documents the POSIXRULES macro as being obsolete, 1967 and similarly, zic's -p POSIXRULES option is now documented as 1968 being obsolete. Although the POSIXRULES feature still exists and 1969 works as before, in practice it is rarely used for its intended 1970 purpose, and it does not work either in the default reference 1971 implementation (for timestamps after 2037) or in common 1972 implementations such as GNU/Linux (for contemporary timestamps). 1973 Since POSIXRULES was designed primarily as a temporary transition 1974 facility for System V platforms that died off decades ago, it is 1975 being decommissioned rather than institutionalized. 1976 1977 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 1978 1979 1980 Release 2019a - 2019-03-25 22:01:33 -0700 1981 1982 Briefly: 1983 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 1984 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 1985 1986 Changes to past and future timestamps 1987 1988 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 1989 previously predicted. Adjust our prediction by guessing that spring 1990 transitions will be between 24 and 30 March, which matches recent practice 1991 since 2016. (Thanks to Even Scharning and Tim Parenti.) 1992 1993 Metlakatla ended its observance of Pacific standard time, 1994 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 1995 Stanley and Tim Parenti.) 1996 1997 Changes to past timestamps 1998 1999 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 2000 (Thanks to Alois Treindl and Isaac Starkman.) 2001 2002 Changes to time zone abbreviations 2003 2004 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 2005 of being a separate zone that generates the abbreviation "UCT", 2006 which nowadays is typically a typo. (Problem reported by Isiah 2007 Meadows.) 2008 2009 Changes to code 2010 2011 zic now has an -r option to limit the time range of output data. 2012 For example, 'zic -r @1000000000' limits the output data to 2013 timestamps starting 1000000000 seconds after the Epoch. 2014 This helps shrink output size and can be useful for applications 2015 not needing the full timestamp history, such as TZDIST truncation; 2016 see Internet RFC 8536 section 5.1. (Inspired by a feature request 2017 from Christopher Wong, helped along by bug reports from Wong and 2018 from Tim Parenti.) 2019 2020 Changes to documentation 2021 2022 Mention Internet RFC 8536 (February 2019), which documents TZif. 2023 2024 tz-link.html now cites tzdata-meta 2025 <https://tzdata-meta.timtimeonline.com/>. 2026 2027 2028 Release 2018i - 2018-12-30 11:05:43 -0800 2029 2030 Briefly: 2031 So Tom and Prncipe switches from +01 to +00 on 2019-01-01. 2032 2033 Changes to future timestamps 2034 2035 Due to a change in government, So Tom and Prncipe switches back 2036 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 2037 Nasardinov and Michael Deckers.) 2038 2039 2040 Release 2018h - 2018-12-23 17:59:32 -0800 2041 2042 Briefly: 2043 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 2044 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 2045 Metlakatla, Alaska observes PST this winter only. 2046 Guess Morocco will continue to adjust clocks around Ramadan. 2047 Add predictions for Iran from 2038 through 2090. 2048 2049 Changes to future timestamps 2050 2051 Guess that Morocco will continue to fall back just before and 2052 spring forward just after Ramadan, the practice since 2012. 2053 (Thanks to Maamar Abdelkader.) This means Morocco will observe 2054 negative DST during Ramadan in main and vanguard formats, and in 2055 rearguard format it stays in the +00 timezone and observes 2056 ordinary DST in all months other than Ramadan. As before, extend 2057 this guesswork to the year 2037. As a consequence, Morocco is 2058 scheduled to observe three DST transitions in some Gregorian years 2059 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 2060 calendars. 2061 2062 The table of exact transitions for Iranian DST has been extended. 2063 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 2064 It now cuts off before 2091 as there is doubt about how the Persian 2065 calendar will treat 2091. This change predicts DST transitions in 2066 2038-9, 2042-3, and 2046-7 to occur one day later than previously 2067 predicted. As before, post-cutoff transitions are approximated. 2068 2069 Changes to past and future timestamps 2070 2071 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 2072 +05 on 2018-12-21. This is a zone split as Qostanay (aka 2073 Kostanay) did not switch, so create a zone Asia/Qostanay. 2074 2075 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 2076 It did not change clocks that day and remains on -08 this winter. 2077 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 2078 rules next spring, so this change affects only timestamps 2079 from 2018-11-04 through 2019-03-10. 2080 2081 Change to past timestamps 2082 2083 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 2084 not 00:00. I transcribed the time incorrectly from Shanks. 2085 (Thanks to Phake Nick.) 2086 2087 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 2088 (Thanks to Phake Nick.) 2089 2090 Guam observed DST irregularly from 1959 through 1977. 2091 (Thanks to Phake Nick.) 2092 2093 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 2094 10-01 changed standard time to +08:30 (not +08). Its transition 2095 back to +08 after WWII was on 1945-09-15, not the previous day. 2096 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 2097 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 2098 its 1952 fallback was on 11-02 (not 10-25). 2099 2100 This release contains many changes to timestamps before 1946 due 2101 to Japanese possession or occupation of Pacific/Chuuk, 2102 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 2103 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 2104 (Thanks to Phake Nick.) 2105 2106 Assume that the Spanish East Indies was like the Philippines and 2107 observed American time until the end of 1844. This affects 2108 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 2109 2110 Changes to past tm_isdst flags 2111 2112 For the recent Morocco change, the tm_isdst flag should be 1 from 2113 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 2114 Give a URL to the official decree. (Thanks to Matt Johnson.) 2115 2116 2117 Release 2018g - 2018-10-26 22:22:45 -0700 2118 2119 Briefly: 2120 Morocco switches to permanent +01 on 2018-10-28. 2121 2122 Changes to future timestamps 2123 2124 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 2125 so its clocks will not fall back as previously scheduled. 2126 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 2127 2128 Changes to code 2129 2130 When generating TZif files with leap seconds, zic no longer uses a 2131 format that trips up older 32-bit clients, fixing a bug introduced 2132 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 2133 for QTBUG-53071 now also works for TZif files with leap seconds. 2134 2135 The translator to rearguard format now rewrites the line 2136 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 2137 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 2138 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 2139 and earlier. (Reported by Christos Zoulas.) 2140 2141 Changes to past time zone abbreviations 2142 2143 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 2144 This reverts to 2011h, as the abbreviation change in 2011i was 2145 likely inadvertent. 2146 2147 Changes to documentation 2148 2149 tzfile.5 has new sections on interoperability issues. 2150 2151 2152 Release 2018f - 2018-10-18 00:14:18 -0700 2153 2154 Briefly: 2155 Volgograd moves from +03 to +04 on 2018-10-28. 2156 Fiji ends DST 2019-01-13, not 2019-01-20. 2157 Most of Chile changes DST dates, effective 2019-04-06. 2158 2159 Changes to future timestamps 2160 2161 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 2162 (Thanks to Alexander Fetisov and Stepan Golosunov.) 2163 2164 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 2165 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 2166 accordingly. 2167 2168 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 2169 time, and resume DST on the first Saturday in September at 24:00 mainland 2170 time. The changes are effective from 2019-04-06, and do not affect the 2171 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 2172 and Tim Parenti.) Adjust future predictions accordingly. 2173 2174 Changes to past timestamps 2175 2176 The 2018-05-05 North Korea 30-minute time zone change took place 2177 at 23:30 the previous day, not at 00:00 that day. 2178 2179 China's 1988 spring-forward transition was on April 17, not 2180 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 2181 (Thanks to P Chan.) 2182 2183 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 2184 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 2185 temporarily switched to +09/+10 during World War II. Macau 2186 observed DST in 1942/79, not 1961/80, and there were several 2187 errors for transition times and dates. (Thanks to P Chan.) 2188 2189 The 1948-1951 fallback transitions in Japan were at 25:00 on 2190 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 2191 zic turns this into 01:00 on the day after September's second 2192 Saturday, which is the best that POSIX or C platforms can do. 2193 2194 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 2195 paper by Li Yu, replacing more-questionable data from Shanks. 2196 2197 Changes to time zone abbreviations 2198 2199 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 2200 2201 Changes to code 2202 2203 zic now always generates TZif files where time type 0 is used for 2204 timestamps before the first transition. This simplifies the 2205 reading of TZif files and should not affect behavior of existing 2206 TZif readers because the same set of time types is used; only 2207 their internal indexes may have changed. This affects only the 2208 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 2209 EET, which previously used nonzero types for these timestamps. 2210 2211 Because of the type 0 change, zic no longer outputs a dummy 2212 transition at time -2**59 (before the Big Bang), as clients should 2213 no longer need this to handle historical timestamps correctly. 2214 This reverts a change introduced in 2013d and shrinks most TZif 2215 files by a few bytes. 2216 2217 zic now supports negative time-of-day in Rule and Leap lines, e.g., 2218 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 2219 occurs at 18:00 on the Saturday before the last Sunday in April. 2220 This behavior was documented in 2018a but the code did not 2221 entirely match the documentation. 2222 2223 localtime.c no longer requires at least one time type in TZif 2224 files that lack transitions or have a POSIX-style TZ string. This 2225 future-proofs the code against possible future extensions to the 2226 format that would allow TZif files with POSIX-style TZ strings and 2227 without transitions or time types. 2228 2229 A read-access subscript error in localtime.c has been fixed. 2230 It could occur only in TZif files with timecnt == 0, something that 2231 does not happen in practice now but could happen in future versions. 2232 2233 localtime.c no longer ignores TZif POSIX-style TZ strings that 2234 specify only standard time. Instead, these TZ strings now 2235 override the default time type for timestamps after the last 2236 transition (or for all timestamps if there are no transitions), 2237 just as DST strings specifying DST have always done. 2238 2239 leapseconds.awk now outputs "#updated" and "#expires" comments, 2240 and supports leap seconds at the ends of months other than June 2241 and December. (Inspired by suggestions from Chris Woodbury.) 2242 2243 Changes to documentation 2244 2245 New restrictions: A Rule name must start with a character that 2246 is neither an ASCII digit nor "-" nor "+", and an unquoted name 2247 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 2248 The latter restriction makes room for future extensions (a 2249 possibility noted by Tom Lane). 2250 2251 tzfile.5 now documents what time types apply before the first and 2252 after the last transition, if any. 2253 2254 Documentation now uses the spelling "timezone" for a TZ setting 2255 that determines timestamp history, and "time zone" for a 2256 geographic region currently sharing the same standard time. 2257 2258 The name "TZif" is now used for the tz binary data format. 2259 2260 tz-link.htm now mentions the A0 TimeZone Migration utilities. 2261 (Thanks to Aldrin Martoq for the link.) 2262 2263 Changes to build procedure 2264 2265 New 'make' target 'rearguard_tarballs' to build the rearguard 2266 tarball only. This is a convenience on platforms that lack lzip 2267 if you want to build the rearguard tarball. (Problem reported by 2268 Deborah Goldsmith.) 2269 2270 tzdata.zi is now more stable from release to release. (Problem 2271 noted by Tom Lane.) It is also a bit shorter. 2272 2273 tzdata.zi now can contain comment lines documenting configuration 2274 information, such as which data format was selected, which input 2275 files were used, and how leap seconds are treated. (Problems 2276 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 2277 are used these comment lines are absent, for backward 2278 compatibility. A redistributor intending to alter its copy of the 2279 files should also append "-LABEL" to the 'version' file's first 2280 line, where "LABEL" identifies the redistributor's change. 2281 2282 2283 Release 2018e - 2018-05-01 23:42:51 -0700 2284 2285 Briefly: 2286 2287 North Korea switches back to +09 on 2018-05-05. 2288 The main format uses negative DST again, for Ireland etc. 2289 'make tarballs' now also builds a rearguard tarball. 2290 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 2291 2292 Changes to past and future timestamps 2293 2294 North Korea switches back from +0830 to +09 on 2018-05-05. 2295 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 2296 and Tim Parenti.) 2297 2298 Bring back the negative-DST changes of 2018a, except be more 2299 compatible with data parsers that do not support negative DST. 2300 Also, this now affects historical timestamps in Namibia and the 2301 former Czechoslovakia, not just Ireland. The main format now uses 2302 negative DST to model timestamps in Europe/Dublin (from 1971 on), 2303 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 2304 does not affect UT offsets, only time zone abbreviations and the 2305 tm_isdst flag. Also, this does not affect rearguard or vanguard 2306 formats; effectively the main format now uses vanguard instead of 2307 rearguard format. Data parsers that do not support negative DST 2308 can still use data from the rearguard tarball described below. 2309 2310 Changes to build procedure 2311 2312 The command 'make tarballs' now also builds the tarball 2313 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 2314 except that it uses rearguard format intended for trailing-edge 2315 data parsers. 2316 2317 Changes to data format and to code 2318 2319 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 2320 suffix, which specifies whether the adjusted time is standard time 2321 or daylight saving time. If no suffix is given, daylight saving 2322 time is used if and only if the SAVE column is nonzero; this is 2323 the longstanding behavior. Although this new feature is not used 2324 in tzdata, it could be used to specify the legal time in Namibia 2325 1994-2017, as opposed to the popular time (see below). 2326 2327 Changes to past timestamps 2328 2329 From 1994 through 2017 Namibia observed DST in winter, not summer. 2330 That is, it used negative DST, as Ireland still does. This change 2331 does not affect UTC offsets; it affects only the tm_isdst flag and 2332 the abbreviation used during summer, which is now CAT, not WAST. 2333 Although (as noted by Michael Deckers) summer and winter time were 2334 both simply called "standard time" in Namibian law, in common 2335 practice winter time was considered to be DST (as noted by Stephen 2336 Colebourne). The full effect of this change is only in vanguard 2337 and main format; in rearguard format, the tm_isdst flag is still 2338 zero in winter and nonzero in summer. 2339 2340 In 1946/7 Czechoslovakia also observed negative DST in winter. 2341 The full effect of this change is only in vanguard and main 2342 formats; in rearguard format, it is modeled as plain GMT without 2343 daylight saving. Also, the dates of some 1944/5 DST transitions 2344 in Czechoslovakia have been changed. 2345 2346 2347 Release 2018d - 2018-03-22 07:05:46 -0700 2348 2349 Briefly: 2350 2351 Palestine starts DST a week earlier in 2018. 2352 Add support for vanguard and rearguard data consumers. 2353 Add subsecond precision to source data format, though not to data. 2354 2355 Changes to future timestamps 2356 2357 In 2018, Palestine starts DST on March 24, not March 31. 2358 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 2359 2360 Changes to past and future timestamps 2361 2362 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 2363 at 04:00. (Thanks to Steffen Thorsen.) 2364 2365 Changes to past timestamps 2366 2367 Historical transitions for Uruguay, represented by 2368 America/Montevideo, have been updated per official legal documents, 2369 replacing previous data mainly originating from the inventions of 2370 Shanks & Pottenger. This has resulted in adjustments ranging from 2371 30 to 90 minutes in either direction over at least two dozen 2372 distinct periods ranging from one day to several years in length. 2373 A mere handful of pre-1991 transitions are unaffected; data since 2374 then has come from more reliable contemporaneous reporting. These 2375 changes affect various timestamps in 1920-1923, 1936, 1939, 2376 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 2377 Additionally, Uruguay's pre-standard-time UT offset has been 2378 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 2379 match the location of the Observatory of the National Meteorological 2380 Institute in Montevideo. 2381 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 2382 2383 East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. 2384 (Thanks to Kerry Shetline.) 2385 2386 Fix the 1912-01-01 transition for Portugal and its colonies. 2387 This transition was at 00:00 according to the new UT offset, not 2388 according to the old one. Also assume that Cape Verde switched on 2389 the same date as the rest, not in 1907. This affects 2390 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 2391 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 2392 (Thanks to Michael Deckers.) 2393 2394 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 2395 Turks & Caicos. 2396 2397 Changes to past time zone abbreviations 2398 2399 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 2400 is no clock change associated with the transition. 2401 2402 Changes to build procedure 2403 2404 The new DATAFORM macro in the Makefile lets the installer choose 2405 among three source data formats. The idea is to lessen downstream 2406 disruption when data formats are improved. 2407 2408 * DATAFORM=vanguard installs from the latest, bleeding-edge 2409 format. DATAFORM=main (the default) installs from the format 2410 used in the 'africa' etc. files. DATAFORM=rearguard installs 2411 from a trailing-edge format. Eventually, elements of today's 2412 vanguard format should move to the main format, and similarly 2413 the main format's features should eventually move to the 2414 rearguard format. 2415 2416 * In the current version, the main and rearguard formats are 2417 identical and match that of 2018c, so this change does not 2418 affect default behavior. The vanguard format currently contains 2419 one feature not in the main format: negative SAVE values. This 2420 improves support for Ireland, which uses Irish Standard Time 2421 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 2422 supported negative SAVE values for decades, and this feature 2423 should move to the main format soon. However, it will not move 2424 to the rearguard format for quite some time because some 2425 downstream parsers do not support it. 2426 2427 * The build procedure constructs three files vanguard.zi, main.zi, 2428 and rearguard.zi, one for each format. Although the files 2429 represent essentially the same data, they may have minor 2430 discrepancies that users are not likely to notice. The files 2431 are intended for downstream data consumers and are not 2432 installed. Zoneinfo parsers that do not support negative SAVE values 2433 should start using rearguard.zi, so that they will be unaffected 2434 when the negative-DST feature moves from vanguard to main. 2435 Bleeding-edge Zoneinfo parsers that support the new features 2436 already can use vanguard.zi; in this respect, current tzcode is 2437 bleeding-edge. 2438 2439 The Makefile should now be safe for parallelized builds, and 'make 2440 -j to2050new.tzs' is now much faster on a multiprocessor host 2441 with GNU Make. 2442 2443 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 2444 prepends TZDIR/ to file names that do not begin with '/'. This is 2445 not recommended for general use, due to its security implications. 2446 (From a suggestion by Manuela Friedrich.) 2447 2448 Changes to code 2449 2450 zic now accepts subsecond precision in expressions like 2451 00:19:32.13, which is approximately the legal time of the 2452 Netherlands from 1835 to 1937. However, because it is 2453 questionable whether the few recorded uses of non-integer offsets 2454 had subsecond precision in practice, there are no plans for tzdata 2455 to use this feature. (Thanks to Steve Allen for pointing out 2456 the limitations of historical data in this area.) 2457 2458 The code is a bit more portable to MS-Windows. Installers can 2459 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 2460 reserve identifiers like 'localtime'. (Thanks to Manuela 2461 Friedrich.) 