NEWS revision 1.7
1 News for the tz database 2 3 Release 2026b - 2026-04-22 23:06:43 -0700 4 5 Briefly: 6 British Columbia moved to permanent -07 on 2026-03-09. 7 Some more overflow bugs have been fixed in zic. 8 9 Changes to future timestamps 10 11 British Columbias 2026-03-08 spring forward was its last 12 foreseeable clock change, as it moved to permanent -07 thereafter. 13 (Thanks to Arthur David Olson.) Although the change to permanent 14 -07 legally took place on 2026-03-09, temporarily model the change 15 to occur on 2026-11-01 at 02:00 instead. This works around a 16 limitation in CLDR v48.2 (2026-03-17). This temporary hack is 17 planned to be removed after CLDR is fixed. 18 19 Changes to code 20 21 zic no longer mishandles a last transition to a new time type. 22 23 zic no longer overflows a buffer when generating a TZ string like 24 "PST-167:59:58PDT-167:59:59,M11.5.6/-167:59:59,M12.5.6/-167:59:59", 25 which can occur with adversarial input. (Thanks to Naveed Khan.) 26 27 zic no longer generates a longer TZif file than necessary when 28 an earlier time zone abbreviation is a suffix of a later one. 29 As a nice side effect, zic no longer overflows a buffer when given 30 a long series of abbreviations, each a suffix of the next. 31 (Buffer overflow reported by Arthur Chan.) 32 33 zic no longer overflows an int when processing input like Zone 34 Ouch 2147483648:00:00 - LMT. The int overflow can lead to buffer 35 overflow in adversarial cases. (Thanks to Naveed Khan.) 36 37 zic now checks for signals more often. 38 39 40 Release 2026a - 2026-03-01 22:59:49 -0800 41 42 Briefly: 43 Moldova has used EU transition times since 2022. 44 The right TZif files are no longer installed by default. 45 -DTZ_RUNTIME_LEAPS=0 disables runtime support for leap seconds. 46 TZif files are no longer limited to 50 bytes of abbreviations. 47 zic is no longer limited to 50 leap seconds. 48 Several integer overflow bugs have been fixed. 49 50 Changes to past and future timestamps 51 52 Since 2022 Moldova has observed EU transition times, that is, it 53 has sprung forward at 03:00, not 02:00, and has fallen back at 54 04:00, not 03:00. (Thanks to Heitor David Pinto.) 55 56 Changes to data 57 58 Remove Europe/Chisinau from zonenow.tab, as it now agrees with 59 Europe/Athens for future timestamps. 60 61 Changes to build procedure 62 63 The Makefile no longer by default installs an alternate set 64 of TZif files for system clocks that count leap seconds. 65 Install with make REDO=posix_right to get the old default, 66 which is rarely used in major downstream distributions. 67 If your system clock counts leap seconds (contrary to POSIX), 68 it is better to install with make REDO=right_only. 69 This change does not affect the leapseconds file, which is still 70 installed as before. 71 72 The Makefiles POSIXRULES option, which was declared obsolete in 73 release 2019b, has been removed. The Makefiles build procedure 74 thus no longer optionally installs the obsolete posixrules file. 75 76 Changes to code 77 78 Compiling with the new option -DTZ_RUNTIME_LEAPS=0 disables 79 runtime support for leap seconds. Although this conforms to 80 POSIX, shrinks tzcodes attack surface, and is more efficient, 81 it fails to support Internet RFC 9636s leap seconds. 82 83 zic now can generate, and localtime.c can now use, TZif files that 84 hold up to 256 bytes of abbreviations, counting trailing NULs. 85 The previous limit was 50 bytes, and some tzdata TZif files were 86 already consuming 40 bytes. zic -v warns if it generates a file 87 that exceeds the old 50-byte limit. 88 89 zic -L can now generate TZif files with more than 50 leap seconds. 90 This helps test TZif readers not limited to 50 leap seconds, as 91 tzcodes localtime.c is; it has little immediate need for 92 practical timekeeping as there have been only 27 leap seconds and 93 possibly there will be no more, due to planned changes to UTC. 94 zic -v warns if its output exceeds the old 50-second limit. 95 96 localtime.c no longer accesses the posixrules file generated by 97 zic -p. Hence for obsolete and nonconforming settings like 98 TZ="AST4ADT" it now typically falls back on US DST rules, rather 99 than attempting to override this fallback with the contents of the 100 posixrules file. This removes library support that was declared 101 obsolete in release 2019b, and fixes some undefined behavior. 102 (Undefined behavior reported by GitHub user Naveed8951.) 103 104 The posix2time, posix2time_z, time2posix, and time2posix_z 105 functions now set errno=EOVERFLOW and return ((time_t) -1) if the 106 result is not representable. Formerly they had undefined behavior 107 that could in practice result in crashing, looping indefinitely, 108 or returning an incorrect result. As before, these functions are 109 defined only when localtime.c is compiled with the -DSTD_INSPIRED 110 option. 111 112 Some other undefined behavior, triggered by TZif files containing 113 outlandish but conforming UT offsets or leap second corrections, 114 has also been fixed. (Some of these bugs reported by Naveed8951.) 115 116 localtime.c no longer rejects TZif files that exactly fit in its 117 internal structures, fixing off-by-one typos introduced in 2014g. 118 119 zic no longer generates a no-op transition when 120 simultaneous Rule and Zone changes cancel each other out. 121 This occurs in tzdata only in Asia/Tbilisi on 1997-03-30. 122 (Thanks to Renchunhui for a test case showing the bug.) 123 124 zic no longer assumes you can fflush a read-only stream. 125 (Problem reported by Christos Zoulas.) 126 127 zic no longer generates UT offsets equal to -2**31 and localtime.c 128 no longer accepts them, as they can cause trouble in both 129 localtime.c and its callers. RFC 9636 prohibits such offsets. 130 131 zic -p now warns that the -p option is obsolete and likely 132 ineffective. 133 134 135 Release 2025c - 2025-12-10 14:42:37 -0800 136 137 Briefly: 138 Several code changes for compatibility with FreeBSD. 139 140 Changes to past timestamps 141 142 Baja California agreed with Californias DST rules in 1953 and in 143 1961 through 1975, instead of observing standard time all year. 144 (Thanks to Alois Treindl.) 145 146 Changes to build procedure 147 148 Files in distributed tarballs now have correct commit times. 149 Formerly, the committers time zone was incorrectly ignored. 150 151 Distribution products (*.asc, *.gz, and *.lz) now have 152 reproducible timestamps. Formerly, only the contents of the 153 compressed tarballs had reproducible timestamps. 154 155 By default, distributed formatted man pages (*.txt) now use UTF-8 156 and are left-adjusted more consistently. A new Makefile macro 157 MANFLAGS can override these defaults. (Thanks to G. Branden 158 Robinson for inspiring these changes.) 159 160 Changes to code 161 162 An unset TZ is no longer invalid when /etc/localtime is missing, 163 and is abbreviated "UTC" not "-00". This reverts to 2024b behavior. 164 (Problem and patch reported by Dag-Erling Smrgrav.) 165 166 New function offtime_r, short for fixed-offset localtime_rz. 167 It is defined if STD_INSPIRED is defined. 168 (Patch from Dag-Erling Smrgrav.) 169 170 tzset etc. are now more cautious about questionable TZ settings. 171 Privileged programs now reject TZ settings that start with '/', 172 unless they are TZDEFAULT (default "/etc/localtime") or 173 start with TZDIR then '/' (default "/usr/share/zoneinfo/"). 174 Unprivileged programs now require files to be regular files 175 and reject relative names containing ".." directory components; 176 formerly, only privileged programs did those two things. 177 These changes were inspired by similar behavior in FreeBSD. 178 On NetBSD, unprivileged programs now use O_REGULAR to check 179 whether a TZ setting starting with '/' names a regular file, 180 avoiding a minor security race still present elsewhere. 181 TZ strings taken from tzalloc arguments are now treated with 182 no less caution than TZ strings taken from the environment, as 183 the old undocumented behavior would have been hard to explain. 184 tzset etc. no longer use the access system call to check access; 185 instead they now use the system calls issetugid, getauxval, 186 getresuid/getresgid, and geteuid/getegid/getuid/getgid (whichever 187 first works) to test whether a program is privileged. 188 Compile with -DHAVE_SYS_AUXV_H=[01] to enable or disable 189 <sys/auxv.h> which (if it defines AT_SECURE) enables getauxval, 190 and compile with -DHAVE_ISSETUGID=[01], -DHAVE_GETRESUID=[01], and 191 -DHAVE_GETEUID=[01] to enable or disable the other calls use. 192 193 The new CFLAGS option -DTZ_CHANGE_INTERVAL=N makes tzset etc. 194 check for TZif file changes if the in-memory data are N seconds 195 old or more, and are derived from the TZ environment variable. 196 This is intended for platforms that want tzset etc. to reflect 197 changes to whatever file TZ selects (including changes to 198 /etc/localtime if TZ is unset). If N is negative (the default) 199 these checks are omitted; this is the traditional behavior. 200 201 The new CFLAGS options -DHAVE_STRUCT_STAT_ST_CTIM=0 and 202 -DHAVE_STRUCT_TIMESPEC=0 port to non-POSIX.1-2008 platforms 203 that lack st_ctim and struct timespec, respectively. 204 On these platforms, the code falls back on st_ctime to 205 implement -DTZ_CHANGE_INTERVAL=N. 206 207 tzset etc. now treat ' ' like '_' in time zone abbreviations, 208 just as they treat other invalid bytes. This continues the 209 transition begun in release 96k, which removed spaces in tzdata 210 because the spaces break time string parsers. 211 212 The new CFLAGS option -DTHREAD_PREFER_SINGLE causes tzcode 213 in single-threaded processes to avoid locks, as FreeBSD does. 214 This can save time in single-threaded apps. The threadedness 215 testing costs CPU time and energy in multi-threaded apps. 216 New options -DHAVE___ISTHREADED and -DHAVE_SYS_SINGLE_THREADED_H 217 can help configure how to test for single-threadedness. 218 219 The new CFLAGS option -DTHREAD_RWLOCK uses read-write locks, as 220 macOS does, instead of mutexes. This saves real time when TZ is 221 rarely changing and many threads call tzcode simultaneously. 222 It costs more CPU time and energy. 223 224 The new CFLAGS option -TTHREAD_TM_MULTI causes localtime to return 225 a pointer to thread-specific memory, as FreeBSD does, instead of 226 to the same memory in all threads. This supports nonportable 227 programs that incorrectly use localtime instead of localtime_r. 228 This option affects gmtime and offtime similarly to localtime. 229 Because the corresponding storage is freed on thread exit, this 230 option is incompatible with POSIX.1-2024 and earlier. It also 231 costs CPU time and memory. 232 233 tzfree now preserves errno, consistently with POSIX.1-2024 free. 234 235 tzcode now uses mempcpy if available, guessing its availability. 236 Compile with -DHAVE_MEMPCPY=1 or 0 to override the guess. 237 238 tzcode now uses strnlen to improve asymptotic performance a bit. 239 Compile with -DHAVE_STRNLEN=0 if your platform lacks it. 240 241 tzcode now hand-declares unistd.h-provided symbols like getopt 242 if HAVE_UNISTD_H=0, not if HAVE_POSIX_DECLS=0. 243 244 tzset etc. now have an experimental OPENAT_TZDIR option; 245 see Makefile and localtime.c for details. 246 247 On platforms like GNU/Hurd that do not define PATH_MAX, 248 exceedingly long TZ strings no longer fail merely because they 249 exceed an arbitrary file name length limit imposed by tzcode. 250 251 zic has new options inspired by FreeBSD. -D skips creation of 252 output ancestor directories, -m MODE sets output files mode, 253 and -u OWNER[:GROUP] sets output files owner and group. 254 255 zic now uses the fdopen function, which was standardized by 256 POSIX.1-1988 and is now safe to use in portable code. 257 This replaces its use of the older umask function, which 258 complicated maintenance. 259 260 Changes to commentary 261 262 The leapseconds file contains commentary about the IERS and NIST 263 last-modified and expiration timestamps for leap second data. 264 (Thanks to Judah Levine.) 265 266 Commentary now also uses characters from the set as this 267 can be useful and should work with current applications. This 268 also affects data in iso3166.tab and zone1970.tab, which now 269 contain strings like Cte dIvoire instead of Cte d'Ivoire. 270 271 272 Release 2025b - 2025-03-22 13:40:46 -0700 273 274 Briefly: 275 New zone for Aysn Region in Chile which moves from -04/-03 to -03. 276 277 Changes to future timestamps 278 279 Chile's Aysn Region moves from -04/-03 to -03 year-round, joining 280 Magallanes Region. The region will not change its clocks on 281 2025-04-05 at 24:00, diverging from America/Santiago and creating a 282 new zone America/Coyhaique. (Thanks to Yonathan Dossow.) Model 283 this as a change to standard offset effective 2025-03-20. 284 285 Changes to past timestamps 286 287 Iran switched from +04 to +0330 on 1978-11-10 at 24:00, not at 288 year end. (Thanks to Roozbeh Pournader.) 289 290 Changes to code 291 292 'zic -l TIMEZONE -d . -l /some/other/file/system' no longer 293 attempts to create an incorrect symlink, and no longer has a 294 read buffer underflow. (Problem reported by Evgeniy Gorbanev.) 295 296 297 Release 2025a - 2025-01-15 10:47:24 -0800 298 299 Briefly: 300 Paraguay adopted permanent -03 starting spring 2024. 301 Improve pre-1991 data for the Philippines. 302 Etc/Unknown is now reserved. 303 304 Changes to future timestamps 305 306 Paraguay stopped changing its clocks after the spring-forward 307 transition on 2024-10-06, so it is now permanently at -03. 308 (Thanks to Heitor David Pinto and Even Scharning.) 309 This affects timestamps starting 2025-03-22, as well as the 310 obsolescent tm_isdst flags starting 2024-10-15. 311 312 Changes to past timestamps 313 314 Correct timestamps for the Philippines before 1900, and from 1937 315 through 1990. (Thanks to P Chan for the heads-up and citations.) 316 This includes adjusting local mean time before 1899; fixing 317 transitions in September 1899, January 1937, and June 1954; adding 318 transitions in December 1941, November 1945, March and September 319 1977, and May and July 1990; and removing incorrect transitions in 320 March and September 1978. 321 322 Changes to data 323 324 Add zone1970.tab lines for the Concordia and Eyre Bird Observatory 325 research stations. (Thanks to Derick Rethans and Jule Dabars.) 326 327 Changes to code 328 329 strftime %s now generates the correct numeric string even when the 330 represented number does not fit into time_t. This is better than 331 generating the numeric equivalent of (time_t) -1, as strftime did 332 in TZDB releases 96a (when %s was introduced) through 2020a and in 333 releases 2022b through 2024b. It is also better than failing and 334 returning 0, as strftime did in releases 2020b through 2022a. 335 336 strftime now outputs an invalid conversion specifier as-is, 337 instead of eliding the leading '%', which confused debugging. 338 339 An invalid TZ now generates the time zone abbreviation "-00", not 340 "UTC", to help the user see that an error has occurred. (Thanks 341 to Arthur David Olson for suggesting a "wrong result".) 342 343 mktime and timeoff no longer incorrectly fail merely because a 344 struct tm component near INT_MIN or INT_MAX overflows when a 345 lower-order component carries into it. 346 347 TZNAME_MAXIMUM, the maximum number of bytes in a proleptic TZ 348 string's time zone abbreviation, now defaults to 254 not 255. 349 This helps reduce the size of internal state from 25480 to 21384 350 on common platforms. This change should not be a problem, as 351 nobody uses such long "abbreviations" and the longstanding tzcode 352 maximum was 16 until release 2023a. For those who prefer no 353 arbitrary limits, you can now specify TZNAME_MAXIMUM values up to 354 PTRDIFF_MAX, a limit forced by C anyway; formerly tzcode silently 355 misbehaved unless TZNAME_MAXIMUM was less than INT_MAX. 356 357 tzset and related functions no longer leak a file descriptor if 358 another thread forks or execs at about the same time and if the 359 platform has O_CLOFORK and O_CLOEXEC respectively. Also, the 360 functions no longer let a TZif file become a controlling terminal. 361 362 'zdump -' now reads TZif data from /dev/stdin. 363 (From a question by Arthur David Olson.) 364 365 Changes to documentation 366 367 The name Etc/Unknown is now reserved: it will not be used by TZDB. 368 This is for compatibility with CLDR, which uses the string 369 "Etc/Unknown" for an unknown or invalid timezone. (Thanks to 370 Justin Grant, Mark Davis, and Guy Harris.) 371 372 Cite Internet RFC 9636, which obsoletes RFC 8536 for TZif format. 373 374 375 Release 2024b - 2024-09-04 12:27:47 -0700 376 377 Briefly: 378 Improve historical data for Mexico, Mongolia, and Portugal. 379 System V names are now obsolescent. 380 The main data form now uses %z. 381 The code now conforms to RFC 8536 for early timestamps. 382 Support POSIX.1-2024, which removes asctime_r and ctime_r. 383 Assume POSIX.2-1992 or later for shell scripts. 384 SUPPORT_C89 now defaults to 1. 385 386 Changes to past timestamps 387 388 Asia/Choibalsan is now an alias for Asia/Ulaanbaatar rather than 389 being a separate Zone with differing behavior before April 2008. 390 This seems better given our wildly conflicting information about 391 Mongolia's time zone history. (Thanks to Heitor David Pinto.) 392 393 Historical transitions for Mexico have been updated based on 394 official Mexican decrees. The affected timestamps occur during 395 the years 1921-1927, 1931, 1945, 1949-1970, and 1981-1997. 396 The affected zones are America/Bahia_Banderas, America/Cancun, 397 America/Chihuahua, America/Ciudad_Juarez, America/Hermosillo, 398 America/Mazatlan, America/Merida, America/Mexico_City, 399 America/Monterrey, America/Ojinaga, and America/Tijuana. 400 (Thanks to Heitor David Pinto.) 401 402 Historical transitions for Portugal, represented by Europe/Lisbon, 403 Atlantic/Azores, and Atlantic/Madeira, have been updated based on a 404 close reading of old Portuguese legislation, replacing previous data 405 mainly originating from Whitman and Shanks & Pottenger. These 406 changes affect a few transitions in 1917-1921, 1924, and 1940 407 throughout these regions by a few hours or days, and various 408 timestamps between 1977 and 1993 depending on the region. In 409 particular, the Azores and Madeira did not observe DST from 1977 to 410 1981. Additionally, the adoption of standard zonal time in former 411 Portuguese colonies have been adjusted: Africa/Maputo in 1909, and 412 Asia/Dili by 22 minutes at the start of 1912. 413 (Thanks to Tim Parenti.) 414 415 Changes to past tm_isdst flags 416 417 The period from 1966-04-03 through 1966-10-02 in Portugal is now 418 modeled as DST, to more closely reflect how contemporaneous changes 419 in law entered into force. 420 421 Changes to data 422 423 Names present only for compatibility with UNIX System V 424 (last released in the 1990s) have been moved to 'backward'. 425 These names, which for post-1970 timestamps mostly just duplicate 426 data of geographical names, were confusing downstream uses. 427 Names moved to 'backward' are now links to geographical names. 428 This affects behavior for TZ='EET' for some pre-1981 timestamps, 429 for TZ='CET' for some pre-1947 timestamps, and for TZ='WET' for 430 some pre-1996 timestamps. Also, TZ='MET' now behaves like 431 TZ='CET' and so uses the abbreviation "CET" rather than "MET". 432 Those needing the previous TZDB behavior, which does not match any 433 real-world clocks, can find the old entries in 'backzone'. 434 (Problem reported by Justin Grant.) 435 436 The main source files' time zone abbreviations now use %z, 437 supported by zic since release 2015f and used in vanguard form 438 since release 2022b. For example, America/Sao_Paulo now contains 439 the zone continuation line "-3:00 Brazil %z", which is less error 440 prone than the old "-3:00 Brazil -03/-02". This does not change 441 the represented data: the generated TZif files are unchanged. 442 Rearguard form still avoids %z, to support obsolescent parsers. 443 444 Asia/Almaty has been removed from zonenow.tab as it now agrees 445 with Asia/Tashkent for future timestamps, due to Kazakhstan's 446 2024-02-29 time zone change. Similarly, America/Scoresbysund 447 has been removed, as it now agrees with America/Nuuk due to 448 its 2024-03-31 time zone change. 449 450 Changes to code 451 452 localtime.c now always uses a TZif file's time type 0 to handle 453 timestamps before the file's first transition. Formerly, 454 localtime.c sometimes inferred a different time type, in order to 455 handle problematic data generated by zic 2018e or earlier. As it 456 is now safe to assume more recent versions of zic, there is no 457 longer a pressing need to fail to conform RFC 8536 section 3.2, 458 which requires using time type 0 in this situation. This change 459 does not affect behavior when reading TZif files generated by zic 460 2018f and later. 461 462 POSIX.1-2024 removes asctime_r and ctime_r and does not let 463 libraries define them, so remove them except when needed to 464 conform to earlier POSIX. These functions are dangerous as they 465 can overrun user buffers. If you still need them, add 466 -DSUPPORT_POSIX2008 to CFLAGS. 467 468 The SUPPORT_C89 option now defaults to 1 instead of 0, fixing a 469 POSIX-conformance bug introduced in 2023a. 470 471 tzselect now supports POSIX.1-2024 proleptic TZ strings. Also, it 472 assumes POSIX.2-1992 or later, as practical porting targets now 473 all support that, and it uses some features from POSIX.1-2024 if 474 available. 475 476 Changes to build procedure 477 478 'make check' no longer requires curl and Internet access. 479 480 The build procedure now assumes POSIX.2-1992 or later, to simplify 481 maintenance. To build on Solaris 10, the only extant system still 482 defaulting to pre-POSIX, prepend /usr/xpg4/bin to PATH. 483 484 Changes to documentation 485 486 The documentation now reflects POSIX.1-2024. 487 488 Changes to commentary 489 490 Commentary about historical transitions in Portugal and her former 491 colonies has been expanded with links to relevant legislation. 492 (Thanks to Tim Parenti.) 493 494 495 Release 2024a - 2024-02-01 09:28:56 -0800 496 497 Briefly: 498 Kazakhstan unifies on UTC+5 beginning 2024-03-01. 499 Palestine springs forward a week later after Ramadan. 500 zic no longer pretends to support indefinite-past DST. 501 localtime no longer mishandles Ciudad Jurez in 2422. 502 503 Changes to future timestamps 504 505 Kazakhstan unifies on UTC+5. This affects Asia/Almaty and 506 Asia/Qostanay which together represent the eastern portion of the 507 country that will transition from UTC+6 on 2024-03-01 at 00:00 to 508 join the western portion. (Thanks to Zhanbolat Raimbekov.) 509 510 Palestine springs forward a week later than previously predicted 511 in 2024 and 2025. (Thanks to Heba Hamad.) Change spring-forward 512 predictions to the second Saturday after Ramadan, not the first; 513 this also affects other predictions starting in 2039. 514 515 Changes to past timestamps 516 517 Asia/Ho_Chi_Minh's 1955-07-01 transition occurred at 01:00 518 not 00:00. (Thanks to on Trn Cng Danh.) 519 520 From 1947 through 1949, Toronto's transitions occurred at 02:00 521 not 00:00. (Thanks to Chris Walton.) 522 523 In 1911 Miquelon adopted standard time on June 15, not May 15. 524 525 Changes to code 526 527 The FROM and TO columns of Rule lines can no longer be "minimum" 528 or an abbreviation of "minimum", because TZif files do not support 529 DST rules that extend into the indefinite past - although these 530 rules were supported when TZif files had only 32-bit data, this 531 stopped working when 64-bit TZif files were introduced in 1995. 532 This should not be a problem for realistic data, since DST was 533 first used in the 20th century. As a transition aid, FROM columns 534 like "minimum" are now diagnosed and then treated as if they were 535 the year 1900; this should suffice for TZif files on old systems 536 with only 32-bit time_t, and it is more compatible with bugs in 537 2023c-and-earlier localtime.c. (Problem reported by Yoshito 538 Umaoka.) 539 540 localtime and related functions no longer mishandle some 541 timestamps that occur about 400 years after a switch to a time 542 zone with a DST schedule. In 2023d data this problem was visible 543 for some timestamps in November 2422, November 2822, etc. in 544 America/Ciudad_Juarez. (Problem reported by Gilmore Davidson.) 545 546 strftime %s now uses tm_gmtoff if available. (Problem and draft 547 patch reported by Dag-Erling Smrgrav.) 548 549 Changes to build procedure 550 551 The leap-seconds.list file is now copied from the IERS instead of 552 from its downstream counterpart at NIST, as the IERS version is 553 now in the public domain too and tends to be more up-to-date. 554 (Thanks to Martin Burnicki for liaisoning with the IERS.) 555 556 Changes to documentation 557 558 The strftime man page documents which struct tm members affect 559 which conversion specs, and that tzset is called. (Problems 560 reported by Robert Elz and Steve Summit.) 561 562 563 Release 2023d - 2023-12-21 20:02:24 -0800 564 565 Briefly: 566 Ittoqqortoormiit, Greenland changes time zones on 2024-03-31. 567 Vostok, Antarctica changed time zones on 2023-12-18. 568 Casey, Antarctica changed time zones five times since 2020. 569 Code and data fixes for Palestine timestamps starting in 2072. 570 A new data file zonenow.tab for timestamps starting now. 571 572 Changes to future timestamps 573 574 Ittoqqortoormiit, Greenland (America/Scoresbysund) joins most of 575 the rest of Greenland's timekeeping practice on 2024-03-31, by 576 changing its time zone from -01/+00 to -02/-01 at the same moment 577 as the spring-forward transition. Its clocks will therefore not 578 spring forward as previously scheduled. The time zone change 579 reverts to its common practice before 1981. (Thanks to Jule Dabars.) 580 581 Fix predictions for DST transitions in Palestine in 2072-2075, 582 correcting a typo introduced in 2023a. (Thanks to Jule Dabars.) 583 584 Changes to past and future timestamps 585 586 Vostok, Antarctica changed to +05 on 2023-12-18. It had been at 587 +07 (not +06) for years. (Thanks to Zakhary V. Akulov.) 588 589 Change data for Casey, Antarctica to agree with timeanddate.com, 590 by adding five time zone changes since 2020. Casey is now at +08 591 instead of +11. 592 593 Changes to past tm_isdst flags 594 595 Much of Greenland, represented by America/Nuuk, changed its 596 standard time from -03 to -02 on 2023-03-25, not on 2023-10-28. 597 This does not affect UTC offsets, only the tm_isdst flag. 598 (Thanks to Thomas M. Steenholdt.) 599 600 New data file 601 602 A new data file zonenow.tab helps configure applications that use 603 timestamps dated from now on. This simplifies configuration, 604 since users choose from a smaller Zone set. The file's format is 605 experimental and subject to change. 606 607 Changes to code 608 609 localtime.c no longer mishandles TZif files that contain a single 610 transition into a DST regime. Previously, it incorrectly assumed 611 DST was in effect before the transition too. (Thanks to Alois 612 Treindl for debugging help.) 613 614 localtime.c's timeoff no longer collides with OpenBSD 7.4. 615 616 The C code now uses _Generic only if __STDC_VERSION__ says the 617 compiler is C11 or later. 618 619 tzselect now optionally reads zonenow.tab, to simplify when 620 configuring only for timestamps dated from now on. 621 622 tzselect no longer creates temporary files. 623 624 tzselect no longer mishandles the following: 625 626 Spaces and most other special characters in BUGEMAIL, PACKAGE, 627 TZDIR, and VERSION. 628 629 TZ strings when using mawk 1.4.3, which mishandles regular 630 expressions of the form /X{2,}/. 631 632 ISO 6709 coordinates when using an awk that lacks the GNU 633 extension of newlines in -v option-arguments. 634 635 Non UTF-8 locales when using an iconv command that lacks the GNU 636 //TRANSLIT extension. 637 638 zic no longer mishandles data for Palestine after the year 2075. 639 Previously, it incorrectly omitted post-2075 transitions that are 640 predicted for just before and just after Ramadan. (Thanks to Ken 641 Murchison for debugging help.) 642 643 zic now works again on Linux 2.6.16 and 2.6.17 (2006). 644 (Problem reported by Rune Torgersen.) 645 646 Changes to build procedure 647 648 The Makefile is now more compatible with POSIX: 649 * It no longer defines AR, CC, CFLAGS, LDFLAGS, and SHELL. 650 * It no longer uses its own 'cc' in place of CC. 651 * It now uses ARFLAGS, with default specified by POSIX. 652 * It does not use LFLAGS incompatibly with POSIX. 653 * It uses the special .POSIX target. 654 * It quotes special characters more carefully. 655 * It no longer mishandles builds in an ISO 8859 locale. 656 Due to the CC changes, TZDIR is now #defined in a file tzdir.h 657 built by 'make', not in a $(CC) -D option. Also, TZDEFAULT is 658 now treated like TZDIR as they have similar roles. 659 660 Changes to commentary 661 662 Limitations and hazards of the optional support for obsolescent 663 C89 platforms are documented better, along with a tentative 664 schedule for removing this support. 665 666 667 Release 2023c - 2023-03-28 12:42:14 -0700 668 669 Changes to past and future timestamps 670 671 Model Lebanon's DST chaos by reverting data to tzdb 2023a. 672 (Thanks to Rany Hany for the heads-up.) 673 674 675 Release 2023b - 2023-03-23 19:50:38 -0700 676 677 Changes to future timestamps 678 679 This year Lebanon springs forward April 20/21 not March 25/26. 680 (Thanks to Saadallah Itani.) [This was reverted in 2023c.] 681 682 683 Release 2023a - 2023-03-22 12:39:33 -0700 684 685 Briefly: 686 Egypt now uses DST again, from April through October. 687 This year Morocco springs forward April 23, not April 30. 688 Palestine delays the start of DST this year. 689 Much of Greenland still uses DST from 2024 on. 690 America/Yellowknife now links to America/Edmonton. 691 tzselect can now use current time to help infer timezone. 692 The code now defaults to C99 or later. 693 Fix use of C23 attributes. 694 695 Changes to future timestamps 696 697 Starting in 2023, Egypt will observe DST from April's last Friday 698 through October's last Thursday. (Thanks to Ahmad ElDardiry.) 699 Assume the transition times are 00:00 and 24:00, respectively. 700 701 In 2023 Morocco's spring-forward transition after Ramadan 702 will occur April 23, not April 30. (Thanks to Milamber.) 703 Adjust predictions for future years accordingly. This affects 704 predictions for 2023, 2031, 2038, and later years. 705 706 This year Palestine will delay its spring forward from 707 March 25 to April 29 due to Ramadan. (Thanks to Heba Hamad.) 708 Make guesses for future Ramadans too. 709 710 Much of Greenland, represented by America/Nuuk, will continue to 711 observe DST using European Union rules. When combined with 712 Greenland's decision not to change the clocks in fall 2023, 713 America/Nuuk therefore changes from -03/-02 to -02/-01 effective 714 2023-10-29 at 01:00 UTC. (Thanks to Thomas M. Steenholdt.) 715 This change from 2022g doesn't affect timestamps until 2024-03-30, 716 and doesn't affect tm_isdst until 2023-03-25. 717 718 Changes to past timestamps 719 720 America/Yellowknife has changed from a Zone to a backward 721 compatibility Link, as it no longer differs from America/Edmonton 722 since 1970. (Thanks to Almaz Mingaleev.) This affects some 723 pre-1948 timestamps. The old data are now in 'backzone'. 724 725 Changes to past time zone abbreviations 726 727 When observing Moscow time, Europe/Kirov and Europe/Volgograd now 728 use the abbreviations MSK/MSD instead of numeric abbreviations, 729 for consistency with other timezones observing Moscow time. 730 731 Changes to code 732 733 You can now tell tzselect local time, to simplify later choices. 734 Select the 'time' option in its first prompt. 735 736 You can now compile with -DTZNAME_MAXIMUM=N to limit time zone 737 abbreviations to N bytes (default 255). The reference runtime 738 library now rejects POSIX-style TZ strings that contain longer 739 abbreviations, treating them as UTC. Previously the limit was 740 platform dependent and abbreviations were silently truncated to 741 16 bytes even when the limit was greater than 16. 