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