2462 2463 Changes to documentation and commentary 2464 2465 theory.html now outlines tzdb's extensions to POSIX's model for 2466 civil time, and has a section "POSIX features no longer needed" 2467 that lists POSIX API components that are now vestigial. 2468 (From suggestions by Steve Summit.) It also better distinguishes 2469 time zones from tz regions. (From a suggestion by Guy Harris.) 2470 2471 Commentary is now more consistent about using the phrase "daylight 2472 saving time", to match the C name tm_isdst. Daylight saving time 2473 need not occur in summer, and need not have a positive offset from 2474 standard time. 2475 2476 Commentary about historical transitions in Uruguay has been expanded 2477 with links to many relevant legal documents. 2478 (Thanks to Tim Parenti.) 2479 2480 Commentary now uses some non-ASCII characters with Unicode value 2481 less than U+0100, as they can be useful and should work even with 2482 older editors such as XEmacs. 2483 2484 2485 Release 2018c - 2018-01-22 23:00:44 -0800 2486 2487 Briefly: 2488 Revert Irish changes that relied on negative SAVE values. 2489 2490 Changes to tm_isdst 2491 2492 Revert the 2018a change to Europe/Dublin. As before, this change 2493 does not affect UT offsets or abbreviations; it affects only 2494 whether timestamps are considered to be standard time or 2495 daylight-saving time, as expressed in the tm_isdst flag of C's 2496 struct tm type. This reversion is intended to be a temporary 2497 workaround for problems discovered with downstream uses of 2498 releases 2018a and 2018b, which implemented Irish time by using 2499 negative SAVE values in the Eire rules of the 'europe' file. 2500 Although negative SAVE values have been part of tzcode for many 2501 years and are supported by many platforms, they were not 2502 documented before 2018a and ICU and OpenJDK do not currently 2503 support them. A mechanism to export data to platforms lacking 2504 support for negative DST is planned to be developed before the 2505 change is reapplied. (Problems reported by Deborah Goldsmith and 2506 Stephen Colebourne.) 2507 2508 Changes to past timestamps 2509 2510 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 2511 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 2512 2513 Changes to build procedure 2514 2515 The build procedure now works around mawk 1.3.3's lack of support 2516 for character class expressions. (Problem reported by Ohyama.) 2517 2518 2519 Release 2018b - 2018-01-17 23:24:48 -0800 2520 2521 Briefly: 2522 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 2523 2524 Changes to build procedure 2525 2526 The distribution now contains the file 'pacificnew' again. 2527 This file was inadvertently omitted in the 2018a distribution. 2528 (Problem reported by Matias Fonzo.) 2529 2530 2531 Release 2018a - 2018-01-12 22:29:21 -0800 2532 2533 Briefly: 2534 So Tom and Prncipe switched from +00 to +01. 2535 Brazil's DST will now start on November's first Sunday. 2536 Ireland's standard time is now in the summer, not the winter. 2537 Use Debian-style installation locations, instead of 4.3BSD-style. 2538 New zic option -t. 2539 2540 Changes to past and future timestamps 2541 2542 So Tom and Prncipe switched from +00 to +01 on 2018-01-01 at 2543 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 2544 2545 Changes to future timestamps 2546 2547 Starting in 2018 southern Brazil will begin DST on November's 2548 first Sunday instead of October's third Sunday. (Thanks to 2549 Steffen Thorsen.) 2550 2551 Changes to past timestamps 2552 2553 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 2554 been corrected. The 'backzone' and 'zone.tab' files did not agree 2555 with the 'africa' and 'zone1970.tab' files. (Problem reported by 2556 Michael Deckers.) 2557 2558 The abbreviation invented for Bolivia Summer Time (1931-2) is now 2559 BST instead of BOST, to be more consistent with the convention 2560 used for Latvian Summer Time (1918-9) and for British Summer Time. 2561 2562 Changes to tm_isdst 2563 2564 Change Europe/Dublin so that it observes Irish Standard Time (UT 2565 +01) in summer and GMT (as negative daylight-saving) in winter, 2566 instead of observing standard time (GMT) in winter and Irish 2567 Summer Time (UT +01) in summer. This change does not affect UT 2568 offsets or abbreviations; it affects only whether timestamps are 2569 considered to be standard time or daylight-saving time, as 2570 expressed in the tm_isdst flag of C's struct tm type. 2571 (Discrepancy noted by Derick Rethans.) 2572 2573 Changes to build procedure 2574 2575 The default installation locations have been changed to mostly 2576 match Debian circa 2017, instead of being designed as an add-on to 2577 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 2578 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 2579 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 2580 locations more precisely. (This responds to suggestions from 2581 Brian Inglis and from Steve Summit.) 2582 2583 The default installation procedure no longer creates the 2584 backward-compatibility link US/Pacific-New, which causes 2585 confusion during user setup (e.g., see Debian bug 815200). 2586 Use 'make BACKWARD="backward pacificnew"' to create the link 2587 anyway, for now. Eventually we plan to remove the link entirely. 2588 2589 tzdata.zi now contains a version-number comment. 2590 (Suggested by Tom Lane.) 2591 2592 The Makefile now quotes values like BACKWARD more carefully when 2593 passing them to the shell. (Problem reported by Zefram.) 2594 2595 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 2596 that have snprintf and use pre-C99 compilers. (Problem reported 2597 by Jon Skeet.) 2598 2599 Changes to code 2600 2601 zic has a new option -t FILE that specifies the location of the 2602 file that determines local time when TZ is unset. The default for 2603 this location can be configured via the new TZDEFAULT makefile 2604 macro, which defaults to /etc/localtime. 2605 2606 Diagnostics and commentary now distinguish UT from UTC more 2607 carefully; see theory.html for more information about UT vs UTC. 2608 2609 zic has been ported to GCC 8's -Wstringop-truncation option. 2610 (Problem reported by Martin Sebor.) 2611 2612 Changes to documentation and commentary 2613 2614 The zic man page now documents the longstanding behavior that 2615 times and years can be out of the usual range, with negative times 2616 counting backwards from midnight and with year 0 preceding year 1. 2617 (Problem reported by Michael Deckers.) 2618 2619 The theory.html file now mentions the POSIX limit of six chars 2620 per abbreviation, and lists alphabetic abbreviations used. 2621 2622 The files tz-art.htm and tz-link.htm have been renamed to 2623 tz-art.html and tz-link.html, respectively, for consistency with 2624 other file names and to simplify web server configuration. 2625 2626 2627 Release 2017c - 2017-10-20 14:49:34 -0700 2628 2629 Briefly: 2630 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 2631 Fiji ends DST 2018-01-14, not 2018-01-21. 2632 Namibia switches from +01/+02 to +02 on 2018-04-01. 2633 Sudan switches from +03 to +02 on 2017-11-01. 2634 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 2635 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 2636 A new file tzdata.zi now holds a small text copy of all data. 2637 The zic input format has been regularized slightly. 2638 2639 Changes to future timestamps 2640 2641 Northern Cyprus has decided to resume EU rules starting 2642 2017-10-29, thus reinstituting winter time. 2643 2644 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 2645 predicted. (Thanks to Dominic Fok.) Adjust future predictions 2646 accordingly. 2647 2648 Namibia will switch from +01 with DST to +02 all year on 2649 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 2650 at 02:00. (Thanks to Steffen Thorsen.) 2651 2652 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 2653 Atyya and Yahia Abdalla.) South Sudan is not switching, so 2654 Africa/Juba is no longer a link to Africa/Khartoum. 2655 2656 Tonga has likely ended its experiment with DST, and will not 2657 adjust its clocks on 2017-11-05. Although Tonga has not announced 2658 whether it will continue to observe DST, the IATA is assuming that 2659 it will not. (Thanks to David Wade.) 2660 2661 Turks & Caicos will switch from -04 all year to -05 with US DST on 2662 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 2663 at 02:00. (Thanks to Steffen Thorsen.) 2664 2665 Changes to past timestamps 2666 2667 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 2668 (Thanks to Arthur David Olson.) 2669 2670 Detroit did not observe DST in 1967. 2671 2672 Use railway time for Asia/Kolkata before 1941, by switching to 2673 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 2674 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 2675 2676 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 2677 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 2678 2679 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 2680 American time in 1892, not 1879. (Thanks to Michael Deckers.) 2681 2682 Adjust the 1867 transition in Alaska to better reflect the 2683 historical record, by changing it to occur on 1867-10-18 at 15:30 2684 Sitka time rather than at the start of 1867-10-17 local time. 2685 Although strictly speaking this is accurate only for Sitka, 2686 the rest of Alaska's blanks need to be filled in somehow. 2687 2688 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 2689 (Thanks to Michael Deckers.) 2690 2691 Add 7 s to the UT offset in Asia/Yangon before 1920. 2692 2693 Changes to zone names 2694 2695 Remove Canada/East-Saskatchewan from the 'backward' file, as it 2696 exceeded the 14-character limit and was an unused misnomer anyway. 2697 2698 Changes to build procedure 2699 2700 To support applications that prefer to read time zone data in text 2701 form, two zic input files tzdata.zi and leapseconds are now 2702 installed by default. The commands 'zic tzdata.zi' and 'zic -L 2703 leapseconds tzdata.zi' can reproduce the tzdata binary files 2704 without and with leap seconds, respectively. To prevent these two 2705 new files from being installed, use 'make TZDATA_TEXT=', and to 2706 suppress leap seconds from the tzdata text installation, use 'make 2707 TZDATA_TEXT=tzdata.zi'. 2708 2709 'make BACKWARD=' now suppresses backward-compatibility names 2710 like 'US/Pacific' that are defined in the 'backward' and 2711 'pacificnew' files. 2712 2713 'make check' now works on systems that lack a UTF-8 locale, 2714 or that lack the nsgmls program. Set UTF8_LOCALE to configure 2715 the name of a UTF-8 locale, if you have one. 2716 2717 Y2K runtime checks are no longer enabled by default. Add 2718 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 2719 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 2720 to disable them. (New name suggested by Brian Inglis.) 2721 2722 The build procedure for zdump now works on AIX 7.1. 2723 (Problem reported by Kees Dekker.) 2724 2725 Changes to code 2726 2727 zic and the reference runtime now reject multiple leap seconds 2728 within 28 days of each other, or leap seconds before the Epoch. 2729 As a result, support for double leap seconds, which was 2730 obsolescent and undocumented, has been removed. Double leap 2731 seconds were an error in the C89 standard; they have never existed 2732 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 2733 noticing glitches in the code that uncovered this problem.) 2734 2735 zic now warns about use of the obsolescent and undocumented -y 2736 option, and about use of the obsolescent TYPE field of Rule lines. 2737 2738 zic now allows unambiguous abbreviations like "Sa" and "Su" for 2739 weekdays; formerly it rejected them due to a bug. Conversely, zic 2740 no longer considers non-prefixes to be abbreviations; for example, 2741 it no longer accepts "lF" as an abbreviation for "lastFriday". 2742 Also, zic warns about the undocumented usage with a "last-" 2743 prefix, e.g., "last-Fri". 2744 2745 Similarly, zic now accepts the unambiguous abbreviation "L" for 2746 "Link" in ordinary context and for "Leap" in leap-second context. 2747 Conversely, zic no longer accepts non-prefixes such as "La" as 2748 abbreviations for words like "Leap". 2749 2750 zic no longer accepts leap second lines in ordinary input, or 2751 ordinary lines in leap second input. Formerly, zic sometimes 2752 warned about this undocumented usage and handled it incorrectly. 2753 2754 The new macro HAVE_TZNAME governs whether the tzname external 2755 variable is exported, instead of USG_COMPAT. USG_COMPAT now 2756 governs only the external variables "timezone" and "daylight". 2757 This change is needed because the three variables are not in the 2758 same category: although POSIX requires tzname, it specifies the 2759 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 2760 if not defined, the code attempts to guess it from other macros. 2761 2762 localtime.c and difftime.c no longer require stdio.h, and .c files 2763 other than zic.c no longer require sys/wait.h. 2764 2765 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 2766 2767 Calculation of time_t extrema works around a bug in GCC 4.8.4 2768 (Reported by Stan Shebs and Joseph Myers.) 2769 2770 zic.c no longer mistranslates formats of line numbers in non-English 2771 locales. (Problem reported by Benno Schulenberg.) 2772 2773 Several minor changes have been made to the code to make it a 2774 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 2775 Dekker for reporting the problems.) 2776 2777 Changes to documentation and commentary 2778 2779 The two new files 'theory.html' and 'calendars' contain the 2780 contents of the removed file 'Theory'. The goal is to document 2781 tzdb theory more accessibly. 2782 2783 The zic man page now documents abbreviation rules. 2784 2785 tz-link.htm now covers how to apply tzdata changes to clients. 2786 (Thanks to Jorge Fbregas for the AIX link.) It also mentions MySQL. 2787 2788 The leap-seconds.list URL has been updated to something that is 2789 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 2790 2791 Release 2017b - 2017-03-17 07:30:38 -0700 2792 2793 Briefly: Haiti has resumed DST. 2794 2795 Changes to past and future timestamps 2796 2797 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 2798 2799 Changes to past timestamps 2800 2801 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 2802 2803 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 2804 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 2805 2806 Changes to code 2807 2808 The reference localtime implementation now falls back on the 2809 current US daylight-saving transition rules rather than the 2810 1987-2006 rules. This fallback occurs only when (1) the TZ 2811 environment variable has a value like "AST4ADT" that asks 2812 for daylight saving time but does not specify the rules, (2) there 2813 is no file by that name, and (3) the TZDEFRULES file cannot be 2814 loaded. (Thanks to Tom Lane.) 2815 2816 2817 Release 2017a - 2017-02-28 00:05:36 -0800 2818 2819 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 2820 discontinues DST. 2821 2822 Changes to future timestamps 2823 2824 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 2825 2826 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 2827 Its clocks diverge from America/Santiago starting 2017-05-13 at 2828 23:00, hiving off a new zone America/Punta_Arenas. Although the 2829 Chilean government says this change expires in May 2019, for now 2830 assume it's permanent. (Thanks to Juan Correa and Deborah 2831 Goldsmith.) This also affects Antarctica/Palmer. 2832 2833 Changes to past timestamps 2834 2835 Fix many entries for historical timestamps for Europe/Madrid 2836 before 1979, to agree with tables compiled by Pere Planesas of the 2837 National Astronomical Observatory of Spain. As a side effect, 2838 this changes some timestamps for Africa/Ceuta before 1929, which 2839 are probably guesswork anyway. (Thanks to Steve Allen and 2840 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 2841 correcting the 1901 transition.) 2842 2843 Ecuador observed DST from 1992-11-28 to 1993-02-05. 2844 (Thanks to Alois Treindl.) 2845 2846 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 2847 (Thanks to Stepan Golosunov.) 2848 2849 Changes to past and future time zone abbreviations 2850 2851 Switch to numeric time zone abbreviations for South America, as 2852 part of the ongoing project of removing invented abbreviations. 2853 This avoids the need to invent an abbreviation for the new Chilean 2854 new zone. Similarly, switch from invented to numeric time zone 2855 abbreviations for Afghanistan, American Samoa, the Azores, 2856 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 2857 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 2858 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 2859 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 2860 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 2861 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 2862 Papua New Guinea, the Philippines, Pitcairn, Qatar, Runion, St 2863 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 2864 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 2865 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 2866 for half-hour daylight saving time in Belize before 1944 and in 2867 the Dominican Republic before 1975; and for Canary Islands before 2868 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 2869 Indian Summer Time before 1942, for Indonesia before around 1964, 2870 for Kenya before 1960, for Liberia before 1973, for Madeira before 2871 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 2872 Pakistan before 1971, for Western Sahara before 1977, and for 2873 Zaporozhye in 1880-1924. 2874 2875 For Alaska time from 1900 through 1967, instead of "CAT" use the 2876 abbreviation "AST", the abbreviation commonly used at the time 2877 (Atlantic Standard Time had not been standardized yet). Use "AWT" 2878 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 2879 2880 Use "CST" and "CDT" instead of invented abbreviations for Macau 2881 before 1999 and Taiwan before 1938, and use "JST" instead of the 2882 invented abbreviation "JCST" for Japan and Korea before 1938. 2883 2884 Change to database entry category 2885 2886 Move the Pacific/Johnston link from 'australasia' to 'backward', 2887 since Johnston is now uninhabited. 2888 2889 Changes to code 2890 2891 zic no longer mishandles some transitions in January 2038 when it 2892 attempts to work around Qt bug 53071. This fixes a bug affecting 2893 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 2894 now contains a workaround, useful when loading a file generated by 2895 a buggy zic. (Problem and localtime.c fix reported by Bradley 2896 White.) 2897 2898 zdump -i now outputs non-hour numeric time zone abbreviations 2899 without a colon, e.g., "+0530" rather than "+05:30". This agrees 2900 with zic %z and with common practice, and simplifies auditing of 2901 zdump output. 2902 2903 zdump is now buildable again with -DUSE_LTZ=0. 2904 (Problem reported by Joseph Myers.) 2905 2906 zdump.c now always includes private.h, to avoid code duplication 2907 with private.h. (Problem reported by Kees Dekker.) 2908 2909 localtime.c no longer mishandles early or late timestamps 2910 when TZ is set to a POSIX-style string that specifies DST. 2911 (Problem reported by Kees Dekker.) 2912 2913 date and strftime now cause %z to generate "-0000" instead of 2914 "+0000" when the UT offset is zero and the time zone abbreviation 2915 begins with "-". 2916 2917 Changes to documentation and commentary 2918 2919 The 'Theory' file now better documents choice of historical time 2920 zone abbreviations. (Problems reported by Michael Deckers.) 2921 2922 tz-link.htm now covers leap smearing, which is popular in clouds. 2923 2924 2925 Release 2016j - 2016-11-22 23:17:13 -0800 2926 2927 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 2928 2929 Changes to future timestamps 2930 2931 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 2932 This hives off a new zone Europe/Saratov from Europe/Volgograd. 2933 (Thanks to Yuri Konotopov and Stepan Golosunov.) 2934 2935 Changes to past timestamps 2936 2937 The new zone Asia/Atyrau for Atyra Region, Kazakhstan, is like 2938 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 2939 1999, not fall 1994. (Thanks to Stepan Golosunov.) 2940 2941 Changes to past time zone abbreviations 2942 2943 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 2944 summer time before 1948. The old use of "EET" was a typo. 2945 2946 Changes to code 2947 2948 zic no longer mishandles file systems that lack hard links, fixing 2949 bugs introduced in 2016g. (Problems reported by Tom Lane.) 2950 Also, when the destination already contains symbolic links, zic 2951 should now work better on systems where the 'link' system call 2952 does not follow symbolic links. 2953 2954 Changes to documentation and commentary 2955 2956 tz-link.htm now documents the relationship between release version 2957 numbers and development-repository commit tags. (Suggested by 2958 Paul Koning.) 2959 2960 The 'Theory' file now documents UT. 2961 2962 iso3166.tab now accents "Curaao", and commentary now mentions 2963 the names "Cabo Verde" and "Czechia". (Thanks to Ji Boh.) 2964 2965 2966 Release 2016i - 2016-11-01 23:19:52 -0700 2967 2968 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 2969 reintroduces DST on 2016-11-06. 2970 2971 Changes to future timestamps 2972 2973 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 2974 2017-01-15 at 03:00. Assume future observances in Tonga will be 2975 from the first Sunday in November through the third Sunday in 2976 January, like Fiji. (Thanks to Pulu Anau.) Switch to numeric 2977 time zone abbreviations for this zone. 2978 2979 Changes to past and future timestamps 2980 2981 Northern Cyprus is now +03 year round, causing a split in Cyprus 2982 time zones starting 2016-10-30 at 04:00. This creates a zone 2983 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 2984 2985 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 2986 (Thanks to Steffen Thorsen.) 