742 743 The code by default is now designed for C99 or later. To build on 744 a mostly-C89 platform, compile with -DPORT_TO_C89; this should 745 work on C89 platforms that also support C99 'long long' and 746 perhaps a few other extensions to C89. To support C89 callers of 747 tzcode's library, compile with -DSUPPORT_C89; however, this could 748 trigger latent bugs in C99-or-later callers. The two new macros 749 are transitional aids planned to be removed in a future version 750 (say, in 2029), when C99 or later will be required. 751 752 The code now builds again on pre-C99 platforms, if you compile 753 with -DPORT_TO_C89. This fixes a bug introduced in 2022f. 754 755 On C23-compatible platforms tzcode no longer uses syntax like 756 'static [[noreturn]] void usage(void);'. Instead, it uses 757 '[[noreturn]] static void usage(void);' as strict C23 requires. 758 (Problem reported by Houge Langley.) 759 760 The code's functions now constrain their arguments with the C 761 'restrict' keyword consistently with their documentation. 762 This may allow future optimizations. 763 764 zdump again builds standalone with ckdadd and without setenv, 765 fixing a bug introduced in 2022g. (Problem reported by panic.) 766 767 leapseconds.awk can now process a leap seconds file that never 768 expires; this might be useful if leap seconds are discontinued. 769 770 Changes to commentary 771 772 tz-link.html has a new section "Coordinating with governments and 773 distributors". (Thanks to Neil Fuller for some of the text.) 774 775 To improve tzselect diagnostics, zone1970.tab's comments column is 776 now limited to countries that have multiple timezones. 777 778 Note that there are plans to discontinue leap seconds by 2035. 779 780 781 Release 2022g - 2022-11-29 08:58:31 -0800 782 783 Briefly: 784 The northern edge of Chihuahua changes to US timekeeping. 785 Much of Greenland stops changing clocks after March 2023. 786 Fix some pre-1996 timestamps in northern Canada. 787 C89 is now deprecated; please use C99 or later. 788 Portability fixes for AIX, libintl, MS-Windows, musl, z/OS 789 In C code, use more C23 features if available. 790 C23 timegm now supported by default 791 Fixes for unlikely integer overflows 792 793 Changes to future timestamps 794 795 In the Mexican state of Chihuahua, the border strip near the US 796 will change to agree with nearby US locations on 2022-11-30. 797 The strip's western part, represented by Ciudad Jurez, switches 798 from -06 all year to -07/-06 with US DST rules, like El Paso, TX. 799 The eastern part, represented by Ojinaga, will observe US DST next 800 year, like Presidio, TX. (Thanks to Heitor David Pinto.) 801 A new Zone America/Ciudad_Juarez splits from America/Ojinaga. 802 803 Much of Greenland, represented by America/Nuuk, stops observing 804 winter time after March 2023, so its daylight saving time becomes 805 standard time. (Thanks to Jonas Nyrup and Jrgen Appel.) 806 807 Changes to past timestamps 808 809 Changes for pre-1996 northern Canada (thanks to Chris Walton): 810 811 Merge America/Iqaluit and America/Pangnirtung into the former, 812 with a backward compatibility link for the latter name. 813 There is no good evidence the two locations differ since 1970. 814 This change affects pre-1996 America/Pangnirtung timestamps. 815 816 Cambridge Bay, Inuvik, Iqaluit, Rankin Inlet, Resolute and 817 Yellowknife did not observe DST in 1965, and did observe DST 818 from 1972 through 1979. 819 820 Whitehorse moved from -09 to -08 on 1966-02-27, not 1967-05-28. 821 822 Colombia's 1993 fallback was 02-06 24:00, not 04-04 00:00. 823 (Thanks to Alois Treindl.) 824 825 Singapore's 1981-12-31 change was at 16:00 UTC (23:30 local time), 826 not 24:00 local time. (Thanks to Geoff Clare via Robert Elz.) 827 828 Changes to code 829 830 Although tzcode still works with C89, bugs found in recent routine 831 maintenance indicate that bitrot has set in and that in practice 832 C89 is no longer used to build tzcode. As it is a maintenance 833 burden, support for C89 is planned to be removed soon. Instead, 834 please use compilers compatible with C99, C11, C17, or C23. 835 836 timegm, which tzcode implemented in 1989, will finally be 837 standardized 34 years later as part of C23, so timegm is now 838 supported even if STD_INSPIRED is not defined. 839 840 Fix bug in zdump's tzalloc emulation on hosts that lack tm_zone. 841 (Problem reported by on Trn Cng Danh.) 842 843 Fix bug in zic on hosts where malloc(0) yields NULL on success. 844 (Problem reported by Tim McBrayer for AIX 6.1.) 845 846 Fix zic configuration to avoid linkage failures on some platforms. 847 (Problems reported by Gilmore Davidson and Igor Ivanov.) 848 849 Work around MS-Windows nmake incompatibility with POSIX. 850 (Problem reported by Manuela Friedrich.) 851 852 Port mktime and strftime to debugging platforms where accessing 853 uninitialized data has undefined behavior (strftime problem 854 reported by Robert Elz). 855 856 Check more carefully for unlikely integer overflows, preferring 857 C23 <stdckdint.h> to overflow checking by hand, as the latter has 858 had obscure bugs. 859 860 Changes to build procedure 861 862 New Makefile rule check_mild that skips checking whether Link 863 lines are in the file 'backward'. (Inspired by a suggestion from 864 Stephen Colebourne.) 865 866 867 Release 2022f - 2022-10-28 18:04:57 -0700 868 869 Briefly: 870 Mexico will no longer observe DST except near the US border. 871 Chihuahua moves to year-round -06 on 2022-10-30. 872 Fiji no longer observes DST. 873 Move links to 'backward'. 874 In vanguard form, GMT is now a Zone and Etc/GMT a link. 875 zic now supports links to links, and vanguard form uses this. 876 Simplify four Ontario zones. 877 Fix a Y2438 bug when reading TZif data. 878 Enable 64-bit time_t on 32-bit glibc platforms. 879 Omit large-file support when no longer needed. 880 In C code, use some C23 features if available. 881 Remove no-longer-needed workaround for Qt bug 53071. 882 883 Changes to future timestamps 884 885 Mexico will no longer observe DST after 2022, except for areas 886 near the US border that continue to observe US DST rules. 887 On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves 888 from -07 (-06 with DST) to year-round -06, thus not changing 889 its clocks that day. The new law states that Chihuahua 890 near the US border no longer observes US DST. 891 (Thanks to gera for the heads-up about Chihuahua.) 892 893 Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.) 894 For now, assume DST is suspended indefinitely. 895 896 Changes to data 897 898 Move links to 'backward' to ease and simplify link maintenance. 899 This affects generated data only if you use 'make BACKWARD='. 900 901 GMT is now a Zone and Etc/GMT a link instead of vice versa, 902 as GMT is needed for leap second support whereas Etc/GMT is not. 903 However, this change exposes a bug in TZUpdater 2.3.2 so it is 904 present only in vanguard form for now. 905 906 Vanguard form now uses links to links, as zic now supports this. 907 908 Changes to past timestamps 909 910 Simplify four Ontario zones, as most of the post-1970 differences 911 seem to have been imaginary. (Problem reported by Chris Walton.) 912 Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay 913 to 'backzone'; backward-compatibility links still work, albeit 914 with some different timestamps before November 2005. 915 916 Changes to code 917 918 zic now supports links to links regardless of input line order. 919 For example, if Australia/Sydney is a Zone, the lines 920 Link Australia/Canberra Australia/ACT 921 Link Australia/Sydney Australia/Canberra 922 now work correctly, even though the shell commands 923 ln Australia/Canberra Australia/ACT 924 ln Australia/Sydney Australia/Canberra 925 would fail because the first command attempts to use a link 926 Australia/Canberra that does not exist until after the second 927 command is executed. Previously, zic had unspecified behavior if 928 a Link line's target was another link, and zic often misbehaved if 929 a Link line's target was a later Link line. 930 931 Fix line number in zic's diagnostic for a link to a link. 932 933 Fix a bug that caused localtime to mishandle timestamps starting 934 in the year 2438 when reading data generated by 'zic -b fat' when 935 distant-future DST transitions occur at times given in standard 936 time or in UT, not the usual case of local time. This occurs when 937 the corresponding .zi Rule lines specify DST transitions with TO 938 columns of 'max' and AT columns that end in 's' or 'u'. The 939 number 2438 comes from the 32-bit limit in the year 2038, plus the 940 400-year Gregorian cycle. (Problem reported by Bradley White.) 941 942 On glibc 2.34 and later, which optionally supports 64-bit time_t 943 on platforms like x86 where time_t was traditionally 32 bits, 944 default time_t to 64 instead of 32 bits. This lets functions like 945 localtime support timestamps after the year 2038, and fixes 946 year-2038 problems in zic when accessing files dated after 2038. 947 To continue to limit time_t to 32 bits on these platforms, use 948 "make CFLAGS='-D_TIME_BITS=32'". 949 950 In C code, do not enable large-file support on platforms like AIX 951 and macOS that no longer need it now that tzcode does not use 952 off_t or related functions like 'stat'. Large-file support is 953 still enabled by default on GNU/Linux, as it is needed for 64-bit 954 time_t support. 955 956 In C code, prefer C23 keywords to pre-C23 macros for alignof, 957 bool, false, and true. Also, use the following C23 features if 958 available: __has_include, unreachable. 959 960 zic no longer works around Qt bug 53071, as the relevant Qt 961 releases have been out of support since 2019. This change affects 962 only fat TZif files, as thin files never had the workaround. 963 964 zdump no longer modifies the environ vector when compiled on 965 platforms lacking tm_zone or when compiled with -DUSE_LTZ=0. 966 This avoid undefined behavior on POSIX platforms. 967 968 969 Release 2022e - 2022-10-11 11:13:02 -0700 970 971 Briefly: 972 Jordan and Syria switch from +02/+03 with DST to year-round +03. 973 974 Changes to future timestamps 975 976 Jordan and Syria are abandoning the DST regime and are changing to 977 permanent +03, so they will not fall back from +03 to +02 on 978 2022-10-28. (Thanks to Steffen Thorsen and Issam Al-Zuwairi.) 979 980 Changes to past timestamps 981 982 On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00. 983 984 Changes to past time zone abbreviations and DST flags 985 986 The temporary advancement of clocks in central Mexico in summer 987 1931 is now treated as daylight saving time, instead of as two 988 changes to standard time. 989 990 991 Release 2022d - 2022-09-23 12:02:57 -0700 992 993 Briefly: 994 Palestine transitions are now Saturdays at 02:00. 995 Simplify three Ukraine zones into one. 996 997 Changes to future timestamps 998 999 Palestine now springs forward and falls back at 02:00 on the 1000 first Saturday on or after March 24 and October 24, respectively. 1001 This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00. 1002 (Thanks to Heba Hamad.) 1003 1004 Changes to past timestamps 1005 1006 Simplify three Ukraine zones to one, since the post-1970 1007 differences seem to have been imaginary. Move Europe/Uzhgorod and 1008 Europe/Zaporozhye to 'backzone'; backward-compatibility links 1009 still work, albeit with different timestamps before October 1991. 1010 1011 1012 Release 2022c - 2022-08-15 17:47:18 -0700 1013 1014 Briefly: 1015 Work around awk bug in FreeBSD, macOS, etc. 1016 Improve tzselect on intercontinental Zones. 1017 1018 Changes to code 1019 1020 Work around a bug in onetrueawk that broke commands like 1021 'make traditional_tarballs' on FreeBSD, macOS, etc. 1022 (Problem reported by Deborah Goldsmith.) 1023 1024 Add code to tzselect that uses experimental structured comments in 1025 zone1970.tab to clarify whether Zones like Africa/Abidjan and 1026 Europe/Istanbul cross continent or ocean boundaries. 1027 (Inspired by a problem reported by Peter Krefting.) 1028 1029 Fix bug with 'zic -d /a/b/c' when /a is unwritable but the 1030 directory /a/b already exists. 1031 1032 Remove zoneinfo2tdf.pl, as it was unused and triggered false 1033 malware alarms on some email servers. 1034 1035 1036 Release 2022b - 2022-08-10 15:38:32 -0700 1037 1038 Briefly: 1039 Chile's DST is delayed by a week in September 2022. 1040 Iran no longer observes DST after 2022. 1041 Rename Europe/Kiev to Europe/Kyiv. 1042 New zic -R option 1043 Vanguard form now uses %z. 1044 Finish moving duplicate-since-1970 zones to 'backzone'. 1045 New build option PACKRATLIST 1046 New tailored_tarballs target, replacing rearguard_tarballs 1047 1048 Changes to future timestamps 1049 1050 Chile's 2022 DST start is delayed from September 4 to September 11. 1051 (Thanks to Juan Correa.) 1052 1053 Iran plans to stop observing DST permanently, after it falls back 1054 on 2022-09-21. (Thanks to Ali Mirjamali.) 1055 1056 Changes to past timestamps 1057 1058 Finish moving to 'backzone' the location-based zones whose 1059 timestamps since 1970 are duplicates; adjust links accordingly. 1060 This change ordinarily affects only pre-1970 timestamps, and with 1061 the new PACKRATLIST option it does not affect any timestamps. 1062 In this round the affected zones are Antarctica/Vostok, 1063 Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, 1064 Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, 1065 Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, 1066 Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, 1067 Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, 1068 Pacific/Wake and Pacific/Wallis, and the affected links are 1069 Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, 1070 Pacific/Truk, and Pacific/Yap. 1071 1072 From fall 1994 through fall 1995, Shanks wrote that Crimea's 1073 DST transitions were at 02:00 standard time, not at 00:00. 1074 (Thanks to Michael Deckers.) 1075 1076 Iran adopted standard time in 1935, not 1946. In 1977 it observed 1077 DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 1078 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 1079 transition was on 05-27, not 03-21. 1080 (Thanks to Roozbeh Pournader and Francis Santoni.) 1081 1082 Chile's observance of -04 from 1946-08-29 through 1947-03-31 was 1083 considered DST, not standard time. Santiago and environs had moved 1084 their clocks back to rejoin the rest of mainland Chile; put this 1085 change at the end of 1946-08-28. (Thanks to Michael Deckers.) 1086 1087 Some old, small clock transitions have been removed, as people at 1088 the time did not change their clocks. This affects Asia/Hong_Kong 1089 in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. 1090 1091 Changes to zone name 1092 1093 Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in 1094 English now. Spelling of other names in Ukraine has not yet 1095 demonstrably changed in common English practice so for now these 1096 names retain old spellings, as in other countries (e.g., 1097 Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). 1098 1099 Changes to code 1100 1101 zic has a new option '-R @N' to output explicit transitions < N. 1102 (Need suggested by Almaz Mingaleev.) 1103 1104 'zic -r @N' no longer outputs bad data when N < first transition. 1105 (Problem introduced in 2021d and reported by Peter Krefting.) 1106 1107 zic now checks its input for NUL bytes and unterminated lines, and 1108 now supports input line lengths up to 2048 (not 512) bytes. 1109 1110 gmtime and related code now use the abbreviation "UTC" not "GMT". 1111 POSIX is being revised to require this. 1112 1113 When tzset and related functions set vestigial static variables 1114 like tzname, they now prefer specified timestamps to unspecified ones. 1115 (Problem reported by Almaz Mingaleev.) 1116 1117 zic no longer complains "can't determine time zone abbreviation to 1118 use just after until time" when a transition to a new standard 1119 time occurs simultaneously with the first DST fallback transition. 1120 1121 Changes to build procedure 1122 1123 Source data in vanguard form now uses the %z notation, introduced 1124 in release 2015f. For example, for America/Sao_Paulo vanguard 1125 form contains the zone continuation line "-3:00 Brazil %z", which 1126 is simpler and more reliable than the line "-3:00 Brazil -03/-02" 1127 used in main and rearguard forms. The plan is for the main form 1128 to use %z eventually; in the meantime maintainers of zi parsers 1129 are encouraged to test the parsers on vanguard.zi. 1130 1131 The Makefile has a new PACKRATLIST option to select a subset of 1132 'backzone'. For example, 'make PACKRATDATA=backzone 1133 PACKRATLIST=zone.tab' now generates TZif files identical to those 1134 of the global-tz project. 1135 1136 The Makefile has a new tailored_tarballs target for generating 1137 special-purpose tarballs. It generalizes and replaces the 1138 rearguard_tarballs target and related targets and macros, which 1139 are now obsolescent. 1140 1141 'make install' now defaults LOCALTIME to Factory not GMT, 1142 which means the default abbreviation is now "-00" not "GMT". 1143 1144 Remove the posix_packrat target, marked obsolescent in 2016a. 1145 1146 1147 Release 2022a - 2022-03-15 23:02:01 -0700 1148 1149 Briefly: 1150 Palestine will spring forward on 2022-03-27, not -03-26. 1151 zdump -v now outputs better failure indications. 1152 Bug fixes for code that reads corrupted TZif data. 1153 1154 Changes to future timestamps 1155 1156 Palestine will spring forward on 2022-03-27, not 2022-03-26. 1157 (Thanks to Heba Hamad.) Predict future transitions for first 1158 Sunday >= March 25. Additionally, predict fallbacks to be the first 1159 Friday on or after October 23, not October's last Friday, to be more 1160 consistent with recent practice. The first differing fallback 1161 prediction is on 2025-10-24, not 2025-10-31. 1162 1163 Changes to past timestamps 1164 1165 From 1992 through spring 1996, Ukraine's DST transitions were at 1166 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) 1167 1168 Chile's Santiago Mean Time and its LMT precursor have been adjusted 1169 eastward by 1 second to align with past and present law. 1170 1171 Changes to commentary 1172 1173 Add several references for Chile's 1946/1947 transitions, some of 1174 which only affected portions of the country. 1175 1176 Changes to code 1177 1178 Fix bug when mktime gets confused by truncated TZif files with 1179 unspecified local time. (Problem reported by Almaz Mingaleev.) 1180 1181 Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. 1182 (Problem reported by Christos Zoulas.) 1183 1184 When reading a version 2 or later TZif file, the TZif reader now 1185 validates the version 1 header and data block only enough to skip 1186 over them, as recommended by RFC 8536 section 4. Also, the TZif 1187 reader no longer mistakenly attempts to parse a version 1 TZIf 1188 file header as a TZ string. 1189 1190 zdump -v now outputs "(localtime failed)" and "(gmtime failed)" 1191 when local time and UT cannot be determined for a timestamp. 1192 1193 Changes to build procedure 1194 1195 Distribution tarballs now use standard POSIX.1-1988 ustar format 1196 instead of GNU format. Although the formats are almost identical 1197 for these tarballs, ustar headers' magic fields contain "ustar" 1198 instead of "ustar ", and their version fields contain "00" instead 1199 of " ". The two formats are planned to diverge more significantly 1200 for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar 1201 format becomes obsolete and the tarballs switch to pax format, an 1202 extension of ustar. For details about these formats, please see 1203 "pax - portable archive interchange", IEEE Std 1003.1-2017, 1204 <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>. 1205 1206 1207 Release 2021e - 2021-10-21 18:41:00 -0700 1208 1209 Changes to future timestamps 1210 1211 Palestine will fall back 10-29 (not 10-30) at 01:00. 1212 (Thanks to P Chan and Heba Hemad.) 1213 1214 1215 Release 2021d - 2021-10-15 13:48:18 -0700 1216 1217 Briefly: 1218 Fiji suspends DST for the 2021/2022 season. 1219 'zic -r' marks unspecified timestamps with "-00". 1220 1221 Changes to future timestamps 1222 1223 Fiji will suspend observance of DST for the 2021/2022 season. 1224 Assume for now that it will return next year. (Thanks to Jashneel 1225 Kumar and P Chan.) 1226 1227 Changes to code 1228 1229 'zic -r' now uses "-00" time zone abbreviations for intervals 1230 with UT offsets that are unspecified due to -r truncation. 1231 This implements a change in draft Internet RFC 8536bis. 1232 1233 1234 Release 2021c - 2021-10-01 14:21:49 -0700 1235 1236 Briefly: 1237 Revert most 2021b changes to 'backward'. 1238 Fix 'zic -b fat' bug in pre-1970 32-bit data. 1239 Fix two Link line typos. 1240 Distribute SECURITY file. 1241 1242 This release is intended as a bugfix release, to fix compatibility 1243 problems and typos reported since 2021b was released. 1244 1245 Changes to Link directives 1246 1247 Revert almost all of 2021b's changes to the 'backward' file, 1248 by moving Link directives back to where they were in 2021a. 1249 Although 'zic' doesn't care which source file contains a Link 1250 directive, some downstream uses ran into trouble with the move. 1251 (Problem reported by Stephen Colebourne for Joda-Time.) 1252 1253 Fix typo that linked Atlantic/Jan_Mayen to the wrong location 1254 (problem reported by Chris Walton). 1255 1256 Fix 'backzone' typo that linked America/Virgin to the wrong 1257 location (problem reported by Michael Deckers). 1258 1259 Changes to code 1260 1261 Fix a bug in 'zic -b fat' that caused old timestamps to be 1262 mishandled in 32-bit-only readers (problem reported by Daniel 1263 Fischer). 1264 1265 Changes to documentation 1266 1267 Distribute the SECURITY file (problem reported by Andreas Radke). 1268 1269 1270 Release 2021b - 2021-09-24 16:23:00 -0700 1271 1272 Briefly: 1273 Jordan now starts DST on February's last Thursday. 1274 Samoa no longer observes DST. 1275 Merge more location-based Zones whose timestamps agree since 1970. 1276 Move some backward-compatibility links to 'backward'. 1277 Rename Pacific/Enderbury to Pacific/Kanton. 1278 Correct many pre-1993 transitions in Malawi, Portugal, etc. 1279 zic now creates each output file or link atomically. 1280 zic -L no longer omits the POSIX TZ string in its output. 1281 zic fixes for truncation and leap second table expiration. 1282 zic now follows POSIX for TZ strings using all-year DST. 1283 Fix some localtime crashes and bugs in obscure cases. 1284 zdump -v now outputs more-useful boundary cases. 1285 tzfile.5 better matches a draft successor to RFC 8536. 1286 A new file SECURITY. 1287 1288 This release is prompted by recent announcements by Jordan and Samoa. 1289 It incorporates many other changes that had accumulated since 2021a. 1290 However, it omits most proposed changes that merged all Zones 1291 agreeing since 1970, as concerns were raised about doing too many of 1292 these changes at once. It does keeps some of these changes in the 1293 interest of making tzdb more equitable one step at a time; see 1294 "Merge more location-based Zones" below. 1295 1296 Changes to future timestamps 1297 1298 Jordan now starts DST on February's last Thursday. 1299 (Thanks to Steffen Thorsen.) 1300 1301 Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) 1302 1303 Changes to zone name 1304 1305 Rename Pacific/Enderbury to Pacific/Kanton. When we added 1306 Enderbury in 1993, we did not know that it is uninhabited and that 1307 Kanton (population two dozen) is the only inhabited location in 1308 that timezone. The old name is now a backward-compatibility link. 1309 1310 Changes to past timestamps 1311 1312 Correct many pre-1993 transitions, fixing entries originally 1313 derived from Shanks, Whitman, and Mundell. The fixes include: 1314 - Barbados: standard time was introduced in 1911, not 1932; and 1315 DST was observed in 1942-1944 1316 - Cook Islands: In 1899 they switched from east to west of GMT, 1317 celebrating Christmas for two days. They (and Niue) switched 1318 to standard time in 1952, not 1901. 1319 - Guyana: corrected LMT for Georgetown; the introduction of 1320 standard time in 1911, not 1915; and corrections to 1975 and 1321 1992 transitions 1322 - Kanton: uninhabited before 1937-08-31 1323 - Niue: only observed -11:20 from 1952 through 1964, then went to 1324 -11 instead of -11:30 1325 - Portugal: DST was observed in 1950 1326 - Tonga: corrected LMT; the introduction of standard time in 1945, 1327 not 1901; and corrections to the transition from +12:20 to +13 1328 in 1961, not 1941 1329 Additional fixes to entries in the 'backzone' file include: 1330 - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 1331 - The Gambia: 1933 and 1942 transitions 1332 - Malawi: several 1911 through 1925 transitions 1333 - Sierra Leone: several 1913 through 1941 transitions, and DST 1334 was NOT observed in 1957 through 1962 1335 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and 1336 Alois Treindl.) 1337 1338 Merge more location-based Zones whose timestamps agree since 1970, 1339 as pre-1970 timestamps are out of scope. This is part of a 1340 process that has been ongoing since 2013. This does not affect 1341 post-1970 timestamps, and timezone historians who build with 'make 1342 PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. 1343 When merging, keep the most-populous location's data, and move 1344 data for other locations to 'backzone' with a backward 1345 link in 'backward'. For example, move America/Creston data to 1346 'backzone' with a link in 'backward' from America/Phoenix because 1347 the two timezones' timestamps agree since 1970; this change 1348 affects some pre-1968 timestamps in America/Creston because 1349 Creston and Phoenix disagreed before 1968. The affected Zones 1350 are Africa/Accra, America/Atikokan, America/Blanc-Sablon, 1351 America/Creston, America/Curacao, America/Nassau, 1352 America/Port_of_Spain, Antarctica/DumontDUrville, and 1353 Antarctica/Syowa. 1354 1355 Changes to maintenance procedure 1356 1357 The new file SECURITY covers how to report security-related bugs. 1358 1359 Several backward-compatibility links have been moved to the 1360 'backward' file. These links, which range from Africa/Addis_Ababa 1361 to Pacific/Saipan, are only for compatibility with now-obsolete 1362 guidelines suggesting an entry for every ISO 3166 code. 1363 The intercontinental convenience links Asia/Istanbul and 1364 Europe/Nicosia have also been moved to 'backward'. 1365 1366 Changes to code 1367 1368 zic now creates each output file or link atomically, 1369 possibly by creating a temporary file and then renaming it. 1370 This avoids races where a TZ setting would temporarily stop 1371 working while zic was installing a replacement file or link. 1372 1373 zic -L no longer omits the POSIX TZ string in its output. 1374 Starting with 2020a, zic -L truncated its output according to the 1375 "Expires" directive or "#expires" comment in the leapseconds file. 1376 The resulting TZif files omitted daylight saving transitions after 1377 the leap second table expired, which led to far less accurate 1378 predictions of times after the expiry. Although future timestamps 1379 cannot be converted accurately in the presence of leap seconds, it 1380 is more accurate to convert near-future timestamps with a few 1381 seconds error than with an hour error, so zic -L no longer 1382 truncates output in this way. 1383 1384 Instead, when zic -L is given the "Expires" directive, it now 1385 outputs the expiration by appending a no-change entry to the leap 1386 second table. Although this should work well with most TZif 1387 readers, it does not conform to Internet RFC 8536 and some pickier 1388 clients (including tzdb 2017c through 2021a) reject it, so 1389 "Expires" directives are currently disabled by default. To enable 1390 them, set the EXPIRES_LINE Makefile variable. If a TZif file uses 1391 this new feature it is marked with a new TZif version number 4, 1392 a format intended to be documented in a successor to RFC 8536. 1393 The old-format "#expires" comments are now treated solely as 1394 comments and have no effect on the TZif files. 1395 1396 zic -L LEAPFILE -r @LO no longer generates an invalid TZif file 1397 that omits leap second information for the range LO..B when LO 1398 falls between two leap seconds A and B. Instead, it generates a 1399 TZif version 4 file that represents the previously missing 1400 information. 1401 1402 The TZif reader now allows the leap second table to begin with a 1403 correction other than -1 or +1, and to contain adjacent 1404 transitions with equal corrections. This supports TZif version 4. 1405 1406 The TZif reader now lets leap seconds occur less than 28 days 1407 apart. This supports possible future TZif extensions. 1408 1409 Fix bug that caused 'localtime' etc. to crash when TZ was 1410 set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does 1411 not conform to POSIX but does conform to Internet RFC 8536. 1412 1413 Fix another bug that caused 'localtime' etc. to crash when TZ was 1414 set to a POSIX-conforming but unusual TZ string like 1415 "EST5EDT4,0/0,J365/0", where almost all the year is DST. 1416 1417 Fix yet another bug that caused 'localtime' etc. to mishandle slim 1418 TZif files containing leap seconds after the last explicit 1419 transition in the table, or when handling far-future timestamps 1420 in slim TZif files lacking leap seconds. 1421 1422 Fix localtime misbehavior involving positive leap seconds. 1423 This change affects only behavior for "right" system time, 1424 which contains leap seconds, and only if the UT offset is 1425 not a multiple of 60 seconds when a positive leap second occurs. 1426 (No such timezone exists in tzdb, luckily.) Without the fix, 1427 the timestamp was ambiguous during a positive leap second. 1428 With the fix, any seconds occurring after a positive leap second 1429 and within the same localtime minute are counted through 60, not 1430 through 59; their UT offset (tm_gmtoff) is the same as before. 1431 Here is how the fix affects timestamps in a timezone with UT 1432 offset +01:23:45 (5025 seconds) and with a positive leap second at 1433 1972-06-30 23:59:60 UTC (78796800): 1434 1435 time_t without the fix with the fix 1436 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 1437 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 1438 ... 1439 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 1440 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 1441 1442 Fix an unlikely bug that caused 'localtime' etc. to misbehave if 1443 civil time changes a few seconds before time_t wraps around, when 1444 leap seconds are enabled. 1445 1446 Fix bug in zic -r; in some cases, the dummy time type after the 1447 last time transition disagreed with the TZ string, contrary to 1448 Internet RFC 8563 section 3.3. 1449 1450 Fix a bug with 'zic -r @X' when X is a negative leap second that 1451 has a nonnegative correction. Without the fix, the output file 1452 was truncated so that X appeared to be a positive leap second. 1453 Fix a similar, even less likely bug when truncating at a positive 1454 leap second that has a nonpositive correction. 1455 1456 zic -r now reports an error if given rolling leap seconds, as this 1457 usage has never generally worked and is evidently unused. 1458 1459 zic now generates a POSIX-conforming TZ string for TZif files 1460 where all-year DST is predicted for the indefinite future. 1461 For example, for all-year Eastern Daylight Time, zic now generates 1462 "XXX3EDT4,0/0,J365/23" where it previously generated 1463 "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for 1464 noting the possibility of POSIX conformance.) 1465 1466 zic.c no longer requires sys/wait.h (thanks to spazmodius for 1467 noting it wasn't needed). 1468 1469 When reading slim TZif files, zdump no longer mishandles leap 1470 seconds on the rare platforms where time_t counts leap seconds, 1471 fixing a bug introduced in 2014g. 1472 1473 zdump -v now outputs timestamps at boundaries of what localtime 1474 and gmtime can represent, instead of the less useful timestamps 1475 one day after the minimum and one day before the maximum. 