NEWS revision 1.37
1 News for the tz database 2 3 Release 2022c - 2022-08-15 17:47:18 -0700 4 5 Briefly: 6 Work around awk bug in FreeBSD, macOS, etc. 7 Improve tzselect on intercontinental Zones. 8 9 Changes to code 10 11 Work around a bug in onetrueawk that broke commands like 12 'make traditional_tarballs' on FreeBSD, macOS, etc. 13 (Problem reported by Deborah Goldsmith.) 14 15 Add code to tzselect that uses experimental structured comments in 16 zone1970.tab to clarify whether Zones like Africa/Abidjan and 17 Europe/Istanbul cross continent or ocean boundaries. 18 (Inspired by a problem reported by Peter Krefting.) 19 20 Fix bug with 'zic -d /a/b/c' when /a is unwritable but the 21 directory /a/b already exists. 22 23 Remove zoneinfo2tdf.pl, as it was unused and triggered false 24 malware alarms on some email servers. 25 26 27 Release 2022b - 2022-08-10 15:38:32 -0700 28 29 Briefly: 30 Chile's DST is delayed by a week in September 2022. 31 Iran no longer observes DST after 2022. 32 Rename Europe/Kiev to Europe/Kyiv. 33 New zic -R option 34 Vanguard form now uses %z. 35 Finish moving duplicate-since-1970 zones to 'backzone'. 36 New build option PACKRATLIST 37 New tailored_tarballs target, replacing rearguard_tarballs 38 39 Changes to future timestamps 40 41 Chile's 2022 DST start is delayed from September 4 to September 11. 42 (Thanks to Juan Correa.) 43 44 Iran plans to stop observing DST permanently, after it falls back 45 on 2022-09-21. (Thanks to Ali Mirjamali.) 46 47 Changes to past timestamps 48 49 Finish moving to 'backzone' the location-based zones whose 50 timestamps since 1970 are duplicates; adjust links accordingly. 51 This change ordinarily affects only pre-1970 timestamps, and with 52 the new PACKRATLIST option it does not affect any timestamps. 53 In this round the affected zones are Antarctica/Vostok, 54 Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, 55 Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, 56 Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, 57 Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, 58 Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, 59 Pacific/Wake and Pacific/Wallis, and the affected links are 60 Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, 61 Pacific/Truk, and Pacific/Yap. 62 63 From fall 1994 through fall 1995, Shanks wrote that Crimea's 64 DST transitions were at 02:00 standard time, not at 00:00. 65 (Thanks to Michael Deckers.) 66 67 Iran adopted standard time in 1935, not 1946. In 1977 it observed 68 DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 69 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 70 transition was on 05-27, not 03-21. 71 (Thanks to Roozbeh Pournader and Francis Santoni.) 72 73 Chile's observance of -04 from 1946-08-29 through 1947-03-31 was 74 considered DST, not standard time. Santiago and environs had moved 75 their clocks back to rejoin the rest of mainland Chile; put this 76 change at the end of 1946-08-28. (Thanks to Michael Deckers.) 77 78 Some old, small clock transitions have been removed, as people at 79 the time did not change their clocks. This affects Asia/Hong_Kong 80 in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. 81 82 Changes to zone name 83 84 Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in 85 English now. Spelling of other names in Ukraine has not yet 86 demonstrably changed in common English practice so for now these 87 names retain old spellings, as in other countries (e.g., 88 Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). 89 90 Changes to code 91 92 zic has a new option '-R @N' to output explicit transitions < N. 93 (Need suggested by Almaz Mingaleev.) 94 95 'zic -r @N' no longer outputs bad data when N < first transition. 96 (Problem introduced in 2021d and reported by Peter Krefting.) 97 98 zic now checks its input for NUL bytes and unterminated lines, and 99 now supports input line lengths up to 2048 (not 512) bytes. 100 101 gmtime and related code now use the abbreviation "UTC" not "GMT". 102 POSIX is being revised to require this. 103 104 When tzset and related functions set vestigial static variables 105 like tzname, they now prefer specified timestamps to unspecified ones. 106 (Problem reported by Almaz Mingaleev.) 107 108 zic no longer complains "can't determine time zone abbreviation to 109 use just after until time" when a transition to a new standard 110 time occurs simultaneously with the first DST fallback transition. 111 112 Changes to build procedure 113 114 Source data in vanguard form now uses the %z notation, introduced 115 in release 2015f. For example, for America/Sao_Paulo vanguard 116 form contains the zone continuation line "-3:00 Brazil %z", which 117 is simpler and more reliable than the line "-3:00 Brazil -03/-02" 118 used in main and rearguard forms. The plan is for the main form 119 to use %z eventually; in the meantime maintainers of zi parsers 120 are encouraged to test the parsers on vanguard.zi. 121 122 The Makefile has a new PACKRATLIST option to select a subset of 123 'backzone'. For example, 'make PACKRATDATA=backzone 124 PACKRATLIST=zone.tab' now generates TZif files identical to those 125 of the global-tz project. 126 127 The Makefile has a new tailored_tarballs target for generating 128 special-purpose tarballs. It generalizes and replaces the 129 rearguard_tarballs target and related targets and macros, which 130 are now obsolescent. 131 132 'make install' now defaults LOCALTIME to Factory not GMT, 133 which means the default abbreviation is now "-00" not "GMT". 134 135 Remove the posix_packrat target, marked obsolescent in 2016a. 136 137 138 Release 2022a - 2022-03-15 23:02:01 -0700 139 140 Briefly: 141 Palestine will spring forward on 2022-03-27, not -03-26. 142 zdump -v now outputs better failure indications. 143 Bug fixes for code that reads corrupted TZif data. 144 145 Changes to future timestamps 146 147 Palestine will spring forward on 2022-03-27, not 2022-03-26. 148 (Thanks to Heba Hamad.) Predict future transitions for first 149 Sunday >= March 25. Additionally, predict fallbacks to be the first 150 Friday on or after October 23, not October's last Friday, to be more 151 consistent with recent practice. The first differing fallback 152 prediction is on 2025-10-24, not 2025-10-31. 153 154 Changes to past timestamps 155 156 From 1992 through spring 1996, Ukraine's DST transitions were at 157 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) 158 159 Chile's Santiago Mean Time and its LMT precursor have been adjusted 160 eastward by 1 second to align with past and present law. 161 162 Changes to commentary 163 164 Add several references for Chile's 1946/1947 transitions, some of 165 which only affected portions of the country. 166 167 Changes to code 168 169 Fix bug when mktime gets confused by truncated TZif files with 170 unspecified local time. (Problem reported by Almaz Mingaleev.) 171 172 Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. 