2987 2988 Changes to past timestamps 2989 2990 Several corrections were made for pre-1975 timestamps in Italy. 2991 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 2992 Europe/Vatican. 2993 2994 First, the 1893-11-01 00:00 transition in Italy used the new UT 2995 offset (+01), not the old (+00:49:56). (Thanks to Michael 2996 Deckers.) 2997 2998 Second, rules for daylight saving in Italy were changed to agree 2999 with Italy's National Institute of Metrological Research (INRiM) 3000 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 3001 Inglis, and Michael Deckers): 3002 3003 The 1916-06-03 transition was at 24:00, not 00:00. 3004 3005 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 3006 00:00, not 01:00. 3007 3008 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 3009 01:00. 3010 3011 The 1944-09-17 transition was at 03:00, not 01:00. This 3012 particular change is taken from Italian law as INRiM's table, 3013 (which says 02:00) appears to have a typo here. Also, keep the 3014 1944-04-03 transition for Europe/Rome, as Rome was controlled by 3015 Germany then. 3016 3017 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 3018 not 00:00. 3019 3020 Changes to code 3021 3022 The code should now be buildable on AmigaOS merely by setting the 3023 appropriate Makefile variables. (From a patch by Carsten Larsen.) 3024 3025 3026 Release 2016h - 2016-10-19 23:17:57 -0700 3027 3028 Changes to future timestamps 3029 3030 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 3031 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 3032 future fall transitions will be on the last Saturday of October 3033 at 01:00, which is consistent with predicted spring transitions 3034 on the last Saturday of March. (Thanks to Tim Parenti.) 3035 3036 Changes to past timestamps 3037 3038 In Turkey, transitions in 1986-1990 were at 01:00 standard time 3039 not at 02:00, and the spring 1994 transition was on March 20, not 3040 March 27. (Thanks to Kvan Yazan.) 3041 3042 Changes to past and future time zone abbreviations 3043 3044 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 3045 instead of alphabetic ones like "IST" and "LKT". Various 3046 English-language sources use "IST", "LKT" and "SLST", with no 3047 working consensus. (Usage of "SLST" mentioned by Sadika 3048 Sumanapala.) 3049 3050 Changes to code 3051 3052 zic no longer mishandles relativizing file names when creating 3053 symbolic links like /etc/localtime, when these symbolic links 3054 are outside the usual directory hierarchy. This fixes a bug 3055 introduced in 2016g. (Problem reported by Andreas Stieger.) 3056 3057 Changes to build procedure 3058 3059 New rules 'traditional_tarballs' and 'traditional_signatures' for 3060 building just the traditional-format distribution. (Requested by 3061 Deborah Goldsmith.) 3062 3063 The file 'version' is now put into the tzdata tarball too. 3064 (Requested by Howard Hinnant.) 3065 3066 Changes to documentation and commentary 3067 3068 The 'Theory' file now has a section on interface stability. 3069 (Requested by Paul Koning.) It also mentions features like 3070 tm_zone and localtime_rz that have long been supported by the 3071 reference code. 3072 3073 tz-link.htm has improved coverage of time zone boundaries suitable 3074 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 3075 Johnson.) 3076 3077 The US commentary now mentions Allen and the "day of two noons". 3078 3079 The Fiji commentary mentions the government's 2016-10-03 press 3080 release. (Thanks to Raymond Kumar.) 3081 3082 3083 Release 2016g - 2016-09-13 08:56:38 -0700 3084 3085 Changes to future timestamps 3086 3087 Turkey switched from EET/EEST (+02/+03) to permanent +03, 3088 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 3089 than an invented abbreviation for the new time. 3090 3091 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 3092 (Thanks to Tim Parenti.) 3093 3094 Changes to past timestamps 3095 3096 For America/Los_Angeles, spring-forward transition times have been 3097 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 3098 1950-1966. 3099 3100 For zones using Soviet time on 1919-07-01, transitions to UT-based 3101 time were at 00:00 UT, not at 02:00 local time. The affected 3102 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 3103 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 3104 3105 Changes to past and future time zone abbreviations 3106 3107 The Factory zone now uses the time zone abbreviation -00 instead 3108 of a long English-language string, as -00 is now the normal way to 3109 represent an undefined time zone. 3110 3111 Several zones in Antarctica and the former Soviet Union, along 3112 with zones intended for ships at sea that cannot use POSIX TZ 3113 strings, now use numeric time zone abbreviations instead of 3114 invented or obsolete alphanumeric abbreviations. The affected 3115 zones are Antarctica/Casey, Antarctica/Davis, 3116 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 3117 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 3118 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 3119 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 3120 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 3121 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 3122 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 3123 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 3124 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 3125 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 3126 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 3127 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 3128 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 3129 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 3130 was replaced by +05, whereas MSK and MSD were kept as they are not 3131 our invention and are widely used. 3132 3133 Changes to zone names 3134 3135 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 3136 (Thanks to David Massoud.) 3137 3138 Changes to code 3139 3140 zic no longer generates binary files containing POSIX TZ-like 3141 strings that disagree with the local time type after the last 3142 explicit transition in the data. This fixes a bug with 3143 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 3144 on the reference platform. (Thanks to Alexander Belopolsky for 3145 reporting the bug and suggesting a way forward.) 3146 3147 If the installed localtime and/or posixrules files are symbolic 3148 links, zic now keeps them symbolic links when updating them, for 3149 compatibility with platforms like OpenSUSE where other programs 3150 configure these files as symlinks. 3151 3152 zic now avoids hard linking to symbolic links, avoids some 3153 unnecessary mkdir and stat system calls, and uses shorter file 3154 names internally. 3155 3156 zdump has a new -i option to generate transitions in a 3157 smaller but still human-readable format. This option is 3158 experimental, and the output format may change in future versions. 3159 (Thanks to Jon Skeet for suggesting that an option was needed, 3160 and thanks to Tim Parenti and Chris Rovick for further comments.) 3161 3162 Changes to build procedure 3163 3164 An experimental distribution format is available, in addition 3165 to the traditional format which will continue to be distributed. 3166 The new format is a tarball tzdb-VERSION.tar.lz with signature 3167 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 3168 tzdb-VERSION containing the code and data of the traditional 3169 two-tarball format, along with extra data that may be useful. 3170 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 3171 for comments about the experimental format.) 3172 3173 The release version number is now more accurate in the usual case 3174 where releases are built from a Git repository. For example, if 3175 23 commits and some working-file changes have been made since 3176 release 2016g, the version number is now something like 3177 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 3178 Tagged releases use the same version number format as before, 3179 e.g., '2016g'. To support the more accurate version number, its 3180 specification has moved from a line in the Makefile to a new 3181 source file 'version'. 3182 3183 The experimental distribution contains a file to2050.tzs that 3184 contains what should be the output of 'zdump -i -c 2050' on 3185 primary zones. If this file is available, 'make check' now checks 3186 that zdump generates this output. 3187 3188 'make check_web' now works on Fedora-like distributions. 3189 3190 Changes to documentation and commentary 3191 3192 tzfile.5 now documents the new restriction on POSIX TZ-like 3193 strings that is now implemented by zic. 3194 3195 Comments now cite URLs for some 1917-1921 Russian DST decrees. 3196 (Thanks to Alexander Belopolsky.) 3197 3198 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 3199 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 3200 description of Java 8 has been brought up to date (thanks to 3201 Stephen Colebourne). Its description of local time on Mars has 3202 been updated to match current practice, and URLs have been updated 3203 and some obsolete ones removed. 3204 3205 3206 Release 2016f - 2016-07-05 16:26:51 +0200 3207 3208 Changes affecting future timestamps 3209 3210 The Egyptian government changed its mind on short notice, and 3211 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 3212 (Thanks to Mina Samuel.) 3213 3214 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 3215 (Thanks to Stepan Golosunov.) 3216 3217 Changes to past and future timestamps 3218 3219 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 3220 abbreviations instead of invented ones. 3221 3222 Changes affecting past timestamps 3223 3224 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 3225 (Thanks to Stepan Golosunov.) 3226 3227 3228 Release 2016e - 2016-06-14 08:46:16 -0700 3229 3230 Changes affecting future timestamps 3231 3232 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 3233 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 3234 For future years, guess April's last Thursday to October's last 3235 Thursday except for Ramadan. 3236 3237 Changes affecting past timestamps 3238 3239 Locations while uninhabited now use '-00', not 'zzz', as a 3240 placeholder time zone abbreviation. This is inspired by Internet 3241 RFC 3339 and is more consistent with numeric time zone 3242 abbreviations already used elsewhere. The change affects several 3243 arctic and antarctic locations, e.g., America/Cambridge_Bay before 3244 1920 and Antarctica/Troll before 2005. 3245 3246 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 3247 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 3248 3249 Changes to code 3250 3251 zic now outputs a dummy transition at time 2**31 - 1 in zones 3252 whose POSIX-style TZ strings contain a '<'. This mostly works 3253 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 3254 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 3255 3256 Changes affecting documentation and commentary 3257 3258 tz-link.htm says why governments should give plenty of notice for 3259 time zone or DST changes, and refers to Matt Johnson's blog post. 3260 3261 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 3262 3263 3264 Release 2016d - 2016-04-17 22:50:29 -0700 3265 3266 Changes affecting future timestamps 3267 3268 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 3269 (Thanks to Alexander Krivenyshev for the heads-up.) 3270 3271 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 3272 (Thanks to Alexander Krivenyshev and Matt Johnson.) 3273 3274 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 3275 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 3276 at 02:00. (Thanks to Stepan Golosunov.) 3277 3278 Changes affecting past timestamps 3279 3280 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 3281 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 3282 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 3283 the same change. (Thanks to Stepan Golosunov.) 3284 3285 Russia and nearby locations had daylight-saving transitions on 3286 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 3287 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 3288 Golosunov.) 3289 3290 Many corrections to historical time in Kazakhstan from 1991 3291 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 3292 invented time zone abbreviations with numeric abbreviations. 3293 3294 Changes to commentary 3295 3296 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 3297 3298 3299 Release 2016c - 2016-03-23 00:51:27 -0700 3300 3301 Changes affecting future timestamps 3302 3303 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 3304 3305 Chile reverts from permanent to seasonal DST. (Thanks to Juan 3306 Correa for the heads-up, and to Tim Parenti for corrections.) 3307 Guess that future transitions are August's and May's second 3308 Saturdays at 24:00 mainland time. Also, call the period from 3309 2014-09-07 through 2016-05-14 daylight saving time instead of 3310 standard time, as that seems more appropriate now. 3311 3312 Changes affecting past timestamps 3313 3314 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 3315 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 3316 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 3317 (Thanks to Stepan Golosunov.) 3318 3319 Changes to commentary 3320 3321 Several updates and URLs for historical and proposed Russian changes. 3322 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 3323 3324 3325 Release 2016b - 2016-03-12 17:30:14 -0800 3326 3327 Compatibility note 3328 3329 Starting with release 2016b, some data entries cause zic implementations 3330 derived from tz releases 2005j through 2015e to issue warnings like 3331 "time zone abbreviation differs from POSIX standard (+03)". 3332 These warnings should not otherwise affect zic's output and can safely be 3333 ignored on today's platforms, as the warnings refer to a restriction in 3334 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 3335 warnings is to upgrade to zic derived from tz releases 2015f and later. 3336 3337 Changes affecting future timestamps 3338 3339 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 3340 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 3341 2016-03-27 at 02:00 local time. They need distinct zones since their 3342 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 3343 Altai Republic, Russia, which will switch from +06 to +07 on the same date 3344 and local time. The Astrakhan change is already official; the others have 3345 passed the first reading in the State Duma and are extremely likely. 3346 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 3347 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 3348 and Stepan Golosunov for followup.) 3349 3350 As a trial of a new system that needs less information to be made up, 3351 the new zones use numeric time zone abbreviations like "+04" 3352 instead of invented abbreviations like "ASTT". 3353 3354 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 3355 Steffen Thorsen.) 3356 3357 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 3358 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 3359 Saturday at 01:00, not March's last Friday at 24:00. 3360 3361 Changes affecting past timestamps 3362 3363 Europe/Chisinau observed DST during 1990, and switched from +04 to 3364 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 3365 (Thanks to Stepan Golosunov.) 3366 3367 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 3368 KUYT/KUYST. (Thanks to Stepan Golosunov.) 3369 3370 Changes to code 3371 3372 tzselect's diagnostics and checking, and checktab.awk's checking, 3373 have been improved. (Thanks to J William Piggott.) 3374 3375 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 3376 3377 tzselect now tests Julian-date TZ settings more accurately. 3378 (Thanks to J William Piggott.) 3379 3380 Changes to commentary 3381 3382 Comments in zone tables have been improved. (Thanks to J William Piggott.) 3383 3384 tzselect again limits its menu comments so that menus fit on a 3385 2480 alphanumeric display. 3386 3387 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 3388 3389 In the Theory file, the description of possible time zone abbreviations in 3390 tzdata has been cleaned up, as the old description was unclear and 3391 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 3392 3393 3394 Release 2016a - 2016-01-26 23:28:02 -0800 3395 3396 Changes affecting future timestamps 3397 3398 America/Cayman will not observe daylight saving this year after all. 3399 Revert our guess that it would. (Thanks to Matt Johnson.) 3400 3401 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 3402 (Thanks to Alexander Krivenyshev.) 3403 3404 Asia/Tehran now has DST predictions for the year 2038 and later, 3405 to be March 21 00:00 to September 21 00:00. This is likely better 3406 than predicting no DST, albeit off by a day every now and then. 3407 3408 Changes affecting past and future timestamps 3409 3410 America/Metlakatla switched from PST all year to AKST/AKDT on 3411 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 3412 3413 America/Santa_Isabel has been removed, and replaced with a 3414 backward compatibility link to America/Tijuana. Its contents were 3415 apparently based on a misreading of Mexican legislation. 3416 3417 Changes affecting past timestamps 3418 3419 Asia/Karachi's two transition times in 2002 were off by a minute. 3420 (Thanks to Matt Johnson.) 3421 3422 Changes affecting build procedure 3423 3424 An installer can now combine leap seconds with use of the backzone file, 3425 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 3426 The old 'make posix_packrat' rule is now marked as obsolescent. 3427 (Thanks to Ian Abbott for an initial implementation.) 3428 3429 Changes affecting documentation and commentary 3430 3431 A new file LICENSE makes it easier to see that the code and data 3432 are mostly public-domain. (Thanks to James Knight.) The three 3433 non-public-domain files now use the current (3-clause) BSD license 3434 instead of older versions of that license. 3435 3436 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 3437 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 3438 on editing tz source files (with a mention of Sublime zoneinfo, 3439 thanks to Gilmore Davidson). 3440 3441 The Theory and asia files now mention the 2015 book "The Global 3442 Transformation of Time, 1870-1950", and cite a couple of reviews. 3443 3444 The America/Chicago entry now documents the informal use of US 3445 central time in Fort Pierre, South Dakota. (Thanks to Rick 3446 McDermid, Matt Johnson, and Steve Jones.) 3447 3448 3449 Release 2015g - 2015-10-01 00:39:51 -0700 3450 3451 Changes affecting future timestamps 3452 3453 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 3454 (Thanks to Fatih.) 3455 3456 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 3457 (Thanks to Alexander Krivenyshev.) 3458 3459 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 3460 (Thanks to Ken Rylander.) 3461 3462 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 3463 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 3464 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 3465 3466 Changes affecting past timestamps 3467 3468 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 3469 3470 Changes affecting code 3471 3472 localtime no longer mishandles America/Anchorage after 2037. 3473 (Thanks to Bradley White for reporting the bug.) 3474 3475 On hosts with signed 32-bit time_t, localtime no longer mishandles 3476 Pacific/Fiji after 2038-01-16 14:00 UTC. 3477 3478 The localtime module allows the variables 'timezone', 'daylight', 3479 and 'altzone' to be in common storage shared with other modules, 3480 and declares them in case the system <time.h> does not. 3481 (Problems reported by Kees Dekker.) 3482 3483 On platforms with tm_zone, strftime.c now assumes it is not NULL. 3484 This simplifies the code and is consistent with zdump.c. 3485 (Problem reported by Christos Zoulas.) 3486 3487 Changes affecting documentation 3488 3489 The tzfile man page now documents that transition times denote the 3490 starts (not the ends) of the corresponding time periods. 3491 (Ambiguity reported by Bill Seymour.) 3492 3493 3494 Release 2015f - 2015-08-10 18:06:56 -0700 3495 3496 Changes affecting future timestamps 3497 3498 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 3499 The abbreviation remains "KST". (Thanks to Robert Elz.) 3500 3501 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 3502 and Pablo Camargo.) 3503 3504 Changes affecting past and future timestamps 3505 3506 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 3507 (Thanks to Roman Tudos.) 3508 3509 Changes affecting data format and code 3510 3511 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 3512 field of a Rule line should now be '-'; the old values 'even', 3513 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 3514 Although the implementation has not changed, these features do not 3515 work in the default installation, they are not used in the data, 3516 and they are now considered obsolescent. 3517 3518 zic now checks that two rules don't take effect at the same time. 3519 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 3520 simultaneity are now documented. 3521 3522 The two characters '%z' in a zone format now stand for the UT 3523 offset, e.g., '-07' for seven hours behind UT and '+0530' for 3524 five hours and thirty minutes ahead. This better supports time 3525 zone abbreviations conforming to POSIX.1-2001 and later. 3526 3527 Changes affecting installed data files 3528 3529 Comments for America/Halifax and America/Glace_Bay have been improved. 3530 (Thanks to Brian Inglis.) 