1476 (Thanks to Arthur David Olson for prototype code, and to Manuela 1477 Friedrich for debugging help.) 1478 1479 zdump's -c and -t options are now consistently inclusive for the 1480 lower time bound and exclusive for the upper. Formerly they were 1481 inconsistent. (Confusion noted by Martin Burnicki.) 1482 1483 Changes to build procedure 1484 1485 You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to 1486 non-POSIX hosts where malloc doesn't set errno. 1487 (Problem reported by Jan Engelhardt.) 1488 1489 Changes to documentation 1490 1491 tzfile.5 better matches a draft successor to RFC 8536 1492 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>. 1493 1494 1495 Release 2021a - 2021-01-24 10:54:57 -0800 1496 1497 Changes to future timestamps 1498 1499 South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. 1500 (Thanks to Steffen Thorsen.) 1501 1502 1503 Release 2020f - 2020-12-29 00:17:46 -0800 1504 1505 Change to build procedure 1506 1507 'make rearguard_tarballs' no longer generates a bad rearguard.zi, 1508 fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) 1509 1510 1511 Release 2020e - 2020-12-22 15:14:34 -0800 1512 1513 Briefly: 1514 Volgograd switches to Moscow time on 2020-12-27 at 02:00. 1515 1516 Changes to future timestamps 1517 1518 Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. 1519 (Thanks to Alexander Krivenyshev and Stepan Golosunov.) 1520 1521 Changes to past timestamps 1522 1523 Correct many pre-1986 transitions, fixing entries originally 1524 derived from Shanks. The fixes include: 1525 - Australia: several 1917 through 1971 transitions 1526 - The Bahamas: several 1941 through 1945 transitions 1527 - Bermuda: several 1917 through 1956 transitions 1528 - Belize: several 1942 through 1968 transitions 1529 - Ghana: several 1915 through 1956 transitions 1530 - Israel and Palestine: several 1940 through 1985 transitions 1531 - Kenya and adjacent: several 1908 through 1960 transitions 1532 - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 1533 through 1919 transitions 1534 - Seychelles: the introduction of standard time in 1907, not 1906 1535 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition 1536 (Thanks to P Chan.) 1537 1538 Because of the Australia change, Australia/Currie (King Island) is 1539 no longer needed, as it is identical to Australia/Hobart for all 1540 timestamps since 1970 and was therefore created by mistake. 1541 Australia/Currie has been moved to the 'backward' file and its 1542 corrected data moved to the 'backzone' file. 1543 1544 Changes to past time zone abbreviations and DST flags 1545 1546 To better match legislation in Turks and Caicos, the 2015 shift to 1547 year-round observance of -04 is now modeled as AST throughout before 1548 returning to Eastern Time with US DST in 2018, rather than as 1549 maintaining EDT until 2015-11-01. (Thanks to P Chan.) 1550 1551 Changes to documentation 1552 1553 The zic man page now documents zic's coalescing of transitions 1554 when a zone falls back just before DST springs forward. 1555 1556 1557 Release 2020d - 2020-10-21 11:24:13 -0700 1558 1559 Briefly: 1560 Palestine ends DST earlier than predicted, on 2020-10-24. 1561 1562 Changes to past and future timestamps 1563 1564 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 1565 as previously predicted (thanks to Sharef Mustafa.) Its 1566 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen 1567 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and 1568 its spring 2020 transition was on March 28 at 00:00, not March 27 1569 (thanks to Pierre Cashon.) This affects Asia/Gaza and 1570 Asia/Hebron. Assume future spring and fall transitions will be on 1571 the Saturday preceding the last Sunday of March and October, 1572 respectively. 1573 1574 1575 Release 2020c - 2020-10-16 11:15:53 -0700 1576 1577 Briefly: 1578 Fiji starts DST later than usual, on 2020-12-20. 1579 1580 Changes to future timestamps 1581 1582 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as 1583 previously predicted. DST will still end on 2021-01-17. 1584 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that 1585 the later-than-usual start date is a one-time departure from the 1586 recent pattern. 1587 1588 Changes to build procedure 1589 1590 Rearguard tarballs now contain an empty file pacificnew. 1591 Some older downstream software expects this file to exist. 1592 (Problem reported by Mike Cullinan.) 1593 1594 1595 Release 2020b - 2020-10-06 18:35:04 -0700 1596 1597 Briefly: 1598 Revised predictions for Morocco's changes starting in 2023. 1599 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. 1600 Macquarie Island has stayed in sync with Tasmania since 2011. 1601 Casey, Antarctica is at +08 in winter and +11 in summer. 1602 zic no longer supports -y, nor the TYPE field of Rules. 1603 1604 Changes to future timestamps 1605 1606 Morocco's spring-forward after Ramadan is now predicted to occur 1607 no sooner than two days after Ramadan, instead of one day. 1608 (Thanks to Milamber.) The first altered prediction is for 2023, 1609 now predicted to spring-forward on April 30 instead of April 23. 1610 1611 Changes to past and future timestamps 1612 1613 Casey Station, Antarctica has been using +08 in winter and +11 in 1614 summer since 2018. The most recent transition from +08 to +11 was 1615 2020-10-04 00:01. Also, Macquarie Island has been staying in 1616 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) 1617 1618 Changes to past and future time zone abbreviations and DST flags 1619 1620 Canada's Yukon, represented by America/Whitehorse and 1621 America/Dawson, changes its time zone rules from -08/-07 to 1622 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. 1623 This change affects only the time zone abbreviation (MST vs PDT) 1624 and daylight saving flag for the period between the two dates. 1625 (Thanks to Andrew G. Smith.) 1626 1627 Changes to past timestamps 1628 1629 Correct several transitions for Hungary for 1918/1983. 1630 For example, the 1983-09-25 fall-back was at 01:00, not 03:00. 1631 (Thanks to Gza Nyry.) Also, the 1890 transition to standard 1632 time was on 11-01, not 10-01 (thanks to Michael Deckers). 1633 1634 The 1891 French transition was on March 16, not March 15. The 1635 1911-03-11 French transition was at midnight, not a minute later. 1636 Monaco's transitions were on 1892-06-01 and 1911-03-29, not 1637 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) 1638 1639 Changes to code 1640 1641 Support for zic's long-obsolete '-y YEARISTYPE' option has been 1642 removed and, with it, so has support for the TYPE field in Rule 1643 lines, which is now reserved for compatibility with earlier zic. 1644 These features were previously deprecated in release 2015f. 1645 (Thanks to Tim Parenti.) 1646 1647 zic now defaults to '-b slim' instead of to '-b fat'. 1648 1649 zic's new '-l -' and '-p -' options uninstall any existing 1650 localtime and posixrules files, respectively. 1651 1652 The undocumented and ineffective tzsetwall function has been 1653 removed. 1654 1655 Changes to build procedure 1656 1657 The Makefile now defaults POSIXRULES to '-', so the posixrules 1658 feature (obsolete as of 2019b) is no longer installed by default. 1659 1660 Changes to documentation and commentary 1661 1662 The long-obsolete files pacificnew, systemv, and yearistype.sh have 1663 been removed from the distribution. (Thanks to Tim Parenti.) 1664 1665 1666 Release 2020a - 2020-04-23 16:03:47 -0700 1667 1668 Briefly: 1669 Morocco springs forward on 2020-05-31, not 2020-05-24. 1670 Canada's Yukon advanced to -07 year-round on 2020-03-08. 1671 America/Nuuk renamed from America/Godthab. 1672 zic now supports expiration dates for leap second lists. 1673 1674 Changes to future timestamps 1675 1676 Morocco's second spring-forward transition in 2020 will be May 31, 1677 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) 1678 Adjust future-year predictions to use the first Sunday after the 1679 day after Ramadan, not the first Sunday after Ramadan. 1680 1681 Canada's Yukon, represented by America/Whitehorse and 1682 America/Dawson, advanced to -07 year-round, beginning with its 1683 spring-forward transition on 2020-03-08, and will not fall back on 1684 2020-11-01. Although a government press release calls this 1685 "permanent Pacific Daylight Saving Time", we prefer MST for 1686 consistency with nearby Dawson Creek, Creston, and Fort Nelson. 1687 (Thanks to Tim Parenti.) 1688 1689 Changes to past timestamps 1690 1691 Shanghai observed DST in 1919. (Thanks to Phake Nick.) 1692 1693 Changes to timezone identifiers 1694 1695 To reflect current usage in English better, America/Godthab has 1696 been renamed to America/Nuuk. A backwards-compatibility link 1697 remains for the old name. 1698 1699 Changes to code 1700 1701 localtime.c no longer mishandles timestamps after the last 1702 transition in a TZif file with leap seconds and with daylight 1703 saving time transitions projected into the indefinite future. 1704 For example, with TZ='America/Los_Angeles' with leap seconds, 1705 zdump formerly reported a DST transition on 2038-03-14 1706 from 01:59:32.999... to 02:59:33 instead of the correct transition 1707 from 01:59:59.999... to 03:00:00. 1708 1709 zic -L now supports an Expires line in the leapseconds file, and 1710 truncates the TZif output accordingly. This propagates leap 1711 second expiration information into the TZif file, and avoids the 1712 abovementioned localtime.c bug as well as similar bugs present in 1713 many client implementations. If no Expires line is present, zic 1714 -L instead truncates the TZif output based on the #expires comment 1715 present in leapseconds files distributed by tzdb 2018f and later; 1716 however, this usage is obsolescent. For now, the distributed 1717 leapseconds file has an Expires line that is commented out, so 1718 that the file can be fed to older versions of zic which ignore the 1719 commented-out line. Future tzdb distributions are planned to 1720 contain a leapseconds file with an Expires line. 1721 1722 The configuration macros HAVE_TZNAME and USG_COMPAT should now be 1723 set to 1 if the system library supports the feature, and 2 if not. 1724 As before, these macros are nonzero if tzcode should support the 1725 feature, zero otherwise. 1726 1727 The configuration macro ALTZONE now has the same values with the 1728 same meaning as HAVE_TZNAME and USG_COMPAT. 1729 1730 The code's defense against CRLF in leap-seconds.list is now 1731 portable to POSIX awk. (Problem reported by Deborah Goldsmith.) 1732 1733 Although the undocumented tzsetwall function is not changed in 1734 this release, it is now deprecated in preparation for removal in 1735 future releases. Due to POSIX requirements, tzsetwall has not 1736 worked for some time. Any code that uses it should instead use 1737 tzalloc(NULL) or, if portability trumps thread-safety, should 1738 unset the TZ environment variable. 1739 1740 Changes to commentary 1741 1742 The les-de-la-Madeleine and the Listuguj reserve are noted as 1743 following America/Halifax, and comments about Yukon's "south" and 1744 "north" have been corrected to say "east" and "west". (Thanks to 1745 Jeffery Nichols.) 1746 1747 1748 Release 2019c - 2019-09-11 08:59:48 -0700 1749 1750 Briefly: 1751 Fiji observes DST from 2019-11-10 to 2020-01-12. 1752 Norfolk Island starts observing Australian-style DST. 1753 1754 Changes to future timestamps 1755 1756 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 1757 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) 1758 Adjust future guesses accordingly. 1759 1760 Norfolk Island will observe Australian-style DST starting in 1761 spring 2019. The first transition is on 2019-10-06. (Thanks to 1762 Kyle Czech and Michael Deckers.) 1763 1764 Changes to past timestamps 1765 1766 Many corrections to time in Turkey from 1940 through 1985. 1767 (Thanks to Oya Vula via Alois Treindl, and to Kvan Yazan.) 1768 1769 The Norfolk Island 1975-03-02 transition was at 02:00 standard 1770 time, not 02:00 DST. (Thanks to Michael Deckers.) 1771 1772 South Korea observed DST from 1948 through 1951. Although this 1773 info was supposed to appear in release 2014j, a typo inadvertently 1774 suppressed the change. (Thanks to Alois Treindl.) 1775 1776 Detroit observed DST in 1967 and 1968 following the US DST rules, 1777 except that its 1967 DST began on June 14 at 00:01. (Thanks to 1778 Alois Treindl for pointing out that the old data entries were 1779 probably wrong.) 1780 1781 Fix several errors in pre-1970 transitions in Perry County, IN. 1782 (Thanks to Alois Treindl for pointing out the 1967/9 errors.) 1783 1784 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver 1785 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 1786 10-06. In 1945 Knigsberg (now Kaliningrad) switched from +01/+02 1787 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated 1788 EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 1789 Knigsberg switched to +03 on 04-07 not 01-01. 1790 1791 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 1792 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) 1793 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. 1794 1795 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. 1796 (Thanks to Michael Deckers.) 1797 1798 Changes to past time zone abbreviations and DST flags 1799 1800 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, 1801 is now flagged as DST and is abbreviated HKWT not HKT. 1802 1803 Changes to code 1804 1805 leapseconds.awk now relies only on its input data, rather than 1806 also relying on its comments. (Inspired by code from Dennis 1807 Ferguson and Chris Woodbury.) 1808 1809 The code now defends against CRLFs in leap-seconds.list. 1810 (Thanks to Brian Inglis and Chris Woodbury.) 1811 1812 Changes to documentation and commentary 1813 1814 theory.html discusses leap seconds. (Thanks to Steve Summit.) 1815 1816 Nashville's newspapers dueled about the time of day in the 1950s. 1817 (Thanks to John Seigenthaler.) 1818 1819 Liechtenstein observed Swiss DST in 1941/2. 1820 (Thanks to Alois Treindl.) 1821 1822 1823 Release 2019b - 2019-07-01 00:09:53 -0700 1824 1825 Briefly: 1826 Brazil no longer observes DST. 1827 'zic -b slim' outputs smaller TZif files; please try it out. 1828 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 1829 1830 Changes to future timestamps 1831 1832 Brazil has canceled DST and will stay on standard time indefinitely. 1833 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 1834 Oliveira.) 1835 1836 Predictions for Morocco now go through 2087 instead of 2037, to 1837 work around a problem on newlib when using TZif files output by 1838 zic 2019a or earlier. (Problem reported by David Gauchard.) 1839 1840 Changes to past and future timestamps 1841 1842 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 1843 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 1844 future transitions to be March's last Friday at 00:00. 1845 1846 Changes to past timestamps 1847 1848 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 1849 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 1850 not 09-15 at 00:00. In 1946 its spring-forward transition was on 1851 04-21 at 00:00, not the previous day at 03:30. From 1946 through 1852 1952 its fall-back transitions occurred at 04:30, not at 03:30. 1853 In 1947 its fall-back transition was on 11-30, not 12-30. 1854 (Thanks to P Chan.) 1855 1856 Changes to past time zone abbreviations 1857 1858 Italy's 1866 transition to Rome Mean Time was on December 12, not 1859 September 22. This affects only the time zone abbreviation for 1860 Europe/Rome between those dates. (Thanks to Stephen Trainor and 1861 Luigi Rosa.) 1862 1863 Changes affecting metadata only 1864 1865 Add info about the Crimea situation in zone1970.tab and zone.tab. 1866 (Problem reported by Serhii Demediuk.) 1867 1868 Changes to code 1869 1870 zic's new -b option supports a way to control data bloat and to 1871 test for year-2038 bugs in software that reads TZif files. 1872 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 1873 for example, changing from fat to slim shrinks the Europe/London 1874 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 1875 files represent the same set of timestamps and use the same TZif 1876 format as documented in tzfile(5) and in Internet RFC 8536. 1877 Fat format attempts to work around bugs or incompatibilities in 1878 older software, notably software that mishandles 64-bit TZif data 1879 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 1880 Slim format is more efficient and does not work around 64-bit bugs 1881 or obsolete TZ strings. Currently zic defaults to fat format 1882 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 1883 out-of-the-box default is intended to change in future releases 1884 as the buggy software often mishandles timestamps anyway. 1885 1886 zic no longer treats a set of rules ending in 2037 specially. 1887 Previously, zic assumed that such a ruleset meant that future 1888 timestamps could not be predicted, and therefore omitted a 1889 POSIX-like TZ string in the TZif output. The old behavior is no 1890 longer needed for current tzdata, and caused problems with newlib 1891 when used with older tzdata (reported by David Gauchard). 1892 1893 zic no longer generates some artifact transitions. For example, 1894 Europe/London no longer has a no-op transition in January 1996. 1895 1896 Changes to build procedure 1897 1898 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 1899 by a percent or so. 1900 1901 Changes to documentation and commentary 1902 1903 The Makefile now documents the POSIXRULES macro as being obsolete, 1904 and similarly, zic's -p POSIXRULES option is now documented as 1905 being obsolete. Although the POSIXRULES feature still exists and 1906 works as before, in practice it is rarely used for its intended 1907 purpose, and it does not work either in the default reference 1908 implementation (for timestamps after 2037) or in common 1909 implementations such as GNU/Linux (for contemporary timestamps). 1910 Since POSIXRULES was designed primarily as a temporary transition 1911 facility for System V platforms that died off decades ago, it is 1912 being decommissioned rather than institutionalized. 1913 1914 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 1915 1916 1917 Release 2019a - 2019-03-25 22:01:33 -0700 1918 1919 Briefly: 1920 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 1921 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 1922 1923 Changes to past and future timestamps 1924 1925 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 1926 previously predicted. Adjust our prediction by guessing that spring 1927 transitions will be between 24 and 30 March, which matches recent practice 1928 since 2016. (Thanks to Even Scharning and Tim Parenti.) 1929 1930 Metlakatla ended its observance of Pacific standard time, 1931 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 1932 Stanley and Tim Parenti.) 1933 1934 Changes to past timestamps 1935 1936 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 1937 (Thanks to Alois Treindl and Isaac Starkman.) 1938 1939 Changes to time zone abbreviations 1940 1941 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 1942 of being a separate zone that generates the abbreviation "UCT", 1943 which nowadays is typically a typo. (Problem reported by Isiah 1944 Meadows.) 1945 1946 Changes to code 1947 1948 zic now has an -r option to limit the time range of output data. 1949 For example, 'zic -r @1000000000' limits the output data to 1950 timestamps starting 1000000000 seconds after the Epoch. 1951 This helps shrink output size and can be useful for applications 1952 not needing the full timestamp history, such as TZDIST truncation; 1953 see Internet RFC 8536 section 5.1. (Inspired by a feature request 1954 from Christopher Wong, helped along by bug reports from Wong and 1955 from Tim Parenti.) 1956 1957 Changes to documentation 1958 1959 Mention Internet RFC 8536 (February 2019), which documents TZif. 1960 1961 tz-link.html now cites tzdata-meta 1962 <https://tzdata-meta.timtimeonline.com/>. 1963 1964 1965 Release 2018i - 2018-12-30 11:05:43 -0800 1966 1967 Briefly: 1968 So Tom and Prncipe switches from +01 to +00 on 2019-01-01. 1969 1970 Changes to future timestamps 1971 1972 Due to a change in government, So Tom and Prncipe switches back 1973 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 1974 Nasardinov and Michael Deckers.) 1975 1976 1977 Release 2018h - 2018-12-23 17:59:32 -0800 1978 1979 Briefly: 1980 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 1981 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 1982 Metlakatla, Alaska observes PST this winter only. 1983 Guess Morocco will continue to adjust clocks around Ramadan. 1984 Add predictions for Iran from 2038 through 2090. 1985 1986 Changes to future timestamps 1987 1988 Guess that Morocco will continue to fall back just before and 1989 spring forward just after Ramadan, the practice since 2012. 1990 (Thanks to Maamar Abdelkader.) This means Morocco will observe 1991 negative DST during Ramadan in main and vanguard formats, and in 1992 rearguard format it stays in the +00 timezone and observes 1993 ordinary DST in all months other than Ramadan. As before, extend 1994 this guesswork to the year 2037. As a consequence, Morocco is 1995 scheduled to observe three DST transitions in some Gregorian years 1996 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 1997 calendars. 1998 1999 The table of exact transitions for Iranian DST has been extended. 2000 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 2001 It now cuts off before 2091 as there is doubt about how the Persian 2002 calendar will treat 2091. This change predicts DST transitions in 2003 2038-9, 2042-3, and 2046-7 to occur one day later than previously 2004 predicted. As before, post-cutoff transitions are approximated. 2005 2006 Changes to past and future timestamps 2007 2008 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 2009 +05 on 2018-12-21. This is a zone split as Qostanay (aka 2010 Kostanay) did not switch, so create a zone Asia/Qostanay. 2011 2012 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 2013 It did not change clocks that day and remains on -08 this winter. 2014 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 2015 rules next spring, so this change affects only timestamps 2016 from 2018-11-04 through 2019-03-10. 2017 2018 Change to past timestamps 2019 2020 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 2021 not 00:00. I transcribed the time incorrectly from Shanks. 2022 (Thanks to Phake Nick.) 2023 2024 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 2025 (Thanks to Phake Nick.) 2026 2027 Guam observed DST irregularly from 1959 through 1977. 2028 (Thanks to Phake Nick.) 2029 2030 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 2031 10-01 changed standard time to +08:30 (not +08). Its transition 2032 back to +08 after WWII was on 1945-09-15, not the previous day. 2033 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 2034 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 2035 its 1952 fallback was on 11-02 (not 10-25). 2036 2037 This release contains many changes to timestamps before 1946 due 2038 to Japanese possession or occupation of Pacific/Chuuk, 2039 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 2040 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 2041 (Thanks to Phake Nick.) 2042 2043 Assume that the Spanish East Indies was like the Philippines and 2044 observed American time until the end of 1844. This affects 2045 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 2046 2047 Changes to past tm_isdst flags 2048 2049 For the recent Morocco change, the tm_isdst flag should be 1 from 2050 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 2051 Give a URL to the official decree. (Thanks to Matt Johnson.) 2052 2053 2054 Release 2018g - 2018-10-26 22:22:45 -0700 2055 2056 Briefly: 2057 Morocco switches to permanent +01 on 2018-10-28. 2058 2059 Changes to future timestamps 2060 2061 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 2062 so its clocks will not fall back as previously scheduled. 2063 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 2064 2065 Changes to code 2066 2067 When generating TZif files with leap seconds, zic no longer uses a 2068 format that trips up older 32-bit clients, fixing a bug introduced 2069 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 2070 for QTBUG-53071 now also works for TZif files with leap seconds. 2071 2072 The translator to rearguard format now rewrites the line 2073 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 2074 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 2075 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 2076 and earlier. (Reported by Christos Zoulas.) 2077 2078 Changes to past time zone abbreviations 2079 2080 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 2081 This reverts to 2011h, as the abbreviation change in 2011i was 2082 likely inadvertent. 2083 2084 Changes to documentation 2085 2086 tzfile.5 has new sections on interoperability issues. 2087 2088 2089 Release 2018f - 2018-10-18 00:14:18 -0700 2090 2091 Briefly: 2092 Volgograd moves from +03 to +04 on 2018-10-28. 2093 Fiji ends DST 2019-01-13, not 2019-01-20. 2094 Most of Chile changes DST dates, effective 2019-04-06. 2095 2096 Changes to future timestamps 2097 2098 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 2099 (Thanks to Alexander Fetisov and Stepan Golosunov.) 2100 2101 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 2102 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 2103 accordingly. 2104 2105 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 2106 time, and resume DST on the first Saturday in September at 24:00 mainland 2107 time. The changes are effective from 2019-04-06, and do not affect the 2108 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 2109 and Tim Parenti.) Adjust future predictions accordingly. 2110 2111 Changes to past timestamps 2112 2113 The 2018-05-05 North Korea 30-minute time zone change took place 2114 at 23:30 the previous day, not at 00:00 that day. 2115 2116 China's 1988 spring-forward transition was on April 17, not 2117 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 2118 (Thanks to P Chan.) 2119 2120 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 2121 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 2122 temporarily switched to +09/+10 during World War II. Macau 2123 observed DST in 1942/79, not 1961/80, and there were several 2124 errors for transition times and dates. (Thanks to P Chan.) 2125 2126 The 1948-1951 fallback transitions in Japan were at 25:00 on 2127 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 2128 zic turns this into 01:00 on the day after September's second 2129 Saturday, which is the best that POSIX or C platforms can do. 2130 2131 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 2132 paper by Li Yu, replacing more-questionable data from Shanks. 2133 2134 Changes to time zone abbreviations 2135 2136 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 2137 2138 Changes to code 2139 2140 zic now always generates TZif files where time type 0 is used for 2141 timestamps before the first transition. This simplifies the 2142 reading of TZif files and should not affect behavior of existing 2143 TZif readers because the same set of time types is used; only 2144 their internal indexes may have changed. This affects only the 2145 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 2146 EET, which previously used nonzero types for these timestamps. 2147 2148 Because of the type 0 change, zic no longer outputs a dummy 2149 transition at time -2**59 (before the Big Bang), as clients should 2150 no longer need this to handle historical timestamps correctly. 2151 This reverts a change introduced in 2013d and shrinks most TZif 2152 files by a few bytes. 2153 2154 zic now supports negative time-of-day in Rule and Leap lines, e.g., 2155 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 2156 occurs at 18:00 on the Saturday before the last Sunday in April. 2157 This behavior was documented in 2018a but the code did not 2158 entirely match the documentation. 2159 2160 localtime.c no longer requires at least one time type in TZif 2161 files that lack transitions or have a POSIX-style TZ string. This 2162 future-proofs the code against possible future extensions to the 2163 format that would allow TZif files with POSIX-style TZ strings and 2164 without transitions or time types. 2165 2166 A read-access subscript error in localtime.c has been fixed. 2167 It could occur only in TZif files with timecnt == 0, something that 2168 does not happen in practice now but could happen in future versions. 2169 2170 localtime.c no longer ignores TZif POSIX-style TZ strings that 2171 specify only standard time. Instead, these TZ strings now 2172 override the default time type for timestamps after the last 2173 transition (or for all timestamps if there are no transitions), 2174 just as DST strings specifying DST have always done. 2175 2176 leapseconds.awk now outputs "#updated" and "#expires" comments, 2177 and supports leap seconds at the ends of months other than June 2178 and December. (Inspired by suggestions from Chris Woodbury.) 2179 2180 Changes to documentation 2181 2182 New restrictions: A Rule name must start with a character that 2183 is neither an ASCII digit nor "-" nor "+", and an unquoted name 2184 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 2185 The latter restriction makes room for future extensions (a 2186 possibility noted by Tom Lane). 2187 2188 tzfile.5 now documents what time types apply before the first and 2189 after the last transition, if any. 2190 2191 Documentation now uses the spelling "timezone" for a TZ setting 2192 that determines timestamp history, and "time zone" for a 2193 geographic region currently sharing the same standard time. 2194 2195 The name "TZif" is now used for the tz binary data format. 2196 2197 tz-link.htm now mentions the A0 TimeZone Migration utilities. 2198 (Thanks to Aldrin Martoq for the link.) 2199 2200 Changes to build procedure 2201 2202 New 'make' target 'rearguard_tarballs' to build the rearguard 2203 tarball only. This is a convenience on platforms that lack lzip 2204 if you want to build the rearguard tarball. (Problem reported by 2205 Deborah Goldsmith.) 2206 2207 tzdata.zi is now more stable from release to release. (Problem 2208 noted by Tom Lane.) It is also a bit shorter. 2209 2210 tzdata.zi now can contain comment lines documenting configuration 2211 information, such as which data format was selected, which input 2212 files were used, and how leap seconds are treated. (Problems 2213 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 2214 are used these comment lines are absent, for backward 2215 compatibility. A redistributor intending to alter its copy of the 2216 files should also append "-LABEL" to the 'version' file's first 2217 line, where "LABEL" identifies the redistributor's change. 2218 2219 2220 Release 2018e - 2018-05-01 23:42:51 -0700 2221 2222 Briefly: 2223 2224 North Korea switches back to +09 on 2018-05-05. 2225 The main format uses negative DST again, for Ireland etc. 2226 'make tarballs' now also builds a rearguard tarball. 2227 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 2228 2229 Changes to past and future timestamps 2230 2231 North Korea switches back from +0830 to +09 on 2018-05-05. 2232 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 2233 and Tim Parenti.) 2234 2235 Bring back the negative-DST changes of 2018a, except be more 2236 compatible with data parsers that do not support negative DST. 2237 Also, this now affects historical timestamps in Namibia and the 2238 former Czechoslovakia, not just Ireland. The main format now uses 2239 negative DST to model timestamps in Europe/Dublin (from 1971 on), 2240 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 2241 does not affect UT offsets, only time zone abbreviations and the 2242 tm_isdst flag. Also, this does not affect rearguard or vanguard 2243 formats; effectively the main format now uses vanguard instead of 2244 rearguard format. Data parsers that do not support negative DST 2245 can still use data from the rearguard tarball described below. 