173 (Problem reported by Christos Zoulas.) 174 175 When reading a version 2 or later TZif file, the TZif reader now 176 validates the version 1 header and data block only enough to skip 177 over them, as recommended by RFC 8536 section 4. Also, the TZif 178 reader no longer mistakenly attempts to parse a version 1 TZIf 179 file header as a TZ string. 180 181 zdump -v now outputs "(localtime failed)" and "(gmtime failed)" 182 when local time and UT cannot be determined for a timestamp. 183 184 Changes to build procedure 185 186 Distribution tarballs now use standard POSIX.1-1988 ustar format 187 instead of GNU format. Although the formats are almost identical 188 for these tarballs, ustar headers' magic fields contain "ustar" 189 instead of "ustar ", and their version fields contain "00" instead 190 of " ". The two formats are planned to diverge more significantly 191 for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar 192 format becomes obsolete and the tarballs switch to pax format, an 193 extension of ustar. For details about these formats, please see 194 "pax - portable archive interchange", IEEE Std 1003.1-2017, 195 <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>. 196 197 198 Release 2021e - 2021-10-21 18:41:00 -0700 199 200 Changes to future timestamps 201 202 Palestine will fall back 10-29 (not 10-30) at 01:00. 203 (Thanks to P Chan and Heba Hemad.) 204 205 206 Release 2021d - 2021-10-15 13:48:18 -0700 207 208 Briefly: 209 Fiji suspends DST for the 2021/2022 season. 210 'zic -r' marks unspecified timestamps with "-00". 211 212 Changes to future timestamps 213 214 Fiji will suspend observance of DST for the 2021/2022 season. 215 Assume for now that it will return next year. (Thanks to Jashneel 216 Kumar and P Chan.) 217 218 Changes to code 219 220 'zic -r' now uses "-00" time zone abbreviations for intervals 221 with UT offsets that are unspecified due to -r truncation. 222 This implements a change in draft Internet RFC 8536bis. 223 224 225 Release 2021c - 2021-10-01 14:21:49 -0700 226 227 Briefly: 228 Revert most 2021b changes to 'backward'. 229 Fix 'zic -b fat' bug in pre-1970 32-bit data. 230 Fix two Link line typos. 231 Distribute SECURITY file. 232 233 This release is intended as a bugfix release, to fix compatibility 234 problems and typos reported since 2021b was released. 235 236 Changes to Link directives 237 238 Revert almost all of 2021b's changes to the 'backward' file, 239 by moving Link directives back to where they were in 2021a. 240 Although 'zic' doesn't care which source file contains a Link 241 directive, some downstream uses ran into trouble with the move. 242 (Problem reported by Stephen Colebourne for Joda-Time.) 243 244 Fix typo that linked Atlantic/Jan_Mayen to the wrong location 245 (problem reported by Chris Walton). 246 247 Fix 'backzone' typo that linked America/Virgin to the wrong 248 location (problem reported by Michael Deckers). 249 250 Changes to code 251 252 Fix a bug in 'zic -b fat' that caused old timestamps to be 253 mishandled in 32-bit-only readers (problem reported by Daniel 254 Fischer). 255 256 Changes to documentation 257 258 Distribute the SECURITY file (problem reported by Andreas Radke). 259 260 261 Release 2021b - 2021-09-24 16:23:00 -0700 262 263 Briefly: 264 Jordan now starts DST on February's last Thursday. 265 Samoa no longer observes DST. 266 Merge more location-based Zones whose timestamps agree since 1970. 267 Move some backward-compatibility links to 'backward'. 268 Rename Pacific/Enderbury to Pacific/Kanton. 269 Correct many pre-1993 transitions in Malawi, Portugal, etc. 270 zic now creates each output file or link atomically. 271 zic -L no longer omits the POSIX TZ string in its output. 272 zic fixes for truncation and leap second table expiration. 273 zic now follows POSIX for TZ strings using all-year DST. 274 Fix some localtime crashes and bugs in obscure cases. 275 zdump -v now outputs more-useful boundary cases. 276 tzfile.5 better matches a draft successor to RFC 8536. 277 A new file SECURITY. 278 279 This release is prompted by recent announcements by Jordan and Samoa. 280 It incorporates many other changes that had accumulated since 2021a. 281 However, it omits most proposed changes that merged all Zones 282 agreeing since 1970, as concerns were raised about doing too many of 283 these changes at once. It does keeps some of these changes in the 284 interest of making tzdb more equitable one step at a time; see 285 "Merge more location-based Zones" below. 286 287 Changes to future timestamps 288 289 Jordan now starts DST on February's last Thursday. 290 (Thanks to Steffen Thorsen.) 291 292 Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) 293 294 Changes to zone name 295 296 Rename Pacific/Enderbury to Pacific/Kanton. When we added 297 Enderbury in 1993, we did not know that it is uninhabited and that 298 Kanton (population two dozen) is the only inhabited location in 299 that timezone. The old name is now a backward-compatibility link. 300 301 Changes to past timestamps 302 303 Correct many pre-1993 transitions, fixing entries originally 304 derived from Shanks, Whitman, and Mundell. The fixes include: 305 - Barbados: standard time was introduced in 1911, not 1932; and 306 DST was observed in 1942-1944 307 - Cook Islands: In 1899 they switched from east to west of GMT, 308 celebrating Christmas for two days. They (and Niue) switched 309 to standard time in 1952, not 1901. 310 - Guyana: corrected LMT for Georgetown; the introduction of 311 standard time in 1911, not 1915; and corrections to 1975 and 312 1992 transitions 313 - Kanton: uninhabited before 1937-08-31 314 - Niue: only observed -11:20 from 1952 through 1964, then went to 315 -11 instead of -11:30 316 - Portugal: DST was observed in 1950 317 - Tonga: corrected LMT; the introduction of standard time in 1945, 318 not 1901; and corrections to the transition from +12:20 to +13 319 in 1961, not 1941 320 Additional fixes to entries in the 'backzone' file include: 321 - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 322 - The Gambia: 1933 and 1942 transitions 323 - Malawi: several 1911 through 1925 transitions 324 - Sierra Leone: several 1913 through 1941 transitions, and DST 325 was NOT observed in 1957 through 1962 326 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and 327 Alois Treindl.) 328 329 Merge more location-based Zones whose timestamps agree since 1970, 330 as pre-1970 timestamps are out of scope. This is part of a 331 process that has been ongoing since 2013. This does not affect 332 post-1970 timestamps, and timezone historians who build with 'make 333 PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. 