3531 3532 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 3533 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 3534 installed data files for Europe/Simferopol and Europe/Tallinn. 3535 It does not affect timestamps. (Thanks to Howard Hinnant.) 3536 3537 Changes affecting code 3538 3539 zdump and zic no longer warn about valid time zone abbreviations 3540 like '-05'. 3541 3542 Some Visual Studio 2013 warnings have been suppressed. 3543 (Thanks to Kees Dekker.) 3544 3545 'date' no longer sets the time of day and its -a, -d, -n and -t 3546 options have been removed. Long obsolescent, the implementation 3547 of these features had porting problems. Builders no longer need 3548 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 3549 (Thanks to Kees Dekker for pointing out the problem.) 3550 3551 Changes affecting documentation 3552 3553 The Theory file mentions naming issues earlier, as these seem to be 3554 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 3555 3556 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 3557 3558 Mention that Herbert Samuel introduced the term "Summer Time". 3559 3560 3561 Release 2015e - 2015-06-13 10:56:02 -0700 3562 3563 Changes affecting future timestamps 3564 3565 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 3566 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 3567 3568 Assume Cayman Islands will observe DST starting next year, using US rules. 3569 Although it isn't guaranteed, it is the most likely. 3570 3571 Changes affecting data format 3572 3573 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 3574 spell the names of land Islands, Cte d'Ivoire, and Runion. 3575 3576 Changes affecting code 3577 3578 When displaying data, tzselect converts it to the current locale's 3579 encoding if the iconv command works. (Problem reported by random832.) 3580 3581 tzselect no longer mishandles Dominica, fixing a bug introduced 3582 in Release 2014f. (Problem reported by Owen Leibman.) 3583 3584 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 3585 This fixes a bug introduced in Release 2014f. 3586 (Problem reported by Leonardo Chiquitto.) 3587 3588 3589 Release 2015d - 2015-04-24 08:09:46 -0700 3590 3591 Changes affecting future timestamps 3592 3593 Egypt will not observe DST in 2015 and will consider canceling it 3594 permanently. For now, assume no DST indefinitely. 3595 (Thanks to Ahmed Nazmy and Tim Parenti.) 3596 3597 Changes affecting past timestamps 3598 3599 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 3600 1966-07-01. Also, Yukon's time zone history is documented better. 3601 (Thanks to Brian Inglis and Dennis Ferguson.) 3602 3603 Change affecting past and future time zone abbreviations 3604 3605 The abbreviations for Hawaii-Aleutian standard and daylight times 3606 have been changed from HAST/HADT to HST/HDT, as per US Government 3607 Printing Office style. This affects only America/Adak since 1983, 3608 as America/Honolulu was already using the new style. 3609 3610 Changes affecting code 3611 3612 zic has some minor performance improvements. 3613 3614 3615 Release 2015c - 2015-04-11 08:55:55 -0700 3616 3617 Changes affecting future timestamps 3618 3619 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 3620 not 00:00 on April's last Friday. 2015's transition will therefore be on 3621 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 3622 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 3623 3624 Changes affecting past timestamps 3625 3626 The following changes affect some pre-1991 Chile-related timestamps 3627 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 3628 3629 The 1910 transition was January 10, not January 1. 3630 3631 The 1918 transition was September 10, not September 1. 3632 3633 The UT -04 time observed from 1932 to 1942 is now considered to 3634 be standard time, not year-round DST. 3635 3636 Santiago observed DST (UT -03) from 1946-07-15 through 3637 1946-08-31, then reverted to standard time, then switched to -05 3638 on 1947-04-01. 3639 3640 Assume transitions before 1968 were at 00:00, since we have no data 3641 saying otherwise. 3642 3643 The spring 1988 transition was 1988-10-09, not 1988-10-02. 3644 The fall 1990 transition was 1990-03-11, not 1990-03-18. 3645 3646 Assume no UT offset change for Pacific/Easter on 1890-01-01, 3647 and omit all transitions on Pacific/Easter from 1942 through 1946 3648 since we have no data suggesting that they existed. 3649 3650 One more zone has been turned into a link, as it differed 3651 from an existing zone only for older timestamps. As usual, 3652 this change affects UT offsets in pre-1970 timestamps only. 3653 The zone's old contents have been moved to the 'backzone' file. 3654 The affected zone is America/Montreal. 3655 3656 Changes affecting commentary 3657 3658 Mention the TZUpdater tool. 3659 3660 Mention "The Time Now". (Thanks to Brandon Ramsey.) 3661 3662 3663 Release 2015b - 2015-03-19 23:28:11 -0700 3664 3665 Changes affecting future timestamps 3666 3667 Mongolia will start observing DST again this year, from the last 3668 Saturday in March at 02:00 to the last Saturday in September at 00:00. 3669 (Thanks to Ganbold Tsagaankhuu.) 3670 3671 Palestine will start DST on March 28, not March 27. Also, 3672 correct the fall 2014 transition from September 26 to October 24. 3673 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 3674 3675 Changes affecting past timestamps 3676 3677 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 3678 regression. (Thanks to Stuart Bishop for reporting the problem.) 3679 3680 Some more zones have been turned into links, when they differed 3681 from existing zones only for older timestamps. As usual, 3682 these changes affect UT offsets in pre-1970 timestamps only. 3683 Their old contents have been moved to the 'backzone' file. 3684 The affected zones are: America/Antigua, America/Cayman, 3685 Pacific/Midway, and Pacific/Saipan. 3686 3687 Changes affecting time zone abbreviations 3688 3689 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 3690 (Thanks to Hank W.) 3691 3692 Changes affecting code 3693 3694 Fix integer overflow bug in reference 'mktime' implementation. 3695 (Problem reported by Jrg Richter.) 3696 3697 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 3698 to be used in the same executable as standard-library time_t functions. 3699 (Problems reported by Bradley White.) 3700 3701 Changes affecting commentary 3702 3703 Cite the recent Mexican decree changing Quintana Roo's time zone. 3704 (Thanks to Carlos Ral Perasso.) 3705 3706 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 3707 3708 Update info about Mars time. 3709 3710 3711 Release 2015a - 2015-01-29 22:35:20 -0800 3712 3713 Changes affecting future timestamps 3714 3715 The Mexican state of Quintana Roo, represented by America/Cancun, 3716 will shift from Central Time with DST to Eastern Time without DST 3717 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 3718 3719 Chile will not change clocks in April or thereafter; its new standard time 3720 will be its old daylight saving time. This affects America/Santiago, 3721 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 3722 3723 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 3724 (Thanks to Tim Parenti.) 3725 3726 Changes affecting past timestamps 3727 3728 Iceland observed DST in 1919 and 1921, and its 1939 fallback 3729 transition was Oct. 29, not Nov. 29. Remove incorrect data from 3730 Shanks about time in Iceland between 1837 and 1908. 3731 3732 Some more zones have been turned into links, when they differed 3733 from existing zones only for older timestamps. As usual, 3734 these changes affect UT offsets in pre-1970 timestamps only. 3735 Their old contents have been moved to the 'backzone' file. 3736 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 3737 and Asia/Muscat. 3738 3739 Changes affecting code 3740 3741 tzalloc now scrubs time zone abbreviations compatibly with the way 3742 that tzset always has, by replacing invalid bytes with '_' and by 3743 shortening too-long abbreviations. 3744 3745 tzselect ports to POSIX awk implementations, no longer mishandles 3746 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 3747 settings to the user. (Thanks to Stefan Kuhn.) 3748 3749 Changes affecting build procedure 3750 3751 'make check' now checks for links to links in the data. 3752 One such link (for Africa/Asmera) has been fixed. 3753 (Thanks to Stephen Colebourne for pointing out the problem.) 3754 3755 Changes affecting commentary 3756 3757 The leapseconds file commentary now mentions the expiration date. 3758 (Problem reported by Martin Burnicki.) 3759 3760 Update Mexican Library of Congress URL. 3761 3762 3763 Release 2014j - 2014-11-10 17:37:11 -0800 3764 3765 Changes affecting current and future timestamps 3766 3767 Turks & Caicos' switch from US eastern time to UT -04 year-round 3768 did not occur on 2014-11-02 at 02:00. It's currently scheduled 3769 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 3770 3771 Changes affecting past timestamps 3772 3773 Many pre-1989 timestamps have been corrected for Asia/Seoul and 3774 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 3775 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 3776 longer guess that Pyongyang mimicked Seoul time after World War II, 3777 as this is politically implausible. 3778 3779 Some more zones have been turned into links, when they differed 3780 from existing zones only for older timestamps. As usual, 3781 these changes affect UT offsets in pre-1970 timestamps only. 3782 Their old contents have been moved to the 'backzone' file. 3783 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 3784 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 3785 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 3786 Indian/Mayotte. 3787 3788 Changes affecting commentary 3789 3790 The commentary is less enthusiastic about Shanks as a source, 3791 and is more careful to distinguish UT from UTC. 3792 3793 3794 Release 2014i - 2014-10-21 22:04:57 -0700 3795 3796 Changes affecting future timestamps 3797 3798 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 3799 (Thanks to Ken Rylander for the heads-up.) Guess that future 3800 years will use a similar pattern. 3801 3802 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 3803 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 3804 (Thanks to Kiley Walbom for the heads-up.) 3805 3806 Changes affecting time zone abbreviations 3807 3808 Since Belarus is not changing its clocks even though Moscow is, 3809 the time zone abbreviation in Europe/Minsk is changing from FET 3810 to its more traditional value MSK on 2014-10-26 at 01:00. 3811 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 3812 3813 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 3814 Indochina, to distinguish it better from ICT (+07). 3815 3816 Changes affecting past timestamps 3817 3818 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 3819 (thanks to Trn Ngc Qun for an indirect pointer to Trn Tin Bnh's 3820 authoritative book). Asia/Ho_Chi_Minh has been added to 3821 zone1970.tab, to give tzselect users in Vietnam two choices, 3822 since north and south Vietnam disagreed after our 1970 cutoff. 3823 3824 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 3825 they differed from existing zones only for older timestamps. As 3826 usual, these changes affect pre-1970 timestamps only. Their old 3827 contents have been moved to the 'backzone' file. 3828 3829 Changes affecting code 3830 3831 The time-related library functions now set errno on failure, and 3832 some crashes in the new tzalloc-related library functions have 3833 been fixed. (Thanks to Christos Zoulas for reporting most of 3834 these problems and for suggesting fixes.) 3835 3836 If USG_COMPAT is defined and the requested timestamp is standard time, 3837 the tz library's localtime and mktime functions now set the extern 3838 variable timezone to a value appropriate for that timestamp; and 3839 similarly for ALTZONE, daylight saving time, and the altzone variable. 3840 This change is a companion to the tzname change in 2014h, and is 3841 designed to make timezone and altzone more compatible with tzname. 3842 3843 The tz library's functions now set errno to EOVERFLOW if they fail 3844 because the result cannot be represented. ctime and ctime_r now 3845 return NULL and set errno when a timestamp is out of range, rather 3846 than having undefined behavior. 3847 3848 Some bugs associated with the new 2014g functions have been fixed. 3849 This includes a bug that largely incapacitated the new functions 3850 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 3851 It also includes some uses of uninitialized variables after tzalloc. 3852 The new code uses the standard type 'ssize_t', which the Makefile 3853 now gives porting advice about. 3854 3855 Changes affecting commentary 3856 3857 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 3858 3859 3860 Release 2014h - 2014-09-25 18:59:03 -0700 3861 3862 Changes affecting past timestamps 3863 3864 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 3865 3866 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 3867 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 3868 3869 Some more zones have been turned into links, when they differed 3870 from existing zones only for older timestamps. As usual, 3871 these changes affect UT offsets in pre-1970 timestamps only. 3872 Their old contents have been moved to the 'backzone' file. 3873 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 3874 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 3875 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 3876 3877 Changes affecting code 3878 3879 zdump -V and -v now output gmtoff= values on all platforms, 3880 not merely on platforms defining TM_GMTOFF. 3881 3882 The tz library's localtime and mktime functions now set tzname to a value 3883 appropriate for the requested timestamp, and zdump now uses this 3884 on platforms not defining TM_ZONE, fixing a 2014g regression. 3885 (Thanks to Tim Parenti for reporting the problem.) 3886 3887 The tz library no longer sets tzname if localtime or mktime fails. 3888 3889 zdump -c no longer mishandles transitions near year boundaries. 3890 (Thanks to Tim Parenti for reporting the problem.) 3891 3892 An access to uninitialized data has been fixed. 3893 (Thanks to Jrg Richter for reporting the problem.) 3894 3895 When THREAD_SAFE is defined, the code ports to the C11 memory model. 3896 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 3897 and two threads race to initialize data used by gmtime-like functions. 3898 (Thanks to Andy Heninger for reporting the problems.) 3899 3900 Changes affecting build procedure 3901 3902 'make check' now checks better for properly sorted data. 3903 3904 Changes affecting documentation and commentary 3905 3906 zdump's gmtoff=N output is now documented, and its isdst=D output 3907 is now documented to possibly output D values other than 0 or 1. 3908 3909 zdump -c's treatment of years is now documented to use the 3910 Gregorian calendar and Universal Time without leap seconds, 3911 and its behavior at cutoff boundaries is now documented better. 3912 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 3913 3914 Programs are now documented to use the proleptic Gregorian calendar. 3915 (Thanks to Alan Barrett for the suggestion.) 3916 3917 Fractional-second GMT offsets have been documented for civil time 3918 in 19th-century Chennai, Jakarta, and New York. 3919 3920 3921 Release 2014g - 2014-08-28 12:31:23 -0700 3922 3923 Changes affecting future timestamps 3924 3925 Turks & Caicos is switching from US eastern time to UT -04 3926 year-round, modeled as a switch on 2014-11-02 at 02:00. 3927 [As noted in 2014j, this switch was later delayed.] 3928 3929 Changes affecting past timestamps 3930 3931 Time in Russia or the USSR before 1926 or so has been corrected by 3932 a few seconds in the following zones: Asia/Irkutsk, 3933 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 3934 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 3935 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 3936 Vladimir Karpinsky.) 3937 3938 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 3939 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 3940 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 3941 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 3942 (Thanks to Stephen Colebourne for pointing to the decree.) 3943 3944 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 3945 3946 A new file 'backzone' contains data which may appeal to 3947 connoisseurs of old timestamps, although it is out of scope for 3948 the tz database, is often poorly sourced, and contains some data 3949 that is known to be incorrect. The new file is not recommended 3950 for ordinary use and its entries are not installed by default. 3951 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 3952 Isle of Man entries.) 3953 3954 Some more zones have been turned into links, when they differed 3955 from existing zones only for older timestamps. As usual, 3956 these changes affect UT offsets in pre-1970 timestamps only. 3957 Their old contents have been moved to the 'backzone' file. 3958 The affected zones are: Africa/Bangui, Africa/Brazzaville, 3959 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 3960 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 3961 3962 Changes affecting code 3963 3964 Unless NETBSD_INSPIRED is defined to 0, the tz library now 3965 supplies functions for creating and using objects that represent 3966 timezones. The new functions are tzalloc, tzfree, localtime_rz, 3967 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 3968 time2posix_z. They are intended for performance: for example, 3969 localtime_rz (unlike localtime_r) is trivially thread-safe without 3970 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 3971 functions, and to Alan Barrett and Jonathan Lennox for helping to 3972 debug the change.) 3973 3974 zdump now builds with the tz library unless USE_LTZ is defined to 0, 3975 This lets zdump use tz features even if the system library lacks them. 3976 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 3977 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 3978 3979 zdump now uses localtime_rz if available, as it's significantly faster, 3980 and it can help zdump better diagnose invalid timezone names. 3981 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 3982 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 3983 not available, zdump now uses localtime_r and tzset if available, 3984 as this is a bit cleaner and faster than plain localtime. Compile 3985 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 3986 lacks these two functions. 3987 3988 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 3989 Although not needed for tz's own applications, which are single-threaded, 3990 this supports POSIX better if the tz library is used in multithreaded apps. 3991 3992 Some crashes have been fixed when zdump or the tz library is given 3993 invalid or outlandish input. 3994 3995 The tz library no longer mishandles leap seconds on platforms with 3996 unsigned time_t in timezones that lack ordinary transitions after 1970. 3997 3998 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 3999 already defined, to make it easier to configure on common platforms. 4000 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 4001 4002 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 4003 assumes that reading uninitialized memory yields garbage values 4004 but does not cause other problems such as traps. 4005 4006 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 4007 more likely to guess right for ambiguous timestamps near 4008 transitions where tm_isdst does not change. 4009 4010 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 4011 strftime_l for compatibility with recent versions of POSIX. 4012 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 4013 to 1 on recent POSIX versions, and to 0 otherwise. 4014 4015 tzselect -c now uses a hybrid distance measure that works better 4016 in Africa. (Thanks to Alan Barrett for noting the problem.) 4017 4018 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 4019 or when time_tz is defined. 4020 4021 When HAVE_UTMPX_H is set the 'date' command now builds on systems 4022 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 4023 the date it updates the wtmpx file if _PATH_WTMPX is defined. 4024 This affects GNU/Linux and similar systems. 4025 4026 For easier maintenance later, some C code has been simplified, 4027 some lint has been removed, and the code has been tweaked so that 4028 plain 'make' is more likely to work. 4029 4030 The C type 'bool' is now used for boolean values, instead of 'int'. 4031 4032 The long-obsolete LOCALE_HOME code has been removed. 4033 4034 The long-obsolete 'gtime' function has been removed. 4035 4036 Changes affecting build procedure 4037 4038 'zdump' no longer links in ialloc.o, as it's not needed. 4039 4040 'make check_time_t_alternatives' no longer assumes GNU diff. 4041 4042 Changes affecting distribution tarballs 4043 4044 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 4045 the tzdata tarball instead of the tzcode tarball, since they help 4046 maintain the data. The NEWS and Theory files are now also 4047 distributed in the tzdata tarball, as they're relevant for data. 4048 (Thanks to Alan Barrett for pointing this out.) Also, the 4049 leapseconds.awk file is no longer distributed in the tzcode 4050 tarball, since it belongs in the tzdata tarball (where 2014f 4051 inadvertently also distributed it). 4052 4053 Changes affecting documentation and commentary 4054 4055 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 4056 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 4057 for debugging it.) 4058 4059 The man pages have been updated to use function prototypes, 4060 to document thread-safe variants like localtime_r, and to document 4061 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 4062 mktime_z. 4063 4064 The fields in Link lines have been renamed to be more descriptive 4065 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 4066 and LINK-TO has become LINK-NAME. 4067 4068 tz-link.htm mentions the IETF's tzdist working group; Windows 4069 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 4070 4071 Some broken URLs have been fixed in the commentary. (Thanks to 4072 Lester Caine.) 