2246 2247 Changes to build procedure 2248 2249 The command 'make tarballs' now also builds the tarball 2250 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 2251 except that it uses rearguard format intended for trailing-edge 2252 data parsers. 2253 2254 Changes to data format and to code 2255 2256 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 2257 suffix, which specifies whether the adjusted time is standard time 2258 or daylight saving time. If no suffix is given, daylight saving 2259 time is used if and only if the SAVE column is nonzero; this is 2260 the longstanding behavior. Although this new feature is not used 2261 in tzdata, it could be used to specify the legal time in Namibia 2262 1994-2017, as opposed to the popular time (see below). 2263 2264 Changes to past timestamps 2265 2266 From 1994 through 2017 Namibia observed DST in winter, not summer. 2267 That is, it used negative DST, as Ireland still does. This change 2268 does not affect UTC offsets; it affects only the tm_isdst flag and 2269 the abbreviation used during summer, which is now CAT, not WAST. 2270 Although (as noted by Michael Deckers) summer and winter time were 2271 both simply called "standard time" in Namibian law, in common 2272 practice winter time was considered to be DST (as noted by Stephen 2273 Colebourne). The full effect of this change is only in vanguard 2274 and main format; in rearguard format, the tm_isdst flag is still 2275 zero in winter and nonzero in summer. 2276 2277 In 1946/7 Czechoslovakia also observed negative DST in winter. 2278 The full effect of this change is only in vanguard and main 2279 formats; in rearguard format, it is modeled as plain GMT without 2280 daylight saving. Also, the dates of some 1944/5 DST transitions 2281 in Czechoslovakia have been changed. 2282 2283 2284 Release 2018d - 2018-03-22 07:05:46 -0700 2285 2286 Briefly: 2287 2288 Palestine starts DST a week earlier in 2018. 2289 Add support for vanguard and rearguard data consumers. 2290 Add subsecond precision to source data format, though not to data. 2291 2292 Changes to future timestamps 2293 2294 In 2018, Palestine starts DST on March 24, not March 31. 2295 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 2296 2297 Changes to past and future timestamps 2298 2299 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 2300 at 04:00. (Thanks to Steffen Thorsen.) 2301 2302 Changes to past timestamps 2303 2304 Historical transitions for Uruguay, represented by 2305 America/Montevideo, have been updated per official legal documents, 2306 replacing previous data mainly originating from the inventions of 2307 Shanks & Pottenger. This has resulted in adjustments ranging from 2308 30 to 90 minutes in either direction over at least two dozen 2309 distinct periods ranging from one day to several years in length. 2310 A mere handful of pre-1991 transitions are unaffected; data since 2311 then has come from more reliable contemporaneous reporting. These 2312 changes affect various timestamps in 1920-1923, 1936, 1939, 2313 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 2314 Additionally, Uruguay's pre-standard-time UT offset has been 2315 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 2316 match the location of the Observatory of the National Meteorological 2317 Institute in Montevideo. 2318 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 2319 2320 East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. 2321 (Thanks to Kerry Shetline.) 2322 2323 Fix the 1912-01-01 transition for Portugal and its colonies. 2324 This transition was at 00:00 according to the new UT offset, not 2325 according to the old one. Also assume that Cape Verde switched on 2326 the same date as the rest, not in 1907. This affects 2327 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 2328 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 2329 (Thanks to Michael Deckers.) 2330 2331 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 2332 Turks & Caicos. 2333 2334 Changes to past time zone abbreviations 2335 2336 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 2337 is no clock change associated with the transition. 2338 2339 Changes to build procedure 2340 2341 The new DATAFORM macro in the Makefile lets the installer choose 2342 among three source data formats. The idea is to lessen downstream 2343 disruption when data formats are improved. 2344 2345 * DATAFORM=vanguard installs from the latest, bleeding-edge 2346 format. DATAFORM=main (the default) installs from the format 2347 used in the 'africa' etc. files. DATAFORM=rearguard installs 2348 from a trailing-edge format. Eventually, elements of today's 2349 vanguard format should move to the main format, and similarly 2350 the main format's features should eventually move to the 2351 rearguard format. 2352 2353 * In the current version, the main and rearguard formats are 2354 identical and match that of 2018c, so this change does not 2355 affect default behavior. The vanguard format currently contains 2356 one feature not in the main format: negative SAVE values. This 2357 improves support for Ireland, which uses Irish Standard Time 2358 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 2359 supported negative SAVE values for decades, and this feature 2360 should move to the main format soon. However, it will not move 2361 to the rearguard format for quite some time because some 2362 downstream parsers do not support it. 2363 2364 * The build procedure constructs three files vanguard.zi, main.zi, 2365 and rearguard.zi, one for each format. Although the files 2366 represent essentially the same data, they may have minor 2367 discrepancies that users are not likely to notice. The files 2368 are intended for downstream data consumers and are not 2369 installed. Zoneinfo parsers that do not support negative SAVE values 2370 should start using rearguard.zi, so that they will be unaffected 2371 when the negative-DST feature moves from vanguard to main. 2372 Bleeding-edge Zoneinfo parsers that support the new features 2373 already can use vanguard.zi; in this respect, current tzcode is 2374 bleeding-edge. 2375 2376 The Makefile should now be safe for parallelized builds, and 'make 2377 -j to2050new.tzs' is now much faster on a multiprocessor host 2378 with GNU Make. 2379 2380 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 2381 prepends TZDIR/ to file names that do not begin with '/'. This is 2382 not recommended for general use, due to its security implications. 2383 (From a suggestion by Manuela Friedrich.) 2384 2385 Changes to code 2386 2387 zic now accepts subsecond precision in expressions like 2388 00:19:32.13, which is approximately the legal time of the 2389 Netherlands from 1835 to 1937. However, because it is 2390 questionable whether the few recorded uses of non-integer offsets 2391 had subsecond precision in practice, there are no plans for tzdata 2392 to use this feature. (Thanks to Steve Allen for pointing out 2393 the limitations of historical data in this area.) 2394 2395 The code is a bit more portable to MS-Windows. Installers can 2396 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 2397 reserve identifiers like 'localtime'. (Thanks to Manuela 2398 Friedrich.) 2399 2400 Changes to documentation and commentary 2401 2402 theory.html now outlines tzdb's extensions to POSIX's model for 2403 civil time, and has a section "POSIX features no longer needed" 2404 that lists POSIX API components that are now vestigial. 2405 (From suggestions by Steve Summit.) It also better distinguishes 2406 time zones from tz regions. (From a suggestion by Guy Harris.) 2407 2408 Commentary is now more consistent about using the phrase "daylight 2409 saving time", to match the C name tm_isdst. Daylight saving time 2410 need not occur in summer, and need not have a positive offset from 2411 standard time. 2412 2413 Commentary about historical transitions in Uruguay has been expanded 2414 with links to many relevant legal documents. 2415 (Thanks to Tim Parenti.) 2416 2417 Commentary now uses some non-ASCII characters with Unicode value 2418 less than U+0100, as they can be useful and should work even with 2419 older editors such as XEmacs. 2420 2421 2422 Release 2018c - 2018-01-22 23:00:44 -0800 2423 2424 Briefly: 2425 Revert Irish changes that relied on negative SAVE values. 2426 2427 Changes to tm_isdst 2428 2429 Revert the 2018a change to Europe/Dublin. As before, this change 2430 does not affect UT offsets or abbreviations; it affects only 2431 whether timestamps are considered to be standard time or 2432 daylight-saving time, as expressed in the tm_isdst flag of C's 2433 struct tm type. This reversion is intended to be a temporary 2434 workaround for problems discovered with downstream uses of 2435 releases 2018a and 2018b, which implemented Irish time by using 2436 negative SAVE values in the Eire rules of the 'europe' file. 2437 Although negative SAVE values have been part of tzcode for many 2438 years and are supported by many platforms, they were not 2439 documented before 2018a and ICU and OpenJDK do not currently 2440 support them. A mechanism to export data to platforms lacking 2441 support for negative DST is planned to be developed before the 2442 change is reapplied. (Problems reported by Deborah Goldsmith and 2443 Stephen Colebourne.) 2444 2445 Changes to past timestamps 2446 2447 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 2448 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 2449 2450 Changes to build procedure 2451 2452 The build procedure now works around mawk 1.3.3's lack of support 2453 for character class expressions. (Problem reported by Ohyama.) 2454 2455 2456 Release 2018b - 2018-01-17 23:24:48 -0800 2457 2458 Briefly: 2459 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 2460 2461 Changes to build procedure 2462 2463 The distribution now contains the file 'pacificnew' again. 2464 This file was inadvertently omitted in the 2018a distribution. 2465 (Problem reported by Matias Fonzo.) 2466 2467 2468 Release 2018a - 2018-01-12 22:29:21 -0800 2469 2470 Briefly: 2471 So Tom and Prncipe switched from +00 to +01. 2472 Brazil's DST will now start on November's first Sunday. 2473 Ireland's standard time is now in the summer, not the winter. 2474 Use Debian-style installation locations, instead of 4.3BSD-style. 2475 New zic option -t. 2476 2477 Changes to past and future timestamps 2478 2479 So Tom and Prncipe switched from +00 to +01 on 2018-01-01 at 2480 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 2481 2482 Changes to future timestamps 2483 2484 Starting in 2018 southern Brazil will begin DST on November's 2485 first Sunday instead of October's third Sunday. (Thanks to 2486 Steffen Thorsen.) 2487 2488 Changes to past timestamps 2489 2490 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 2491 been corrected. The 'backzone' and 'zone.tab' files did not agree 2492 with the 'africa' and 'zone1970.tab' files. (Problem reported by 2493 Michael Deckers.) 2494 2495 The abbreviation invented for Bolivia Summer Time (1931-2) is now 2496 BST instead of BOST, to be more consistent with the convention 2497 used for Latvian Summer Time (1918-9) and for British Summer Time. 2498 2499 Changes to tm_isdst 2500 2501 Change Europe/Dublin so that it observes Irish Standard Time (UT 2502 +01) in summer and GMT (as negative daylight-saving) in winter, 2503 instead of observing standard time (GMT) in winter and Irish 2504 Summer Time (UT +01) in summer. This change does not affect UT 2505 offsets or abbreviations; it affects only whether timestamps are 2506 considered to be standard time or daylight-saving time, as 2507 expressed in the tm_isdst flag of C's struct tm type. 2508 (Discrepancy noted by Derick Rethans.) 2509 2510 Changes to build procedure 2511 2512 The default installation locations have been changed to mostly 2513 match Debian circa 2017, instead of being designed as an add-on to 2514 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 2515 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 2516 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 2517 locations more precisely. (This responds to suggestions from 2518 Brian Inglis and from Steve Summit.) 2519 2520 The default installation procedure no longer creates the 2521 backward-compatibility link US/Pacific-New, which causes 2522 confusion during user setup (e.g., see Debian bug 815200). 2523 Use 'make BACKWARD="backward pacificnew"' to create the link 2524 anyway, for now. Eventually we plan to remove the link entirely. 2525 2526 tzdata.zi now contains a version-number comment. 2527 (Suggested by Tom Lane.) 2528 2529 The Makefile now quotes values like BACKWARD more carefully when 2530 passing them to the shell. (Problem reported by Zefram.) 2531 2532 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 2533 that have snprintf and use pre-C99 compilers. (Problem reported 2534 by Jon Skeet.) 2535 2536 Changes to code 2537 2538 zic has a new option -t FILE that specifies the location of the 2539 file that determines local time when TZ is unset. The default for 2540 this location can be configured via the new TZDEFAULT makefile 2541 macro, which defaults to /etc/localtime. 2542 2543 Diagnostics and commentary now distinguish UT from UTC more 2544 carefully; see theory.html for more information about UT vs UTC. 2545 2546 zic has been ported to GCC 8's -Wstringop-truncation option. 2547 (Problem reported by Martin Sebor.) 2548 2549 Changes to documentation and commentary 2550 2551 The zic man page now documents the longstanding behavior that 2552 times and years can be out of the usual range, with negative times 2553 counting backwards from midnight and with year 0 preceding year 1. 2554 (Problem reported by Michael Deckers.) 2555 2556 The theory.html file now mentions the POSIX limit of six chars 2557 per abbreviation, and lists alphabetic abbreviations used. 2558 2559 The files tz-art.htm and tz-link.htm have been renamed to 2560 tz-art.html and tz-link.html, respectively, for consistency with 2561 other file names and to simplify web server configuration. 2562 2563 2564 Release 2017c - 2017-10-20 14:49:34 -0700 2565 2566 Briefly: 2567 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 2568 Fiji ends DST 2018-01-14, not 2018-01-21. 2569 Namibia switches from +01/+02 to +02 on 2018-04-01. 2570 Sudan switches from +03 to +02 on 2017-11-01. 2571 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 2572 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 2573 A new file tzdata.zi now holds a small text copy of all data. 2574 The zic input format has been regularized slightly. 2575 2576 Changes to future timestamps 2577 2578 Northern Cyprus has decided to resume EU rules starting 2579 2017-10-29, thus reinstituting winter time. 2580 2581 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 2582 predicted. (Thanks to Dominic Fok.) Adjust future predictions 2583 accordingly. 2584 2585 Namibia will switch from +01 with DST to +02 all year on 2586 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 2587 at 02:00. (Thanks to Steffen Thorsen.) 2588 2589 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 2590 Atyya and Yahia Abdalla.) South Sudan is not switching, so 2591 Africa/Juba is no longer a link to Africa/Khartoum. 2592 2593 Tonga has likely ended its experiment with DST, and will not 2594 adjust its clocks on 2017-11-05. Although Tonga has not announced 2595 whether it will continue to observe DST, the IATA is assuming that 2596 it will not. (Thanks to David Wade.) 2597 2598 Turks & Caicos will switch from -04 all year to -05 with US DST on 2599 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 2600 at 02:00. (Thanks to Steffen Thorsen.) 2601 2602 Changes to past timestamps 2603 2604 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 2605 (Thanks to Arthur David Olson.) 2606 2607 Detroit did not observe DST in 1967. 2608 2609 Use railway time for Asia/Kolkata before 1941, by switching to 2610 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 2611 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 2612 2613 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 2614 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 2615 2616 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 2617 American time in 1892, not 1879. (Thanks to Michael Deckers.) 2618 2619 Adjust the 1867 transition in Alaska to better reflect the 2620 historical record, by changing it to occur on 1867-10-18 at 15:30 2621 Sitka time rather than at the start of 1867-10-17 local time. 2622 Although strictly speaking this is accurate only for Sitka, 2623 the rest of Alaska's blanks need to be filled in somehow. 2624 2625 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 2626 (Thanks to Michael Deckers.) 2627 2628 Add 7 s to the UT offset in Asia/Yangon before 1920. 2629 2630 Changes to zone names 2631 2632 Remove Canada/East-Saskatchewan from the 'backward' file, as it 2633 exceeded the 14-character limit and was an unused misnomer anyway. 2634 2635 Changes to build procedure 2636 2637 To support applications that prefer to read time zone data in text 2638 form, two zic input files tzdata.zi and leapseconds are now 2639 installed by default. The commands 'zic tzdata.zi' and 'zic -L 2640 leapseconds tzdata.zi' can reproduce the tzdata binary files 2641 without and with leap seconds, respectively. To prevent these two 2642 new files from being installed, use 'make TZDATA_TEXT=', and to 2643 suppress leap seconds from the tzdata text installation, use 'make 2644 TZDATA_TEXT=tzdata.zi'. 2645 2646 'make BACKWARD=' now suppresses backward-compatibility names 2647 like 'US/Pacific' that are defined in the 'backward' and 2648 'pacificnew' files. 2649 2650 'make check' now works on systems that lack a UTF-8 locale, 2651 or that lack the nsgmls program. Set UTF8_LOCALE to configure 2652 the name of a UTF-8 locale, if you have one. 2653 2654 Y2K runtime checks are no longer enabled by default. Add 2655 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 2656 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 2657 to disable them. (New name suggested by Brian Inglis.) 2658 2659 The build procedure for zdump now works on AIX 7.1. 2660 (Problem reported by Kees Dekker.) 2661 2662 Changes to code 2663 2664 zic and the reference runtime now reject multiple leap seconds 2665 within 28 days of each other, or leap seconds before the Epoch. 2666 As a result, support for double leap seconds, which was 2667 obsolescent and undocumented, has been removed. Double leap 2668 seconds were an error in the C89 standard; they have never existed 2669 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 2670 noticing glitches in the code that uncovered this problem.) 2671 2672 zic now warns about use of the obsolescent and undocumented -y 2673 option, and about use of the obsolescent TYPE field of Rule lines. 2674 2675 zic now allows unambiguous abbreviations like "Sa" and "Su" for 2676 weekdays; formerly it rejected them due to a bug. Conversely, zic 2677 no longer considers non-prefixes to be abbreviations; for example, 2678 it no longer accepts "lF" as an abbreviation for "lastFriday". 2679 Also, zic warns about the undocumented usage with a "last-" 2680 prefix, e.g., "last-Fri". 2681 2682 Similarly, zic now accepts the unambiguous abbreviation "L" for 2683 "Link" in ordinary context and for "Leap" in leap-second context. 2684 Conversely, zic no longer accepts non-prefixes such as "La" as 2685 abbreviations for words like "Leap". 2686 2687 zic no longer accepts leap second lines in ordinary input, or 2688 ordinary lines in leap second input. Formerly, zic sometimes 2689 warned about this undocumented usage and handled it incorrectly. 2690 2691 The new macro HAVE_TZNAME governs whether the tzname external 2692 variable is exported, instead of USG_COMPAT. USG_COMPAT now 2693 governs only the external variables "timezone" and "daylight". 2694 This change is needed because the three variables are not in the 2695 same category: although POSIX requires tzname, it specifies the 2696 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 2697 if not defined, the code attempts to guess it from other macros. 2698 2699 localtime.c and difftime.c no longer require stdio.h, and .c files 2700 other than zic.c no longer require sys/wait.h. 2701 2702 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 2703 2704 Calculation of time_t extrema works around a bug in GCC 4.8.4 2705 (Reported by Stan Shebs and Joseph Myers.) 2706 2707 zic.c no longer mistranslates formats of line numbers in non-English 2708 locales. (Problem reported by Benno Schulenberg.) 2709 2710 Several minor changes have been made to the code to make it a 2711 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 2712 Dekker for reporting the problems.) 2713 2714 Changes to documentation and commentary 2715 2716 The two new files 'theory.html' and 'calendars' contain the 2717 contents of the removed file 'Theory'. The goal is to document 2718 tzdb theory more accessibly. 2719 2720 The zic man page now documents abbreviation rules. 2721 2722 tz-link.htm now covers how to apply tzdata changes to clients. 2723 (Thanks to Jorge Fbregas for the AIX link.) It also mentions MySQL. 2724 2725 The leap-seconds.list URL has been updated to something that is 2726 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 2727 2728 Release 2017b - 2017-03-17 07:30:38 -0700 2729 2730 Briefly: Haiti has resumed DST. 2731 2732 Changes to past and future timestamps 2733 2734 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 2735 2736 Changes to past timestamps 2737 2738 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 2739 2740 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 2741 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 2742 2743 Changes to code 2744 2745 The reference localtime implementation now falls back on the 2746 current US daylight-saving transition rules rather than the 2747 1987-2006 rules. This fallback occurs only when (1) the TZ 2748 environment variable has a value like "AST4ADT" that asks 2749 for daylight saving time but does not specify the rules, (2) there 2750 is no file by that name, and (3) the TZDEFRULES file cannot be 2751 loaded. (Thanks to Tom Lane.) 2752 2753 2754 Release 2017a - 2017-02-28 00:05:36 -0800 2755 2756 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 2757 discontinues DST. 2758 2759 Changes to future timestamps 2760 2761 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 2762 2763 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 2764 Its clocks diverge from America/Santiago starting 2017-05-13 at 2765 23:00, hiving off a new zone America/Punta_Arenas. Although the 2766 Chilean government says this change expires in May 2019, for now 2767 assume it's permanent. (Thanks to Juan Correa and Deborah 2768 Goldsmith.) This also affects Antarctica/Palmer. 2769 2770 Changes to past timestamps 2771 2772 Fix many entries for historical timestamps for Europe/Madrid 2773 before 1979, to agree with tables compiled by Pere Planesas of the 2774 National Astronomical Observatory of Spain. As a side effect, 2775 this changes some timestamps for Africa/Ceuta before 1929, which 2776 are probably guesswork anyway. (Thanks to Steve Allen and 2777 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 2778 correcting the 1901 transition.) 2779 2780 Ecuador observed DST from 1992-11-28 to 1993-02-05. 2781 (Thanks to Alois Treindl.) 2782 2783 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 2784 (Thanks to Stepan Golosunov.) 2785 2786 Changes to past and future time zone abbreviations 2787 2788 Switch to numeric time zone abbreviations for South America, as 2789 part of the ongoing project of removing invented abbreviations. 2790 This avoids the need to invent an abbreviation for the new Chilean 2791 new zone. Similarly, switch from invented to numeric time zone 2792 abbreviations for Afghanistan, American Samoa, the Azores, 2793 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 2794 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 2795 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 2796 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 2797 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 2798 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 2799 Papua New Guinea, the Philippines, Pitcairn, Qatar, Runion, St 2800 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 2801 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 2802 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 2803 for half-hour daylight saving time in Belize before 1944 and in 2804 the Dominican Republic before 1975; and for Canary Islands before 2805 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 2806 Indian Summer Time before 1942, for Indonesia before around 1964, 2807 for Kenya before 1960, for Liberia before 1973, for Madeira before 2808 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 2809 Pakistan before 1971, for Western Sahara before 1977, and for 2810 Zaporozhye in 1880-1924. 2811 2812 For Alaska time from 1900 through 1967, instead of "CAT" use the 2813 abbreviation "AST", the abbreviation commonly used at the time 2814 (Atlantic Standard Time had not been standardized yet). Use "AWT" 2815 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 2816 2817 Use "CST" and "CDT" instead of invented abbreviations for Macau 2818 before 1999 and Taiwan before 1938, and use "JST" instead of the 2819 invented abbreviation "JCST" for Japan and Korea before 1938. 2820 2821 Change to database entry category 2822 2823 Move the Pacific/Johnston link from 'australasia' to 'backward', 2824 since Johnston is now uninhabited. 2825 2826 Changes to code 2827 2828 zic no longer mishandles some transitions in January 2038 when it 2829 attempts to work around Qt bug 53071. This fixes a bug affecting 2830 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 2831 now contains a workaround, useful when loading a file generated by 2832 a buggy zic. (Problem and localtime.c fix reported by Bradley 2833 White.) 2834 2835 zdump -i now outputs non-hour numeric time zone abbreviations 2836 without a colon, e.g., "+0530" rather than "+05:30". This agrees 2837 with zic %z and with common practice, and simplifies auditing of 2838 zdump output. 2839 2840 zdump is now buildable again with -DUSE_LTZ=0. 2841 (Problem reported by Joseph Myers.) 2842 2843 zdump.c now always includes private.h, to avoid code duplication 2844 with private.h. (Problem reported by Kees Dekker.) 2845 2846 localtime.c no longer mishandles early or late timestamps 2847 when TZ is set to a POSIX-style string that specifies DST. 2848 (Problem reported by Kees Dekker.) 2849 2850 date and strftime now cause %z to generate "-0000" instead of 2851 "+0000" when the UT offset is zero and the time zone abbreviation 2852 begins with "-". 2853 2854 Changes to documentation and commentary 2855 2856 The 'Theory' file now better documents choice of historical time 2857 zone abbreviations. (Problems reported by Michael Deckers.) 2858 2859 tz-link.htm now covers leap smearing, which is popular in clouds. 2860 2861 2862 Release 2016j - 2016-11-22 23:17:13 -0800 2863 2864 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 2865 2866 Changes to future timestamps 2867 2868 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 2869 This hives off a new zone Europe/Saratov from Europe/Volgograd. 2870 (Thanks to Yuri Konotopov and Stepan Golosunov.) 2871 2872 Changes to past timestamps 2873 2874 The new zone Asia/Atyrau for Atyra Region, Kazakhstan, is like 2875 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 2876 1999, not fall 1994. (Thanks to Stepan Golosunov.) 2877 2878 Changes to past time zone abbreviations 2879 2880 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 2881 summer time before 1948. The old use of "EET" was a typo. 2882 2883 Changes to code 2884 2885 zic no longer mishandles file systems that lack hard links, fixing 2886 bugs introduced in 2016g. (Problems reported by Tom Lane.) 2887 Also, when the destination already contains symbolic links, zic 2888 should now work better on systems where the 'link' system call 2889 does not follow symbolic links. 2890 2891 Changes to documentation and commentary 2892 2893 tz-link.htm now documents the relationship between release version 2894 numbers and development-repository commit tags. (Suggested by 2895 Paul Koning.) 2896 2897 The 'Theory' file now documents UT. 2898 2899 iso3166.tab now accents "Curaao", and commentary now mentions 2900 the names "Cabo Verde" and "Czechia". (Thanks to Ji Boh.) 2901 2902 2903 Release 2016i - 2016-11-01 23:19:52 -0700 2904 2905 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 2906 reintroduces DST on 2016-11-06. 2907 2908 Changes to future timestamps 2909 2910 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 2911 2017-01-15 at 03:00. Assume future observances in Tonga will be 2912 from the first Sunday in November through the third Sunday in 2913 January, like Fiji. (Thanks to Pulu Anau.) Switch to numeric 2914 time zone abbreviations for this zone. 2915 2916 Changes to past and future timestamps 2917 2918 Northern Cyprus is now +03 year round, causing a split in Cyprus 2919 time zones starting 2016-10-30 at 04:00. This creates a zone 2920 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 2921 2922 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 2923 (Thanks to Steffen Thorsen.) 2924 2925 Changes to past timestamps 2926 2927 Several corrections were made for pre-1975 timestamps in Italy. 2928 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 2929 Europe/Vatican. 2930 2931 First, the 1893-11-01 00:00 transition in Italy used the new UT 2932 offset (+01), not the old (+00:49:56). (Thanks to Michael 2933 Deckers.) 2934 2935 Second, rules for daylight saving in Italy were changed to agree 2936 with Italy's National Institute of Metrological Research (INRiM) 2937 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 2938 Inglis, and Michael Deckers): 2939 2940 The 1916-06-03 transition was at 24:00, not 00:00. 2941 2942 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 2943 00:00, not 01:00. 2944 2945 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 2946 01:00. 2947 2948 The 1944-09-17 transition was at 03:00, not 01:00. This 2949 particular change is taken from Italian law as INRiM's table, 2950 (which says 02:00) appears to have a typo here. Also, keep the 2951 1944-04-03 transition for Europe/Rome, as Rome was controlled by 2952 Germany then. 2953 2954 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 2955 not 00:00. 2956 2957 Changes to code 2958 2959 The code should now be buildable on AmigaOS merely by setting the 2960 appropriate Makefile variables. (From a patch by Carsten Larsen.) 2961 2962 2963 Release 2016h - 2016-10-19 23:17:57 -0700 2964 2965 Changes to future timestamps 2966 2967 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 2968 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 2969 future fall transitions will be on the last Saturday of October 2970 at 01:00, which is consistent with predicted spring transitions 2971 on the last Saturday of March. (Thanks to Tim Parenti.) 2972 2973 Changes to past timestamps 2974 2975 In Turkey, transitions in 1986-1990 were at 01:00 standard time 2976 not at 02:00, and the spring 1994 transition was on March 20, not 2977 March 27. (Thanks to Kvan Yazan.) 2978 2979 Changes to past and future time zone abbreviations 2980 2981 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 2982 instead of alphabetic ones like "IST" and "LKT". Various 2983 English-language sources use "IST", "LKT" and "SLST", with no 2984 working consensus. (Usage of "SLST" mentioned by Sadika 2985 Sumanapala.) 2986 2987 Changes to code 2988 2989 zic no longer mishandles relativizing file names when creating 2990 symbolic links like /etc/localtime, when these symbolic links 2991 are outside the usual directory hierarchy. This fixes a bug 2992 introduced in 2016g. (Problem reported by Andreas Stieger.) 