334 When merging, keep the most-populous location's data, and move 335 data for other locations to 'backzone' with a backward 336 link in 'backward'. For example, move America/Creston data to 337 'backzone' with a link in 'backward' from America/Phoenix because 338 the two timezones' timestamps agree since 1970; this change 339 affects some pre-1968 timestamps in America/Creston because 340 Creston and Phoenix disagreed before 1968. The affected Zones 341 are Africa/Accra, America/Atikokan, America/Blanc-Sablon, 342 America/Creston, America/Curacao, America/Nassau, 343 America/Port_of_Spain, Antarctica/DumontDUrville, and 344 Antarctica/Syowa. 345 346 Changes to maintenance procedure 347 348 The new file SECURITY covers how to report security-related bugs. 349 350 Several backward-compatibility links have been moved to the 351 'backward' file. These links, which range from Africa/Addis_Ababa 352 to Pacific/Saipan, are only for compatibility with now-obsolete 353 guidelines suggesting an entry for every ISO 3166 code. 354 The intercontinental convenience links Asia/Istanbul and 355 Europe/Nicosia have also been moved to 'backward'. 356 357 Changes to code 358 359 zic now creates each output file or link atomically, 360 possibly by creating a temporary file and then renaming it. 361 This avoids races where a TZ setting would temporarily stop 362 working while zic was installing a replacement file or link. 363 364 zic -L no longer omits the POSIX TZ string in its output. 365 Starting with 2020a, zic -L truncated its output according to the 366 "Expires" directive or "#expires" comment in the leapseconds file. 367 The resulting TZif files omitted daylight saving transitions after 368 the leap second table expired, which led to far less-accurate 369 predictions of times after the expiry. Although future timestamps 370 cannot be converted accurately in the presence of leap seconds, it 371 is more accurate to convert near-future timestamps with a few 372 seconds error than with an hour error, so zic -L no longer 373 truncates output in this way. 374 375 Instead, when zic -L is given the "Expires" directive, it now 376 outputs the expiration by appending a no-change entry to the leap 377 second table. Although this should work well with most TZif 378 readers, it does not conform to Internet RFC 8536 and some pickier 379 clients (including tzdb 2017c through 2021a) reject it, so 380 "Expires" directives are currently disabled by default. To enable 381 them, set the EXPIRES_LINE Makefile variable. If a TZif file uses 382 this new feature it is marked with a new TZif version number 4, 383 a format intended to be documented in a successor to RFC 8536. 384 385 zic -L LEAPFILE -r @LO no longer generates an invalid TZif file 386 that omits leap second information for the range LO..B when LO 387 falls between two leap seconds A and B. Instead, it generates a 388 TZif version 4 file that represents the previously-missing 389 information. 390 391 The TZif reader now allows the leap second table to begin with a 392 correction other than -1 or +1, and to contain adjacent 393 transitions with equal corrections. This supports TZif version 4. 394 395 The TZif reader now lets leap seconds occur less than 28 days 396 apart. This supports possible future TZif extensions. 397 398 Fix bug that caused 'localtime' etc. to crash when TZ was 399 set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does 400 not conform to POSIX but does conform to Internet RFC 8536. 401 402 Fix another bug that caused 'localtime' etc. to crash when TZ was 403 set to a POSIX-conforming but unusual TZ string like 404 "EST5EDT4,0/0,J365/0", where almost all the year is DST. 405 406 Fix yet another bug that caused 'localtime' etc. to mishandle slim 407 TZif files containing leap seconds after the last explicit 408 transition in the table, or when handling far-future timestamps 409 in slim TZif files lacking leap seconds. 410 411 Fix localtime misbehavior involving positive leap seconds. 412 This change affects only behavior for "right" system time, 413 which contains leap seconds, and only if the UT offset is 414 not a multiple of 60 seconds when a positive leap second occurs. 415 (No such timezone exists in tzdb, luckily.) Without the fix, 416 the timestamp was ambiguous during a positive leap second. 417 With the fix, any seconds occurring after a positive leap second 418 and within the same localtime minute are counted through 60, not 419 through 59; their UT offset (tm_gmtoff) is the same as before. 420 Here is how the fix affects timestamps in a timezone with UT 421 offset +01:23:45 (5025 seconds) and with a positive leap second at 422 1972-06-30 23:59:60 UTC (78796800): 423 424 time_t without the fix with the fix 425 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 426 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 427 ... 428 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 429 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 430 431 Fix an unlikely bug that caused 'localtime' etc. to misbehave if 432 civil time changes a few seconds before time_t wraps around, when 433 leap seconds are enabled. 434 435 Fix bug in zic -r; in some cases, the dummy time type after the 436 last time transition disagreed with the TZ string, contrary to 437 Internet RFC 8563 section 3.3. 438 439 Fix a bug with 'zic -r @X' when X is a negative leap second that 440 has a nonnegative correction. Without the fix, the output file 441 was truncated so that X appeared to be a positive leap second. 442 Fix a similar, even-less-likely bug when truncating at a positive 443 leap second that has a nonpositive correction. 444 445 zic -r now reports an error if given rolling leap seconds, as this 446 usage has never generally worked and is evidently unused. 447 448 zic now generates a POSIX-conforming TZ string for TZif files 449 where all-year DST is predicted for the indefinite future. 450 For example, for all-year Eastern Daylight Time, zic now generates 451 "XXX3EDT4,0/0,J365/23" where it previously generated 452 "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for 453 noting the possibility of POSIX conformance.) 454 455 zic.c no longer requires sys/wait.h (thanks to spazmodius for 456 noting it wasn't needed). 457 458 When reading slim TZif files, zdump no longer mishandles leap 459 seconds on the rare platforms where time_t counts leap seconds, 460 fixing a bug introduced in 2014g. 461 462 zdump -v now outputs timestamps at boundaries of what localtime 463 and gmtime can represent, instead of the less-useful timestamps 464 one day after the minimum and one day before the maximum. 465 (Thanks to Arthur David Olson for prototype code, and to Manuela 466 Friedrich for debugging help.) 467 468 zdump's -c and -t options are now consistently inclusive for the 469 lower time bound and exclusive for the upper. Formerly they were 470 inconsistent. (Confusion noted by Martin Burnicki.) 471 472 Changes to build procedure 473 474 You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to 475 non-POSIX hosts where malloc doesn't set errno. 476 (Problem reported by Jan Engelhardt.) 477 478 Changes to documentation 479 480 tzfile.5 better matches a draft successor to RFC 8536 481 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>. 