4073 4074 Commentary about Philippines DST has been updated, and commentary 4075 on pre-1970 time in India has been added. 4076 4077 4078 Release 2014f - 2014-08-05 17:42:36 -0700 4079 4080 Changes affecting future timestamps 4081 4082 Russia will subtract an hour from most of its time zones on 2014-10-26 4083 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 4084 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 4085 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 4086 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 4087 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 4088 (Europe/Samara) are not changing their clocks. The changed zones are 4089 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 4090 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 4091 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 4092 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 4093 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 4094 but not its UTC offset. Two zones are added: Asia/Chita (split 4095 from Asia/Yakutsk, and also with two hours subtracted) and 4096 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 4097 subtracted). (Thanks to Tim Parenti for much of the above.) 4098 4099 Changes affecting time zone abbreviations 4100 4101 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 4102 and similarly for the other Australian zones. That is, for eastern 4103 standard and daylight saving time the abbreviations are AEST and AEDT 4104 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 4105 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 4106 This change does not affect UT offsets, only time zone abbreviations. 4107 (Thanks to Rich Tibbett and many others.) 4108 4109 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 4110 effective 2014-10-26 at 02:00 local time. 4111 4112 The time zone abbreviation for Xinjiang Time (observed in rmqi) 4113 has been changed from URUT to XJT. (Thanks to Luther Ma.) 4114 4115 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 4116 Similarly, prefer EET/EEST for eastern European time in Russia. 4117 4118 Change time zone abbreviations in (western) Samoa to use "ST" and 4119 "DT" suffixes, as this is more likely to match common practice. 4120 Prefix "W" to (western) Samoa time when its standard-time offset 4121 disagrees with that of American Samoa. 4122 4123 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 4124 4125 Time zone abbreviations have been updated for Japan's two time 4126 zones used 1896-1937. JWST now stands for Western Standard 4127 Time, and JCST for Central Standard Time (formerly this was CJT). 4128 These abbreviations are now used for time in Korea, Taiwan, 4129 and Sakhalin while controlled by Japan. 4130 4131 Changes affecting past timestamps 4132 4133 China's five zones have been simplified to two, since the post-1970 4134 differences in the other three seem to have been imaginary. The 4135 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 4136 removed; backwards-compatibility links still work, albeit with 4137 different behaviors for timestamps before May 1980. Asia/Urumqi's 4138 1980 transition to UT +08 has been removed, so that it is now at 4139 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 4140 Treindl sent helpful translations of two papers by Guo Qingsheng.) 4141 4142 Some zones have been turned into links, when they differed from existing 4143 zones only for older UT offsets where data entries were likely invented. 4144 These changes affect UT offsets in pre-1970 timestamps only. This is 4145 similar to the change in release 2013e, except this time for western 4146 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 4147 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 4148 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 4149 Atlantic/St_Helena. This also affects the backwards-compatibility 4150 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 4151 Tim Parenti, and David Patte for reporting problems in earlier 4152 versions of this change.) 4153 4154 Asia/Shanghai's pre-standard-time UT offset has been changed from 4155 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 4156 transition to standard time has been changed from 1928 to 1901. 4157 4158 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 4159 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 4160 In 1946 it observed DST from 05-15 through 09-30; in 1947 4161 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 4162 (Thanks to Yu-Cheng Chuang.) 4163 4164 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 4165 4166 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 4167 10-03 at 00:00. (Thanks to Konstantin Hyppnen.) 4168 4169 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 4170 period from 1911 to 1950. 4171 4172 Pacific/Chatham has been changed to New Zealand standard time plus 4173 45 minutes for the period before 1957, reflecting a 1956 remark in 4174 the New Zealand parliament. 4175 4176 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 4177 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 4178 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 4179 not 04-06 at 02:00; and there was no DST in 1920. 4180 4181 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 4182 4183 Time in Russia before 1927 or so has been corrected by a few seconds in 4184 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 4185 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 4186 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 4187 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 4188 4189 Changes affecting data format 4190 4191 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 4192 The new file's extended format allows multiple country codes per zone. 4193 The older file is still installed but is deprecated; its format is 4194 not changing and it will still be distributed for a while, but new 4195 applications should use the new file. 4196 4197 The new file format simplifies maintenance of obscure locations. 4198 To test this, it adds coverage for the Crozet Islands and the 4199 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 4200 4201 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 4202 It is still ASCII now, but commentary about the switch has been added. 4203 The new file 'zone1970.tab' already uses UTF-8. 4204 4205 Changes affecting code 4206 4207 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 4208 is defined. (Thanks to Elliott Hughes for reporting the problem.) 4209 4210 'zic' no longer mishandles input when ignoring case in locales that 4211 are not compatible with English, e.g., unibyte Turkish locales when 4212 compiled with HAVE_GETTEXT. 4213 4214 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 4215 they no longer use ASCII '-' as if it were a dash. 4216 4217 'zic' now rejects output file names that contain '.' or '..' components. 4218 (Thanks to Tim Parenti for reporting the problem.) 4219 4220 'zic -v' now warns about output file names that do not follow 4221 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 4222 David Olson for starting the ball rolling on this.) 4223 4224 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 4225 4226 Changes affecting build procedure 4227 4228 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 4229 (Thanks to John Cochran.) 4230 4231 Changes affecting documentation and commentary 4232 4233 The 'Theory' file documents legacy names, the longstanding 4234 exceptions to the POSIX-inspired file name rules. 4235 4236 The 'zic' documentation clarifies the role of time types when 4237 interpreting dates. (Thanks to Arthur David Olson.) 4238 4239 Documentation and commentary now prefer UTF-8 to US-ASCII, 4240 allowing the use of proper accents in foreign words and names. 4241 Code and data have not changed because of this. (Thanks to 4242 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 4243 this.) 4244 4245 Non-HTML documentation and commentary now use plain-text URLs instead of 4246 HTML insertions, and are more consistent about bracketing URLs when they 4247 are not already surrounded by white space. (Thanks to suggestions by 4248 Steffen Nurpmeso.) 4249 4250 There is new commentary about Xujiahui Observatory, the five time-zone 4251 project in China from 1918 to 1949, timekeeping in Japanese-occupied 4252 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 4253 warlord Jin Shuren in the data. 4254 4255 Commentary about the coverage of each Russian zone has been standardized. 4256 (Thanks to Tim Parenti.) 4257 4258 There is new commentary about contemporary timekeeping in Ethiopia. 4259 4260 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 4261 4262 There is new commentary about time in Poland in 1919. 4263 4264 Proper credit has been given to DST inventor George Vernon Hudson. 4265 4266 Commentary about time in Metlakatla, AK and Resolute, NU has been 4267 improved, with a new source for the former. 4268 4269 In zone.tab, Pacific/Easter no longer mentions Salas y Gmez, as it 4270 is uninhabited. 4271 4272 Commentary about permanent Antarctic bases has been updated. 4273 4274 Several typos have been corrected. (Thanks to Tim Parenti for 4275 contributing some of these fixes.) 4276 4277 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 4278 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 4279 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 4280 (Thanks to a heads-up from Dirkjan Ochtman.) 4281 4282 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 4283 have been removed. These obsolescent US Naval Observatory entries were no 4284 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 4285 4286 4287 Release 2014e - 2014-06-12 21:53:52 -0700 4288 4289 Changes affecting near-future timestamps 4290 4291 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 4292 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 4293 switch to standard time at 24:00 the last Thursday before Ramadan, and 4294 back to DST at 00:00 the first Friday after Ramadan. 4295 4296 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 4297 to Milamber Space Network.) Guess that from 2015 on Morocco will 4298 temporarily switch to standard time at 03:00 the last Saturday before 4299 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 4300 4301 Changes affecting past timestamps 4302 4303 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 4304 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 4305 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 4306 in 1991. (Thanks to Hank W. for reporting the problems.) 4307 4308 Changes affecting commentary 4309 4310 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 4311 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 4312 removes stale pointers to World Time Explorer and WORLDTIME. 4313 4314 4315 Release 2014d - 2014-05-27 21:34:40 -0700 4316 4317 Changes affecting code 4318 4319 zic no longer generates files containing timestamps before the Big Bang. 4320 This works around GNOME glib bug 878 4321 <https://gitlab.gnome.org/GNOME/glib/issues/878> 4322 (Thanks to Leonardo Chiquitto for reporting the bug, and to 4323 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 4324 4325 Changes affecting documentation 4326 4327 tz-link.htm now mentions GNOME. 4328 4329 4330 Release 2014c - 2014-05-13 07:44:13 -0700 4331 4332 Changes affecting near-future timestamps 4333 4334 Egypt observes DST starting 2014-05-15 at 24:00. 4335 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 4336 Details have not been announced, except that DST will not be observed 4337 during Ramadan. Guess that DST will stop during the same Ramadan dates as 4338 Morocco, and that Egypt's future spring and fall transitions will be the 4339 same as 2010 when it last observed DST, namely April's last Friday at 4340 00:00 to September's last Thursday at 23:00 standard time. Also, guess 4341 that Ramadan transitions will be at 00:00 standard time. 4342 4343 Changes affecting code 4344 4345 zic now generates transitions for minimum time values, eliminating guesswork 4346 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 4347 4348 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 4349 4350 Changes affecting commentary and documentation 4351 4352 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 4353 4354 4355 Release 2014b - 2014-03-24 21:28:50 -0700 4356 4357 Changes affecting near-future timestamps 4358 4359 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 4360 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 4361 4362 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 4363 Bengt-Inge Larsson.) This is currently an approximation; a better version 4364 will require the zic and localtime fixes mentioned below, and the plan is 4365 to wait for a while until at least the zic fixes propagate. 4366 4367 Changes affecting code 4368 4369 'zic' and 'localtime' no longer reject locations needing four transitions 4370 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 4371 Also, 'zic' avoids some unlikely failures due to integer overflow. 4372 4373 Changes affecting build procedure 4374 4375 'make check' now detects Rule lines defined but never used. 4376 The NZAQ rules, an instance of this problem, have been removed. 4377 4378 Changes affecting commentary and documentation 4379 4380 Fix Tuesday/Thursday typo in description of time in Israel. 4381 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 4382 4383 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 4384 to Donald MacQueen.) Instead, the Microsoft Windows Store app 4385 library supports them. 4386 4387 Add comments about Johnston Island time in the 1960s. 4388 (Thanks to Lyle McElhaney.) 4389 4390 Morocco's 2014 DST start will be as predicted. 4391 (Thanks to Sebastien Willemijns.) 4392 4393 4394 Release 2014a - 2014-03-07 23:30:29 -0800 4395 4396 Changes affecting near-future timestamps 4397 4398 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 4399 the heads-up, and to Tim Parenti for simplifying the update.) 4400 4401 Changes affecting past timestamps 4402 4403 Fiji ended DST on 2014-01-19 at 02:00, not the previously scheduled 03:00. 4404 (Thanks to Steffen Thorsen.) 4405 4406 Ukraine switched from Moscow to Eastern European time on 1990-07-01 4407 (not 1992-01-01), and observed DST during the entire next winter. 4408 (Thanks to Vladimir in Moscow via Alois Treindl.) 4409 4410 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 4411 (Thanks to Avigdor Finkelstein.) 4412 4413 Changes affecting code 4414 4415 A uninitialized-storage bug in 'localtime' has been fixed. 4416 (Thanks to Logan Chien.) 4417 4418 Changes affecting the build procedure 4419 4420 The settings for 'make check_web' now default to Ubuntu 13.10. 4421 4422 Changes affecting commentary and documentation 4423 4424 The boundary of the US Pacific time zone is given more accurately. 4425 (Thanks to Alan Mintz.) 4426 4427 Chile's 2014 DST will be as predicted. (Thanks to Jos Miguel Garrido.) 4428 4429 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Ral Perasso.) 4430 4431 Better descriptions of countries with same time zone history as 4432 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 4433 4434 Several changes affect tz-link.htm, the main web page. 4435 4436 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 4437 David Braverman). 4438 4439 Mention xCal (Internet RFC 6321) and jCal. 4440 4441 Microsoft has some support for tz database names. 4442 4443 CLDR data formats include both XML and JSON. 4444 4445 Mention Maggiolo's map of solar vs standard time. 4446 (Thanks to Arthur David Olson.) 4447 4448 Mention TZ4Net. (Thanks to Matt Johnson.) 4449 4450 Mention the timezone-olson Haskell package. 4451 4452 Mention zeitverschiebung.net. (Thanks to Martin Jger.) 4453 4454 Remove moribund links to daylight-savings-time.info and to 4455 Simple Timer + Clocks. 4456 4457 Update two links. (Thanks to Oscar van Vlijmen.) 4458 4459 Fix some formatting glitches, e.g., remove random newlines from 4460 abbr elements' title attributes. 4461 4462 4463 Release 2013i - 2013-12-17 07:25:23 -0800 4464 4465 Changes affecting near-future timestamps: 4466 4467 Jordan switches back to standard time at 00:00 on December 20, 2013. 4468 The 2006-2011 transition schedule is planned to resume in 2014. 4469 (Thanks to Steffen Thorsen.) 4470 4471 Changes affecting past timestamps: 4472 4473 In 2004, Cuba began DST on March 28, not April 4. 4474 (Thanks to Steffen Thorsen.) 4475 4476 Changes affecting code 4477 4478 The compile-time flag NOSOLAR has been removed, as nowadays the 4479 benefit of slightly shrinking runtime table size is outweighed by the 4480 cost of disallowing potential future updates that exceed old limits. 4481 4482 Changes affecting documentation and commentary 4483 4484 The files solar87, solar88, and solar89 are no longer distributed. 4485 They were a negative experiment - that is, a demonstration that 4486 tz data can represent solar time only with some difficulty and error. 4487 Their presence in the distribution caused confusion, as Riyadh 4488 civil time was generally not solar time in those years. 4489 4490 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 4491 4492 4493 Release 2013h - 2013-10-25 15:32:32 -0700 4494 4495 Changes affecting current and future timestamps: 4496 4497 Libya has switched its UT offset back to +02 without DST, instead 4498 of +01 with DST. (Thanks to Even Scharning.) 4499 4500 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 4501 (Thanks to Gwillim Law.) 4502 4503 Changes affecting future timestamps: 4504 4505 Acre and (we guess) western Amazonas will switch from UT -04 to -05 4506 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 4507 (Thanks to Steffen Thorsen.) 4508 4509 Add entries for DST transitions in Morocco in the year 2038. 4510 This avoids some year-2038 glitches introduced in 2013g. 4511 (Thanks to Yoshito Umaoka for reporting the problem.) 4512 4513 Changes affecting API 4514 4515 The 'tzselect' command no longer requires the 'select' command, 4516 and should now work with /bin/sh on more platforms. It also works 4517 around a bug in BusyBox awk before version 1.21.0. (Thanks to 4518 Patrick 'P. J.' McDermott and Alan Barrett.) 4519 4520 Changes affecting code 4521 4522 Fix localtime overflow bugs with 32-bit unsigned time_t. 4523 4524 zdump no longer assumes sscanf returns maximal values on overflow. 4525 4526 Changes affecting the build procedure 4527 4528 The builder can specify which programs to use, if any, instead of 4529 'ar' and 'ranlib', and libtz.a is now built locally before being 4530 installed. (Thanks to Michael Forney.) 4531 4532 A dependency typo in the 'zdump' rule has been fixed. 4533 (Thanks to Andrew Paprocki.) 4534 4535 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 4536 work as specified by POSIX.2-1992 or later; this is portable nowadays. 4537 4538 'make clean' no longer removes 'leapseconds', since it's 4539 host-independent and is part of the distribution. 4540 4541 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 4542 4543 Changes affecting documentation and commentary 4544 4545 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 4546 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 4547 4548 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 4549 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 4550 longer maintained) and for old advisories. SOFA now does C. 4551 4552 Release 2013g - 2013-09-30 21:08:26 -0700 4553 4554 Changes affecting current and near-future timestamps 4555 4556 Morocco now observes DST from the last Sunday in March to the last 4557 Sunday in October, not April to September respectively. (Thanks 4558 to Steffen Thorsen.) 4559 4560 Changes affecting 'zic' 4561 4562 'zic' now runs on platforms that lack both hard links and symlinks. 4563 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 4564 Also, fix some bugs on platforms that lack hard links but have symlinks. 4565 4566 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 4567 to predict the far future, fixing a bug introduced in 2013e. 4568 4569 Changes affecting the build procedure 4570 4571 The 'leapseconds' file is again put into the tzdata tarball. 4572 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 4573 Matt Burgess and Ian Abbott.) The timestamps of these and other 4574 dependent files in tarballs are adjusted more consistently. 4575 4576 Changes affecting documentation and commentary 4577 4578 The README file is now part of the data tarball as well as the code. 4579 It now states that files are public domain unless otherwise specified. 4580 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 4581 Its details about the 1989 release moved to a place of honor near 4582 the end of NEWS. 4583 4584 4585 Release 2013f - 2013-09-24 23:37:36 -0700 4586 4587 Changes affecting near-future timestamps 4588 4589 Tocantins will very likely not observe DST starting this spring. 4590 (Thanks to Steffen Thorsen.) 4591 4592 Jordan will likely stay at UT +03 indefinitely, and will not fall 4593 back this fall. 4594 4595 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 4596 4597 Changes affecting API 4598 4599 The types of the global variables 'timezone' and 'altzone' (if present) 4600 have been changed back to 'long'. This is required for 'timezone' 4601 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 4602 These variables were originally 'long' in the tz code, but were 4603 mistakenly changed to 'time_t' in 1987; nobody reported the 4604 incompatibility until now. The difference matters on x32, where 4605 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 4606 4607 Changes affecting the build procedure 4608 4609 Avoid long strings in leapseconds.awk to work around a mawk bug. 4610 (Thanks to Cyril Baurand.) 