2993 2994 Changes to build procedure 2995 2996 New rules 'traditional_tarballs' and 'traditional_signatures' for 2997 building just the traditional-format distribution. (Requested by 2998 Deborah Goldsmith.) 2999 3000 The file 'version' is now put into the tzdata tarball too. 3001 (Requested by Howard Hinnant.) 3002 3003 Changes to documentation and commentary 3004 3005 The 'Theory' file now has a section on interface stability. 3006 (Requested by Paul Koning.) It also mentions features like 3007 tm_zone and localtime_rz that have long been supported by the 3008 reference code. 3009 3010 tz-link.htm has improved coverage of time zone boundaries suitable 3011 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 3012 Johnson.) 3013 3014 The US commentary now mentions Allen and the "day of two noons". 3015 3016 The Fiji commentary mentions the government's 2016-10-03 press 3017 release. (Thanks to Raymond Kumar.) 3018 3019 3020 Release 2016g - 2016-09-13 08:56:38 -0700 3021 3022 Changes to future timestamps 3023 3024 Turkey switched from EET/EEST (+02/+03) to permanent +03, 3025 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 3026 than an invented abbreviation for the new time. 3027 3028 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 3029 (Thanks to Tim Parenti.) 3030 3031 Changes to past timestamps 3032 3033 For America/Los_Angeles, spring-forward transition times have been 3034 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 3035 1950-1966. 3036 3037 For zones using Soviet time on 1919-07-01, transitions to UT-based 3038 time were at 00:00 UT, not at 02:00 local time. The affected 3039 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 3040 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 3041 3042 Changes to past and future time zone abbreviations 3043 3044 The Factory zone now uses the time zone abbreviation -00 instead 3045 of a long English-language string, as -00 is now the normal way to 3046 represent an undefined time zone. 3047 3048 Several zones in Antarctica and the former Soviet Union, along 3049 with zones intended for ships at sea that cannot use POSIX TZ 3050 strings, now use numeric time zone abbreviations instead of 3051 invented or obsolete alphanumeric abbreviations. The affected 3052 zones are Antarctica/Casey, Antarctica/Davis, 3053 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 3054 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 3055 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 3056 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 3057 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 3058 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 3059 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 3060 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 3061 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 3062 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 3063 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 3064 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 3065 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 3066 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 3067 was replaced by +05, whereas MSK and MSD were kept as they are not 3068 our invention and are widely used. 3069 3070 Changes to zone names 3071 3072 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 3073 (Thanks to David Massoud.) 3074 3075 Changes to code 3076 3077 zic no longer generates binary files containing POSIX TZ-like 3078 strings that disagree with the local time type after the last 3079 explicit transition in the data. This fixes a bug with 3080 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 3081 on the reference platform. (Thanks to Alexander Belopolsky for 3082 reporting the bug and suggesting a way forward.) 3083 3084 If the installed localtime and/or posixrules files are symbolic 3085 links, zic now keeps them symbolic links when updating them, for 3086 compatibility with platforms like OpenSUSE where other programs 3087 configure these files as symlinks. 3088 3089 zic now avoids hard linking to symbolic links, avoids some 3090 unnecessary mkdir and stat system calls, and uses shorter file 3091 names internally. 3092 3093 zdump has a new -i option to generate transitions in a 3094 smaller but still human-readable format. This option is 3095 experimental, and the output format may change in future versions. 3096 (Thanks to Jon Skeet for suggesting that an option was needed, 3097 and thanks to Tim Parenti and Chris Rovick for further comments.) 3098 3099 Changes to build procedure 3100 3101 An experimental distribution format is available, in addition 3102 to the traditional format which will continue to be distributed. 3103 The new format is a tarball tzdb-VERSION.tar.lz with signature 3104 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 3105 tzdb-VERSION containing the code and data of the traditional 3106 two-tarball format, along with extra data that may be useful. 3107 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 3108 for comments about the experimental format.) 3109 3110 The release version number is now more accurate in the usual case 3111 where releases are built from a Git repository. For example, if 3112 23 commits and some working-file changes have been made since 3113 release 2016g, the version number is now something like 3114 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 3115 Tagged releases use the same version number format as before, 3116 e.g., '2016g'. To support the more accurate version number, its 3117 specification has moved from a line in the Makefile to a new 3118 source file 'version'. 3119 3120 The experimental distribution contains a file to2050.tzs that 3121 contains what should be the output of 'zdump -i -c 2050' on 3122 primary zones. If this file is available, 'make check' now checks 3123 that zdump generates this output. 3124 3125 'make check_web' now works on Fedora-like distributions. 3126 3127 Changes to documentation and commentary 3128 3129 tzfile.5 now documents the new restriction on POSIX TZ-like 3130 strings that is now implemented by zic. 3131 3132 Comments now cite URLs for some 1917-1921 Russian DST decrees. 3133 (Thanks to Alexander Belopolsky.) 3134 3135 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 3136 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 3137 description of Java 8 has been brought up to date (thanks to 3138 Stephen Colebourne). Its description of local time on Mars has 3139 been updated to match current practice, and URLs have been updated 3140 and some obsolete ones removed. 3141 3142 3143 Release 2016f - 2016-07-05 16:26:51 +0200 3144 3145 Changes affecting future timestamps 3146 3147 The Egyptian government changed its mind on short notice, and 3148 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 3149 (Thanks to Mina Samuel.) 3150 3151 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 3152 (Thanks to Stepan Golosunov.) 3153 3154 Changes to past and future timestamps 3155 3156 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 3157 abbreviations instead of invented ones. 3158 3159 Changes affecting past timestamps 3160 3161 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 3162 (Thanks to Stepan Golosunov.) 3163 3164 3165 Release 2016e - 2016-06-14 08:46:16 -0700 3166 3167 Changes affecting future timestamps 3168 3169 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 3170 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 3171 For future years, guess April's last Thursday to October's last 3172 Thursday except for Ramadan. 3173 3174 Changes affecting past timestamps 3175 3176 Locations while uninhabited now use '-00', not 'zzz', as a 3177 placeholder time zone abbreviation. This is inspired by Internet 3178 RFC 3339 and is more consistent with numeric time zone 3179 abbreviations already used elsewhere. The change affects several 3180 arctic and antarctic locations, e.g., America/Cambridge_Bay before 3181 1920 and Antarctica/Troll before 2005. 3182 3183 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 3184 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 3185 3186 Changes to code 3187 3188 zic now outputs a dummy transition at time 2**31 - 1 in zones 3189 whose POSIX-style TZ strings contain a '<'. This mostly works 3190 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 3191 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 3192 3193 Changes affecting documentation and commentary 3194 3195 tz-link.htm says why governments should give plenty of notice for 3196 time zone or DST changes, and refers to Matt Johnson's blog post. 3197 3198 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 3199 3200 3201 Release 2016d - 2016-04-17 22:50:29 -0700 3202 3203 Changes affecting future timestamps 3204 3205 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 3206 (Thanks to Alexander Krivenyshev for the heads-up.) 3207 3208 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 3209 (Thanks to Alexander Krivenyshev and Matt Johnson.) 3210 3211 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 3212 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 3213 at 02:00. (Thanks to Stepan Golosunov.) 3214 3215 Changes affecting past timestamps 3216 3217 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 3218 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 3219 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 3220 the same change. (Thanks to Stepan Golosunov.) 3221 3222 Russia and nearby locations had daylight-saving transitions on 3223 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 3224 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 3225 Golosunov.) 3226 3227 Many corrections to historical time in Kazakhstan from 1991 3228 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 3229 invented time zone abbreviations with numeric abbreviations. 3230 3231 Changes to commentary 3232 3233 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 3234 3235 3236 Release 2016c - 2016-03-23 00:51:27 -0700 3237 3238 Changes affecting future timestamps 3239 3240 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 3241 3242 Chile reverts from permanent to seasonal DST. (Thanks to Juan 3243 Correa for the heads-up, and to Tim Parenti for corrections.) 3244 Guess that future transitions are August's and May's second 3245 Saturdays at 24:00 mainland time. Also, call the period from 3246 2014-09-07 through 2016-05-14 daylight saving time instead of 3247 standard time, as that seems more appropriate now. 3248 3249 Changes affecting past timestamps 3250 3251 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 3252 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 3253 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 3254 (Thanks to Stepan Golosunov.) 3255 3256 Changes to commentary 3257 3258 Several updates and URLs for historical and proposed Russian changes. 3259 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 3260 3261 3262 Release 2016b - 2016-03-12 17:30:14 -0800 3263 3264 Compatibility note 3265 3266 Starting with release 2016b, some data entries cause zic implementations 3267 derived from tz releases 2005j through 2015e to issue warnings like 3268 "time zone abbreviation differs from POSIX standard (+03)". 3269 These warnings should not otherwise affect zic's output and can safely be 3270 ignored on today's platforms, as the warnings refer to a restriction in 3271 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 3272 warnings is to upgrade to zic derived from tz releases 2015f and later. 3273 3274 Changes affecting future timestamps 3275 3276 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 3277 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 3278 2016-03-27 at 02:00 local time. They need distinct zones since their 3279 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 3280 Altai Republic, Russia, which will switch from +06 to +07 on the same date 3281 and local time. The Astrakhan change is already official; the others have 3282 passed the first reading in the State Duma and are extremely likely. 3283 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 3284 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 3285 and Stepan Golosunov for followup.) 3286 3287 As a trial of a new system that needs less information to be made up, 3288 the new zones use numeric time zone abbreviations like "+04" 3289 instead of invented abbreviations like "ASTT". 3290 3291 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 3292 Steffen Thorsen.) 3293 3294 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 3295 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 3296 Saturday at 01:00, not March's last Friday at 24:00. 3297 3298 Changes affecting past timestamps 3299 3300 Europe/Chisinau observed DST during 1990, and switched from +04 to 3301 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 3302 (Thanks to Stepan Golosunov.) 3303 3304 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 3305 KUYT/KUYST. (Thanks to Stepan Golosunov.) 3306 3307 Changes to code 3308 3309 tzselect's diagnostics and checking, and checktab.awk's checking, 3310 have been improved. (Thanks to J William Piggott.) 3311 3312 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 3313 3314 tzselect now tests Julian-date TZ settings more accurately. 3315 (Thanks to J William Piggott.) 3316 3317 Changes to commentary 3318 3319 Comments in zone tables have been improved. (Thanks to J William Piggott.) 3320 3321 tzselect again limits its menu comments so that menus fit on a 3322 2480 alphanumeric display. 3323 3324 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 3325 3326 In the Theory file, the description of possible time zone abbreviations in 3327 tzdata has been cleaned up, as the old description was unclear and 3328 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 3329 3330 3331 Release 2016a - 2016-01-26 23:28:02 -0800 3332 3333 Changes affecting future timestamps 3334 3335 America/Cayman will not observe daylight saving this year after all. 3336 Revert our guess that it would. (Thanks to Matt Johnson.) 3337 3338 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 3339 (Thanks to Alexander Krivenyshev.) 3340 3341 Asia/Tehran now has DST predictions for the year 2038 and later, 3342 to be March 21 00:00 to September 21 00:00. This is likely better 3343 than predicting no DST, albeit off by a day every now and then. 3344 3345 Changes affecting past and future timestamps 3346 3347 America/Metlakatla switched from PST all year to AKST/AKDT on 3348 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 3349 3350 America/Santa_Isabel has been removed, and replaced with a 3351 backward compatibility link to America/Tijuana. Its contents were 3352 apparently based on a misreading of Mexican legislation. 3353 3354 Changes affecting past timestamps 3355 3356 Asia/Karachi's two transition times in 2002 were off by a minute. 3357 (Thanks to Matt Johnson.) 3358 3359 Changes affecting build procedure 3360 3361 An installer can now combine leap seconds with use of the backzone file, 3362 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 3363 The old 'make posix_packrat' rule is now marked as obsolescent. 3364 (Thanks to Ian Abbott for an initial implementation.) 3365 3366 Changes affecting documentation and commentary 3367 3368 A new file LICENSE makes it easier to see that the code and data 3369 are mostly public-domain. (Thanks to James Knight.) The three 3370 non-public-domain files now use the current (3-clause) BSD license 3371 instead of older versions of that license. 3372 3373 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 3374 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 3375 on editing tz source files (with a mention of Sublime zoneinfo, 3376 thanks to Gilmore Davidson). 3377 3378 The Theory and asia files now mention the 2015 book "The Global 3379 Transformation of Time, 1870-1950", and cite a couple of reviews. 3380 3381 The America/Chicago entry now documents the informal use of US 3382 central time in Fort Pierre, South Dakota. (Thanks to Rick 3383 McDermid, Matt Johnson, and Steve Jones.) 3384 3385 3386 Release 2015g - 2015-10-01 00:39:51 -0700 3387 3388 Changes affecting future timestamps 3389 3390 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 3391 (Thanks to Fatih.) 3392 3393 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 3394 (Thanks to Alexander Krivenyshev.) 3395 3396 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 3397 (Thanks to Ken Rylander.) 3398 3399 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 3400 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 3401 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 3402 3403 Changes affecting past timestamps 3404 3405 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 3406 3407 Changes affecting code 3408 3409 localtime no longer mishandles America/Anchorage after 2037. 3410 (Thanks to Bradley White for reporting the bug.) 3411 3412 On hosts with signed 32-bit time_t, localtime no longer mishandles 3413 Pacific/Fiji after 2038-01-16 14:00 UTC. 3414 3415 The localtime module allows the variables 'timezone', 'daylight', 3416 and 'altzone' to be in common storage shared with other modules, 3417 and declares them in case the system <time.h> does not. 3418 (Problems reported by Kees Dekker.) 3419 3420 On platforms with tm_zone, strftime.c now assumes it is not NULL. 3421 This simplifies the code and is consistent with zdump.c. 3422 (Problem reported by Christos Zoulas.) 3423 3424 Changes affecting documentation 3425 3426 The tzfile man page now documents that transition times denote the 3427 starts (not the ends) of the corresponding time periods. 3428 (Ambiguity reported by Bill Seymour.) 3429 3430 3431 Release 2015f - 2015-08-10 18:06:56 -0700 3432 3433 Changes affecting future timestamps 3434 3435 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 3436 The abbreviation remains "KST". (Thanks to Robert Elz.) 3437 3438 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 3439 and Pablo Camargo.) 3440 3441 Changes affecting past and future timestamps 3442 3443 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 3444 (Thanks to Roman Tudos.) 3445 3446 Changes affecting data format and code 3447 3448 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 3449 field of a Rule line should now be '-'; the old values 'even', 3450 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 3451 Although the implementation has not changed, these features do not 3452 work in the default installation, they are not used in the data, 3453 and they are now considered obsolescent. 3454 3455 zic now checks that two rules don't take effect at the same time. 3456 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 3457 simultaneity are now documented. 3458 3459 The two characters '%z' in a zone format now stand for the UT 3460 offset, e.g., '-07' for seven hours behind UT and '+0530' for 3461 five hours and thirty minutes ahead. This better supports time 3462 zone abbreviations conforming to POSIX.1-2001 and later. 3463 3464 Changes affecting installed data files 3465 3466 Comments for America/Halifax and America/Glace_Bay have been improved. 3467 (Thanks to Brian Inglis.) 3468 3469 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 3470 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 3471 installed data files for Europe/Simferopol and Europe/Tallinn. 3472 It does not affect timestamps. (Thanks to Howard Hinnant.) 3473 3474 Changes affecting code 3475 3476 zdump and zic no longer warn about valid time zone abbreviations 3477 like '-05'. 3478 3479 Some Visual Studio 2013 warnings have been suppressed. 3480 (Thanks to Kees Dekker.) 3481 3482 'date' no longer sets the time of day and its -a, -d, -n and -t 3483 options have been removed. Long obsolescent, the implementation 3484 of these features had porting problems. Builders no longer need 3485 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 3486 (Thanks to Kees Dekker for pointing out the problem.) 3487 3488 Changes affecting documentation 3489 3490 The Theory file mentions naming issues earlier, as these seem to be 3491 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 3492 3493 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 3494 3495 Mention that Herbert Samuel introduced the term "Summer Time". 3496 3497 3498 Release 2015e - 2015-06-13 10:56:02 -0700 3499 3500 Changes affecting future timestamps 3501 3502 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 3503 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 3504 3505 Assume Cayman Islands will observe DST starting next year, using US rules. 3506 Although it isn't guaranteed, it is the most likely. 3507 3508 Changes affecting data format 3509 3510 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 3511 spell the names of land Islands, Cte d'Ivoire, and Runion. 3512 3513 Changes affecting code 3514 3515 When displaying data, tzselect converts it to the current locale's 3516 encoding if the iconv command works. (Problem reported by random832.) 3517 3518 tzselect no longer mishandles Dominica, fixing a bug introduced 3519 in Release 2014f. (Problem reported by Owen Leibman.) 3520 3521 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 3522 This fixes a bug introduced in Release 2014f. 3523 (Problem reported by Leonardo Chiquitto.) 3524 3525 3526 Release 2015d - 2015-04-24 08:09:46 -0700 3527 3528 Changes affecting future timestamps 3529 3530 Egypt will not observe DST in 2015 and will consider canceling it 3531 permanently. For now, assume no DST indefinitely. 3532 (Thanks to Ahmed Nazmy and Tim Parenti.) 3533 3534 Changes affecting past timestamps 3535 3536 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 3537 1966-07-01. Also, Yukon's time zone history is documented better. 3538 (Thanks to Brian Inglis and Dennis Ferguson.) 3539 3540 Change affecting past and future time zone abbreviations 3541 3542 The abbreviations for Hawaii-Aleutian standard and daylight times 3543 have been changed from HAST/HADT to HST/HDT, as per US Government 3544 Printing Office style. This affects only America/Adak since 1983, 3545 as America/Honolulu was already using the new style. 3546 3547 Changes affecting code 3548 3549 zic has some minor performance improvements. 3550 3551 3552 Release 2015c - 2015-04-11 08:55:55 -0700 3553 3554 Changes affecting future timestamps 3555 3556 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 3557 not 00:00 on April's last Friday. 2015's transition will therefore be on 3558 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 3559 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 3560 3561 Changes affecting past timestamps 3562 3563 The following changes affect some pre-1991 Chile-related timestamps 3564 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 3565 3566 The 1910 transition was January 10, not January 1. 3567 3568 The 1918 transition was September 10, not September 1. 3569 3570 The UT -04 time observed from 1932 to 1942 is now considered to 3571 be standard time, not year-round DST. 3572 3573 Santiago observed DST (UT -03) from 1946-07-15 through 3574 1946-08-31, then reverted to standard time, then switched to -05 3575 on 1947-04-01. 3576 3577 Assume transitions before 1968 were at 00:00, since we have no data 3578 saying otherwise. 3579 3580 The spring 1988 transition was 1988-10-09, not 1988-10-02. 3581 The fall 1990 transition was 1990-03-11, not 1990-03-18. 3582 3583 Assume no UT offset change for Pacific/Easter on 1890-01-01, 3584 and omit all transitions on Pacific/Easter from 1942 through 1946 3585 since we have no data suggesting that they existed. 3586 3587 One more zone has been turned into a link, as it differed 3588 from an existing zone only for older timestamps. As usual, 3589 this change affects UT offsets in pre-1970 timestamps only. 3590 The zone's old contents have been moved to the 'backzone' file. 3591 The affected zone is America/Montreal. 3592 3593 Changes affecting commentary 3594 3595 Mention the TZUpdater tool. 3596 3597 Mention "The Time Now". (Thanks to Brandon Ramsey.) 3598 3599 3600 Release 2015b - 2015-03-19 23:28:11 -0700 3601 3602 Changes affecting future timestamps 3603 3604 Mongolia will start observing DST again this year, from the last 3605 Saturday in March at 02:00 to the last Saturday in September at 00:00. 3606 (Thanks to Ganbold Tsagaankhuu.) 3607 3608 Palestine will start DST on March 28, not March 27. Also, 3609 correct the fall 2014 transition from September 26 to October 24. 3610 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 3611 3612 Changes affecting past timestamps 3613 3614 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 3615 regression. (Thanks to Stuart Bishop for reporting the problem.) 3616 3617 Some more zones have been turned into links, when they differed 3618 from existing zones only for older timestamps. As usual, 3619 these changes affect UT offsets in pre-1970 timestamps only. 3620 Their old contents have been moved to the 'backzone' file. 3621 The affected zones are: America/Antigua, America/Cayman, 3622 Pacific/Midway, and Pacific/Saipan. 3623 3624 Changes affecting time zone abbreviations 3625 3626 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 3627 (Thanks to Hank W.) 3628 3629 Changes affecting code 3630 3631 Fix integer overflow bug in reference 'mktime' implementation. 3632 (Problem reported by Jrg Richter.) 3633 3634 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 3635 to be used in the same executable as standard-library time_t functions. 3636 (Problems reported by Bradley White.) 3637 3638 Changes affecting commentary 3639 3640 Cite the recent Mexican decree changing Quintana Roo's time zone. 3641 (Thanks to Carlos Ral Perasso.) 3642 3643 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 3644 3645 Update info about Mars time. 3646 3647 3648 Release 2015a - 2015-01-29 22:35:20 -0800 3649 3650 Changes affecting future timestamps 3651 3652 The Mexican state of Quintana Roo, represented by America/Cancun, 3653 will shift from Central Time with DST to Eastern Time without DST 3654 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 3655 3656 Chile will not change clocks in April or thereafter; its new standard time 3657 will be its old daylight saving time. This affects America/Santiago, 3658 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 3659 3660 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 3661 (Thanks to Tim Parenti.) 3662 3663 Changes affecting past timestamps 3664 3665 Iceland observed DST in 1919 and 1921, and its 1939 fallback 3666 transition was Oct. 29, not Nov. 29. Remove incorrect data from 3667 Shanks about time in Iceland between 1837 and 1908. 3668 3669 Some more zones have been turned into links, when they differed 3670 from existing zones only for older timestamps. As usual, 3671 these changes affect UT offsets in pre-1970 timestamps only. 3672 Their old contents have been moved to the 'backzone' file. 3673 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 3674 and Asia/Muscat. 3675 3676 Changes affecting code 3677 3678 tzalloc now scrubs time zone abbreviations compatibly with the way 3679 that tzset always has, by replacing invalid bytes with '_' and by 3680 shortening too-long abbreviations. 3681 3682 tzselect ports to POSIX awk implementations, no longer mishandles 3683 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 3684 settings to the user. (Thanks to Stefan Kuhn.) 3685 3686 Changes affecting build procedure 3687 3688 'make check' now checks for links to links in the data. 3689 One such link (for Africa/Asmera) has been fixed. 3690 (Thanks to Stephen Colebourne for pointing out the problem.) 3691 3692 Changes affecting commentary 3693 3694 The leapseconds file commentary now mentions the expiration date. 3695 (Problem reported by Martin Burnicki.) 3696 3697 Update Mexican Library of Congress URL. 3698 3699 3700 Release 2014j - 2014-11-10 17:37:11 -0800 3701 3702 Changes affecting current and future timestamps 3703 3704 Turks & Caicos' switch from US eastern time to UT -04 year-round 3705 did not occur on 2014-11-02 at 02:00. It's currently scheduled 3706 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 3707 3708 Changes affecting past timestamps 3709 3710 Many pre-1989 timestamps have been corrected for Asia/Seoul and 3711 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 3712 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 3713 longer guess that Pyongyang mimicked Seoul time after World War II, 3714 as this is politically implausible. 3715 3716 Some more zones have been turned into links, when they differed 3717 from existing zones only for older timestamps. As usual, 3718 these changes affect UT offsets in pre-1970 timestamps only. 3719 Their old contents have been moved to the 'backzone' file. 3720 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 3721 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 3722 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 3723 Indian/Mayotte. 3724 3725 Changes affecting commentary 3726 3727 The commentary is less enthusiastic about Shanks as a source, 3728 and is more careful to distinguish UT from UTC. 3729 3730 3731 Release 2014i - 2014-10-21 22:04:57 -0700 3732 3733 Changes affecting future timestamps 3734 3735 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 3736 (Thanks to Ken Rylander for the heads-up.) Guess that future 3737 years will use a similar pattern. 3738 3739 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 3740 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 3741 (Thanks to Kiley Walbom for the heads-up.) 3742 3743 Changes affecting time zone abbreviations 3744 3745 Since Belarus is not changing its clocks even though Moscow is, 3746 the time zone abbreviation in Europe/Minsk is changing from FET 3747 to its more traditional value MSK on 2014-10-26 at 01:00. 3748 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 3749 3750 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 3751 Indochina, to distinguish it better from ICT (+07). 3752 3753 Changes affecting past timestamps 3754 3755 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 3756 (thanks to Trn Ngc Qun for an indirect pointer to Trn Tin Bnh's 3757 authoritative book). Asia/Ho_Chi_Minh has been added to 3758 zone1970.tab, to give tzselect users in Vietnam two choices, 3759 since north and south Vietnam disagreed after our 1970 cutoff. 3760 3761 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 3762 they differed from existing zones only for older timestamps. As 3763 usual, these changes affect pre-1970 timestamps only. Their old 3764 contents have been moved to the 'backzone' file. 3765 3766 Changes affecting code 3767 3768 The time-related library functions now set errno on failure, and 3769 some crashes in the new tzalloc-related library functions have 3770 been fixed. (Thanks to Christos Zoulas for reporting most of 3771 these problems and for suggesting fixes.) 3772 3773 If USG_COMPAT is defined and the requested timestamp is standard time, 3774 the tz library's localtime and mktime functions now set the extern 3775 variable timezone to a value appropriate for that timestamp; and 3776 similarly for ALTZONE, daylight saving time, and the altzone variable. 3777 This change is a companion to the tzname change in 2014h, and is 3778 designed to make timezone and altzone more compatible with tzname. 3779 3780 The tz library's functions now set errno to EOVERFLOW if they fail 3781 because the result cannot be represented. ctime and ctime_r now 3782 return NULL and set errno when a timestamp is out of range, rather 3783 than having undefined behavior. 3784 3785 Some bugs associated with the new 2014g functions have been fixed. 3786 This includes a bug that largely incapacitated the new functions 3787 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 3788 It also includes some uses of uninitialized variables after tzalloc. 3789 The new code uses the standard type 'ssize_t', which the Makefile 3790 now gives porting advice about. 