482 483 484 Release 2021a - 2021-01-24 10:54:57 -0800 485 486 Changes to future timestamps 487 488 South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. 489 (Thanks to Steffen Thorsen.) 490 491 492 Release 2020f - 2020-12-29 00:17:46 -0800 493 494 Change to build procedure 495 496 'make rearguard_tarballs' no longer generates a bad rearguard.zi, 497 fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) 498 499 500 Release 2020e - 2020-12-22 15:14:34 -0800 501 502 Briefly: 503 Volgograd switches to Moscow time on 2020-12-27 at 02:00. 504 505 Changes to future timestamps 506 507 Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. 508 (Thanks to Alexander Krivenyshev and Stepan Golosunov.) 509 510 Changes to past timestamps 511 512 Correct many pre-1986 transitions, fixing entries originally 513 derived from Shanks. The fixes include: 514 - Australia: several 1917 through 1971 transitions 515 - The Bahamas: several 1941 through 1945 transitions 516 - Bermuda: several 1917 through 1956 transitions 517 - Belize: several 1942 through 1968 transitions 518 - Ghana: several 1915 through 1956 transitions 519 - Israel and Palestine: several 1940 through 1985 transitions 520 - Kenya and adjacent: several 1908 through 1960 transitions 521 - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 522 through 1919 transitions 523 - Seychelles: the introduction of standard time in 1907, not 1906 524 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition 525 (Thanks to P Chan.) 526 527 Because of the Australia change, Australia/Currie (King Island) is 528 no longer needed, as it is identical to Australia/Hobart for all 529 timestamps since 1970 and was therefore created by mistake. 530 Australia/Currie has been moved to the 'backward' file and its 531 corrected data moved to the 'backzone' file. 532 533 Changes to past time zone abbreviations and DST flags 534 535 To better match legislation in Turks and Caicos, the 2015 shift to 536 year-round observance of -04 is now modeled as AST throughout before 537 returning to Eastern Time with US DST in 2018, rather than as 538 maintaining EDT until 2015-11-01. (Thanks to P Chan.) 539 540 Changes to documentation 541 542 The zic man page now documents zic's coalescing of transitions 543 when a zone falls back just before DST springs forward. 544 545 546 Release 2020d - 2020-10-21 11:24:13 -0700 547 548 Briefly: 549 Palestine ends DST earlier than predicted, on 2020-10-24. 550 551 Changes to past and future timestamps 552 553 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 554 as previously predicted (thanks to Sharef Mustafa.) Its 555 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen 556 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and 557 its spring 2020 transition was on March 28 at 00:00, not March 27 558 (thanks to Pierre Cashon.) This affects Asia/Gaza and 559 Asia/Hebron. Assume future spring and fall transitions will be on 560 the Saturday preceding the last Sunday of March and October, 561 respectively. 562 563 564 Release 2020c - 2020-10-16 11:15:53 -0700 565 566 Briefly: 567 Fiji starts DST later than usual, on 2020-12-20. 568 569 Changes to future timestamps 570 571 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as 572 previously predicted. DST will still end on 2021-01-17. 573 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that 574 the later-than-usual start date is a one-time departure from the 575 recent pattern. 576 577 Changes to build procedure 578 579 Rearguard tarballs now contain an empty file pacificnew. 580 Some older downstream software expects this file to exist. 581 (Problem reported by Mike Cullinan.) 582 583 584 Release 2020b - 2020-10-06 18:35:04 -0700 585 586 Briefly: 587 Revised predictions for Morocco's changes starting in 2023. 588 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. 589 Macquarie Island has stayed in sync with Tasmania since 2011. 590 Casey, Antarctica is at +08 in winter and +11 in summer. 591 zic no longer supports -y, nor the TYPE field of Rules. 592 593 Changes to future timestamps 594 595 Morocco's spring-forward after Ramadan is now predicted to occur 596 no sooner than two days after Ramadan, instead of one day. 597 (Thanks to Milamber.) The first altered prediction is for 2023, 598 now predicted to spring-forward on April 30 instead of April 23. 599 600 Changes to past and future timestamps 601 602 Casey Station, Antarctica has been using +08 in winter and +11 in 603 summer since 2018. The most recent transition from +08 to +11 was 604 2020-10-04 00:01. Also, Macquarie Island has been staying in 605 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) 606 607 Changes to past and future time zone abbreviations and DST flags 608 609 Canada's Yukon, represented by America/Whitehorse and 610 America/Dawson, changes its time zone rules from -08/-07 to 611 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. 612 This change affects only the time zone abbreviation (MST vs PDT) 613 and daylight saving flag for the period between the two dates. 614 (Thanks to Andrew G. Smith.) 615 616 Changes to past timestamps 617 618 Correct several transitions for Hungary for 1918/1983. 619 For example, the 1983-09-25 fall-back was at 01:00, not 03:00. 620 (Thanks to Gza Nyry.) Also, the 1890 transition to standard 621 time was on 11-01, not 10-01 (thanks to Michael Deckers). 622 623 The 1891 French transition was on March 16, not March 15. The 624 1911-03-11 French transition was at midnight, not a minute later. 625 Monaco's transitions were on 1892-06-01 and 1911-03-29, not 626 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) 627 628 Changes to code 629 630 Support for zic's long-obsolete '-y YEARISTYPE' option has been 631 removed and, with it, so has support for the TYPE field in Rule 632 lines, which is now reserved for compatibility with earlier zic. 633 These features were previously deprecated in release 2015f. 634 (Thanks to Tim Parenti.) 635 636 zic now defaults to '-b slim' instead of to '-b fat'. 637 638 zic's new '-l -' and '-p -' options uninstall any existing 639 localtime and posixrules files, respectively. 640 641 The undocumented and ineffective tzsetwall function has been 642 removed. 643 644 Changes to build procedure 645 646 The Makefile now defaults POSIXRULES to '-', so the posixrules 647 feature (obsolete as of 2019b) is no longer installed by default. 648 649 Changes to documentation and commentary 650 651 The long-obsolete files pacificnew, systemv, and yearistype.sh have 652 been removed from the distribution. (Thanks to Tim Parenti.) 653 654 655 Release 2020a - 2020-04-23 16:03:47 -0700 656 657 Briefly: 658 Morocco springs forward on 2020-05-31, not 2020-05-24. 659 Canada's Yukon advanced to -07 year-round on 2020-03-08. 660 America/Nuuk renamed from America/Godthab. 661 zic now supports expiration dates for leap second lists. 