4611 4612 Changes affecting documentation and commentary 4613 4614 New file 'NEWS' that contains release notes like this one. 4615 4616 Paraguay's law does not specify DST transition time; 00:00 is customary. 4617 (Thanks to Waldemar Villamayor-Venialbo.) 4618 4619 Minor capitalization fixes. 4620 4621 Changes affecting version-control only 4622 4623 The experimental GitHub repository now contains annotated and 4624 signed tags for recent releases, e.g., '2013e' for Release 2013e. 4625 Releases are tagged starting with 2012e; earlier releases were 4626 done differently, and tags would either not have a simple name or 4627 not exactly match what was released. 4628 4629 'make set-timestamps' is now simpler and a bit more portable. 4630 4631 4632 Release 2013e - 2013-09-19 23:50:04 -0700 4633 4634 Changes affecting near-future timestamps 4635 4636 This year Fiji will start DST on October 27, not October 20. 4637 (Thanks to David Wheeler for the heads-up.) For now, guess that 4638 Fiji will continue to spring forward the Sunday before the fourth 4639 Monday in October. 4640 4641 Changes affecting current and future time zone abbreviations 4642 4643 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 4644 time zone abbreviations since 1932. (Thanks to George Ziegler, 4645 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 4646 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 4647 Asia/Makassar, and Asia/Pontianak. 4648 4649 Use ART (UT -03, standard time), rather than WARST (also -03, but 4650 daylight saving time) for San Luis, Argentina since 2009. 4651 4652 Changes affecting Godthb timestamps after 2037 if version mismatch 4653 4654 Allow POSIX-like TZ strings where the transition time's hour can 4655 range from -167 through 167, instead of the POSIX-required 0 4656 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 4657 new Fiji rules. This is a more compact way to represent 4658 far-future timestamps for America/Godthab, America/Santiago, 4659 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 4660 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 4661 this change. (Derived from a suggestion by Arthur David Olson.) 4662 4663 Allow POSIX-like TZ strings where daylight saving time is in 4664 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 4665 Argentina Summer Time all year. This supports a more compact way 4666 to represent the 2013d data for America/Argentina/San_Luis. 4667 Because of the change for San Luis noted above this change does not 4668 affect the current data. (Thanks to Andrew Main (Zefram) for 4669 suggestions that improved this change.) 4670 4671 Where these two TZ changes take effect, there is a minor extension 4672 to the tz file format in that it allows new values for the 4673 embedded TZ-format string, and the tz file format version number 4674 has therefore been increased from 2 to 3 as a precaution. 4675 Version-2-based client code should continue to work as before for 4676 all timestamps before 2038. Existing version-2-based client code 4677 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 4678 files, and typically works in practice even for timestamps after 4679 2037; the only known exception is America/Godthab. 4680 4681 Changes affecting timestamps before 1970 4682 4683 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 4684 some errors before 1947. 4685 4686 Some zones have been turned into links, when they differ from existing 4687 zones only in older data entries that were likely invented or that 4688 differ only in LMT or transitions from LMT. These changes affect 4689 only timestamps before 1943. The affected zones are: 4690 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 4691 America/Grenada, America/Guadeloupe, America/Marigot, 4692 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 4693 America/St_Lucia, America/St_Thomas, America/St_Vincent, 4694 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 4695 confirming that the old Europe/Vaduz zone was wrong and the new 4696 link is better for WWII-era times.) 4697 4698 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 4699 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 4700 from 1890 to 1912. 4701 4702 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 4703 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 4704 to Alois Treindl.) 4705 4706 Change the date of the circa-1850 Zurich transition from 1849-09-12 4707 to 1853-07-16, overriding Shanks with data from Messerli about 4708 postal and telegraph time in Switzerland. 4709 4710 Changes affecting time zone abbreviations before 1970 4711 4712 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 4713 as Jakarta was called Batavia back then. 4714 4715 Changes affecting API 4716 4717 The 'zic' command now outputs a dummy transition when far-future 4718 data can't be summarized using a TZ string, and uses a 402-year 4719 window rather than a 400-year window. For the current data, this 4720 affects only the Asia/Tehran file. It does not affect any of the 4721 timestamps that this file represents, so zdump outputs the same 4722 information as before. (Thanks to Andrew Main (Zefram).) 4723 4724 The 'date' command has a new '-r' option, which lets you specify 4725 the integer time to display, a la FreeBSD. 4726 4727 The 'tzselect' command has two new options '-c' and '-n', which lets you 4728 select a zone based on latitude and longitude. 4729 4730 The 'zic' command's '-v' option now warns about constructs that 4731 require the new version-3 binary file format. (Thanks to Arthur 4732 David Olson for the suggestion.) 4733 4734 Support for floating-point time_t has been removed. 4735 It was always dicey, and POSIX no longer requires it. 4736 (Thanks to Eric Blake for suggesting to the POSIX committee to 4737 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 4738 Heninger, Arthur David Olson, and Alois Treindl, for reporting 4739 bugs and elucidating some of the corners of the old floating-point 4740 implementation.) 4741 4742 The signatures of 'offtime', 'timeoff', and 'gtime' have been 4743 changed back to the old practice of using 'long' to represent UT 4744 offsets. This had been inadvertently and mistakenly changed to 4745 'int_fast32_t'. (Thanks to Christos Zoulas.) 4746 4747 The code avoids undefined behavior on integer overflow in some 4748 more places, including gmtime, localtime, mktime and zdump. 4749 4750 Changes affecting the zdump utility 4751 4752 zdump now outputs "UT" when referring to Universal Time, not "UTC". 4753 "UTC" does not make sense for timestamps that predate the introduction 4754 of UTC, whereas "UT", a more generic term, does. (Thanks to Steve Allen 4755 for clarifying UT vs UTC.) 4756 4757 Data changes affecting behavior of tzselect and similar programs 4758 4759 Country code BQ is now called the more common name "Caribbean Netherlands" 4760 rather than the more official "Bonaire, St Eustatius & Saba". 4761 4762 Remove from zone.tab the names America/Montreal, America/Shiprock, 4763 and Antarctica/South_Pole, as they are equivalent to existing 4764 same-country-code zones for post-1970 timestamps. The data entries for 4765 these names are unchanged, so the names continue to work as before. 4766 4767 Changes affecting code internals 4768 4769 zic -c now runs way faster on 64-bit hosts when given large numbers. 4770 4771 zic now uses vfprintf to avoid allocating and freeing some memory. 4772 4773 tzselect now computes the list of continents from the data, 4774 rather than have it hard-coded. 4775 4776 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 4777 4778 Changes affecting the build procedure 4779 4780 The 'leapseconds' file is now generated automatically from a 4781 new file 'leap-seconds.list', which is a copy of 4782 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 4783 A new source file 'leapseconds.awk' implements this. 4784 The goal is simplification of the future maintenance of 'leapseconds'. 4785 4786 When building the 'posix' or 'right' subdirectories, if the 4787 subdirectory would be a copy of the default subdirectory, it is 4788 now made a symbolic link if that is supported. This saves about 4789 2 MB of file system space. 4790 4791 The links America/Shiprock and Antarctica/South_Pole have been 4792 moved to the 'backward' file. This affects only nondefault builds 4793 that omit 'backward'. 4794 4795 Changes affecting version-control only 4796 4797 .gitignore now ignores 'date'. 4798 4799 Changes affecting documentation and commentary 4800 4801 Changes to the 'tzfile' man page 4802 4803 It now mentions that the binary file format may be extended in 4804 future versions by appending data. 4805 4806 It now refers to the 'zdump' and 'zic' man pages. 4807 4808 Changes to the 'zic' man page 4809 4810 It lists conditions that elicit a warning with '-v'. 4811 4812 It says that the behavior is unspecified when duplicate names 4813 are given, or if the source of one link is the target of another. 4814 4815 Its examples are updated to match the latest data. 4816 4817 The definition of white space has been clarified slightly. 4818 (Thanks to Michael Deckers.) 4819 4820 Changes to the 'Theory' file 4821 4822 There is a new section about the accuracy of the tz database, 4823 describing the many ways that errors can creep in, and 4824 explaining why so many of the pre-1970 timestamps are wrong or 4825 misleading (thanks to Steve Allen, Lester Caine, and Garrett 4826 Wollman for discussions that contributed to this). 4827 4828 The 'Theory' file describes LMT better (this follows a 4829 suggestion by Guy Harris). 4830 4831 It refers to the 2013 edition of POSIX rather than the 2004 edition. 4832 4833 It's mentioned that excluding 'backward' should not affect the 4834 other data, and it suggests at least one zone.tab name per 4835 inhabited country (thanks to Stephen Colebourne). 4836 4837 Some longstanding restrictions on names are documented, e.g., 4838 'America/New_York' precludes 'America/New_York/Bronx'. 4839 4840 It gives more reasons for the 1970 cutoff. 4841 4842 It now mentions which time_t variants are supported, such as 4843 signed integer time_t. (Thanks to Paul Goyette for reporting 4844 typos in an experimental version of this change.) 4845 4846 (Thanks to Philip Newton for correcting typos in these changes.) 4847 4848 Documentation and commentary is more careful to distinguish UT in 4849 general from UTC in particular. (Thanks to Steve Allen.) 4850 4851 Add a better source for the Zurich 1894 transition. 4852 (Thanks to Pierre-Yves Berger.) 4853 4854 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 4855 4856 4857 Release 2013d - 2013-07-05 07:38:01 -0700 4858 4859 Changes affecting future timestamps: 4860 4861 Morocco's midsummer transitions this year are July 7 and August 10, 4862 not July 9 and August 8. (Thanks to Andrew Paprocki.) 4863 4864 Israel now falls back on the last Sunday of October. 4865 (Thanks to Ephraim Silverberg.) 4866 4867 Changes affecting past timestamps: 4868 4869 Specify Jerusalem's location more precisely; this changes the pre-1880 4870 times by 2 s. 4871 4872 Changing affecting metadata only: 4873 4874 Fix typos in the entries for country codes BQ and SX. 4875 4876 Changes affecting code: 4877 4878 Rework the code to fix a bug with handling Australia/Macquarie on 4879 32-bit hosts (thanks to Arthur David Olson). 4880 4881 Port to platforms like NetBSD, where time_t can be wider than long. 4882 4883 Add support for testing time_t types other than the system's. 4884 Run 'make check_time_t_alternatives' to try this out. 4885 Currently, the tests fail for unsigned time_t; 4886 this should get fixed at some point. 4887 4888 Changes affecting documentation and commentary: 4889 4890 Deemphasize the significance of national borders. 4891 4892 Update the zdump man page. 4893 4894 Remove obsolete NOID comment (thanks to Denis Excoffier). 4895 4896 Update several URLs and comments in the web pages. 4897 4898 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 4899 4900 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 4901 4902 4903 Release 2013c - 2013-04-19 16:17:40 -0700 4904 4905 Changes affecting current and future timestamps: 4906 4907 Palestine observed DST starting March 29, 2013. (Thanks to 4908 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 4909 with the predicted rules being the last Thursday in March at 24:00 4910 to the first Friday on or after September 21 at 01:00. 4911 4912 Assume that the recent change to Paraguay's DST rules is permanent, 4913 by moving the end of DST to the 4th Sunday in March every year. 4914 (Thanks to Carlos Ral Perasso.) 4915 4916 Changes affecting past timestamps: 4917 4918 Fix some historical data for Palestine to agree with that of 4919 timeanddate.com, as follows: 4920 4921 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 4922 00:00 Apr 1. 4923 4924 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 4925 02:00. 4926 4927 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 4928 4929 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 4930 4931 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 4932 4933 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 4934 4935 Fix times of habitation for Macquarie to agree with the Tasmania 4936 Parks & Wildlife Service history, which indicates that permanent 4937 habitation was 1899-1919 and 1948 on. 4938 4939 Changing affecting metadata only: 4940 4941 Macquarie Island is politically part of Australia, not Antarctica. 4942 (Thanks to Tobias Conradi.) 4943 4944 Sort Macquarie more consistently with other parts of Australia. 4945 (Thanks to Tim Parenti.) 4946 4947 4948 Release 2013b - 2013-03-10 22:33:40 -0700 4949 4950 Changes affecting current and future timestamps: 4951 4952 Haiti uses US daylight-saving rules this year, and presumably future years. 4953 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 4954 4955 Paraguay will end DST on March 24 this year. 4956 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 4957 4958 Morocco does not observe DST during Ramadan; 4959 try to predict Ramadan in Morocco as best we can. 4960 (Thanks to Erik Homoet for the heads-up.) 4961 4962 Changes affecting commentary: 4963 4964 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 4965 Update URL for Solaris. Mention Internet RFC 6557. 4966 Update Internet RFCs 2445->5545, 2822->5322. 4967 Switch from FTP to HTTP for Internet RFCs. 4968 4969 4970 Release 2013a - 2013-02-27 09:20:35 -0800 4971 4972 Change affecting binary data format: 4973 4974 The zone offset at the end of version-2-format zone files is now 4975 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 4976 4977 Changes affecting current and future timestamps: 4978 4979 Chile's 2013 rules, and we guess rules for 2014 and later, will be 4980 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 4981 (Thanks to Steffen Thorsen and Robert Elz.) 4982 4983 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 4984 (Thanks to Tobias Conradi and Arthur David Olson.) 4985 4986 Many changes affect historical timestamps before 1940. 4987 These were deduced from: Milne J. Civil time. Geogr J. 1899 4988 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 4989 4990 Changes affecting the code: 4991 4992 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 4993 the data). (Thanks to Arthur David Olson.) 4994 4995 Fix localtime bug when time_t is unsigned and data files were generated 4996 by a signed time_t system. (Thanks to Doug Bailey for reporting and 4997 to Arthur David Olson for fixing.) 4998 4999 Allow the email address for bug reports to be set by the packager. 5000 The default is tz (a] iana.org, as before. (Thanks to Joseph S. Myers.) 5001 5002 Update HTML checking to be compatible with Ubuntu 12.10. 5003 5004 Check that files are a safe subset of ASCII. At some point we may 5005 relax this requirement to a safe subset of UTF-8. Without the 5006 check, some non-UTF-8 encodings were leaking into the distribution. 5007 5008 Commentary changes: 5009 5010 Restore a comment about copyright notices that was inadvertently deleted. 5011 (Thanks to Arthur David Olson.) 5012 5013 Improve the commentary about which districts observe what times 5014 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 5015 5016 Add web page links to tz.js. 5017 5018 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 5019 5020 5021 Release 2012j - 2012-11-12 18:34:49 -0800 5022 5023 Libya moved to CET this weekend, but with DST planned next year. 5024 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 5025 5026 Signatures now have the extension .asc, not .sign, as that's more 5027 standard. (Thanks to Phil Pennock.) 5028 5029 The output of 'zdump --version', and of 'zic --version', now 5030 uses a format that is more typical for --version. 5031 (Thanks to Joseph S. Myers.) 5032 5033 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 5034 now uses tz (a] iana.org rather than the old elsie address. 5035 5036 zic -v now complains about abbreviations that are less than 3 5037 or more than 6 characters, as per POSIX. Formerly, it checked 5038 for abbreviations that were more than 3. 5039 5040 'make public' no longer puts its temporary directory under /tmp, 5041 and uses the just-built zic rather than the system zic. 5042 5043 Various fixes to documentation and commentary. 5044 5045 5046 Release 2012i - 2012-11-03 12:57:09 -0700 5047 5048 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 5049 5050 Linker flags can now be specified via LDFLAGS. 5051 AWK now defaults to 'awk', not 'nawk'. 5052 The shell in tzselect now defaults to /bin/bash, but this can 5053 be overridden by specifying KSHELL. 5054 The main web page now mentions the unofficial GitHub repository. 5055 (Thanks to Mike Frysinger.) 5056 5057 Tarball signatures can now be built by running 'make signatures'. 5058 There are also new makefile rules 'tarballs', 'check_public', and 5059 separate makefile rules for each tarball and signature file. 5060 A few makefile rules are now more portable to strict POSIX. 5061 5062 The main web page now lists the canonical IANA URL. 5063 5064 5065 Release 2012h - 2012-10-26 22:49:10 -0700 5066 5067 Bahia no longer has DST. (Thanks to Kelley Cook.) 5068 5069 Tocantins has DST. (Thanks to Rodrigo Severo.) 5070 5071 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 5072 5073 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 5074 5075 Web page updates. 5076 5077 More C modernization, except that at Arthur David Olson's suggestion 5078 the instances of 'register' were kept. 5079 5080 5081 Release 2012g - 2012-10-17 20:59:45 -0700 5082 5083 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 5084 5085 Palestine fall 2012. (Thanks to Steffen Thorsen.) 5086 5087 Assume C89. 5088 5089 To attack the version-number problem, this release ships the file 5090 'Makefile' (which contains the release number) in both the tzcode and 5091 the tzdata tarballs. The two Makefiles are identical, and should be 5092 identical in any matching pair of tarballs, so it shouldn't matter 5093 which order you extract the tarballs. Perhaps we can come up with a 5094 better version-number scheme at some point; this scheme does have the 5095 virtue of not adding more files. 5096 5097 5098 Release 2012f - 2012-09-12 23:17:03 -0700 5099 5100 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 5101 20 this year. (Thanks to Steffen Thorsen.) 5102 5103 5104 Release 2012e - 2012-08-02 20:44:55 -0700 5105 5106 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 5107 (Thanks to Steffen Thorsen.) 5108 5109 * Use a single version number for both code and data. 5110 5111 * .gitignore: New file. 5112 5113 * Remove trailing white space. 5114 5115 5116 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 5117 5118 Changes for Morocco's timestamps, which take effect in a couple of 5119 hours, along with infrastructure changes to accommodate how the tz 5120 code and data are released on IANA. 5121 5122 5123 Release data2012c - 2012-03-27 12:17:25 -0400 5124 5125 africa 5126 Summer time changes for Morocco (to start late April 2012) 5127 5128 asia 5129 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 5130 5131 northamerica 5132 Haiti following US/Canada rules for 2012 (and we're assuming, 5133 for now anyway, for the future). 5134 5135 5136 Release 2012b - 2012-03-02 12:29:15 +0700 5137 5138 There is just one change to tzcode2012b (compared with 2012a): 5139 the Makefile that was accidentally included with 2012a has been 5140 replaced with the version that should have been there, which is 5141 identical with the previous version (from tzcode2011i). 5142 5143 There are just two changes in tzdata2012b compared with 2012a. 5144 5145 Most significantly, summer time in Cuba has been delayed 3 weeks 5146 (now starts April 1 rather than March 11). Since Mar 11 (the old start 5147 date, as listed in 2012a) is just a little over a week away, this 5148 change is urgent. 5149 5150 Less importantly, an excess tab in one of the changes in zone.tab 5151 in 2012a has been removed. 5152 5153 5154 Release 2012a - 2012-03-01 18:28:10 +0700 5155 5156 The changes in tzcode2012a (compared to the previous version, 2011i) 5157 are entirely to the README and tz-art.htm and tz-link.htm files, if 5158 none of those concern you, you can ignore the code update. The changes 5159 reflect the changed addresses for the mailing list and the code and 5160 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 5161 has been added to tz-link.htm). 5162 5163 In tzdata2012a (compared to the previous release, which was 2011n) 5164 the major changes are: 5165 Chile 2011/2012 and 2012/2013 summer time date adjustments. 5166 Falkland Islands onto permanent summer time (we're assuming for the 5167 foreseeable future, though 2012 is all we're fairly certain of.) 5168 Armenia has abolished Summer Time. 5169 Tokelau jumped the International Date Line back last December 5170 (just the same as their near neighbour, Samoa). 