3791 3792 Changes affecting commentary 3793 3794 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 3795 3796 3797 Release 2014h - 2014-09-25 18:59:03 -0700 3798 3799 Changes affecting past timestamps 3800 3801 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 3802 3803 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 3804 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 3805 3806 Some more zones have been turned into links, when they differed 3807 from existing zones only for older timestamps. As usual, 3808 these changes affect UT offsets in pre-1970 timestamps only. 3809 Their old contents have been moved to the 'backzone' file. 3810 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 3811 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 3812 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 3813 3814 Changes affecting code 3815 3816 zdump -V and -v now output gmtoff= values on all platforms, 3817 not merely on platforms defining TM_GMTOFF. 3818 3819 The tz library's localtime and mktime functions now set tzname to a value 3820 appropriate for the requested timestamp, and zdump now uses this 3821 on platforms not defining TM_ZONE, fixing a 2014g regression. 3822 (Thanks to Tim Parenti for reporting the problem.) 3823 3824 The tz library no longer sets tzname if localtime or mktime fails. 3825 3826 zdump -c no longer mishandles transitions near year boundaries. 3827 (Thanks to Tim Parenti for reporting the problem.) 3828 3829 An access to uninitialized data has been fixed. 3830 (Thanks to Jrg Richter for reporting the problem.) 3831 3832 When THREAD_SAFE is defined, the code ports to the C11 memory model. 3833 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 3834 and two threads race to initialize data used by gmtime-like functions. 3835 (Thanks to Andy Heninger for reporting the problems.) 3836 3837 Changes affecting build procedure 3838 3839 'make check' now checks better for properly sorted data. 3840 3841 Changes affecting documentation and commentary 3842 3843 zdump's gmtoff=N output is now documented, and its isdst=D output 3844 is now documented to possibly output D values other than 0 or 1. 3845 3846 zdump -c's treatment of years is now documented to use the 3847 Gregorian calendar and Universal Time without leap seconds, 3848 and its behavior at cutoff boundaries is now documented better. 3849 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 3850 3851 Programs are now documented to use the proleptic Gregorian calendar. 3852 (Thanks to Alan Barrett for the suggestion.) 3853 3854 Fractional-second GMT offsets have been documented for civil time 3855 in 19th-century Chennai, Jakarta, and New York. 3856 3857 3858 Release 2014g - 2014-08-28 12:31:23 -0700 3859 3860 Changes affecting future timestamps 3861 3862 Turks & Caicos is switching from US eastern time to UT -04 3863 year-round, modeled as a switch on 2014-11-02 at 02:00. 3864 [As noted in 2014j, this switch was later delayed.] 3865 3866 Changes affecting past timestamps 3867 3868 Time in Russia or the USSR before 1926 or so has been corrected by 3869 a few seconds in the following zones: Asia/Irkutsk, 3870 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 3871 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 3872 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 3873 Vladimir Karpinsky.) 3874 3875 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 3876 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 3877 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 3878 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 3879 (Thanks to Stephen Colebourne for pointing to the decree.) 3880 3881 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 3882 3883 A new file 'backzone' contains data which may appeal to 3884 connoisseurs of old timestamps, although it is out of scope for 3885 the tz database, is often poorly sourced, and contains some data 3886 that is known to be incorrect. The new file is not recommended 3887 for ordinary use and its entries are not installed by default. 3888 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 3889 Isle of Man entries.) 3890 3891 Some more zones have been turned into links, when they differed 3892 from existing zones only for older timestamps. As usual, 3893 these changes affect UT offsets in pre-1970 timestamps only. 3894 Their old contents have been moved to the 'backzone' file. 3895 The affected zones are: Africa/Bangui, Africa/Brazzaville, 3896 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 3897 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 3898 3899 Changes affecting code 3900 3901 Unless NETBSD_INSPIRED is defined to 0, the tz library now 3902 supplies functions for creating and using objects that represent 3903 timezones. The new functions are tzalloc, tzfree, localtime_rz, 3904 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 3905 time2posix_z. They are intended for performance: for example, 3906 localtime_rz (unlike localtime_r) is trivially thread-safe without 3907 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 3908 functions, and to Alan Barrett and Jonathan Lennox for helping to 3909 debug the change.) 3910 3911 zdump now builds with the tz library unless USE_LTZ is defined to 0, 3912 This lets zdump use tz features even if the system library lacks them. 3913 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 3914 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 3915 3916 zdump now uses localtime_rz if available, as it's significantly faster, 3917 and it can help zdump better diagnose invalid timezone names. 3918 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 3919 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 3920 not available, zdump now uses localtime_r and tzset if available, 3921 as this is a bit cleaner and faster than plain localtime. Compile 3922 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 3923 lacks these two functions. 3924 3925 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 3926 Although not needed for tz's own applications, which are single-threaded, 3927 this supports POSIX better if the tz library is used in multithreaded apps. 3928 3929 Some crashes have been fixed when zdump or the tz library is given 3930 invalid or outlandish input. 3931 3932 The tz library no longer mishandles leap seconds on platforms with 3933 unsigned time_t in timezones that lack ordinary transitions after 1970. 3934 3935 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 3936 already defined, to make it easier to configure on common platforms. 3937 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 3938 3939 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 3940 assumes that reading uninitialized memory yields garbage values 3941 but does not cause other problems such as traps. 3942 3943 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 3944 more likely to guess right for ambiguous timestamps near 3945 transitions where tm_isdst does not change. 3946 3947 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 3948 strftime_l for compatibility with recent versions of POSIX. 3949 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 3950 to 1 on recent POSIX versions, and to 0 otherwise. 3951 3952 tzselect -c now uses a hybrid distance measure that works better 3953 in Africa. (Thanks to Alan Barrett for noting the problem.) 3954 3955 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 3956 or when time_tz is defined. 3957 3958 When HAVE_UTMPX_H is set the 'date' command now builds on systems 3959 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 3960 the date it updates the wtmpx file if _PATH_WTMPX is defined. 3961 This affects GNU/Linux and similar systems. 3962 3963 For easier maintenance later, some C code has been simplified, 3964 some lint has been removed, and the code has been tweaked so that 3965 plain 'make' is more likely to work. 3966 3967 The C type 'bool' is now used for boolean values, instead of 'int'. 3968 3969 The long-obsolete LOCALE_HOME code has been removed. 3970 3971 The long-obsolete 'gtime' function has been removed. 3972 3973 Changes affecting build procedure 3974 3975 'zdump' no longer links in ialloc.o, as it's not needed. 3976 3977 'make check_time_t_alternatives' no longer assumes GNU diff. 3978 3979 Changes affecting distribution tarballs 3980 3981 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 3982 the tzdata tarball instead of the tzcode tarball, since they help 3983 maintain the data. The NEWS and Theory files are now also 3984 distributed in the tzdata tarball, as they're relevant for data. 3985 (Thanks to Alan Barrett for pointing this out.) Also, the 3986 leapseconds.awk file is no longer distributed in the tzcode 3987 tarball, since it belongs in the tzdata tarball (where 2014f 3988 inadvertently also distributed it). 3989 3990 Changes affecting documentation and commentary 3991 3992 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 3993 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 3994 for debugging it.) 3995 3996 The man pages have been updated to use function prototypes, 3997 to document thread-safe variants like localtime_r, and to document 3998 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 3999 mktime_z. 4000 4001 The fields in Link lines have been renamed to be more descriptive 4002 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 4003 and LINK-TO has become LINK-NAME. 4004 4005 tz-link.htm mentions the IETF's tzdist working group; Windows 4006 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 4007 4008 Some broken URLs have been fixed in the commentary. (Thanks to 4009 Lester Caine.) 4010 4011 Commentary about Philippines DST has been updated, and commentary 4012 on pre-1970 time in India has been added. 4013 4014 4015 Release 2014f - 2014-08-05 17:42:36 -0700 4016 4017 Changes affecting future timestamps 4018 4019 Russia will subtract an hour from most of its time zones on 2014-10-26 4020 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 4021 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 4022 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 4023 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 4024 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 4025 (Europe/Samara) are not changing their clocks. The changed zones are 4026 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 4027 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 4028 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 4029 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 4030 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 4031 but not its UTC offset. Two zones are added: Asia/Chita (split 4032 from Asia/Yakutsk, and also with two hours subtracted) and 4033 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 4034 subtracted). (Thanks to Tim Parenti for much of the above.) 4035 4036 Changes affecting time zone abbreviations 4037 4038 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 4039 and similarly for the other Australian zones. That is, for eastern 4040 standard and daylight saving time the abbreviations are AEST and AEDT 4041 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 4042 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 4043 This change does not affect UT offsets, only time zone abbreviations. 4044 (Thanks to Rich Tibbett and many others.) 4045 4046 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 4047 effective 2014-10-26 at 02:00 local time. 4048 4049 The time zone abbreviation for Xinjiang Time (observed in rmqi) 4050 has been changed from URUT to XJT. (Thanks to Luther Ma.) 4051 4052 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 4053 Similarly, prefer EET/EEST for eastern European time in Russia. 4054 4055 Change time zone abbreviations in (western) Samoa to use "ST" and 4056 "DT" suffixes, as this is more likely to match common practice. 4057 Prefix "W" to (western) Samoa time when its standard-time offset 4058 disagrees with that of American Samoa. 4059 4060 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 4061 4062 Time zone abbreviations have been updated for Japan's two time 4063 zones used 1896-1937. JWST now stands for Western Standard 4064 Time, and JCST for Central Standard Time (formerly this was CJT). 4065 These abbreviations are now used for time in Korea, Taiwan, 4066 and Sakhalin while controlled by Japan. 4067 4068 Changes affecting past timestamps 4069 4070 China's five zones have been simplified to two, since the post-1970 4071 differences in the other three seem to have been imaginary. The 4072 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 4073 removed; backwards-compatibility links still work, albeit with 4074 different behaviors for timestamps before May 1980. Asia/Urumqi's 4075 1980 transition to UT +08 has been removed, so that it is now at 4076 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 4077 Treindl sent helpful translations of two papers by Guo Qingsheng.) 4078 4079 Some zones have been turned into links, when they differed from existing 4080 zones only for older UT offsets where data entries were likely invented. 4081 These changes affect UT offsets in pre-1970 timestamps only. This is 4082 similar to the change in release 2013e, except this time for western 4083 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 4084 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 4085 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 4086 Atlantic/St_Helena. This also affects the backwards-compatibility 4087 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 4088 Tim Parenti, and David Patte for reporting problems in earlier 4089 versions of this change.) 4090 4091 Asia/Shanghai's pre-standard-time UT offset has been changed from 4092 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 4093 transition to standard time has been changed from 1928 to 1901. 4094 4095 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 4096 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 4097 In 1946 it observed DST from 05-15 through 09-30; in 1947 4098 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 4099 (Thanks to Yu-Cheng Chuang.) 4100 4101 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 4102 4103 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 4104 10-03 at 00:00. (Thanks to Konstantin Hyppnen.) 4105 4106 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 4107 period from 1911 to 1950. 4108 4109 Pacific/Chatham has been changed to New Zealand standard time plus 4110 45 minutes for the period before 1957, reflecting a 1956 remark in 4111 the New Zealand parliament. 4112 4113 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 4114 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 4115 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 4116 not 04-06 at 02:00; and there was no DST in 1920. 4117 4118 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 4119 4120 Time in Russia before 1927 or so has been corrected by a few seconds in 4121 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 4122 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 4123 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 4124 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 4125 4126 Changes affecting data format 4127 4128 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 4129 The new file's extended format allows multiple country codes per zone. 4130 The older file is still installed but is deprecated; its format is 4131 not changing and it will still be distributed for a while, but new 4132 applications should use the new file. 4133 4134 The new file format simplifies maintenance of obscure locations. 4135 To test this, it adds coverage for the Crozet Islands and the 4136 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 4137 4138 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 4139 It is still ASCII now, but commentary about the switch has been added. 4140 The new file 'zone1970.tab' already uses UTF-8. 4141 4142 Changes affecting code 4143 4144 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 4145 is defined. (Thanks to Elliott Hughes for reporting the problem.) 4146 4147 'zic' no longer mishandles input when ignoring case in locales that 4148 are not compatible with English, e.g., unibyte Turkish locales when 4149 compiled with HAVE_GETTEXT. 4150 4151 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 4152 they no longer use ASCII '-' as if it were a dash. 4153 4154 'zic' now rejects output file names that contain '.' or '..' components. 4155 (Thanks to Tim Parenti for reporting the problem.) 4156 4157 'zic -v' now warns about output file names that do not follow 4158 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 4159 David Olson for starting the ball rolling on this.) 4160 4161 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 4162 4163 Changes affecting build procedure 4164 4165 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 4166 (Thanks to John Cochran.) 4167 4168 Changes affecting documentation and commentary 4169 4170 The 'Theory' file documents legacy names, the longstanding 4171 exceptions to the POSIX-inspired file name rules. 4172 4173 The 'zic' documentation clarifies the role of time types when 4174 interpreting dates. (Thanks to Arthur David Olson.) 4175 4176 Documentation and commentary now prefer UTF-8 to US-ASCII, 4177 allowing the use of proper accents in foreign words and names. 4178 Code and data have not changed because of this. (Thanks to 4179 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 4180 this.) 4181 4182 Non-HTML documentation and commentary now use plain-text URLs instead of 4183 HTML insertions, and are more consistent about bracketing URLs when they 4184 are not already surrounded by white space. (Thanks to suggestions by 4185 Steffen Nurpmeso.) 4186 4187 There is new commentary about Xujiahui Observatory, the five time-zone 4188 project in China from 1918 to 1949, timekeeping in Japanese-occupied 4189 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 4190 warlord Jin Shuren in the data. 4191 4192 Commentary about the coverage of each Russian zone has been standardized. 4193 (Thanks to Tim Parenti.) 4194 4195 There is new commentary about contemporary timekeeping in Ethiopia. 4196 4197 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 4198 4199 There is new commentary about time in Poland in 1919. 4200 4201 Proper credit has been given to DST inventor George Vernon Hudson. 4202 4203 Commentary about time in Metlakatla, AK and Resolute, NU has been 4204 improved, with a new source for the former. 4205 4206 In zone.tab, Pacific/Easter no longer mentions Salas y Gmez, as it 4207 is uninhabited. 4208 4209 Commentary about permanent Antarctic bases has been updated. 4210 4211 Several typos have been corrected. (Thanks to Tim Parenti for 4212 contributing some of these fixes.) 4213 4214 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 4215 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 4216 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 4217 (Thanks to a heads-up from Dirkjan Ochtman.) 4218 4219 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 4220 have been removed. These obsolescent US Naval Observatory entries were no 4221 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 4222 4223 4224 Release 2014e - 2014-06-12 21:53:52 -0700 4225 4226 Changes affecting near-future timestamps 4227 4228 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 4229 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 4230 switch to standard time at 24:00 the last Thursday before Ramadan, and 4231 back to DST at 00:00 the first Friday after Ramadan. 4232 4233 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 4234 to Milamber Space Network.) Guess that from 2015 on Morocco will 4235 temporarily switch to standard time at 03:00 the last Saturday before 4236 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 4237 4238 Changes affecting past timestamps 4239 4240 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 4241 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 4242 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 4243 in 1991. (Thanks to Hank W. for reporting the problems.) 4244 4245 Changes affecting commentary 4246 4247 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 4248 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 4249 removes stale pointers to World Time Explorer and WORLDTIME. 4250 4251 4252 Release 2014d - 2014-05-27 21:34:40 -0700 4253 4254 Changes affecting code 4255 4256 zic no longer generates files containing timestamps before the Big Bang. 4257 This works around GNOME glib bug 878 4258 <https://gitlab.gnome.org/GNOME/glib/issues/878> 4259 (Thanks to Leonardo Chiquitto for reporting the bug, and to 4260 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 4261 4262 Changes affecting documentation 4263 4264 tz-link.htm now mentions GNOME. 4265 4266 4267 Release 2014c - 2014-05-13 07:44:13 -0700 4268 4269 Changes affecting near-future timestamps 4270 4271 Egypt observes DST starting 2014-05-15 at 24:00. 4272 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 4273 Details have not been announced, except that DST will not be observed 4274 during Ramadan. Guess that DST will stop during the same Ramadan dates as 4275 Morocco, and that Egypt's future spring and fall transitions will be the 4276 same as 2010 when it last observed DST, namely April's last Friday at 4277 00:00 to September's last Thursday at 23:00 standard time. Also, guess 4278 that Ramadan transitions will be at 00:00 standard time. 4279 4280 Changes affecting code 4281 4282 zic now generates transitions for minimum time values, eliminating guesswork 4283 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 4284 4285 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 4286 4287 Changes affecting commentary and documentation 4288 4289 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 4290 4291 4292 Release 2014b - 2014-03-24 21:28:50 -0700 4293 4294 Changes affecting near-future timestamps 4295 4296 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 4297 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 4298 4299 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 4300 Bengt-Inge Larsson.) This is currently an approximation; a better version 4301 will require the zic and localtime fixes mentioned below, and the plan is 4302 to wait for a while until at least the zic fixes propagate. 4303 4304 Changes affecting code 4305 4306 'zic' and 'localtime' no longer reject locations needing four transitions 4307 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 4308 Also, 'zic' avoids some unlikely failures due to integer overflow. 4309 4310 Changes affecting build procedure 4311 4312 'make check' now detects Rule lines defined but never used. 4313 The NZAQ rules, an instance of this problem, have been removed. 4314 4315 Changes affecting commentary and documentation 4316 4317 Fix Tuesday/Thursday typo in description of time in Israel. 4318 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 4319 4320 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 4321 to Donald MacQueen.) Instead, the Microsoft Windows Store app 4322 library supports them. 4323 4324 Add comments about Johnston Island time in the 1960s. 4325 (Thanks to Lyle McElhaney.) 4326 4327 Morocco's 2014 DST start will be as predicted. 4328 (Thanks to Sebastien Willemijns.) 4329 4330 4331 Release 2014a - 2014-03-07 23:30:29 -0800 4332 4333 Changes affecting near-future timestamps 4334 4335 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 4336 the heads-up, and to Tim Parenti for simplifying the update.) 4337 4338 Changes affecting past timestamps 4339 4340 Fiji ended DST on 2014-01-19 at 02:00, not the previously scheduled 03:00. 4341 (Thanks to Steffen Thorsen.) 4342 4343 Ukraine switched from Moscow to Eastern European time on 1990-07-01 4344 (not 1992-01-01), and observed DST during the entire next winter. 4345 (Thanks to Vladimir in Moscow via Alois Treindl.) 4346 4347 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 4348 (Thanks to Avigdor Finkelstein.) 4349 4350 Changes affecting code 4351 4352 A uninitialized-storage bug in 'localtime' has been fixed. 4353 (Thanks to Logan Chien.) 4354 4355 Changes affecting the build procedure 4356 4357 The settings for 'make check_web' now default to Ubuntu 13.10. 4358 4359 Changes affecting commentary and documentation 4360 4361 The boundary of the US Pacific time zone is given more accurately. 4362 (Thanks to Alan Mintz.) 4363 4364 Chile's 2014 DST will be as predicted. (Thanks to Jos Miguel Garrido.) 4365 4366 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Ral Perasso.) 4367 4368 Better descriptions of countries with same time zone history as 4369 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 4370 4371 Several changes affect tz-link.htm, the main web page. 4372 4373 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 4374 David Braverman). 4375 4376 Mention xCal (Internet RFC 6321) and jCal. 4377 4378 Microsoft has some support for tz database names. 4379 4380 CLDR data formats include both XML and JSON. 4381 4382 Mention Maggiolo's map of solar vs standard time. 4383 (Thanks to Arthur David Olson.) 4384 4385 Mention TZ4Net. (Thanks to Matt Johnson.) 4386 4387 Mention the timezone-olson Haskell package. 4388 4389 Mention zeitverschiebung.net. (Thanks to Martin Jger.) 4390 4391 Remove moribund links to daylight-savings-time.info and to 4392 Simple Timer + Clocks. 4393 4394 Update two links. (Thanks to Oscar van Vlijmen.) 4395 4396 Fix some formatting glitches, e.g., remove random newlines from 4397 abbr elements' title attributes. 4398 4399 4400 Release 2013i - 2013-12-17 07:25:23 -0800 4401 4402 Changes affecting near-future timestamps: 4403 4404 Jordan switches back to standard time at 00:00 on December 20, 2013. 4405 The 2006-2011 transition schedule is planned to resume in 2014. 4406 (Thanks to Steffen Thorsen.) 4407 4408 Changes affecting past timestamps: 4409 4410 In 2004, Cuba began DST on March 28, not April 4. 4411 (Thanks to Steffen Thorsen.) 4412 4413 Changes affecting code 4414 4415 The compile-time flag NOSOLAR has been removed, as nowadays the 4416 benefit of slightly shrinking runtime table size is outweighed by the 4417 cost of disallowing potential future updates that exceed old limits. 4418 4419 Changes affecting documentation and commentary 4420 4421 The files solar87, solar88, and solar89 are no longer distributed. 4422 They were a negative experiment - that is, a demonstration that 4423 tz data can represent solar time only with some difficulty and error. 4424 Their presence in the distribution caused confusion, as Riyadh 4425 civil time was generally not solar time in those years. 4426 4427 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 4428 4429 4430 Release 2013h - 2013-10-25 15:32:32 -0700 4431 4432 Changes affecting current and future timestamps: 4433 4434 Libya has switched its UT offset back to +02 without DST, instead 4435 of +01 with DST. (Thanks to Even Scharning.) 4436 4437 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 4438 (Thanks to Gwillim Law.) 4439 4440 Changes affecting future timestamps: 4441 4442 Acre and (we guess) western Amazonas will switch from UT -04 to -05 4443 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 4444 (Thanks to Steffen Thorsen.) 4445 4446 Add entries for DST transitions in Morocco in the year 2038. 4447 This avoids some year-2038 glitches introduced in 2013g. 4448 (Thanks to Yoshito Umaoka for reporting the problem.) 4449 4450 Changes affecting API 4451 4452 The 'tzselect' command no longer requires the 'select' command, 4453 and should now work with /bin/sh on more platforms. It also works 4454 around a bug in BusyBox awk before version 1.21.0. (Thanks to 4455 Patrick 'P. J.' McDermott and Alan Barrett.) 4456 4457 Changes affecting code 4458 4459 Fix localtime overflow bugs with 32-bit unsigned time_t. 4460 4461 zdump no longer assumes sscanf returns maximal values on overflow. 4462 4463 Changes affecting the build procedure 4464 4465 The builder can specify which programs to use, if any, instead of 4466 'ar' and 'ranlib', and libtz.a is now built locally before being 4467 installed. (Thanks to Michael Forney.) 4468 4469 A dependency typo in the 'zdump' rule has been fixed. 4470 (Thanks to Andrew Paprocki.) 4471 4472 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 4473 work as specified by POSIX.2-1992 or later; this is portable nowadays. 4474 4475 'make clean' no longer removes 'leapseconds', since it's 4476 host-independent and is part of the distribution. 4477 4478 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 4479 4480 Changes affecting documentation and commentary 4481 4482 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 4483 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 4484 4485 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 4486 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 4487 longer maintained) and for old advisories. SOFA now does C. 4488 4489 Release 2013g - 2013-09-30 21:08:26 -0700 4490 4491 Changes affecting current and near-future timestamps 4492 4493 Morocco now observes DST from the last Sunday in March to the last 4494 Sunday in October, not April to September respectively. (Thanks 4495 to Steffen Thorsen.) 4496 4497 Changes affecting 'zic' 4498 4499 'zic' now runs on platforms that lack both hard links and symlinks. 4500 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 4501 Also, fix some bugs on platforms that lack hard links but have symlinks. 4502 4503 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 4504 to predict the far future, fixing a bug introduced in 2013e. 4505 4506 Changes affecting the build procedure 4507 4508 The 'leapseconds' file is again put into the tzdata tarball. 4509 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 4510 Matt Burgess and Ian Abbott.) The timestamps of these and other 4511 dependent files in tarballs are adjusted more consistently. 4512 4513 Changes affecting documentation and commentary 4514 4515 The README file is now part of the data tarball as well as the code. 4516 It now states that files are public domain unless otherwise specified. 4517 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 4518 Its details about the 1989 release moved to a place of honor near 4519 the end of NEWS. 4520 4521 4522 Release 2013f - 2013-09-24 23:37:36 -0700 4523 4524 Changes affecting near-future timestamps 4525 4526 Tocantins will very likely not observe DST starting this spring. 4527 (Thanks to Steffen Thorsen.) 4528 4529 Jordan will likely stay at UT +03 indefinitely, and will not fall 4530 back this fall. 4531 4532 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 4533 4534 Changes affecting API 4535 4536 The types of the global variables 'timezone' and 'altzone' (if present) 4537 have been changed back to 'long'. This is required for 'timezone' 4538 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 4539 These variables were originally 'long' in the tz code, but were 4540 mistakenly changed to 'time_t' in 1987; nobody reported the 4541 incompatibility until now. The difference matters on x32, where 4542 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 4543 4544 Changes affecting the build procedure 4545 4546 Avoid long strings in leapseconds.awk to work around a mawk bug. 4547 (Thanks to Cyril Baurand.) 4548 4549 Changes affecting documentation and commentary 4550 4551 New file 'NEWS' that contains release notes like this one. 4552 4553 Paraguay's law does not specify DST transition time; 00:00 is customary. 4554 (Thanks to Waldemar Villamayor-Venialbo.) 4555 4556 Minor capitalization fixes. 4557 4558 Changes affecting version-control only 4559 4560 The experimental GitHub repository now contains annotated and 4561 signed tags for recent releases, e.g., '2013e' for Release 2013e. 4562 Releases are tagged starting with 2012e; earlier releases were 4563 done differently, and tags would either not have a simple name or 4564 not exactly match what was released. 4565 4566 'make set-timestamps' is now simpler and a bit more portable. 4567 4568 4569 Release 2013e - 2013-09-19 23:50:04 -0700 4570 4571 Changes affecting near-future timestamps 4572 4573 This year Fiji will start DST on October 27, not October 20. 4574 (Thanks to David Wheeler for the heads-up.) For now, guess that 4575 Fiji will continue to spring forward the Sunday before the fourth 4576 Monday in October. 