662 663 Changes to future timestamps 664 665 Morocco's second spring-forward transition in 2020 will be May 31, 666 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) 667 Adjust future-year predictions to use the first Sunday after the 668 day after Ramadan, not the first Sunday after Ramadan. 669 670 Canada's Yukon, represented by America/Whitehorse and 671 America/Dawson, advanced to -07 year-round, beginning with its 672 spring-forward transition on 2020-03-08, and will not fall back on 673 2020-11-01. Although a government press release calls this 674 "permanent Pacific Daylight Saving Time", we prefer MST for 675 consistency with nearby Dawson Creek, Creston, and Fort Nelson. 676 (Thanks to Tim Parenti.) 677 678 Changes to past timestamps 679 680 Shanghai observed DST in 1919. (Thanks to Phake Nick.) 681 682 Changes to timezone identifiers 683 684 To reflect current usage in English better, America/Godthab has 685 been renamed to America/Nuuk. A backwards-compatibility link 686 remains for the old name. 687 688 Changes to code 689 690 localtime.c no longer mishandles timestamps after the last 691 transition in a TZif file with leap seconds and with daylight 692 saving time transitions projected into the indefinite future. 693 For example, with TZ='America/Los_Angeles' with leap seconds, 694 zdump formerly reported a DST transition on 2038-03-14 695 from 01:59:32.999... to 02:59:33 instead of the correct transition 696 from 01:59:59.999... to 03:00:00. 697 698 zic -L now supports an Expires line in the leapseconds file, and 699 truncates the TZif output accordingly. This propagates leap 700 second expiration information into the TZif file, and avoids the 701 abovementioned localtime.c bug as well as similar bugs present in 702 many client implementations. If no Expires line is present, zic 703 -L instead truncates the TZif output based on the #expires comment 704 present in leapseconds files distributed by tzdb 2018f and later; 705 however, this usage is obsolescent. For now, the distributed 706 leapseconds file has an Expires line that is commented out, so 707 that the file can be fed to older versions of zic which ignore the 708 commented-out line. Future tzdb distributions are planned to 709 contain a leapseconds file with an Expires line. 710 711 The configuration macros HAVE_TZNAME and USG_COMPAT should now be 712 set to 1 if the system library supports the feature, and 2 if not. 713 As before, these macros are nonzero if tzcode should support the 714 feature, zero otherwise. 715 716 The configuration macro ALTZONE now has the same values with the 717 same meaning as HAVE_TZNAME and USG_COMPAT. 718 719 The code's defense against CRLF in leap-seconds.list is now 720 portable to POSIX awk. (Problem reported by Deborah Goldsmith.) 721 722 Although the undocumented tzsetwall function is not changed in 723 this release, it is now deprecated in preparation for removal in 724 future releases. Due to POSIX requirements, tzsetwall has not 725 worked for some time. Any code that uses it should instead use 726 tzalloc(NULL) or, if portability trumps thread-safety, should 727 unset the TZ environment variable. 728 729 Changes to commentary 730 731 The les-de-la-Madeleine and the Listuguj reserve are noted as 732 following America/Halifax, and comments about Yukon's "south" and 733 "north" have been corrected to say "east" and "west". (Thanks to 734 Jeffery Nichols.) 735 736 737 Release 2019c - 2019-09-11 08:59:48 -0700 738 739 Briefly: 740 Fiji observes DST from 2019-11-10 to 2020-01-12. 741 Norfolk Island starts observing Australian-style DST. 742 743 Changes to future timestamps 744 745 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 746 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) 747 Adjust future guesses accordingly. 748 749 Norfolk Island will observe Australian-style DST starting in 750 spring 2019. The first transition is on 2019-10-06. (Thanks to 751 Kyle Czech and Michael Deckers.) 752 753 Changes to past timestamps 754 755 Many corrections to time in Turkey from 1940 through 1985. 756 (Thanks to Oya Vula via Alois Treindl, and to Kvan Yazan.) 757 758 The Norfolk Island 1975-03-02 transition was at 02:00 standard 759 time, not 02:00 DST. (Thanks to Michael Deckers.) 760 761 South Korea observed DST from 1948 through 1951. Although this 762 info was supposed to appear in release 2014j, a typo inadvertently 763 suppressed the change. (Thanks to Alois Treindl.) 764 765 Detroit observed DST in 1967 and 1968 following the US DST rules, 766 except that its 1967 DST began on June 14 at 00:01. (Thanks to 767 Alois Treindl for pointing out that the old data entries were 768 probably wrong.) 769 770 Fix several errors in pre-1970 transitions in Perry County, IN. 771 (Thanks to Alois Treindl for pointing out the 1967/9 errors.) 772 773 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver 774 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 775 10-06. In 1945 Knigsberg (now Kaliningrad) switched from +01/+02 776 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated 777 EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 778 Knigsberg switched to +03 on 04-07 not 01-01. 779 780 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 781 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) 782 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. 783 784 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. 785 (Thanks to Michael Deckers.) 786 787 Changes to past time zone abbreviations and DST flags 788 789 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, 790 is now flagged as DST and is abbreviated HKWT not HKT. 791 792 Changes to code 793 794 leapseconds.awk now relies only on its input data, rather than 795 also relying on its comments. (Inspired by code from Dennis 796 Ferguson and Chris Woodbury.) 797 798 The code now defends against CRLFs in leap-seconds.list. 799 (Thanks to Brian Inglis and Chris Woodbury.) 800 801 Changes to documentation and commentary 802 803 theory.html discusses leap seconds. (Thanks to Steve Summit.) 804 805 Nashville's newspapers dueled about the time of day in the 1950s. 806 (Thanks to John Seigenthaler.) 807 808 Liechtenstein observed Swiss DST in 1941/2. 809 (Thanks to Alois Treindl.) 810 811 812 Release 2019b - 2019-07-01 00:09:53 -0700 813 814 Briefly: 815 Brazil no longer observes DST. 816 'zic -b slim' outputs smaller TZif files; please try it out. 817 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 818 819 Changes to future timestamps 820 821 Brazil has canceled DST and will stay on standard time indefinitely. 822 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 823 Oliveira.) 824 825 Predictions for Morocco now go through 2087 instead of 2037, to 826 work around a problem on newlib when using TZif files output by 827 zic 2019a or earlier. (Problem reported by David Gauchard.) 828 829 Changes to past and future timestamps 830 831 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 832 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 833 future transitions to be March's last Friday at 00:00. 