5171 America/Creston is a new zone for a small area of British Columbia 5172 There will be a leapsecond 2012-06-30 23:59:60 UTC. 5173 5174 Other minor changes are: 5175 Corrections to 1918 Canadian summer time end dates. 5176 Updated URL for UK time zone history (in comments) 5177 A few typos in Le Corre's list of free French place names (comments) 5178 5179 5180 Release data2011n - 2011-10-30 14:57:54 +0700 5181 5182 There are three changes of note - most urgently, Cuba (America/Havana) 5183 has extended summer time by two weeks, now to end on Nov 13, rather than 5184 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 5185 (Europe/Tiraspol) decided not to split from the rest of Moldova after 5186 all, and consequently that zone has been removed (again) and reinstated 5187 in the "backward" file as a link to Europe/Chisinau. And third, the 5188 end date for Fiji's summer time this summer was moved forward from the 5189 earlier planned Feb 26, to Jan 22. 5190 5191 Apart from that, Moldova (MD) returns to a single entry in zone.tab 5192 (and the incorrect syntax that was in the 2011m version of that file 5193 is so fixed - it would have been fixed in a different way had this 5194 change not happened - that's the "missing" sccs version id). 5195 5196 5197 Release data2011m - 2011-10-24 21:42:16 +0700 5198 5199 In particular, the typos in comments in the data (2011-11-17 should have 5200 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 5201 Tim Parenti noted) have been fixed, and the change for Ukraine has been 5202 made in all 4 Ukrainian zones, rather than just Europe/Kiev 5203 (again, thanks to Tim Parenti, and also Denys Gavrysh). 5204 5205 In addition, I added Europe/Tiraspol to zone.tab. 5206 5207 This time, all the files have new version numbers... (including the files 5208 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 5209 version numbers there...) 5210 5211 5212 Release data2011l - 2011-10-10 11:15:43 +0700 5213 5214 There are just 2 changes that cause different generated tzdata files from 5215 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 5216 is included, but commented out. Compared with the diff I sent out last week, 5217 this version also includes attributions for the sources for the changes 5218 (in much the same format as ado used, but the html tags have not been 5219 checked, verified, or used in any way at all, so if there are errors there, 5220 please let me know.) 5221 5222 5223 Release data2011k - 2011-09-20 17:54:03 -0400 5224 5225 [not summarized] 5226 5227 5228 Release data2011j - 2011-09-12 09:22:49 -0400 5229 5230 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 5231 Tanzania); there are also two spelling corrections to comments in 5232 the australasia file (with thanks to Christos Zoulas). 5233 5234 5235 Release 2011i - 2011-08-29 05:56:32 -0400 5236 5237 [not summarized] 5238 5239 5240 Release data2011h - 2011-06-15 18:41:48 -0400 5241 5242 Russia and Curaao changes 5243 5244 5245 Release 2011g - 2011-04-25 09:07:22 -0400 5246 5247 update the rules for Egypt to reflect its abandonment of DST this year 5248 5249 5250 Release 2011f - 2011-04-06 17:14:53 -0400 5251 5252 [not summarized] 5253 5254 5255 Release 2011e - 2011-03-31 16:04:38 -0400 5256 5257 Morocco, Chile, and tz-link changes 5258 5259 5260 Release 2011d - 2011-03-14 09:18:01 -0400 5261 5262 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 5263 5264 5265 Release 2011c - 2011-03-07 09:30:09 -0500 5266 5267 These do affect current timestamps in Chile and Annette Island, Canada. 5268 5269 5270 Release 2011b - 2011-02-07 08:44:50 -0500 5271 5272 [not summarized] 5273 5274 5275 Release 2011a - 2011-01-24 10:30:16 -0500 5276 5277 [not summarized] 5278 5279 5280 Release data2010o - 2010-11-01 09:18:23 -0400 5281 5282 change to the end of DST in Fiji in 2011 5283 5284 5285 Release 2010n - 2010-10-25 08:19:17 -0400 5286 5287 [not summarized] 5288 5289 5290 Release 2010m - 2010-09-27 09:24:48 -0400 5291 5292 Hong Kong, Vostok, and zic.c changes 5293 5294 5295 Release 2010l - 2010-08-16 06:57:25 -0400 5296 5297 [not summarized] 5298 5299 5300 Release 2010k - 2010-07-26 10:42:27 -0400 5301 5302 [not summarized] 5303 5304 5305 Release 2010j - 2010-05-10 09:07:48 -0400 5306 5307 changes for Baha de Banderas and for version naming 5308 5309 5310 Release data2010i - 2010-04-16 18:50:45 -0400 5311 5312 the end of DST in Morocco on 2010-08-08 5313 5314 5315 Release data2010h - 2010-04-05 09:58:56 -0400 5316 5317 [not summarized] 5318 5319 5320 Release data2010g - 2010-03-24 11:14:53 -0400 5321 5322 [not summarized] 5323 5324 5325 Release 2010f - 2010-03-22 09:45:46 -0400 5326 5327 [not summarized] 5328 5329 5330 Release data2010e - 2010-03-08 14:24:27 -0500 5331 5332 corrects the Dhaka bug found by Danvin Ruangchan 5333 5334 5335 Release data2010d - 2010-03-06 07:26:01 -0500 5336 5337 [not summarized] 5338 5339 5340 Release 2010c - 2010-03-01 09:20:58 -0500 5341 5342 changes including KRE's suggestion for earlier initialization of 5343 "goahead" and "goback" structure elements 5344 5345 5346 Release code2010a - 2010-02-16 10:40:04 -0500 5347 5348 [not summarized] 5349 5350 5351 Release data2010b - 2010-01-20 12:37:01 -0500 5352 5353 Mexico changes 5354 5355 5356 Release data2010a - 2010-01-18 08:30:04 -0500 5357 5358 changes to Dhaka 5359 5360 5361 Release data2009u - 2009-12-26 08:32:28 -0500 5362 5363 changes to DST in Bangladesh 5364 5365 5366 Release 2009t - 2009-12-21 13:24:27 -0500 5367 5368 [not summarized] 5369 5370 5371 Release data2009s - 2009-11-14 10:26:32 -0500 5372 5373 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 5374 5375 5376 Release 2009r - 2009-11-09 10:10:31 -0500 5377 5378 "antarctica" and "tz-link.htm" changes 5379 5380 5381 Release 2009q - 2009-11-02 09:12:40 -0500 5382 5383 with two corrections as reported by Eric Muller and Philip Newton 5384 5385 5386 Release data2009p - 2009-10-23 15:05:27 -0400 5387 5388 Argentina (including San Luis) changes (with the correction from 5389 Mariano Absatz) 5390 5391 5392 Release data2009o - 2009-10-14 16:49:38 -0400 5393 5394 Samoa (commentary only), Pakistan, and Bangladesh changes 5395 5396 5397 Release data2009n - 2009-09-22 15:13:38 -0400 5398 5399 added commentary for Argentina and a change to the end of DST in 5400 2009 in Pakistan 5401 5402 5403 Release data2009m - 2009-09-03 10:23:43 -0400 5404 5405 Samoa and Palestine changes 5406 5407 5408 Release data2009l - 2009-08-14 09:13:07 -0400 5409 5410 Samoa (comments only) and Egypt 5411 5412 5413 Release 2009k - 2009-07-20 09:46:08 -0400 5414 5415 [not summarized] 5416 5417 5418 Release data2009j - 2009-06-15 06:43:59 -0400 5419 5420 Bangladesh change (with a short turnaround since the DST change is 5421 impending) 5422 5423 5424 Release 2009i - 2009-06-08 09:21:22 -0400 5425 5426 updating for DST in Bangladesh this year 5427 5428 5429 Release 2009h - 2009-05-26 09:19:14 -0400 5430 5431 [not summarized] 5432 5433 5434 Release data2009g - 2009-04-20 16:34:07 -0400 5435 5436 Cairo 5437 5438 5439 Release data2009f - 2009-04-10 11:00:52 -0400 5440 5441 correct DST in Pakistan 5442 5443 5444 Release 2009e - 2009-04-06 09:08:11 -0400 5445 5446 [not summarized] 5447 5448 5449 Release 2009d - 2009-03-23 09:38:12 -0400 5450 5451 Morocco, Tunisia, Argentina, and American Astronomical Society changes 5452 5453 5454 Release data2009c - 2009-03-16 09:47:51 -0400 5455 5456 change to the start of Cuban DST 5457 5458 5459 Release 2009b - 2009-02-09 11:15:22 -0500 5460 5461 [not summarized] 5462 5463 5464 Release 2009a - 2009-01-21 10:09:39 -0500 5465 5466 [not summarized] 5467 5468 5469 Release data2008i - 2008-10-21 12:10:25 -0400 5470 5471 southamerica and zone.tab files, with Argentina DST rule changes and 5472 United States zone reordering and recommenting 5473 5474 5475 Release 2008h - 2008-10-13 07:33:56 -0400 5476 5477 [not summarized] 5478 5479 5480 Release 2008g - 2008-10-06 09:03:18 -0400 5481 5482 Fix a broken HTML anchor and update Brazil's DST transitions; 5483 there's also a slight reordering of information in tz-art.htm. 5484 5485 5486 Release data2008f - 2008-09-09 22:33:26 -0400 5487 5488 [not summarized] 5489 5490 5491 Release 2008e - 2008-07-28 14:11:17 -0400 5492 5493 changes by Arthur David Olson and Jesper Nrgaard Welen 5494 5495 5496 Release data2008d - 2008-07-07 09:51:38 -0400 5497 5498 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 5499 5500 5501 Release data2008c - 2008-05-19 17:48:03 -0400 5502 5503 Pakistan, Morocco, and Mongolia 5504 5505 5506 Release data2008b - 2008-03-24 08:30:59 -0400 5507 5508 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 5509 link provided 5510 5511 5512 Release 2008a - 2008-03-08 05:42:16 -0500 5513 5514 [not summarized] 5515 5516 5517 Release 2007k - 2007-12-31 10:25:22 -0500 5518 5519 most importantly, changes to the "southamerica" file based on 5520 Argentina's readoption of daylight saving time 5521 5522 5523 Release 2007j - 2007-12-03 09:51:01 -0500 5524 5525 1. eliminate the "P" (parameter) macro; 5526 5527 2. the "noncontroversial" changes circulated on the time zone 5528 mailing list (less the changes to "logwtmp.c"); 5529 5530 3. eliminate "too many transition" errors when "min" is used in time 5531 zone rules; 5532 5533 4. changes by Paul Eggert (including updated information for Venezuela). 5534 5535 5536 Release data2007i - 2007-10-30 10:28:11 -0400 5537 5538 changes for Cuba and Syria 5539 5540 5541 Release 2007h - 2007-10-01 10:05:51 -0400 5542 5543 changes by Paul Eggert, as well as an updated link to the ICU 5544 project in tz-link.htm 5545 5546 5547 Release 2007g - 2007-08-20 10:47:59 -0400 5548 5549 changes by Paul Eggert 5550 5551 The "leapseconds" file has been updated to incorporate the most 5552 recent International Earth Rotation and Reference Systems Service 5553 (IERS) bulletin. 5554 5555 There's an addition to tz-art.htm regarding the television show "Medium". 5556 5557 5558 Release 2007f - 2007-05-07 10:46:46 -0400 5559 5560 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 5561 Zealand) 5562 5563 changes to zic.c to allow hour values greater than 24 (along with 5564 Paul's improved time value overflow checking) 5565 5566 5567 Release 2007e - 2007-04-02 10:11:52 -0400 5568 5569 Syria and Honduras changes by Paul Eggert 5570 5571 zic.c variable renaming changes by Arthur David Olson 5572 5573 5574 Release 2007d - 2007-03-20 08:48:30 -0400 5575 5576 changes by Paul Eggert 5577 5578 the elimination of white space at the ends of lines 5579 5580 5581 Release 2007c - 2007-02-26 09:09:37 -0500 5582 5583 changes by Paul Eggert 5584 5585 5586 Release 2007b - 2007-02-12 09:34:20 -0500 5587 5588 Paul Eggert's proposed change to the quotation handling logic in zic.c. 5589 5590 changes to the commentary in "leapseconds" reflecting the IERS 5591 announcement that there is to be no positive leap second at the end 5592 of June 2007. 5593 5594 5595 Release 2007a - 2007-01-08 12:28:29 -0500 5596 5597 changes by Paul Eggert 5598 5599 Derick Rethans's Asmara change 5600 5601 Oscar van Vlijmen's Easter Island local mean time change 5602 5603 symbolic link changes 5604 5605 5606 Release 2006p - 2006-11-27 08:54:27 -0500 5607 5608 changes by Paul Eggert 5609 5610 5611 Release 2006o - 2006-11-06 09:18:07 -0500 5612 5613 changes by Paul Eggert 5614 5615 5616 Release 2006n - 2006-10-10 11:32:06 -0400 5617 5618 changes by Paul Eggert 5619 5620 5621 Release 2006m - 2006-10-02 15:32:35 -0400 5622 5623 changes for Uruguay, Palestine, and Egypt by Paul Eggert 5624 5625 (minimalist) changes to zic.8 to clarify "until" information 5626 5627 5628 Release data2006l - 2006-09-18 12:58:11 -0400 5629 5630 Paul's best-effort work on this coming weekend's Egypt time change 5631 5632 5633 Release 2006k - 2006-08-28 12:19:09 -0400 5634 5635 changes by Paul Eggert 5636 5637 5638 Release 2006j - 2006-08-21 09:56:32 -0400 5639 5640 changes by Paul Eggert 5641 5642 5643 Release code2006i - 2006-08-07 12:30:55 -0400 5644 5645 localtime.c fixes 5646 5647 Ken Pizzini's conversion script 5648 5649 5650 Release code2006h - 2006-07-24 09:19:37 -0400 5651 5652 adds public domain notices to four files 5653 5654 includes a fix for transition times being off by a second 5655 5656 adds a new recording to the "arts" file (information courtesy Colin Bowern) 5657 5658 5659 Release 2006g - 2006-05-08 17:18:09 -0400 5660 5661 northamerica changes by Paul Eggert 5662 5663 5664 Release 2006f - 2006-05-01 11:46:00 -0400 5665 5666 a missing version number problem is fixed (with thanks to Bradley 5667 White for catching the problem) 5668 5669 5670 Release 2006d - 2006-04-17 14:33:43 -0400 5671 5672 changes by Paul Eggert 5673 5674 added new items to tz-arts.htm that were found by Paul 5675 5676 5677 Release 2006c - 2006-04-03 10:09:32 -0400 5678 5679 two sets of data changes by Paul Eggert 5680 5681 a fencepost error fix in zic.c 5682 5683 changes to zic.c and the "europe" file to minimize differences 5684 between output produced by the old 32-bit zic and the new 64-bit 5685 version 5686 5687 5688 Release 2006b - 2006-02-20 10:08:18 -0500 5689 [tz32code2006b + tz64code2006b + tzdata2006b] 5690 5691 64-bit code 5692 5693 All SCCS IDs were bumped to "8.1" for this release. 5694 5695 5696 Release 2006a - 2006-01-30 08:59:31 -0500 5697 5698 changes by Paul Eggert (in particular, Indiana time zone moves) 5699 5700 an addition to the zic manual page to describe how special-case 5701 transitions are handled 5702 5703 5704 Release 2005r - 2005-12-27 09:27:13 -0500 5705 5706 Canadian changes by Paul Eggert 5707 5708 They also add "<pre>" directives to time zone data files and reflect 5709 changes to warning message logic in "zdump.c" (but with calls to 5710 "gettext" kept unbundled at the suggestion of Ken Pizzini). 5711 5712 5713 Release 2005q - 2005-12-13 09:17:09 -0500 5714 5715 Nothing earth-shaking here: 5716 1. Electronic mail addresses have been removed. 5717 2. Casts of the return value of exit have been removed. 5718 3. Casts of the argument of is.* macros have been added. 5719 4. Indentation in one section of zic.c has been fixed. 5720 5. References to dead URLs in the data files have been dealt with. 5721 5722 5723 Release 2005p - 2005-12-05 10:30:53 -0500 5724 5725 "systemv", "tz-link.htm", and "zdump.c" changes 5726 (less the casts of arguments to the is* macros) 5727 5728 5729 Release 2005o - 2005-11-28 10:55:26 -0500 5730 5731 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 5732 5733 zdump.c lint fixes by Arthur David Olson 5734 5735 5736 Release 2005n - 2005-10-03 09:44:09 -0400 5737 5738 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 5739 et al. changes) 5740 5741 5742 Release 2005m - 2005-08-29 12:15:40 -0400 5743 5744 changes by Paul Eggert (with a small tweak to the tz-art change) 5745 5746 a declaration of an unused variable has been removed from zdump.c 5747 5748 5749 Release 2005l - 2005-08-22 12:06:39 -0400 5750 5751 changes by Paul Eggert 5752 5753 overflow/underflow checks by Arthur David Olson, minus changes to 5754 the "Theory" file about the pending addition of 64-bit data (I grow 5755 less confident of the changes being accepted with each passing day, 5756 and the changes no longer increase the data files nine-fold--there's 5757 less than a doubling in size by my local Sun's reckoning) 5758 5759 5760 Release 2005k - 2005-07-14 14:14:24 -0400 5761 5762 The "leapseconds" file has been edited to reflect the recently 5763 announced leap second at the end of 2005. 5764 5765 I've also deleted electronic mail addresses from the files as an 5766 anti-spam measure. 5767 5768 5769 Release 2005j - 2005-06-13 14:34:13 -0400 5770 5771 These reflect changes to limit the length of time zone abbreviations 5772 and the characters used in those abbreviations. 5773 5774 There are also changes to handle POSIX-style "quoted" timezone 5775 environment variables. 5776 5777 The changes were circulated on the time zone mailing list; the only 5778 change since then was the removal of a couple of minimum-length of 5779 abbreviation checks. 5780 5781 5782 Release data2005i - 2005-04-21 15:04:16 -0400 5783 5784 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 5785 5786 5787 Release 2005h - 2005-04-04 11:24:47 -0400 5788 5789 changes by Paul Eggert 5790 5791 minor changes to Makefile and zdump.c to produce more useful output 5792 when doing a "make typecheck" 5793 5794 5795 Release 2005g - 2005-03-14 10:11:21 -0500 5796 5797 changes by Paul Eggert (a change to current DST rules in Uruguay and 5798 an update to a link to time zone software) 5799 5800 5801 Release 2005f - 2005-03-01 08:45:32 -0500 5802 5803 data and documentation changes by Paul Eggert 5804 5805 5806 Release 2005e - 2005-02-10 15:59:44 -0500 5807 5808 [not summarized] 5809 5810 5811 Release code2005d - 2005-01-31 09:21:47 -0500 5812 5813 make zic complain about links to links if the -v flag is used 5814 5815 have "make public" do more code checking 5816 5817 add an include to "localtime.c" for the benefit of gcc systems 5818 5819 5820 Release 2005c - 2005-01-17 18:36:29 -0500 5821 5822 get better results when mktime runs on a system where time_t is double 5823 5824 changes to the data files (most importantly to Paraguay) 5825 5826 5827 Release 2005b - 2005-01-10 09:19:54 -0500 5828 5829 Get localtime and gmtime working on systems with exotic time_t types. 5830 5831 Update the leap second commentary in the "leapseconds" file. 5832 5833 5834 Release 2005a - 2005-01-01 13:13:44 -0500 5835 5836 [not summarized] 5837 5838 5839 Release code2004i - 2004-12-14 13:42:58 -0500 5840 5841 Deal with systems where time_t is unsigned. 5842 5843 5844 Release code2004h - 2004-12-07 11:40:18 -0500 5845 5846 64-bit-time_t changes 5847 5848 5849 Release 2004g - 2004-11-02 09:06:01 -0500 5850 5851 update to Cuba (taking effect this weekend) 5852 5853 other changes by Paul Eggert 5854 5855 correction of the spelling of Oslo 5856 5857 changed versions of difftime.c and private.h 5858 5859 5860 Release code2004f - 2004-10-21 10:25:22 -0400 5861 5862 Cope with wide-ranging tm_year values. 5863 5864 5865 Release 2004e - 2004-10-11 14:47:21 -0400 5866 5867 Brazil/Argentina/Israel changes by Paul Eggert 5868 5869 changes to tz-link.htm by Paul 5870 5871 one small fix to Makefile 5872 5873 5874 Release 2004d - 2004-09-22 08:27:29 -0400 5875 5876 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 5877 5878 5879 Release 2004c - 2004-08-11 12:06:26 -0400 5880 5881 asctime-related changes 5882 5883 (variants of) some of the documentation changes suggested by Paul Eggert 5884 5885 5886 Release 2004b - 2004-07-19 14:33:35 -0400 5887 5888 data changes by Paul Eggert - most importantly, updates for Argentina 5889 5890 5891 Release 2004a - 2004-05-27 12:00:47 -0400 5892 5893 changes by Paul Eggert 5894 5895 Handle DST transitions that occur at the end of a month in some 5896 years but at the start of the following month in other years. 5897 5898 Add a copy of the correspondence that's the basis for claims about 5899 DST in the Navajo Nation. 5900 5901 5902 Release 2003e - 2003-12-15 09:36:47 -0500 5903 5904 changes by Arthur David Olson (primarily code changes) 5905 5906 changes by Paul Eggert (primarily data changes) 5907 5908 minor changes to "Makefile" and "northamerica" (in the latter case, 5909 optimization of the "Toronto" rules) 5910 5911 5912 Release 2003d - 2003-10-06 09:34:44 -0400 5913 5914 changes by Paul Eggert 5915 5916 5917 Release 2003c - 2003-09-16 10:47:05 -0400 5918 5919 Fix bad returns in zic.c's inleap function. 5920 Thanks to Bradley White for catching the problem! 5921 5922 5923 Release 2003b - 2003-09-16 07:13:44 -0400 5924 5925 Add a "--version" option (and documentation) to the zic and zdump commands. 5926 5927 changes to overflow/underflow checking in zic 5928 5929 a localtime typo fix. 5930 5931 Update the leapseconds and tz-art.htm files. 5932 5933 5934 Release 2003a - 2003-03-24 09:30:54 -0500 5935 5936 changes by Paul Eggert 5937 5938 a few additions and modifications to the tz-art.htm file 5939 5940 5941 Release 2002d - 2002-10-15 13:12:42 -0400 5942 5943 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 5944 5945 There's also a new time zone quote in "tz-art.htm". 5946 5947 5948 Release 2002c - 2002-04-04 11:55:20 -0500 5949 5950 changes by Paul Eggert 5951 5952 Change zic.c to avoid creating symlinks to files that don't exist. 5953 5954 5955 Release 2002b - 2002-01-28 12:56:03 -0500 5956 5957 [These change notes are for Release 2002a, which was corrupted. 5958 2002b was a corrected version of 2002a.] 5959 5960 changes by Paul Eggert 5961 5962 Update the "leapseconds" file to note that there'll be no leap 5963 second at the end of June, 2002. 5964 5965 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 5966 5967 Change to "difftime.c" to avoid sizeof problems. 5968 5969 5970 Release 2001d - 2001-10-09 13:31:32 -0400 5971 5972 changes by Paul Eggert 5973 5974 5975 Release 2001c - 2001-06-05 13:59:55 -0400 5976 5977 changes by Paul Eggert and Andrew Brown 5978 5979 5980 Release 2001b - 2001-04-05 16:44:38 -0400 5981 5982 changes by Paul Eggert (modulo jnorgard's typo fix) 5983 5984 tz-art.htm has been HTMLified. 5985 5986 5987 Release 2001a - 2001-03-13 12:57:44 -0500 5988 5989 changes by Paul Eggert 5990 5991 An addition to the "leapseconds" file: comments with the text of the 5992 latest IERS leap second notice. 5993 5994 Trailing white space has been removed from data file lines, and 5995 repeated spaces in "Rule Jordan" lines in the "asia" file have been 5996 converted to tabs. 5997 5998 5999 Release 2000h - 2000-12-14 15:33:38 -0500 6000 6001 changes by Paul Eggert 6002 6003 one typo fix in the "art" file 6004 6005 With providence, this is the last update of the millennium. 6006 6007 6008 Release 2000g - 2000-10-10 11:35:22 -0400 6009 6010 changes by Paul Eggert 6011 6012 correction of John Mackin's name submitted by Robert Elz 6013 6014 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 6015 Emmy Awards broadcast. 