4577 4578 Changes affecting current and future time zone abbreviations 4579 4580 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 4581 time zone abbreviations since 1932. (Thanks to George Ziegler, 4582 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 4583 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 4584 Asia/Makassar, and Asia/Pontianak. 4585 4586 Use ART (UT -03, standard time), rather than WARST (also -03, but 4587 daylight saving time) for San Luis, Argentina since 2009. 4588 4589 Changes affecting Godthb timestamps after 2037 if version mismatch 4590 4591 Allow POSIX-like TZ strings where the transition time's hour can 4592 range from -167 through 167, instead of the POSIX-required 0 4593 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 4594 new Fiji rules. This is a more compact way to represent 4595 far-future timestamps for America/Godthab, America/Santiago, 4596 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 4597 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 4598 this change. (Derived from a suggestion by Arthur David Olson.) 4599 4600 Allow POSIX-like TZ strings where daylight saving time is in 4601 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 4602 Argentina Summer Time all year. This supports a more compact way 4603 to represent the 2013d data for America/Argentina/San_Luis. 4604 Because of the change for San Luis noted above this change does not 4605 affect the current data. (Thanks to Andrew Main (Zefram) for 4606 suggestions that improved this change.) 4607 4608 Where these two TZ changes take effect, there is a minor extension 4609 to the tz file format in that it allows new values for the 4610 embedded TZ-format string, and the tz file format version number 4611 has therefore been increased from 2 to 3 as a precaution. 4612 Version-2-based client code should continue to work as before for 4613 all timestamps before 2038. Existing version-2-based client code 4614 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 4615 files, and typically works in practice even for timestamps after 4616 2037; the only known exception is America/Godthab. 4617 4618 Changes affecting timestamps before 1970 4619 4620 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 4621 some errors before 1947. 4622 4623 Some zones have been turned into links, when they differ from existing 4624 zones only in older data entries that were likely invented or that 4625 differ only in LMT or transitions from LMT. These changes affect 4626 only timestamps before 1943. The affected zones are: 4627 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 4628 America/Grenada, America/Guadeloupe, America/Marigot, 4629 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 4630 America/St_Lucia, America/St_Thomas, America/St_Vincent, 4631 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 4632 confirming that the old Europe/Vaduz zone was wrong and the new 4633 link is better for WWII-era times.) 4634 4635 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 4636 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 4637 from 1890 to 1912. 4638 4639 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 4640 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 4641 to Alois Treindl.) 4642 4643 Change the date of the circa-1850 Zurich transition from 1849-09-12 4644 to 1853-07-16, overriding Shanks with data from Messerli about 4645 postal and telegraph time in Switzerland. 4646 4647 Changes affecting time zone abbreviations before 1970 4648 4649 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 4650 as Jakarta was called Batavia back then. 4651 4652 Changes affecting API 4653 4654 The 'zic' command now outputs a dummy transition when far-future 4655 data can't be summarized using a TZ string, and uses a 402-year 4656 window rather than a 400-year window. For the current data, this 4657 affects only the Asia/Tehran file. It does not affect any of the 4658 timestamps that this file represents, so zdump outputs the same 4659 information as before. (Thanks to Andrew Main (Zefram).) 4660 4661 The 'date' command has a new '-r' option, which lets you specify 4662 the integer time to display, a la FreeBSD. 4663 4664 The 'tzselect' command has two new options '-c' and '-n', which lets you 4665 select a zone based on latitude and longitude. 4666 4667 The 'zic' command's '-v' option now warns about constructs that 4668 require the new version-3 binary file format. (Thanks to Arthur 4669 David Olson for the suggestion.) 4670 4671 Support for floating-point time_t has been removed. 4672 It was always dicey, and POSIX no longer requires it. 4673 (Thanks to Eric Blake for suggesting to the POSIX committee to 4674 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 4675 Heninger, Arthur David Olson, and Alois Treindl, for reporting 4676 bugs and elucidating some of the corners of the old floating-point 4677 implementation.) 4678 4679 The signatures of 'offtime', 'timeoff', and 'gtime' have been 4680 changed back to the old practice of using 'long' to represent UT 4681 offsets. This had been inadvertently and mistakenly changed to 4682 'int_fast32_t'. (Thanks to Christos Zoulas.) 4683 4684 The code avoids undefined behavior on integer overflow in some 4685 more places, including gmtime, localtime, mktime and zdump. 4686 4687 Changes affecting the zdump utility 4688 4689 zdump now outputs "UT" when referring to Universal Time, not "UTC". 4690 "UTC" does not make sense for timestamps that predate the introduction 4691 of UTC, whereas "UT", a more generic term, does. (Thanks to Steve Allen 4692 for clarifying UT vs UTC.) 4693 4694 Data changes affecting behavior of tzselect and similar programs 4695 4696 Country code BQ is now called the more common name "Caribbean Netherlands" 4697 rather than the more official "Bonaire, St Eustatius & Saba". 4698 4699 Remove from zone.tab the names America/Montreal, America/Shiprock, 4700 and Antarctica/South_Pole, as they are equivalent to existing 4701 same-country-code zones for post-1970 timestamps. The data entries for 4702 these names are unchanged, so the names continue to work as before. 4703 4704 Changes affecting code internals 4705 4706 zic -c now runs way faster on 64-bit hosts when given large numbers. 4707 4708 zic now uses vfprintf to avoid allocating and freeing some memory. 4709 4710 tzselect now computes the list of continents from the data, 4711 rather than have it hard-coded. 4712 4713 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 4714 4715 Changes affecting the build procedure 4716 4717 The 'leapseconds' file is now generated automatically from a 4718 new file 'leap-seconds.list', which is a copy of 4719 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 4720 A new source file 'leapseconds.awk' implements this. 4721 The goal is simplification of the future maintenance of 'leapseconds'. 4722 4723 When building the 'posix' or 'right' subdirectories, if the 4724 subdirectory would be a copy of the default subdirectory, it is 4725 now made a symbolic link if that is supported. This saves about 4726 2 MB of file system space. 4727 4728 The links America/Shiprock and Antarctica/South_Pole have been 4729 moved to the 'backward' file. This affects only nondefault builds 4730 that omit 'backward'. 4731 4732 Changes affecting version-control only 4733 4734 .gitignore now ignores 'date'. 4735 4736 Changes affecting documentation and commentary 4737 4738 Changes to the 'tzfile' man page 4739 4740 It now mentions that the binary file format may be extended in 4741 future versions by appending data. 4742 4743 It now refers to the 'zdump' and 'zic' man pages. 4744 4745 Changes to the 'zic' man page 4746 4747 It lists conditions that elicit a warning with '-v'. 4748 4749 It says that the behavior is unspecified when duplicate names 4750 are given, or if the source of one link is the target of another. 4751 4752 Its examples are updated to match the latest data. 4753 4754 The definition of white space has been clarified slightly. 4755 (Thanks to Michael Deckers.) 4756 4757 Changes to the 'Theory' file 4758 4759 There is a new section about the accuracy of the tz database, 4760 describing the many ways that errors can creep in, and 4761 explaining why so many of the pre-1970 timestamps are wrong or 4762 misleading (thanks to Steve Allen, Lester Caine, and Garrett 4763 Wollman for discussions that contributed to this). 4764 4765 The 'Theory' file describes LMT better (this follows a 4766 suggestion by Guy Harris). 4767 4768 It refers to the 2013 edition of POSIX rather than the 2004 edition. 4769 4770 It's mentioned that excluding 'backward' should not affect the 4771 other data, and it suggests at least one zone.tab name per 4772 inhabited country (thanks to Stephen Colebourne). 4773 4774 Some longstanding restrictions on names are documented, e.g., 4775 'America/New_York' precludes 'America/New_York/Bronx'. 4776 4777 It gives more reasons for the 1970 cutoff. 4778 4779 It now mentions which time_t variants are supported, such as 4780 signed integer time_t. (Thanks to Paul Goyette for reporting 4781 typos in an experimental version of this change.) 4782 4783 (Thanks to Philip Newton for correcting typos in these changes.) 4784 4785 Documentation and commentary is more careful to distinguish UT in 4786 general from UTC in particular. (Thanks to Steve Allen.) 4787 4788 Add a better source for the Zurich 1894 transition. 4789 (Thanks to Pierre-Yves Berger.) 4790 4791 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 4792 4793 4794 Release 2013d - 2013-07-05 07:38:01 -0700 4795 4796 Changes affecting future timestamps: 4797 4798 Morocco's midsummer transitions this year are July 7 and August 10, 4799 not July 9 and August 8. (Thanks to Andrew Paprocki.) 4800 4801 Israel now falls back on the last Sunday of October. 4802 (Thanks to Ephraim Silverberg.) 4803 4804 Changes affecting past timestamps: 4805 4806 Specify Jerusalem's location more precisely; this changes the pre-1880 4807 times by 2 s. 4808 4809 Changing affecting metadata only: 4810 4811 Fix typos in the entries for country codes BQ and SX. 4812 4813 Changes affecting code: 4814 4815 Rework the code to fix a bug with handling Australia/Macquarie on 4816 32-bit hosts (thanks to Arthur David Olson). 4817 4818 Port to platforms like NetBSD, where time_t can be wider than long. 4819 4820 Add support for testing time_t types other than the system's. 4821 Run 'make check_time_t_alternatives' to try this out. 4822 Currently, the tests fail for unsigned time_t; 4823 this should get fixed at some point. 4824 4825 Changes affecting documentation and commentary: 4826 4827 Deemphasize the significance of national borders. 4828 4829 Update the zdump man page. 4830 4831 Remove obsolete NOID comment (thanks to Denis Excoffier). 4832 4833 Update several URLs and comments in the web pages. 4834 4835 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 4836 4837 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 4838 4839 4840 Release 2013c - 2013-04-19 16:17:40 -0700 4841 4842 Changes affecting current and future timestamps: 4843 4844 Palestine observed DST starting March 29, 2013. (Thanks to 4845 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 4846 with the predicted rules being the last Thursday in March at 24:00 4847 to the first Friday on or after September 21 at 01:00. 4848 4849 Assume that the recent change to Paraguay's DST rules is permanent, 4850 by moving the end of DST to the 4th Sunday in March every year. 4851 (Thanks to Carlos Ral Perasso.) 4852 4853 Changes affecting past timestamps: 4854 4855 Fix some historical data for Palestine to agree with that of 4856 timeanddate.com, as follows: 4857 4858 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 4859 00:00 Apr 1. 4860 4861 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 4862 02:00. 4863 4864 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 4865 4866 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 4867 4868 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 4869 4870 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 4871 4872 Fix times of habitation for Macquarie to agree with the Tasmania 4873 Parks & Wildlife Service history, which indicates that permanent 4874 habitation was 1899-1919 and 1948 on. 4875 4876 Changing affecting metadata only: 4877 4878 Macquarie Island is politically part of Australia, not Antarctica. 4879 (Thanks to Tobias Conradi.) 4880 4881 Sort Macquarie more consistently with other parts of Australia. 4882 (Thanks to Tim Parenti.) 4883 4884 4885 Release 2013b - 2013-03-10 22:33:40 -0700 4886 4887 Changes affecting current and future timestamps: 4888 4889 Haiti uses US daylight-saving rules this year, and presumably future years. 4890 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 4891 4892 Paraguay will end DST on March 24 this year. 4893 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 4894 4895 Morocco does not observe DST during Ramadan; 4896 try to predict Ramadan in Morocco as best we can. 4897 (Thanks to Erik Homoet for the heads-up.) 4898 4899 Changes affecting commentary: 4900 4901 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 4902 Update URL for Solaris. Mention Internet RFC 6557. 4903 Update Internet RFCs 2445->5545, 2822->5322. 4904 Switch from FTP to HTTP for Internet RFCs. 4905 4906 4907 Release 2013a - 2013-02-27 09:20:35 -0800 4908 4909 Change affecting binary data format: 4910 4911 The zone offset at the end of version-2-format zone files is now 4912 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 4913 4914 Changes affecting current and future timestamps: 4915 4916 Chile's 2013 rules, and we guess rules for 2014 and later, will be 4917 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 4918 (Thanks to Steffen Thorsen and Robert Elz.) 4919 4920 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 4921 (Thanks to Tobias Conradi and Arthur David Olson.) 4922 4923 Many changes affect historical timestamps before 1940. 4924 These were deduced from: Milne J. Civil time. Geogr J. 1899 4925 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 4926 4927 Changes affecting the code: 4928 4929 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 4930 the data). (Thanks to Arthur David Olson.) 4931 4932 Fix localtime bug when time_t is unsigned and data files were generated 4933 by a signed time_t system. (Thanks to Doug Bailey for reporting and 4934 to Arthur David Olson for fixing.) 4935 4936 Allow the email address for bug reports to be set by the packager. 4937 The default is tz (a] iana.org, as before. (Thanks to Joseph S. Myers.) 4938 4939 Update HTML checking to be compatible with Ubuntu 12.10. 4940 4941 Check that files are a safe subset of ASCII. At some point we may 4942 relax this requirement to a safe subset of UTF-8. Without the 4943 check, some non-UTF-8 encodings were leaking into the distribution. 4944 4945 Commentary changes: 4946 4947 Restore a comment about copyright notices that was inadvertently deleted. 4948 (Thanks to Arthur David Olson.) 4949 4950 Improve the commentary about which districts observe what times 4951 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 4952 4953 Add web page links to tz.js. 4954 4955 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 4956 4957 4958 Release 2012j - 2012-11-12 18:34:49 -0800 4959 4960 Libya moved to CET this weekend, but with DST planned next year. 4961 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 4962 4963 Signatures now have the extension .asc, not .sign, as that's more 4964 standard. (Thanks to Phil Pennock.) 4965 4966 The output of 'zdump --version', and of 'zic --version', now 4967 uses a format that is more typical for --version. 4968 (Thanks to Joseph S. Myers.) 4969 4970 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 4971 now uses tz (a] iana.org rather than the old elsie address. 4972 4973 zic -v now complains about abbreviations that are less than 3 4974 or more than 6 characters, as per POSIX. Formerly, it checked 4975 for abbreviations that were more than 3. 4976 4977 'make public' no longer puts its temporary directory under /tmp, 4978 and uses the just-built zic rather than the system zic. 4979 4980 Various fixes to documentation and commentary. 4981 4982 4983 Release 2012i - 2012-11-03 12:57:09 -0700 4984 4985 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 4986 4987 Linker flags can now be specified via LDFLAGS. 4988 AWK now defaults to 'awk', not 'nawk'. 4989 The shell in tzselect now defaults to /bin/bash, but this can 4990 be overridden by specifying KSHELL. 4991 The main web page now mentions the unofficial GitHub repository. 4992 (Thanks to Mike Frysinger.) 4993 4994 Tarball signatures can now be built by running 'make signatures'. 4995 There are also new makefile rules 'tarballs', 'check_public', and 4996 separate makefile rules for each tarball and signature file. 4997 A few makefile rules are now more portable to strict POSIX. 4998 4999 The main web page now lists the canonical IANA URL. 5000 5001 5002 Release 2012h - 2012-10-26 22:49:10 -0700 5003 5004 Bahia no longer has DST. (Thanks to Kelley Cook.) 5005 5006 Tocantins has DST. (Thanks to Rodrigo Severo.) 5007 5008 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 5009 5010 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 5011 5012 Web page updates. 5013 5014 More C modernization, except that at Arthur David Olson's suggestion 5015 the instances of 'register' were kept. 5016 5017 5018 Release 2012g - 2012-10-17 20:59:45 -0700 5019 5020 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 5021 5022 Palestine fall 2012. (Thanks to Steffen Thorsen.) 5023 5024 Assume C89. 5025 5026 To attack the version-number problem, this release ships the file 5027 'Makefile' (which contains the release number) in both the tzcode and 5028 the tzdata tarballs. The two Makefiles are identical, and should be 5029 identical in any matching pair of tarballs, so it shouldn't matter 5030 which order you extract the tarballs. Perhaps we can come up with a 5031 better version-number scheme at some point; this scheme does have the 5032 virtue of not adding more files. 5033 5034 5035 Release 2012f - 2012-09-12 23:17:03 -0700 5036 5037 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 5038 20 this year. (Thanks to Steffen Thorsen.) 5039 5040 5041 Release 2012e - 2012-08-02 20:44:55 -0700 5042 5043 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 5044 (Thanks to Steffen Thorsen.) 5045 5046 * Use a single version number for both code and data. 5047 5048 * .gitignore: New file. 5049 5050 * Remove trailing white space. 5051 5052 5053 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 5054 5055 Changes for Morocco's timestamps, which take effect in a couple of 5056 hours, along with infrastructure changes to accommodate how the tz 5057 code and data are released on IANA. 5058 5059 5060 Release data2012c - 2012-03-27 12:17:25 -0400 5061 5062 africa 5063 Summer time changes for Morocco (to start late April 2012) 5064 5065 asia 5066 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 5067 5068 northamerica 5069 Haiti following US/Canada rules for 2012 (and we're assuming, 5070 for now anyway, for the future). 5071 5072 5073 Release 2012b - 2012-03-02 12:29:15 +0700 5074 5075 There is just one change to tzcode2012b (compared with 2012a): 5076 the Makefile that was accidentally included with 2012a has been 5077 replaced with the version that should have been there, which is 5078 identical with the previous version (from tzcode2011i). 5079 5080 There are just two changes in tzdata2012b compared with 2012a. 5081 5082 Most significantly, summer time in Cuba has been delayed 3 weeks 5083 (now starts April 1 rather than March 11). Since Mar 11 (the old start 5084 date, as listed in 2012a) is just a little over a week away, this 5085 change is urgent. 5086 5087 Less importantly, an excess tab in one of the changes in zone.tab 5088 in 2012a has been removed. 5089 5090 5091 Release 2012a - 2012-03-01 18:28:10 +0700 5092 5093 The changes in tzcode2012a (compared to the previous version, 2011i) 5094 are entirely to the README and tz-art.htm and tz-link.htm files, if 5095 none of those concern you, you can ignore the code update. The changes 5096 reflect the changed addresses for the mailing list and the code and 5097 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 5098 has been added to tz-link.htm). 5099 5100 In tzdata2012a (compared to the previous release, which was 2011n) 5101 the major changes are: 5102 Chile 2011/2012 and 2012/2013 summer time date adjustments. 5103 Falkland Islands onto permanent summer time (we're assuming for the 5104 foreseeable future, though 2012 is all we're fairly certain of.) 5105 Armenia has abolished Summer Time. 5106 Tokelau jumped the International Date Line back last December 5107 (just the same as their near neighbour, Samoa). 5108 America/Creston is a new zone for a small area of British Columbia 5109 There will be a leapsecond 2012-06-30 23:59:60 UTC. 5110 5111 Other minor changes are: 5112 Corrections to 1918 Canadian summer time end dates. 5113 Updated URL for UK time zone history (in comments) 5114 A few typos in Le Corre's list of free French place names (comments) 5115 5116 5117 Release data2011n - 2011-10-30 14:57:54 +0700 5118 5119 There are three changes of note - most urgently, Cuba (America/Havana) 5120 has extended summer time by two weeks, now to end on Nov 13, rather than 5121 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 5122 (Europe/Tiraspol) decided not to split from the rest of Moldova after 5123 all, and consequently that zone has been removed (again) and reinstated 5124 in the "backward" file as a link to Europe/Chisinau. And third, the 5125 end date for Fiji's summer time this summer was moved forward from the 5126 earlier planned Feb 26, to Jan 22. 5127 5128 Apart from that, Moldova (MD) returns to a single entry in zone.tab 5129 (and the incorrect syntax that was in the 2011m version of that file 5130 is so fixed - it would have been fixed in a different way had this 5131 change not happened - that's the "missing" sccs version id). 5132 5133 5134 Release data2011m - 2011-10-24 21:42:16 +0700 5135 5136 In particular, the typos in comments in the data (2011-11-17 should have 5137 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 5138 Tim Parenti noted) have been fixed, and the change for Ukraine has been 5139 made in all 4 Ukrainian zones, rather than just Europe/Kiev 5140 (again, thanks to Tim Parenti, and also Denys Gavrysh). 5141 5142 In addition, I added Europe/Tiraspol to zone.tab. 5143 5144 This time, all the files have new version numbers... (including the files 5145 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 5146 version numbers there...) 5147 5148 5149 Release data2011l - 2011-10-10 11:15:43 +0700 5150 5151 There are just 2 changes that cause different generated tzdata files from 5152 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 5153 is included, but commented out. Compared with the diff I sent out last week, 5154 this version also includes attributions for the sources for the changes 5155 (in much the same format as ado used, but the html tags have not been 5156 checked, verified, or used in any way at all, so if there are errors there, 5157 please let me know.) 5158 5159 5160 Release data2011k - 2011-09-20 17:54:03 -0400 5161 5162 [not summarized] 5163 5164 5165 Release data2011j - 2011-09-12 09:22:49 -0400 5166 5167 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 5168 Tanzania); there are also two spelling corrections to comments in 5169 the australasia file (with thanks to Christos Zoulas). 5170 5171 5172 Release 2011i - 2011-08-29 05:56:32 -0400 5173 5174 [not summarized] 5175 5176 5177 Release data2011h - 2011-06-15 18:41:48 -0400 5178 5179 Russia and Curaao changes 5180 5181 5182 Release 2011g - 2011-04-25 09:07:22 -0400 5183 5184 update the rules for Egypt to reflect its abandonment of DST this year 5185 5186 5187 Release 2011f - 2011-04-06 17:14:53 -0400 5188 5189 [not summarized] 5190 5191 5192 Release 2011e - 2011-03-31 16:04:38 -0400 5193 5194 Morocco, Chile, and tz-link changes 5195 5196 5197 Release 2011d - 2011-03-14 09:18:01 -0400 5198 5199 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 5200 5201 5202 Release 2011c - 2011-03-07 09:30:09 -0500 5203 5204 These do affect current timestamps in Chile and Annette Island, Canada. 5205 5206 5207 Release 2011b - 2011-02-07 08:44:50 -0500 5208 5209 [not summarized] 5210 5211 5212 Release 2011a - 2011-01-24 10:30:16 -0500 5213 5214 [not summarized] 5215 5216 5217 Release data2010o - 2010-11-01 09:18:23 -0400 5218 5219 change to the end of DST in Fiji in 2011 5220 5221 5222 Release 2010n - 2010-10-25 08:19:17 -0400 5223 5224 [not summarized] 5225 5226 5227 Release 2010m - 2010-09-27 09:24:48 -0400 5228 5229 Hong Kong, Vostok, and zic.c changes 5230 5231 5232 Release 2010l - 2010-08-16 06:57:25 -0400 5233 5234 [not summarized] 5235 5236 5237 Release 2010k - 2010-07-26 10:42:27 -0400 5238 5239 [not summarized] 5240 5241 5242 Release 2010j - 2010-05-10 09:07:48 -0400 5243 5244 changes for Baha de Banderas and for version naming 5245 5246 5247 Release data2010i - 2010-04-16 18:50:45 -0400 5248 5249 the end of DST in Morocco on 2010-08-08 5250 5251 5252 Release data2010h - 2010-04-05 09:58:56 -0400 5253 5254 [not summarized] 5255 5256 5257 Release data2010g - 2010-03-24 11:14:53 -0400 5258 5259 [not summarized] 5260 5261 5262 Release 2010f - 2010-03-22 09:45:46 -0400 5263 5264 [not summarized] 5265 5266 5267 Release data2010e - 2010-03-08 14:24:27 -0500 5268 5269 corrects the Dhaka bug found by Danvin Ruangchan 5270 5271 5272 Release data2010d - 2010-03-06 07:26:01 -0500 5273 5274 [not summarized] 5275 5276 5277 Release 2010c - 2010-03-01 09:20:58 -0500 5278 5279 changes including KRE's suggestion for earlier initialization of 5280 "goahead" and "goback" structure elements 5281 5282 5283 Release code2010a - 2010-02-16 10:40:04 -0500 5284 5285 [not summarized] 5286 5287 5288 Release data2010b - 2010-01-20 12:37:01 -0500 5289 5290 Mexico changes 5291 5292 5293 Release data2010a - 2010-01-18 08:30:04 -0500 5294 5295 changes to Dhaka 5296 5297 5298 Release data2009u - 2009-12-26 08:32:28 -0500 5299 5300 changes to DST in Bangladesh 5301 5302 5303 Release 2009t - 2009-12-21 13:24:27 -0500 5304 5305 [not summarized] 5306 5307 5308 Release data2009s - 2009-11-14 10:26:32 -0500 5309 5310 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 5311 5312 5313 Release 2009r - 2009-11-09 10:10:31 -0500 5314 5315 "antarctica" and "tz-link.htm" changes 5316 5317 5318 Release 2009q - 2009-11-02 09:12:40 -0500 5319 5320 with two corrections as reported by Eric Muller and Philip Newton 5321 5322 5323 Release data2009p - 2009-10-23 15:05:27 -0400 5324 5325 Argentina (including San Luis) changes (with the correction from 5326 Mariano Absatz) 5327 5328 5329 Release data2009o - 2009-10-14 16:49:38 -0400 5330 5331 Samoa (commentary only), Pakistan, and Bangladesh changes 5332 5333 5334 Release data2009n - 2009-09-22 15:13:38 -0400 5335 5336 added commentary for Argentina and a change to the end of DST in 5337 2009 in Pakistan 5338 5339 5340 Release data2009m - 2009-09-03 10:23:43 -0400 5341 5342 Samoa and Palestine changes 5343 5344 5345 Release data2009l - 2009-08-14 09:13:07 -0400 5346 5347 Samoa (comments only) and Egypt 5348 5349 5350 Release 2009k - 2009-07-20 09:46:08 -0400 5351 5352 [not summarized] 5353 5354 5355 Release data2009j - 2009-06-15 06:43:59 -0400 5356 5357 Bangladesh change (with a short turnaround since the DST change is 5358 impending) 5359 5360 5361 Release 2009i - 2009-06-08 09:21:22 -0400 5362 5363 updating for DST in Bangladesh this year 5364 5365 5366 Release 2009h - 2009-05-26 09:19:14 -0400 5367 5368 [not summarized] 5369 5370 5371 Release data2009g - 2009-04-20 16:34:07 -0400 5372 5373 Cairo 5374 5375 5376 Release data2009f - 2009-04-10 11:00:52 -0400 5377 5378 correct DST in Pakistan 5379 5380 5381 Release 2009e - 2009-04-06 09:08:11 -0400 5382 5383 [not summarized] 5384 5385 5386 Release 2009d - 2009-03-23 09:38:12 -0400 5387 5388 Morocco, Tunisia, Argentina, and American Astronomical Society changes 5389 5390 5391 Release data2009c - 2009-03-16 09:47:51 -0400 5392 5393 change to the start of Cuban DST 5394 5395 5396 Release 2009b - 2009-02-09 11:15:22 -0500 5397 5398 [not summarized] 5399 5400 5401 Release 2009a - 2009-01-21 10:09:39 -0500 5402 5403 [not summarized] 5404 5405 5406 Release data2008i - 2008-10-21 12:10:25 -0400 5407 5408 southamerica and zone.tab files, with Argentina DST rule changes and 5409 United States zone reordering and recommenting 5410 5411 5412 Release 2008h - 2008-10-13 07:33:56 -0400 5413 5414 [not summarized] 5415 5416 5417 Release 2008g - 2008-10-06 09:03:18 -0400 5418 5419 Fix a broken HTML anchor and update Brazil's DST transitions; 5420 there's also a slight reordering of information in tz-art.htm. 5421 5422 5423 Release data2008f - 2008-09-09 22:33:26 -0400 5424 5425 [not summarized] 5426 5427 5428 Release 2008e - 2008-07-28 14:11:17 -0400 5429 5430 changes by Arthur David Olson and Jesper Nrgaard Welen 5431 5432 5433 Release data2008d - 2008-07-07 09:51:38 -0400 5434 5435 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 5436 5437 5438 Release data2008c - 2008-05-19 17:48:03 -0400 5439 5440 Pakistan, Morocco, and Mongolia 5441 5442 5443 Release data2008b - 2008-03-24 08:30:59 -0400 5444 5445 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 5446 link provided 5447 5448 5449 Release 2008a - 2008-03-08 05:42:16 -0500 5450 5451 [not summarized] 5452 5453 5454 Release 2007k - 2007-12-31 10:25:22 -0500 5455 5456 most importantly, changes to the "southamerica" file based on 5457 Argentina's readoption of daylight saving time 5458 5459 5460 Release 2007j - 2007-12-03 09:51:01 -0500 5461 5462 1. eliminate the "P" (parameter) macro; 5463 5464 2. the "noncontroversial" changes circulated on the time zone 5465 mailing list (less the changes to "logwtmp.c"); 5466 5467 3. eliminate "too many transition" errors when "min" is used in time 5468 zone rules; 5469 5470 4. changes by Paul Eggert (including updated information for Venezuela). 5471 5472 5473 Release data2007i - 2007-10-30 10:28:11 -0400 5474 5475 changes for Cuba and Syria 5476 5477 5478 Release 2007h - 2007-10-01 10:05:51 -0400 5479 5480 changes by Paul Eggert, as well as an updated link to the ICU 5481 project in tz-link.htm 5482 5483 5484 Release 2007g - 2007-08-20 10:47:59 -0400 5485 5486 changes by Paul Eggert 5487 5488 The "leapseconds" file has been updated to incorporate the most 5489 recent International Earth Rotation and Reference Systems Service 5490 (IERS) bulletin. 5491 5492 There's an addition to tz-art.htm regarding the television show "Medium". 5493 5494 5495 Release 2007f - 2007-05-07 10:46:46 -0400 5496 5497 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 5498 Zealand) 5499 5500 changes to zic.c to allow hour values greater than 24 (along with 5501 Paul's improved time value overflow checking) 5502 5503 5504 Release 2007e - 2007-04-02 10:11:52 -0400 5505 5506 Syria and Honduras changes by Paul Eggert 5507 5508 zic.c variable renaming changes by Arthur David Olson 5509 5510 5511 Release 2007d - 2007-03-20 08:48:30 -0400 5512 5513 changes by Paul Eggert 5514 5515 the elimination of white space at the ends of lines 5516 5517 5518 Release 2007c - 2007-02-26 09:09:37 -0500 5519 5520 changes by Paul Eggert 5521 5522 5523 Release 2007b - 2007-02-12 09:34:20 -0500 5524 5525 Paul Eggert's proposed change to the quotation handling logic in zic.c. 5526 5527 changes to the commentary in "leapseconds" reflecting the IERS 5528 announcement that there is to be no positive leap second at the end 5529 of June 2007. 