834 835 Changes to past timestamps 836 837 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 838 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 839 not 09-15 at 00:00. In 1946 its spring-forward transition was on 840 04-21 at 00:00, not the previous day at 03:30. From 1946 through 841 1952 its fall-back transitions occurred at 04:30, not at 03:30. 842 In 1947 its fall-back transition was on 11-30, not 12-30. 843 (Thanks to P Chan.) 844 845 Changes to past time zone abbreviations 846 847 Italy's 1866 transition to Rome Mean Time was on December 12, not 848 September 22. This affects only the time zone abbreviation for 849 Europe/Rome between those dates. (Thanks to Stephen Trainor and 850 Luigi Rosa.) 851 852 Changes affecting metadata only 853 854 Add info about the Crimea situation in zone1970.tab and zone.tab. 855 (Problem reported by Serhii Demediuk.) 856 857 Changes to code 858 859 zic's new -b option supports a way to control data bloat and to 860 test for year-2038 bugs in software that reads TZif files. 861 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 862 for example, changing from fat to slim shrinks the Europe/London 863 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 864 files represent the same set of timestamps and use the same TZif 865 format as documented in tzfile(5) and in Internet RFC 8536. 866 Fat format attempts to work around bugs or incompatibilities in 867 older software, notably software that mishandles 64-bit TZif data 868 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 869 Slim format is more efficient and does not work around 64-bit bugs 870 or obsolete TZ strings. Currently zic defaults to fat format 871 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 872 out-of-the-box default is intended to change in future releases 873 as the buggy software often mishandles timestamps anyway. 874 875 zic no longer treats a set of rules ending in 2037 specially. 876 Previously, zic assumed that such a ruleset meant that future 877 timestamps could not be predicted, and therefore omitted a 878 POSIX-like TZ string in the TZif output. The old behavior is no 879 longer needed for current tzdata, and caused problems with newlib 880 when used with older tzdata (reported by David Gauchard). 881 882 zic no longer generates some artifact transitions. For example, 883 Europe/London no longer has a no-op transition in January 1996. 884 885 Changes to build procedure 886 887 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 888 by a percent or so. 889 890 Changes to documentation and commentary 891 892 The Makefile now documents the POSIXRULES macro as being obsolete, 893 and similarly, zic's -p POSIXRULES option is now documented as 894 being obsolete. Although the POSIXRULES feature still exists and 895 works as before, in practice it is rarely used for its intended 896 purpose, and it does not work either in the default reference 897 implementation (for timestamps after 2037) or in common 898 implementations such as GNU/Linux (for contemporary timestamps). 899 Since POSIXRULES was designed primarily as a temporary transition 900 facility for System V platforms that died off decades ago, it is 901 being decommissioned rather than institutionalized. 902 903 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 904 905 906 Release 2019a - 2019-03-25 22:01:33 -0700 907 908 Briefly: 909 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 910 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 911 912 Changes to past and future timestamps 913 914 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 915 previously predicted. Adjust our prediction by guessing that spring 916 transitions will be between 24 and 30 March, which matches recent practice 917 since 2016. (Thanks to Even Scharning and Tim Parenti.) 918 919 Metlakatla ended its observance of Pacific standard time, 920 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 921 Stanley and Tim Parenti.) 922 923 Changes to past timestamps 924 925 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 926 (Thanks to Alois Treindl and Isaac Starkman.) 927 928 Changes to time zone abbreviations 929 930 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 931 of being a separate zone that generates the abbreviation "UCT", 932 which nowadays is typically a typo. (Problem reported by Isiah 933 Meadows.) 934 935 Changes to code 936 937 zic now has an -r option to limit the time range of output data. 938 For example, 'zic -r @1000000000' limits the output data to 939 timestamps starting 1000000000 seconds after the Epoch. 940 This helps shrink output size and can be useful for applications 941 not needing the full timestamp history, such as TZDIST truncation; 942 see Internet RFC 8536 section 5.1. (Inspired by a feature request 943 from Christopher Wong, helped along by bug reports from Wong and 944 from Tim Parenti.) 945 946 Changes to documentation 947 948 Mention Internet RFC 8536 (February 2019), which documents TZif. 949 950 tz-link.html now cites tzdata-meta 951 <https://tzdata-meta.timtimeonline.com/>. 952 953 954 Release 2018i - 2018-12-30 11:05:43 -0800 955 956 Briefly: 957 So Tom and Prncipe switches from +01 to +00 on 2019-01-01. 958 959 Changes to future timestamps 960 961 Due to a change in government, So Tom and Prncipe switches back 962 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 963 Nasardinov and Michael Deckers.) 964 965 966 Release 2018h - 2018-12-23 17:59:32 -0800 967 968 Briefly: 969 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 970 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 971 Metlakatla, Alaska observes PST this winter only. 972 Guess Morocco will continue to adjust clocks around Ramadan. 973 Add predictions for Iran from 2038 through 2090. 974 975 Changes to future timestamps 976 977 Guess that Morocco will continue to fall back just before and 978 spring forward just after Ramadan, the practice since 2012. 979 (Thanks to Maamar Abdelkader.) This means Morocco will observe 980 negative DST during Ramadan in main and vanguard formats, and in 981 rearguard format it stays in the +00 timezone and observes 982 ordinary DST in all months other than Ramadan. As before, extend 983 this guesswork to the year 2037. As a consequence, Morocco is 984 scheduled to observe three DST transitions in some Gregorian years 985 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 986 calendars. 987 988 The table of exact transitions for Iranian DST has been extended. 989 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 990 It now cuts off before 2091 as there is doubt about how the Persian 991 calendar will treat 2091. This change predicts DST transitions in 992 2038-9, 2042-3, and 2046-7 to occur one day later than previously 993 predicted. As before, post-cutoff transitions are approximated. 