6016 6017 6018 Release 2000f - 2000-08-10 09:31:58 -0400 6019 6020 changes by Paul Eggert 6021 6022 Added information in "tz-art.htm" on a Seinfeld reference to DST. 6023 6024 Error checking and messages in the "yearistype" script have been 6025 improved. 6026 6027 6028 Release 2000e - 2000-07-31 09:27:54 -0400 6029 6030 data changes by Paul Eggert 6031 6032 a change to the default value of the defined constant HAVE_STRERROR 6033 6034 the addition of a Dave Barry quote on DST to the tz-arts file 6035 6036 6037 Release 2000d - 2000-04-20 15:43:04 -0400 6038 6039 changes to the documentation and code of strftime for C99 conformance 6040 6041 a bug fix for date.c 6042 6043 These are based on (though modified from) changes by Paul Eggert. 6044 6045 6046 Release 2000c - 2000-03-04 10:31:43 -0500 6047 6048 changes by Paul Eggert 6049 6050 6051 Release 2000b - 2000-02-21 12:16:29 -0500 6052 6053 changes by Paul Eggert and Joseph Myers 6054 6055 modest tweaks to the tz-art.htm and tz-link.htm files 6056 6057 6058 Release 2000a - 2000-01-18 09:21:26 -0500 6059 6060 changes by Paul Eggert 6061 6062 The two hypertext documents have also been renamed. 6063 6064 6065 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 6066 6067 Paul Eggert's changes 6068 6069 additions to the "zic" manual page and the "Arts.htm" file 6070 6071 6072 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 6073 6074 [not summarized] 6075 6076 6077 Release data1999h - 1999-10-07 03:50:29 -0400 6078 6079 changes by Paul Eggert to "europe" (most importantly, fixing 6080 Lithuania and Estonia) 6081 6082 6083 Release 1999g - 1999-09-28 11:06:18 -0400 6084 6085 data changes by Paul Eggert (most importantly, the change for 6086 Lebanon that buys correctness for this coming Sunday) 6087 6088 The "code" file contains changes to "Makefile" and "checktab.awk" to 6089 allow better checking of time zone files before they are published. 6090 6091 6092 Release 1999f - 1999-09-23 09:48:14 -0400 6093 6094 changes by Arthur David Olson and Paul Eggert 6095 6096 6097 Release 1999e - 1999-08-17 15:20:54 -0400 6098 6099 changes circulated by Paul Eggert, although the change to handling 6100 of DST-specifying timezone names has been commented out for now 6101 (search for "XXX" in "localtime.c" for details). These files also 6102 do not make any changes to the start of DST in Brazil. 6103 6104 In addition to Paul's changes, there are updates to "Arts.htm" and 6105 cleanups of URLs. 6106 6107 6108 Release 1999d - 1999-03-30 11:31:07 -0500 6109 6110 changes by Paul Eggert 6111 6112 The Makefile's "make public" rule has also been changed to do a test 6113 compile of each individual time zone data file (which should help 6114 avoid problems such as the one we had with Nicosia). 6115 6116 6117 Release 1999c - 1999-03-25 09:47:47 -0500 6118 6119 changes by Paul Eggert, most importantly the change for Chile. 6120 6121 6122 Release 1999b - 1999-02-01 17:51:44 -0500 6123 6124 changes by Paul Eggert 6125 6126 code changes (suggested by Mani Varadarajan, mani at be.com) for 6127 correct handling of symbolic links when building using a relative directory 6128 6129 code changes to generate correct messages for failed links 6130 6131 updates to the URLs in Arts.htm 6132 6133 6134 Release 1999a - 1999-01-19 16:20:29 -0500 6135 6136 error message internationalizations and corrections in zic.c and 6137 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 6138 to whom thanks!) 6139 6140 6141 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 6142 6143 changes for Brazil, Chile, and Germany 6144 6145 support for use of "24:00" in the input files for the time zone compiler 6146 6147 6148 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 6149 6150 changes by Paul Eggert 6151 6152 correction to a define in the "private.h" file 6153 6154 6155 Release data1998g - 1998-08-11 03:28:35 -0000 6156 [tzdata1998g.tar.gz is missing!] 6157 6158 Lithuanian change provided by mgedmin at pub.osf.it 6159 6160 Move creation of the GMT link with Etc/GMT to "etcetera" (from 6161 "backward") to ensure that the GMT file is created even where folks 6162 don't want the "backward" links (as suggested by Paul Eggert). 6163 6164 6165 Release data1998f - 1998-07-20 13:50:00 -0000 6166 [tzdata1998f.tar.gz is missing!] 6167 6168 Update the "leapseconds" file to include the newly announced 6169 insertion at the end of 1998. 6170 6171 6172 Release code1998f - 1998-06-01 10:18:31 -0400 6173 6174 addition to localtime.c by Guy Harris 6175 6176 6177 Release 1998e - 1998-05-28 09:56:26 -0400 6178 6179 The Makefile is changed to produce zoneinfo-posix rather than 6180 zoneinfo/posix, and to produce zoneinfo-leaps rather than 6181 zoneinfo/right. 6182 6183 data changes by Paul Eggert 6184 6185 changes from Guy Harris to provide asctime_r and ctime_r 6186 6187 A usno1998 file (substantially identical to usno1997) has been added. 6188 6189 6190 Release 1998d - 1998-05-14 11:58:34 -0400 6191 6192 changes to comments (in particular, elimination of references to CIA maps). 6193 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 6194 where changes occur. 6195 6196 6197 Release 1998c - 1998-02-28 12:32:26 -0500 6198 6199 changes by Paul Eggert (save the "French correction," on which I'll 6200 wait for the dust to settle) 6201 6202 symlink changes 6203 6204 changes and additions to Arts.htm 6205 6206 6207 Release 1998b - 1998-01-17 14:31:51 -0500 6208 6209 URL cleanups and additions 6210 6211 6212 Release 1998a - 1998-01-13 12:37:35 -0500 6213 6214 changes by Paul Eggert 6215 6216 6217 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 6218 6219 changes by Paul Eggert, with minor modifications from Arthur David 6220 Olson to make the files more browser friendly 6221 6222 6223 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 6224 6225 minor changes to put "TZif" at the start of each timezone information file 6226 6227 a rule has also been added to the Makefile so you can 6228 make zones 6229 to just recompile the zone information files (rather than doing a 6230 full "make install" with its other effects). 6231 6232 6233 Release data1997i - 1997-10-07 08:45:38 -0400 6234 6235 changes to Africa by Paul Eggert 6236 6237 6238 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 6239 6240 corrections for Uruguay (and other locations) 6241 6242 Arthur David Olson's simple-minded fix allowing mktime to both 6243 correctly handle leap seconds and correctly handle tm_sec values 6244 upon which arithmetic has been performed. 6245 6246 6247 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 6248 6249 Paul Eggert's updates 6250 6251 a small change to a function prototype; 6252 6253 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 6254 include information on Around the World in Eighty Days. 6255 6256 6257 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 6258 6259 fixes to zic's error handling 6260 6261 changes inspired by the item circulated on Slovenia 6262 6263 The description of Web resources has been HTMLified for browsing 6264 convenience. 6265 6266 A new piece of tz-related music has been added to the "Music" file. 6267 6268 6269 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 6270 6271 Paul Eggert's latest suggestions 6272 6273 6274 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 6275 6276 changes to "zic.c" to correct performance of the "-s" option 6277 6278 a new file "usno1997" 6279 6280 6281 Release data1997c - 1997-03-04 09:58:18 -0500 6282 6283 changes in Israel 6284 6285 6286 Release 1997b - 1997-02-27 18:34:19 -0500 6287 6288 The data file incorporates the 1997 leap second. 6289 6290 The code file incorporates Arthur David Olson's take on the 6291 zic/multiprocessor/directory-creation situation. 6292 6293 6294 Release 1997a - 1997-01-21 09:11:10 -0500 6295 6296 Paul Eggert's Antarctica (and other changes) 6297 6298 Arthur David Olson finessed the "getopt" issue by checking against 6299 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 6300 is returned while SunOS 5.5's manual says EOF is returned). 6301 6302 6303 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 6304 6305 Paul Eggert's latest changes 6306 6307 6308 Release code1996n - 1996-12-16 09:42:02 -0500 6309 6310 link snapping fix from Bruce Evans (via Garrett Wollman) 6311 6312 6313 Release data1996m - 1996-11-24 02:37:34 -0000 6314 [tzdata1996m.tar.gz is missing!] 6315 6316 Paul Eggert's batch of changes 6317 6318 6319 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 6320 6321 No functional changes here; the files have simply been changed to 6322 make more use of ISO style dates in comments. The names of the above 6323 files now include the year in full. 6324 6325 6326 Release code96l - 1996-09-08 17:12:20 -0400 6327 6328 tzcode96k was missing a couple of pieces. 6329 6330 6331 Release 96k - 1996-09-08 16:06:22 -0400 6332 6333 the latest round of changes from Paul Eggert 6334 6335 the recent Year 2000 material 6336 6337 6338 Release code96j - 1996-07-30 13:18:53 -0400 6339 6340 Set sp->typecnt as suggested by Timothy Patrick Murphy. 6341 6342 6343 Release code96i - 1996-07-27 20:11:35 -0400 6344 6345 Paul's suggested patch for strftime %V week numbers 6346 6347 6348 Release data96i - 1996-07-01 18:13:04 -0400 6349 6350 "northamerica" and "europe" changes by Paul Eggert 6351 6352 6353 Release code96h - 1996-06-05 08:02:21 -0400 6354 6355 fix for handling transitions specified in Universal Time 6356 6357 Some "public domain" notices have also been added. 6358 6359 6360 Release code96g - 1996-05-16 14:00:26 -0400 6361 6362 fix for the simultaneous-DST-and-zone-change challenge 6363 6364 6365 Release data96h - 1996-05-09 17:40:51 -0400 6366 6367 changes by Paul Eggert 6368 6369 6370 Release code96f-data96g - 1996-05-03 03:09:59 -0000 6371 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 6372 6373 The changes get us some of the way to fixing the problems noted in Paul 6374 Eggert's letter yesterday (in addition to a few others). The approach 6375 has been to make zic a bit smarter about figuring out what time zone 6376 abbreviations apply just after the time specified in the "UNTIL" part 6377 of a zone line. Putting the smarts in zic means avoiding having 6378 transition times show up in both "Zone" lines and "Rule" lines, which 6379 in turn avoids multiple transition time entries in time zone files. 6380 (This also makes the zic input files such as "europe" a bit shorter and 6381 should ease maintenance.) 6382 6383 6384 Release data96f - 1996-04-19 19:20:03 -0000 6385 [tzdata96f.tar.gz is missing!] 6386 6387 The only changes are to the "northamerica" file; the time zone 6388 abbreviation for Denver is corrected to MST (and MDT), and the 6389 comments for Mexico have been updated. 6390 6391 6392 Release data96e - 1996-03-19 17:37:26 -0500 6393 6394 Proposals by Paul Eggert, in particular the Portugal change that 6395 comes into play at the end of this month. 6396 6397 6398 Release data96d - 1996-03-18 20:49:39 -0500 6399 6400 [not summarized] 6401 6402 6403 Release code96e - 1996-02-29 15:43:27 -0000 6404 [tzcode96e.tar.gz is missing!] 6405 6406 internationalization changes and the fix to the documentation for strftime 6407 6408 6409 Release code96d-data96c - 1996-02-12 11:05:27 -0500 6410 6411 The "code" file simply updates Bob Kridle's electronic address. 6412 6413 The "data" file updates rules for Mexico. 6414 6415 6416 Release data96b - 1996-01-27 15:44:42 -0500 6417 6418 Kiribati change 6419 6420 6421 Release code96c - 1996-01-16 16:58:15 -0500 6422 6423 leap-year streamlining and binary-search changes 6424 6425 fix to newctime.3 6426 6427 6428 Release code96b - 1996-01-10 20:42:39 -0500 6429 6430 fixes and enhancements from Paul Eggert, including code that 6431 emulates the behavior of recent versions of the SunOS "date" 6432 command. 6433 6434 6435 Release 96a - 1996-01-06 09:08:24 -0500 6436 6437 Israel updates 6438 6439 fixes to strftime.c for correct ISO 8601 week number generation, 6440 plus support for two new formats ('G' and 'g') to give ISO 8601 year 6441 numbers (which are not necessarily the same as calendar year numbers) 6442 6443 6444 Release code95i-data95m - 1995-12-21 12:46:47 -0500 6445 6446 The latest revisions from Paul Eggert are included, the usno1995 6447 file has been updated, and a new file ("WWW") covering useful URLs 6448 has been added. 6449 6450 6451 Release code95h-data95l - 1995-12-19 18:10:12 -0500 6452 6453 A simplification of a macro definition, a change to data for Sudan, 6454 and (for last minute shoppers) notes in the "Music" file on the CD 6455 "Old Man Time". 6456 6457 6458 Release code95g-data95k - 1995-10-30 10:32:47 -0500 6459 6460 (slightly reformatted) 8-bit-clean proposed patch 6461 6462 minor patch: US/Eastern -> America/New_York 6463 6464 snapshot of the USNO's latest data ("usno1995") 6465 6466 some other minor cleanups 6467 6468 6469 Release code95f-data95j - 1995-10-28 21:01:34 -0000 6470 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 6471 6472 European cleanups 6473 6474 support for 64-bit time_t's 6475 6476 optimization in localtime.c 6477 6478 6479 Release code95e - 1995-10-13 13:23:57 -0400 6480 6481 the mktime change to scan from future to past when trying to find time zone 6482 offsets 6483 6484 6485 Release data95i - 1995-09-26 10:43:26 -0400 6486 6487 For Canada/Central, guess that the Sun customer's "one week too 6488 early" was just a approximation, and the true error is one month 6489 too early. This is consistent with the rest of Canada. 6490 6491 6492 Release data95h - 1995-09-21 11:26:48 -0400 6493 6494 latest changes from Paul Eggert 6495 6496 6497 Release code95d - 1995-09-14 11:14:45 -0400 6498 6499 the addition of a "Music" file, which documents four recorded 6500 versions of the tune "Save That Time". 6501 6502 6503 Release data95g - 1995-09-01 17:21:36 -0400 6504 6505 "yearistype" correction 6506 6507 6508 Release data95f - 1995-08-28 20:46:56 -0400 6509 6510 Paul Eggert's change to the australasia file 6511 6512 6513 Release data95e - 1995-07-08 18:02:34 -0400 6514 6515 The only change is a leap second at the end of this year. 6516 Thanks to Bradley White for forwarding news on the leap second. 6517 6518 6519 Release data95d - 1995-07-03 13:26:22 -0400 6520 6521 Paul Eggert's changes 6522 6523 6524 Release data95c - 1995-07-02 19:19:28 -0400 6525 6526 changes to "asia", "backward", "europe", and "southamerica" 6527 (read: northamericacentrics need not apply) 6528 6529 6530 Release code95c - 1995-03-13 14:00:46 -0500 6531 6532 one-line fix for sign extension problems in detzcode 6533 6534 6535 Release 95b - 1995-03-04 11:22:38 -0500 6536 6537 Minor changes in both: 6538 6539 The "code" file contains a workaround for the lack of "unistd.h" in 6540 Microsoft C++ version 7. 6541 6542 The "data" file contains a fixed "Link" for America/Shiprock. 6543 6544 6545 Release 94h - 1994-12-10 12:51:14 -0500 6546 6547 The files: 6548 6549 * incorporate the changes to "zdump" and "date" to make changes to 6550 the "TZ" environment variable permanent; 6551 6552 * incorporate the table changes by Paul Eggert; 6553 6554 * include (and document) support for universal time specifications in 6555 data files - but do not (yet) include use of this feature in the 6556 data files. 6557 6558 Think of this as "TZ Classic" - the software has been set up not to break if 6559 universal time shows up in its input, and data entries have been 6560 left as is so as not to break existing implementations. 6561 6562 6563 Release data94f - 1994-08-20 12:56:09 -0400 6564 6565 (with thanks!) the latest data updates from Paul Eggert 6566 6567 6568 Release data94e - 1994-06-04 13:13:53 -0400 6569 6570 [not summarized] 6571 6572 6573 Release code94g - 1994-05-05 12:14:07 -0400 6574 6575 fix missing "optind.c" and a reference to it in the Makefile 6576 6577 6578 Release code94f - 1994-05-05 13:00:33 -0000 6579 [tzcode94f.tar.gz is missing!] 6580 6581 changes to avoid overflow in difftime, as well as changes to cope 6582 with the 52/53 challenge in strftime 6583 6584 6585 Release code94e - 1994-03-30 23:32:59 -0500 6586 6587 change for the benefit of PCTS 6588 6589 6590 Release 94d - 1994-02-24 15:42:25 -0500 6591 6592 Avoid clashes with POSIX semantics for zones such as GMT+4. 6593 6594 Some other very minor housekeeping is also present. 6595 6596 6597 Release code94c - 1994-02-10 08:52:40 -0500 6598 6599 Fix bug where mkdirs was broken unless you compile with 6600 -fwritable-strings (which is generally losing to do). 6601 6602 6603 Release 94b - 1994-02-07 10:04:33 -0500 6604 6605 work by Paul Eggert who notes: 6606 6607 I found another book of time zone histories by E W Whitman; it's not 6608 as extensive as Shanks but has a few goodies of its own. I used it 6609 to update the tables. I also fixed some more as a result of 6610 correspondence with Adam David and Peter Ilieve, and move some stray 6611 links from 'europe' to 'backward'. I corrected some scanning errors 6612 in usno1989. 6613 6614 As far as the code goes, I fixed zic to allow years in the range 6615 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 6616 And I cleaned up the zic documentation a little bit. 6617 6618 6619 Release data94a - 1994-02-03 08:58:54 -0500 6620 6621 It simply incorporates the recently announced leap second into the 6622 "leapseconds" file. 6623 6624 6625 Release 93g - 1993-11-22 17:28:27 -0500 6626 6627 Paul Eggert has provided a good deal of historic information (based 6628 on Shanks), and there are some code changes to deal with the buglets 6629 that crawled out in dealing with the new information. 6630 6631 6632 Release 93f - 1993-10-15 12:27:46 -0400 6633 6634 Paul Eggert's changes 6635 6636 6637 Release 93e - 1993-09-05 21:21:44 -0400 6638 6639 This has updated data for Israel, England, and Kwajalein. There's 6640 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 6641 Thanks to Paul Eggert and Peter Ilieve for the changes. 6642 6643 6644 Release 93d - 1993-06-17 23:34:17 -0400 6645 6646 new fix and new data on Israel 6647 6648 6649 Release 93c - 1993-06-06 19:31:55 -0400 6650 6651 [not summarized] 6652 6653 6654 Release 93b - 1993-02-02 14:53:58 -0500 6655 6656 updated "leapseconds" file 6657 6658 6659 Release 93 - 1993-01-08 07:01:06 -0500 6660 6661 At kre's suggestion, the package has been split in two - a code piece 6662 (which also includes documentation) that's only of use to folks who 6663 want to recompile things and a data piece useful to anyone who can 6664 run "zic". 6665 6666 The new version has a few changes to the data files, a few 6667 portability changes, and an off-by-one fix (with thanks to 6668 Tom Karzes at deshaw.com for providing a description and a 6669 solution). 6670 6671 6672 Release 92c - 1992-11-21 17:35:36 -0000 6673 [tz92c.tar.Z is missing!] 6674 6675 The fallout from the latest round of DST transitions. 6676 6677 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 6678 there's also a change to "zic.c" that makes it portable to more systems. 6679 6680 6681 Release 92 - 1992-04-25 18:17:03 -0000 6682 [tz92.tar.Z is missing!] 6683 6684 By popular demand (well, at any rate, following a request by kre at munnari) 6685 6686 6687 The 1989 update of the time zone package featured: 6688 6689 * POSIXization (including interpretation of POSIX-style TZ environment 6690 variables, provided by Guy Harris), 6691 * ANSIfication (including versions of "mktime" and "difftime"), 6692 * SVIDulation (an "altzone" variable) 6693 * MACHination (the "gtime" function) 6694 * corrections to some time zone data (including corrections to the rules 6695 for Great Britain and New Zealand) 6696 * reference data from the United States Naval Observatory for folks who 6697 want to do additional time zones 6698 * and the 1989 data for Saudi Arabia. 6699 6700 (Since this code will be treated as "part of the implementation" in some 6701 places and as "part of the application" in others, there's no good way to 6702 name functions, such as timegm, that are not part of the proposed ANSI C 6703 standard; such functions have kept their old, underscore-free names in this 6704 update.) 6705 6706 And the "dysize" function has disappeared; it was present to allow 6707 compilation of the "date" command on old BSD systems, and a version of "date" 6708 is now provided in the package. The "date" command is not created when you 6709 "make all" since it may lack options provided by the version distributed with 6710 your operating system, or may not interact with the system in the same way 6711 the native version does. 6712 6713 Since POSIX frowns on correct leap second handling, the default behavior of 6714 the "zic" command (in the absence of a "-L" option) has been changed to omit 6715 leap second information from its output files. 6716 6717 6718 ----- 6719 Notes 6720 6721 This file contains copies of the part of each release announcement 6722 that talks about the changes in that release. The text has been 6723 adapted and reformatted for the purposes of this file. 6724 6725 Traditionally a release R consists of a pair of tarball files, 6726 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 6727 code2010a, data2012c) consist of just one or the other tarball, and a 6728 few (e.g., code2012c-data2012d) have tarballs with mixed version 6729 numbers. Recent releases also come in an experimental format 6730 consisting of a single tarball tzdb-R.tar.lz with extra data. 6731 6732 A releases timestamp is taken from the releases commit (for newer, 6733 Git-based releases), from the newest file in the tarball (for older 6734 releases, where this info is available) or from the email announcing 6735 the release (if all else fails; these are marked with a time zone 6736 abbreviation of -0000 and an "is missing!" comment). 6737 6738 Earlier versions of the code and data were not announced on the tz 6739 list and are not summarized here. 6740 6741 This file is in the public domain. 6742 6743 Local Variables: 6744 coding: utf-8 6745 End: 6746
Indexes created Sun Aug 16 00:25:19 UTC 2026