5530 5531 5532 Release 2007a - 2007-01-08 12:28:29 -0500 5533 5534 changes by Paul Eggert 5535 5536 Derick Rethans's Asmara change 5537 5538 Oscar van Vlijmen's Easter Island local mean time change 5539 5540 symbolic link changes 5541 5542 5543 Release 2006p - 2006-11-27 08:54:27 -0500 5544 5545 changes by Paul Eggert 5546 5547 5548 Release 2006o - 2006-11-06 09:18:07 -0500 5549 5550 changes by Paul Eggert 5551 5552 5553 Release 2006n - 2006-10-10 11:32:06 -0400 5554 5555 changes by Paul Eggert 5556 5557 5558 Release 2006m - 2006-10-02 15:32:35 -0400 5559 5560 changes for Uruguay, Palestine, and Egypt by Paul Eggert 5561 5562 (minimalist) changes to zic.8 to clarify "until" information 5563 5564 5565 Release data2006l - 2006-09-18 12:58:11 -0400 5566 5567 Paul's best-effort work on this coming weekend's Egypt time change 5568 5569 5570 Release 2006k - 2006-08-28 12:19:09 -0400 5571 5572 changes by Paul Eggert 5573 5574 5575 Release 2006j - 2006-08-21 09:56:32 -0400 5576 5577 changes by Paul Eggert 5578 5579 5580 Release code2006i - 2006-08-07 12:30:55 -0400 5581 5582 localtime.c fixes 5583 5584 Ken Pizzini's conversion script 5585 5586 5587 Release code2006h - 2006-07-24 09:19:37 -0400 5588 5589 adds public domain notices to four files 5590 5591 includes a fix for transition times being off by a second 5592 5593 adds a new recording to the "arts" file (information courtesy Colin Bowern) 5594 5595 5596 Release 2006g - 2006-05-08 17:18:09 -0400 5597 5598 northamerica changes by Paul Eggert 5599 5600 5601 Release 2006f - 2006-05-01 11:46:00 -0400 5602 5603 a missing version number problem is fixed (with thanks to Bradley 5604 White for catching the problem) 5605 5606 5607 Release 2006d - 2006-04-17 14:33:43 -0400 5608 5609 changes by Paul Eggert 5610 5611 added new items to tz-arts.htm that were found by Paul 5612 5613 5614 Release 2006c - 2006-04-03 10:09:32 -0400 5615 5616 two sets of data changes by Paul Eggert 5617 5618 a fencepost error fix in zic.c 5619 5620 changes to zic.c and the "europe" file to minimize differences 5621 between output produced by the old 32-bit zic and the new 64-bit 5622 version 5623 5624 5625 Release 2006b - 2006-02-20 10:08:18 -0500 5626 [tz32code2006b + tz64code2006b + tzdata2006b] 5627 5628 64-bit code 5629 5630 All SCCS IDs were bumped to "8.1" for this release. 5631 5632 5633 Release 2006a - 2006-01-30 08:59:31 -0500 5634 5635 changes by Paul Eggert (in particular, Indiana time zone moves) 5636 5637 an addition to the zic manual page to describe how special-case 5638 transitions are handled 5639 5640 5641 Release 2005r - 2005-12-27 09:27:13 -0500 5642 5643 Canadian changes by Paul Eggert 5644 5645 They also add "<pre>" directives to time zone data files and reflect 5646 changes to warning message logic in "zdump.c" (but with calls to 5647 "gettext" kept unbundled at the suggestion of Ken Pizzini). 5648 5649 5650 Release 2005q - 2005-12-13 09:17:09 -0500 5651 5652 Nothing earth-shaking here: 5653 1. Electronic mail addresses have been removed. 5654 2. Casts of the return value of exit have been removed. 5655 3. Casts of the argument of is.* macros have been added. 5656 4. Indentation in one section of zic.c has been fixed. 5657 5. References to dead URLs in the data files have been dealt with. 5658 5659 5660 Release 2005p - 2005-12-05 10:30:53 -0500 5661 5662 "systemv", "tz-link.htm", and "zdump.c" changes 5663 (less the casts of arguments to the is* macros) 5664 5665 5666 Release 2005o - 2005-11-28 10:55:26 -0500 5667 5668 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 5669 5670 zdump.c lint fixes by Arthur David Olson 5671 5672 5673 Release 2005n - 2005-10-03 09:44:09 -0400 5674 5675 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 5676 et al. changes) 5677 5678 5679 Release 2005m - 2005-08-29 12:15:40 -0400 5680 5681 changes by Paul Eggert (with a small tweak to the tz-art change) 5682 5683 a declaration of an unused variable has been removed from zdump.c 5684 5685 5686 Release 2005l - 2005-08-22 12:06:39 -0400 5687 5688 changes by Paul Eggert 5689 5690 overflow/underflow checks by Arthur David Olson, minus changes to 5691 the "Theory" file about the pending addition of 64-bit data (I grow 5692 less confident of the changes being accepted with each passing day, 5693 and the changes no longer increase the data files nine-fold--there's 5694 less than a doubling in size by my local Sun's reckoning) 5695 5696 5697 Release 2005k - 2005-07-14 14:14:24 -0400 5698 5699 The "leapseconds" file has been edited to reflect the recently 5700 announced leap second at the end of 2005. 5701 5702 I've also deleted electronic mail addresses from the files as an 5703 anti-spam measure. 5704 5705 5706 Release 2005j - 2005-06-13 14:34:13 -0400 5707 5708 These reflect changes to limit the length of time zone abbreviations 5709 and the characters used in those abbreviations. 5710 5711 There are also changes to handle POSIX-style "quoted" timezone 5712 environment variables. 5713 5714 The changes were circulated on the time zone mailing list; the only 5715 change since then was the removal of a couple of minimum-length of 5716 abbreviation checks. 5717 5718 5719 Release data2005i - 2005-04-21 15:04:16 -0400 5720 5721 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 5722 5723 5724 Release 2005h - 2005-04-04 11:24:47 -0400 5725 5726 changes by Paul Eggert 5727 5728 minor changes to Makefile and zdump.c to produce more useful output 5729 when doing a "make typecheck" 5730 5731 5732 Release 2005g - 2005-03-14 10:11:21 -0500 5733 5734 changes by Paul Eggert (a change to current DST rules in Uruguay and 5735 an update to a link to time zone software) 5736 5737 5738 Release 2005f - 2005-03-01 08:45:32 -0500 5739 5740 data and documentation changes by Paul Eggert 5741 5742 5743 Release 2005e - 2005-02-10 15:59:44 -0500 5744 5745 [not summarized] 5746 5747 5748 Release code2005d - 2005-01-31 09:21:47 -0500 5749 5750 make zic complain about links to links if the -v flag is used 5751 5752 have "make public" do more code checking 5753 5754 add an include to "localtime.c" for the benefit of gcc systems 5755 5756 5757 Release 2005c - 2005-01-17 18:36:29 -0500 5758 5759 get better results when mktime runs on a system where time_t is double 5760 5761 changes to the data files (most importantly to Paraguay) 5762 5763 5764 Release 2005b - 2005-01-10 09:19:54 -0500 5765 5766 Get localtime and gmtime working on systems with exotic time_t types. 5767 5768 Update the leap second commentary in the "leapseconds" file. 5769 5770 5771 Release 2005a - 2005-01-01 13:13:44 -0500 5772 5773 [not summarized] 5774 5775 5776 Release code2004i - 2004-12-14 13:42:58 -0500 5777 5778 Deal with systems where time_t is unsigned. 5779 5780 5781 Release code2004h - 2004-12-07 11:40:18 -0500 5782 5783 64-bit-time_t changes 5784 5785 5786 Release 2004g - 2004-11-02 09:06:01 -0500 5787 5788 update to Cuba (taking effect this weekend) 5789 5790 other changes by Paul Eggert 5791 5792 correction of the spelling of Oslo 5793 5794 changed versions of difftime.c and private.h 5795 5796 5797 Release code2004f - 2004-10-21 10:25:22 -0400 5798 5799 Cope with wide-ranging tm_year values. 5800 5801 5802 Release 2004e - 2004-10-11 14:47:21 -0400 5803 5804 Brazil/Argentina/Israel changes by Paul Eggert 5805 5806 changes to tz-link.htm by Paul 5807 5808 one small fix to Makefile 5809 5810 5811 Release 2004d - 2004-09-22 08:27:29 -0400 5812 5813 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 5814 5815 5816 Release 2004c - 2004-08-11 12:06:26 -0400 5817 5818 asctime-related changes 5819 5820 (variants of) some of the documentation changes suggested by Paul Eggert 5821 5822 5823 Release 2004b - 2004-07-19 14:33:35 -0400 5824 5825 data changes by Paul Eggert - most importantly, updates for Argentina 5826 5827 5828 Release 2004a - 2004-05-27 12:00:47 -0400 5829 5830 changes by Paul Eggert 5831 5832 Handle DST transitions that occur at the end of a month in some 5833 years but at the start of the following month in other years. 5834 5835 Add a copy of the correspondence that's the basis for claims about 5836 DST in the Navajo Nation. 5837 5838 5839 Release 2003e - 2003-12-15 09:36:47 -0500 5840 5841 changes by Arthur David Olson (primarily code changes) 5842 5843 changes by Paul Eggert (primarily data changes) 5844 5845 minor changes to "Makefile" and "northamerica" (in the latter case, 5846 optimization of the "Toronto" rules) 5847 5848 5849 Release 2003d - 2003-10-06 09:34:44 -0400 5850 5851 changes by Paul Eggert 5852 5853 5854 Release 2003c - 2003-09-16 10:47:05 -0400 5855 5856 Fix bad returns in zic.c's inleap function. 5857 Thanks to Bradley White for catching the problem! 5858 5859 5860 Release 2003b - 2003-09-16 07:13:44 -0400 5861 5862 Add a "--version" option (and documentation) to the zic and zdump commands. 5863 5864 changes to overflow/underflow checking in zic 5865 5866 a localtime typo fix. 5867 5868 Update the leapseconds and tz-art.htm files. 5869 5870 5871 Release 2003a - 2003-03-24 09:30:54 -0500 5872 5873 changes by Paul Eggert 5874 5875 a few additions and modifications to the tz-art.htm file 5876 5877 5878 Release 2002d - 2002-10-15 13:12:42 -0400 5879 5880 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 5881 5882 There's also a new time zone quote in "tz-art.htm". 5883 5884 5885 Release 2002c - 2002-04-04 11:55:20 -0500 5886 5887 changes by Paul Eggert 5888 5889 Change zic.c to avoid creating symlinks to files that don't exist. 5890 5891 5892 Release 2002b - 2002-01-28 12:56:03 -0500 5893 5894 [These change notes are for Release 2002a, which was corrupted. 5895 2002b was a corrected version of 2002a.] 5896 5897 changes by Paul Eggert 5898 5899 Update the "leapseconds" file to note that there'll be no leap 5900 second at the end of June, 2002. 5901 5902 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 5903 5904 Change to "difftime.c" to avoid sizeof problems. 5905 5906 5907 Release 2001d - 2001-10-09 13:31:32 -0400 5908 5909 changes by Paul Eggert 5910 5911 5912 Release 2001c - 2001-06-05 13:59:55 -0400 5913 5914 changes by Paul Eggert and Andrew Brown 5915 5916 5917 Release 2001b - 2001-04-05 16:44:38 -0400 5918 5919 changes by Paul Eggert (modulo jnorgard's typo fix) 5920 5921 tz-art.htm has been HTMLified. 5922 5923 5924 Release 2001a - 2001-03-13 12:57:44 -0500 5925 5926 changes by Paul Eggert 5927 5928 An addition to the "leapseconds" file: comments with the text of the 5929 latest IERS leap second notice. 5930 5931 Trailing white space has been removed from data file lines, and 5932 repeated spaces in "Rule Jordan" lines in the "asia" file have been 5933 converted to tabs. 5934 5935 5936 Release 2000h - 2000-12-14 15:33:38 -0500 5937 5938 changes by Paul Eggert 5939 5940 one typo fix in the "art" file 5941 5942 With providence, this is the last update of the millennium. 5943 5944 5945 Release 2000g - 2000-10-10 11:35:22 -0400 5946 5947 changes by Paul Eggert 5948 5949 correction of John Mackin's name submitted by Robert Elz 5950 5951 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 5952 Emmy Awards broadcast. 5953 5954 5955 Release 2000f - 2000-08-10 09:31:58 -0400 5956 5957 changes by Paul Eggert 5958 5959 Added information in "tz-art.htm" on a Seinfeld reference to DST. 5960 5961 Error checking and messages in the "yearistype" script have been 5962 improved. 5963 5964 5965 Release 2000e - 2000-07-31 09:27:54 -0400 5966 5967 data changes by Paul Eggert 5968 5969 a change to the default value of the defined constant HAVE_STRERROR 5970 5971 the addition of a Dave Barry quote on DST to the tz-arts file 5972 5973 5974 Release 2000d - 2000-04-20 15:43:04 -0400 5975 5976 changes to the documentation and code of strftime for C99 conformance 5977 5978 a bug fix for date.c 5979 5980 These are based on (though modified from) changes by Paul Eggert. 5981 5982 5983 Release 2000c - 2000-03-04 10:31:43 -0500 5984 5985 changes by Paul Eggert 5986 5987 5988 Release 2000b - 2000-02-21 12:16:29 -0500 5989 5990 changes by Paul Eggert and Joseph Myers 5991 5992 modest tweaks to the tz-art.htm and tz-link.htm files 5993 5994 5995 Release 2000a - 2000-01-18 09:21:26 -0500 5996 5997 changes by Paul Eggert 5998 5999 The two hypertext documents have also been renamed. 6000 6001 6002 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 6003 6004 Paul Eggert's changes 6005 6006 additions to the "zic" manual page and the "Arts.htm" file 6007 6008 6009 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 6010 6011 [not summarized] 6012 6013 6014 Release data1999h - 1999-10-07 03:50:29 -0400 6015 6016 changes by Paul Eggert to "europe" (most importantly, fixing 6017 Lithuania and Estonia) 6018 6019 6020 Release 1999g - 1999-09-28 11:06:18 -0400 6021 6022 data changes by Paul Eggert (most importantly, the change for 6023 Lebanon that buys correctness for this coming Sunday) 6024 6025 The "code" file contains changes to "Makefile" and "checktab.awk" to 6026 allow better checking of time zone files before they are published. 6027 6028 6029 Release 1999f - 1999-09-23 09:48:14 -0400 6030 6031 changes by Arthur David Olson and Paul Eggert 6032 6033 6034 Release 1999e - 1999-08-17 15:20:54 -0400 6035 6036 changes circulated by Paul Eggert, although the change to handling 6037 of DST-specifying timezone names has been commented out for now 6038 (search for "XXX" in "localtime.c" for details). These files also 6039 do not make any changes to the start of DST in Brazil. 6040 6041 In addition to Paul's changes, there are updates to "Arts.htm" and 6042 cleanups of URLs. 6043 6044 6045 Release 1999d - 1999-03-30 11:31:07 -0500 6046 6047 changes by Paul Eggert 6048 6049 The Makefile's "make public" rule has also been changed to do a test 6050 compile of each individual time zone data file (which should help 6051 avoid problems such as the one we had with Nicosia). 6052 6053 6054 Release 1999c - 1999-03-25 09:47:47 -0500 6055 6056 changes by Paul Eggert, most importantly the change for Chile. 6057 6058 6059 Release 1999b - 1999-02-01 17:51:44 -0500 6060 6061 changes by Paul Eggert 6062 6063 code changes (suggested by Mani Varadarajan, mani at be.com) for 6064 correct handling of symbolic links when building using a relative directory 6065 6066 code changes to generate correct messages for failed links 6067 6068 updates to the URLs in Arts.htm 6069 6070 6071 Release 1999a - 1999-01-19 16:20:29 -0500 6072 6073 error message internationalizations and corrections in zic.c and 6074 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 6075 to whom thanks!) 6076 6077 6078 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 6079 6080 changes for Brazil, Chile, and Germany 6081 6082 support for use of "24:00" in the input files for the time zone compiler 6083 6084 6085 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 6086 6087 changes by Paul Eggert 6088 6089 correction to a define in the "private.h" file 6090 6091 6092 Release data1998g - 1998-08-11 03:28:35 -0000 6093 [tzdata1998g.tar.gz is missing!] 6094 6095 Lithuanian change provided by mgedmin at pub.osf.it 6096 6097 Move creation of the GMT link with Etc/GMT to "etcetera" (from 6098 "backward") to ensure that the GMT file is created even where folks 6099 don't want the "backward" links (as suggested by Paul Eggert). 6100 6101 6102 Release data1998f - 1998-07-20 13:50:00 -0000 6103 [tzdata1998f.tar.gz is missing!] 6104 6105 Update the "leapseconds" file to include the newly announced 6106 insertion at the end of 1998. 6107 6108 6109 Release code1998f - 1998-06-01 10:18:31 -0400 6110 6111 addition to localtime.c by Guy Harris 6112 6113 6114 Release 1998e - 1998-05-28 09:56:26 -0400 6115 6116 The Makefile is changed to produce zoneinfo-posix rather than 6117 zoneinfo/posix, and to produce zoneinfo-leaps rather than 6118 zoneinfo/right. 6119 6120 data changes by Paul Eggert 6121 6122 changes from Guy Harris to provide asctime_r and ctime_r 6123 6124 A usno1998 file (substantially identical to usno1997) has been added. 6125 6126 6127 Release 1998d - 1998-05-14 11:58:34 -0400 6128 6129 changes to comments (in particular, elimination of references to CIA maps). 6130 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 6131 where changes occur. 6132 6133 6134 Release 1998c - 1998-02-28 12:32:26 -0500 6135 6136 changes by Paul Eggert (save the "French correction," on which I'll 6137 wait for the dust to settle) 6138 6139 symlink changes 6140 6141 changes and additions to Arts.htm 6142 6143 6144 Release 1998b - 1998-01-17 14:31:51 -0500 6145 6146 URL cleanups and additions 6147 6148 6149 Release 1998a - 1998-01-13 12:37:35 -0500 6150 6151 changes by Paul Eggert 6152 6153 6154 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 6155 6156 changes by Paul Eggert, with minor modifications from Arthur David 6157 Olson to make the files more browser friendly 6158 6159 6160 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 6161 6162 minor changes to put "TZif" at the start of each timezone information file 6163 6164 a rule has also been added to the Makefile so you can 6165 make zones 6166 to just recompile the zone information files (rather than doing a 6167 full "make install" with its other effects). 6168 6169 6170 Release data1997i - 1997-10-07 08:45:38 -0400 6171 6172 changes to Africa by Paul Eggert 6173 6174 6175 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 6176 6177 corrections for Uruguay (and other locations) 6178 6179 Arthur David Olson's simple-minded fix allowing mktime to both 6180 correctly handle leap seconds and correctly handle tm_sec values 6181 upon which arithmetic has been performed. 6182 6183 6184 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 6185 6186 Paul Eggert's updates 6187 6188 a small change to a function prototype; 6189 6190 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 6191 include information on Around the World in Eighty Days. 6192 6193 6194 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 6195 6196 fixes to zic's error handling 6197 6198 changes inspired by the item circulated on Slovenia 6199 6200 The description of Web resources has been HTMLified for browsing 6201 convenience. 6202 6203 A new piece of tz-related music has been added to the "Music" file. 6204 6205 6206 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 6207 6208 Paul Eggert's latest suggestions 6209 6210 6211 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 6212 6213 changes to "zic.c" to correct performance of the "-s" option 6214 6215 a new file "usno1997" 6216 6217 6218 Release data1997c - 1997-03-04 09:58:18 -0500 6219 6220 changes in Israel 6221 6222 6223 Release 1997b - 1997-02-27 18:34:19 -0500 6224 6225 The data file incorporates the 1997 leap second. 6226 6227 The code file incorporates Arthur David Olson's take on the 6228 zic/multiprocessor/directory-creation situation. 6229 6230 6231 Release 1997a - 1997-01-21 09:11:10 -0500 6232 6233 Paul Eggert's Antarctica (and other changes) 6234 6235 Arthur David Olson finessed the "getopt" issue by checking against 6236 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 6237 is returned while SunOS 5.5's manual says EOF is returned). 6238 6239 6240 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 6241 6242 Paul Eggert's latest changes 6243 6244 6245 Release code1996n - 1996-12-16 09:42:02 -0500 6246 6247 link snapping fix from Bruce Evans (via Garrett Wollman) 6248 6249 6250 Release data1996m - 1996-11-24 02:37:34 -0000 6251 [tzdata1996m.tar.gz is missing!] 6252 6253 Paul Eggert's batch of changes 6254 6255 6256 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 6257 6258 No functional changes here; the files have simply been changed to 6259 make more use of ISO style dates in comments. The names of the above 6260 files now include the year in full. 6261 6262 6263 Release code96l - 1996-09-08 17:12:20 -0400 6264 6265 tzcode96k was missing a couple of pieces. 6266 6267 6268 Release 96k - 1996-09-08 16:06:22 -0400 6269 6270 the latest round of changes from Paul Eggert 6271 6272 the recent Year 2000 material 6273 6274 6275 Release code96j - 1996-07-30 13:18:53 -0400 6276 6277 Set sp->typecnt as suggested by Timothy Patrick Murphy. 6278 6279 6280 Release code96i - 1996-07-27 20:11:35 -0400 6281 6282 Paul's suggested patch for strftime %V week numbers 6283 6284 6285 Release data96i - 1996-07-01 18:13:04 -0400 6286 6287 "northamerica" and "europe" changes by Paul Eggert 6288 6289 6290 Release code96h - 1996-06-05 08:02:21 -0400 6291 6292 fix for handling transitions specified in Universal Time 6293 6294 Some "public domain" notices have also been added. 6295 6296 6297 Release code96g - 1996-05-16 14:00:26 -0400 6298 6299 fix for the simultaneous-DST-and-zone-change challenge 6300 6301 6302 Release data96h - 1996-05-09 17:40:51 -0400 6303 6304 changes by Paul Eggert 6305 6306 6307 Release code96f-data96g - 1996-05-03 03:09:59 -0000 6308 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 6309 6310 The changes get us some of the way to fixing the problems noted in Paul 6311 Eggert's letter yesterday (in addition to a few others). The approach 6312 has been to make zic a bit smarter about figuring out what time zone 6313 abbreviations apply just after the time specified in the "UNTIL" part 6314 of a zone line. Putting the smarts in zic means avoiding having 6315 transition times show up in both "Zone" lines and "Rule" lines, which 6316 in turn avoids multiple transition time entries in time zone files. 6317 (This also makes the zic input files such as "europe" a bit shorter and 6318 should ease maintenance.) 6319 6320 6321 Release data96f - 1996-04-19 19:20:03 -0000 6322 [tzdata96f.tar.gz is missing!] 6323 6324 The only changes are to the "northamerica" file; the time zone 6325 abbreviation for Denver is corrected to MST (and MDT), and the 6326 comments for Mexico have been updated. 6327 6328 6329 Release data96e - 1996-03-19 17:37:26 -0500 6330 6331 Proposals by Paul Eggert, in particular the Portugal change that 6332 comes into play at the end of this month. 6333 6334 6335 Release data96d - 1996-03-18 20:49:39 -0500 6336 6337 [not summarized] 6338 6339 6340 Release code96e - 1996-02-29 15:43:27 -0000 6341 [tzcode96e.tar.gz is missing!] 6342 6343 internationalization changes and the fix to the documentation for strftime 6344 6345 6346 Release code96d-data96c - 1996-02-12 11:05:27 -0500 6347 6348 The "code" file simply updates Bob Kridle's electronic address. 6349 6350 The "data" file updates rules for Mexico. 6351 6352 6353 Release data96b - 1996-01-27 15:44:42 -0500 6354 6355 Kiribati change 6356 6357 6358 Release code96c - 1996-01-16 16:58:15 -0500 6359 6360 leap-year streamlining and binary-search changes 6361 6362 fix to newctime.3 6363 6364 6365 Release code96b - 1996-01-10 20:42:39 -0500 6366 6367 fixes and enhancements from Paul Eggert, including code that 6368 emulates the behavior of recent versions of the SunOS "date" 6369 command. 6370 6371 6372 Release 96a - 1996-01-06 09:08:24 -0500 6373 6374 Israel updates 6375 6376 fixes to strftime.c for correct ISO 8601 week number generation, 6377 plus support for two new formats ('G' and 'g') to give ISO 8601 year 6378 numbers (which are not necessarily the same as calendar year numbers) 6379 6380 6381 Release code95i-data95m - 1995-12-21 12:46:47 -0500 6382 6383 The latest revisions from Paul Eggert are included, the usno1995 6384 file has been updated, and a new file ("WWW") covering useful URLs 6385 has been added. 6386 6387 6388 Release code95h-data95l - 1995-12-19 18:10:12 -0500 6389 6390 A simplification of a macro definition, a change to data for Sudan, 6391 and (for last minute shoppers) notes in the "Music" file on the CD 6392 "Old Man Time". 6393 6394 6395 Release code95g-data95k - 1995-10-30 10:32:47 -0500 6396 6397 (slightly reformatted) 8-bit-clean proposed patch 6398 6399 minor patch: US/Eastern -> America/New_York 6400 6401 snapshot of the USNO's latest data ("usno1995") 6402 6403 some other minor cleanups 6404 6405 6406 Release code95f-data95j - 1995-10-28 21:01:34 -0000 6407 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 6408 6409 European cleanups 6410 6411 support for 64-bit time_t's 6412 6413 optimization in localtime.c 6414 6415 6416 Release code95e - 1995-10-13 13:23:57 -0400 6417 6418 the mktime change to scan from future to past when trying to find time zone 6419 offsets 6420 6421 6422 Release data95i - 1995-09-26 10:43:26 -0400 6423 6424 For Canada/Central, guess that the Sun customer's "one week too 6425 early" was just a approximation, and the true error is one month 6426 too early. This is consistent with the rest of Canada. 6427 6428 6429 Release data95h - 1995-09-21 11:26:48 -0400 6430 6431 latest changes from Paul Eggert 6432 6433 6434 Release code95d - 1995-09-14 11:14:45 -0400 6435 6436 the addition of a "Music" file, which documents four recorded 6437 versions of the tune "Save That Time". 6438 6439 6440 Release data95g - 1995-09-01 17:21:36 -0400 6441 6442 "yearistype" correction 6443 6444 6445 Release data95f - 1995-08-28 20:46:56 -0400 6446 6447 Paul Eggert's change to the australasia file 6448 6449 6450 Release data95e - 1995-07-08 18:02:34 -0400 6451 6452 The only change is a leap second at the end of this year. 6453 Thanks to Bradley White for forwarding news on the leap second. 6454 6455 6456 Release data95d - 1995-07-03 13:26:22 -0400 6457 6458 Paul Eggert's changes 6459 6460 6461 Release data95c - 1995-07-02 19:19:28 -0400 6462 6463 changes to "asia", "backward", "europe", and "southamerica" 6464 (read: northamericacentrics need not apply) 6465 6466 6467 Release code95c - 1995-03-13 14:00:46 -0500 6468 6469 one-line fix for sign extension problems in detzcode 6470 6471 6472 Release 95b - 1995-03-04 11:22:38 -0500 6473 6474 Minor changes in both: 6475 6476 The "code" file contains a workaround for the lack of "unistd.h" in 6477 Microsoft C++ version 7. 6478 6479 The "data" file contains a fixed "Link" for America/Shiprock. 6480 6481 6482 Release 94h - 1994-12-10 12:51:14 -0500 6483 6484 The files: 6485 6486 * incorporate the changes to "zdump" and "date" to make changes to 6487 the "TZ" environment variable permanent; 6488 6489 * incorporate the table changes by Paul Eggert; 6490 6491 * include (and document) support for universal time specifications in 6492 data files - but do not (yet) include use of this feature in the 6493 data files. 6494 6495 Think of this as "TZ Classic" - the software has been set up not to break if 6496 universal time shows up in its input, and data entries have been 6497 left as is so as not to break existing implementations. 6498 6499 6500 Release data94f - 1994-08-20 12:56:09 -0400 6501 6502 (with thanks!) the latest data updates from Paul Eggert 6503 6504 6505 Release data94e - 1994-06-04 13:13:53 -0400 6506 6507 [not summarized] 6508 6509 6510 Release code94g - 1994-05-05 12:14:07 -0400 6511 6512 fix missing "optind.c" and a reference to it in the Makefile 6513 6514 6515 Release code94f - 1994-05-05 13:00:33 -0000 6516 [tzcode94f.tar.gz is missing!] 6517 6518 changes to avoid overflow in difftime, as well as changes to cope 6519 with the 52/53 challenge in strftime 6520 6521 6522 Release code94e - 1994-03-30 23:32:59 -0500 6523 6524 change for the benefit of PCTS 6525 6526 6527 Release 94d - 1994-02-24 15:42:25 -0500 6528 6529 Avoid clashes with POSIX semantics for zones such as GMT+4. 6530 6531 Some other very minor housekeeping is also present. 6532 6533 6534 Release code94c - 1994-02-10 08:52:40 -0500 6535 6536 Fix bug where mkdirs was broken unless you compile with 6537 -fwritable-strings (which is generally losing to do). 6538 6539 6540 Release 94b - 1994-02-07 10:04:33 -0500 6541 6542 work by Paul Eggert who notes: 6543 6544 I found another book of time zone histories by E W Whitman; it's not 6545 as extensive as Shanks but has a few goodies of its own. I used it 6546 to update the tables. I also fixed some more as a result of 6547 correspondence with Adam David and Peter Ilieve, and move some stray 6548 links from 'europe' to 'backward'. I corrected some scanning errors 6549 in usno1989. 6550 6551 As far as the code goes, I fixed zic to allow years in the range 6552 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 6553 And I cleaned up the zic documentation a little bit. 6554 6555 6556 Release data94a - 1994-02-03 08:58:54 -0500 6557 6558 It simply incorporates the recently announced leap second into the 6559 "leapseconds" file. 6560 6561 6562 Release 93g - 1993-11-22 17:28:27 -0500 6563 6564 Paul Eggert has provided a good deal of historic information (based 6565 on Shanks), and there are some code changes to deal with the buglets 6566 that crawled out in dealing with the new information. 6567 6568 6569 Release 93f - 1993-10-15 12:27:46 -0400 6570 6571 Paul Eggert's changes 6572 6573 6574 Release 93e - 1993-09-05 21:21:44 -0400 6575 6576 This has updated data for Israel, England, and Kwajalein. There's 6577 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 6578 Thanks to Paul Eggert and Peter Ilieve for the changes. 6579 6580 6581 Release 93d - 1993-06-17 23:34:17 -0400 6582 6583 new fix and new data on Israel 6584 6585 6586 Release 93c - 1993-06-06 19:31:55 -0400 6587 6588 [not summarized] 6589 6590 6591 Release 93b - 1993-02-02 14:53:58 -0500 6592 6593 updated "leapseconds" file 6594 6595 6596 Release 93 - 1993-01-08 07:01:06 -0500 6597 6598 At kre's suggestion, the package has been split in two - a code piece 6599 (which also includes documentation) that's only of use to folks who 6600 want to recompile things and a data piece useful to anyone who can 6601 run "zic". 6602 6603 The new version has a few changes to the data files, a few 6604 portability changes, and an off-by-one fix (with thanks to 6605 Tom Karzes at deshaw.com for providing a description and a 6606 solution). 6607 6608 6609 Release 92c - 1992-11-21 17:35:36 -0000 6610 [tz92c.tar.Z is missing!] 6611 6612 The fallout from the latest round of DST transitions. 6613 6614 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 6615 there's also a change to "zic.c" that makes it portable to more systems. 6616 6617 6618 Release 92 - 1992-04-25 18:17:03 -0000 6619 [tz92.tar.Z is missing!] 6620 6621 By popular demand (well, at any rate, following a request by kre at munnari) 6622 6623 6624 The 1989 update of the time zone package featured: 6625 6626 * POSIXization (including interpretation of POSIX-style TZ environment 6627 variables, provided by Guy Harris), 6628 * ANSIfication (including versions of "mktime" and "difftime"), 6629 * SVIDulation (an "altzone" variable) 6630 * MACHination (the "gtime" function) 6631 * corrections to some time zone data (including corrections to the rules 6632 for Great Britain and New Zealand) 6633 * reference data from the United States Naval Observatory for folks who 6634 want to do additional time zones 6635 * and the 1989 data for Saudi Arabia. 6636 6637 (Since this code will be treated as "part of the implementation" in some 6638 places and as "part of the application" in others, there's no good way to 6639 name functions, such as timegm, that are not part of the proposed ANSI C 6640 standard; such functions have kept their old, underscore-free names in this 6641 update.) 6642 6643 And the "dysize" function has disappeared; it was present to allow 6644 compilation of the "date" command on old BSD systems, and a version of "date" 6645 is now provided in the package. The "date" command is not created when you 6646 "make all" since it may lack options provided by the version distributed with 6647 your operating system, or may not interact with the system in the same way 6648 the native version does. 6649 6650 Since POSIX frowns on correct leap second handling, the default behavior of 6651 the "zic" command (in the absence of a "-L" option) has been changed to omit 6652 leap second information from its output files. 6653 6654 6655 ----- 6656 Notes 6657 6658 This file contains copies of the part of each release announcement 6659 that talks about the changes in that release. The text has been 6660 adapted and reformatted for the purposes of this file. 6661 6662 Traditionally a release R consists of a pair of tarball files, 6663 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 6664 code2010a, data2012c) consist of just one or the other tarball, and a 6665 few (e.g., code2012c-data2012d) have tarballs with mixed version 6666 numbers. Recent releases also come in an experimental format 6667 consisting of a single tarball tzdb-R.tar.lz with extra data. 6668 6669 Release timestamps are taken from the release's commit (for newer, 6670 Git-based releases), from the newest file in the tarball (for older 6671 releases, where this info is available) or from the email announcing 6672 the release (if all else fails; these are marked with a time zone 6673 abbreviation of -0000 and an "is missing!" comment). 6674 6675 Earlier versions of the code and data were not announced on the tz 6676 list and are not summarized here. 6677 6678 This file is in the public domain. 6679 6680 Local Variables: 6681 coding: utf-8 6682 End: 6683
Indexes created Tue Aug 18 00:25:06 UTC 2026