994 995 Changes to past and future timestamps 996 997 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 998 +05 on 2018-12-21. This is a zone split as Qostanay (aka 999 Kostanay) did not switch, so create a zone Asia/Qostanay. 1000 1001 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 1002 It did not change clocks that day and remains on -08 this winter. 1003 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 1004 rules next spring, so this change affects only timestamps 1005 from 2018-11-04 through 2019-03-10. 1006 1007 Change to past timestamps 1008 1009 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 1010 not 00:00. I transcribed the time incorrectly from Shanks. 1011 (Thanks to Phake Nick.) 1012 1013 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 1014 (Thanks to Phake Nick.) 1015 1016 Guam observed DST irregularly from 1959 through 1977. 1017 (Thanks to Phake Nick.) 1018 1019 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 1020 10-01 changed standard time to +08:30 (not +08). Its transition 1021 back to +08 after WWII was on 1945-09-15, not the previous day. 1022 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 1023 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 1024 its 1952 fallback was on 11-02 (not 10-25). 1025 1026 This release contains many changes to timestamps before 1946 due 1027 to Japanese possession or occupation of Pacific/Chuuk, 1028 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 1029 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 1030 (Thanks to Phake Nick.) 1031 1032 Assume that the Spanish East Indies was like the Philippines and 1033 observed American time until the end of 1844. This affects 1034 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 1035 1036 Changes to past tm_isdst flags 1037 1038 For the recent Morocco change, the tm_isdst flag should be 1 from 1039 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 1040 Give a URL to the official decree. (Thanks to Matt Johnson.) 1041 1042 1043 Release 2018g - 2018-10-26 22:22:45 -0700 1044 1045 Briefly: 1046 Morocco switches to permanent +01 on 2018-10-28. 1047 1048 Changes to future timestamps 1049 1050 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 1051 so its clocks will not fall back as previously scheduled. 1052 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 1053 1054 Changes to code 1055 1056 When generating TZif files with leap seconds, zic no longer uses a 1057 format that trips up older 32-bit clients, fixing a bug introduced 1058 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 1059 for QTBUG-53071 now also works for TZif files with leap seconds. 1060 1061 The translator to rearguard format now rewrites the line 1062 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 1063 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 1064 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 1065 and earlier. (Reported by Christos Zoulas.) 1066 1067 Changes to past time zone abbreviations 1068 1069 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 1070 This reverts to 2011h, as the abbreviation change in 2011i was 1071 likely inadvertent. 1072 1073 Changes to documentation 1074 1075 tzfile.5 has new sections on interoperability issues. 1076 1077 1078 Release 2018f - 2018-10-18 00:14:18 -0700 1079 1080 Briefly: 1081 Volgograd moves from +03 to +04 on 2018-10-28. 1082 Fiji ends DST 2019-01-13, not 2019-01-20. 1083 Most of Chile changes DST dates, effective 2019-04-06. 1084 1085 Changes to future timestamps 1086 1087 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 1088 (Thanks to Alexander Fetisov and Stepan Golosunov.) 1089 1090 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 1091 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 1092 accordingly. 1093 1094 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 1095 time, and resume DST on the first Saturday in September at 24:00 mainland 1096 time. The changes are effective from 2019-04-06, and do not affect the 1097 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 1098 and Tim Parenti.) Adjust future predictions accordingly. 1099 1100 Changes to past timestamps 1101 1102 The 2018-05-05 North Korea 30-minute time zone change took place 1103 at 23:30 the previous day, not at 00:00 that day. 1104 1105 China's 1988 spring-forward transition was on April 17, not 1106 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 1107 (Thanks to P Chan.) 1108 1109 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 1110 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 1111 temporarily switched to +09/+10 during World War II. Macau 1112 observed DST in 1942/79, not 1961/80, and there were several 1113 errors for transition times and dates. (Thanks to P Chan.) 1114 1115 The 1948-1951 fallback transitions in Japan were at 25:00 on 1116 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 1117 zic turns this into 01:00 on the day after September's second 1118 Saturday, which is the best that POSIX or C platforms can do. 1119 1120 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 1121 paper by Li Yu, replacing more-questionable data from Shanks. 1122 1123 Changes to time zone abbreviations 1124 1125 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 1126 1127 Changes to code 1128 1129 zic now always generates TZif files where time type 0 is used for 1130 timestamps before the first transition. This simplifies the 1131 reading of TZif files and should not affect behavior of existing 1132 TZif readers because the same set of time types is used; only 1133 their internal indexes may have changed. This affects only the 1134 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 1135 EET, which previously used nonzero types for these timestamps. 1136 1137 Because of the type 0 change, zic no longer outputs a dummy 1138 transition at time -2**59 (before the Big Bang), as clients should 1139 no longer need this to handle historical timestamps correctly. 1140 This reverts a change introduced in 2013d and shrinks most TZif 1141 files by a few bytes. 1142 1143 zic now supports negative time-of-day in Rule and Leap lines, e.g., 1144 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 1145 occurs at 18:00 on the Saturday before the last Sunday in April. 1146 This behavior was documented in 2018a but the code did not 1147 entirely match the documentation. 1148 1149 localtime.c no longer requires at least one time type in TZif 1150 files that lack transitions or have a POSIX-style TZ string. This 1151 future-proofs the code against possible future extensions to the 1152 format that would allow TZif files with POSIX-style TZ strings and 1153 without transitions or time types. 1154 1155 A read-access subscript error in localtime.c has been fixed. 1156 It could occur only in TZif files with timecnt == 0, something that 1157 does not happen in practice now but could happen in future versions. 1158 1159 localtime.c no longer ignores TZif POSIX-style TZ strings that 1160 specify only standard time. Instead, these TZ strings now 1161 override the default time type for timestamps after the last 1162 transition (or for all timestamps if there are no transitions), 1163 just as DST strings specifying DST have always done. 1164 1165 leapseconds.awk now outputs "#updated" and "#expires" comments, 1166 and supports leap seconds at the ends of months other than June 1167 and December. (Inspired by suggestions from Chris Woodbury.) 1168 1169 Changes to documentation 1170 1171 New restrictions: A Rule name must start with a character that 1172 is neither an ASCII digit nor "-" nor "+", and an unquoted name 1173 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 1174 The latter restriction makes room for future extensions (a 1175 possibility noted by Tom Lane). 1176 1177 tzfile.5 now documents what time types apply before the first and 1178 after the last transition, if any. 1179 1180 Documentation now uses the spelling "timezone" for a TZ setting 1181 that determines timestamp history, and "time zone" for a 1182 geographic region currently sharing the same standard time. 1183 1184 The name "TZif" is now used for the tz binary data format. 1185 1186 tz-link.htm now mentions the A0 TimeZone Migration utilities. 1187 (Thanks to Aldrin Martoq for the link.) 1188 1189 Changes to build procedure 1190 1191 New 'make' target 'rearguard_tarballs' to build the rearguard 1192 tarball only. This is a convenience on platforms that lack lzip 1193 if you want to build the rearguard tarball. (Problem reported by 1194 Deborah Goldsmith.) 1195 1196 tzdata.zi is now more stable from release to release. (Problem 1197 noted by Tom Lane.) It is also a bit shorter. 1198 1199 tzdata.zi now can contain comment lines documenting configuration 1200 information, such as which data format was selected, which input 1201 files were used, and how leap seconds are treated. (Problems 1202 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 1203 are used these comment lines are absent, for backward 1204 compatibility. A redistributor intending to alter its copy of the 1205 files should also append "-LABEL" to the 'version' file's first 1206 line, where "LABEL" identifies the redistributor's change. 1207 1208 1209 Release 2018e - 2018-05-01 23:42:51 -0700 1210 1211 Briefly: 1212 1213 North Korea switches back to +09 on 2018-05-05. 1214 The main format uses negative DST again, for Ireland etc. 1215 'make tarballs' now also builds a rearguard tarball. 1216 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 1217 1218 Changes to past and future timestamps 1219 1220 North Korea switches back from +0830 to +09 on 2018-05-05. 1221 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 1222 and Tim Parenti.) 1223 1224 Bring back the negative-DST changes of 2018a, except be more 1225 compatible with data parsers that do not support negative DST. 1226 Also, this now affects historical timestamps in Namibia and the 1227 former Czechoslovakia, not just Ireland. The main format now uses 1228 negative DST to model timestamps in Europe/Dublin (from 1971 on), 1229 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 1230 does not affect UT offsets, only time zone abbreviations and the 1231 tm_isdst flag. Also, this does not affect rearguard or vanguard 1232 formats; effectively the main format now uses vanguard instead of 1233 rearguard format. Data parsers that do not support negative DST 1234 can still use data from the rearguard tarball described below. 1235 1236 Changes to build procedure 1237 1238 The command 'make tarballs' now also builds the tarball 1239 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 1240 except that it uses rearguard format intended for trailing-edge 1241 data parsers. 1242 1243 Changes to data format and to code 1244 1245 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 1246 suffix, which specifies whether the adjusted time is standard time 1247 or daylight saving time. If no suffix is given, daylight saving 1248 time is used if and only if the SAVE column is nonzero; this is 1249 the longstanding behavior. Although this new feature is not used 1250 in tzdata, it could be used to specify the legal time in Namibia 1251 1994-2017, as opposed to the popular time (see below). 1252 1253 Changes to past timestamps 1254 1255 From 1994 through 2017 Namibia observed DST in winter, not summer. 1256 That is, it used negative DST, as Ireland still does. This change 1257 does not affect UTC offsets; it affects only the tm_isdst flag and 1258 the abbreviation used during summer, which is now CAT, not WAST. 1259 Although (as noted by Michael Deckers) summer and winter time were 1260 both simply called "standard time" in Namibian law, in common 1261 practice winter time was considered to be DST (as noted by Stephen 1262 Colebourne). The full effect of this change is only in vanguard 1263 and main format; in rearguard format, the tm_isdst flag is still 1264 zero in winter and nonzero in summer. 1265 1266 In 1946/7 Czechoslovakia also observed negative DST in winter. 1267 The full effect of this change is only in vanguard and main 1268 formats; in rearguard format, it is modeled as plain GMT without 1269 daylight saving. Also, the dates of some 1944/5 DST transitions 1270 in Czechoslovakia have been changed. 1271 1272 1273 Release 2018d - 2018-03-22 07:05:46 -0700 1274 1275 Briefly: 1276 1277 Palestine starts DST a week earlier in 2018. 1278 Add support for vanguard and rearguard data consumers. 1279 Add subsecond precision to source data format, though not to data. 1280 1281 Changes to future timestamps 1282 1283 In 2018, Palestine starts DST on March 24, not March 31. 1284 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 1285 1286 Changes to past and future timestamps 1287 1288 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 1289 at 04:00. (Thanks to Steffen Thorsen.) 1290 1291 Changes to past timestamps 1292 1293 Historical transitions for Uruguay, represented by 1294 America/Montevideo, have been updated per official legal documents, 1295 replacing previous data mainly originating from the inventions of 1296 Shanks & Pottenger. This has resulted in adjustments ranging from 1297 30 to 90 minutes in either direction over at least two dozen 1298 distinct periods ranging from one day to several years in length. 1299 A mere handful of pre-1991 transitions are unaffected; data since 1300 then has come from more reliable contemporaneous reporting. These 1301 changes affect various timestamps in 1920-1923, 1936, 1939, 1302 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 1303 Additionally, Uruguay's pre-standard-time UT offset has been 1304 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 1305 match the location of the Observatory of the National Meteorological 1306 Institute in Montevideo. 1307 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 1308 1309 East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. 1310 (Thanks to Kerry Shetline.) 1311 1312 Fix the 1912-01-01 transition for Portugal and its colonies. 1313 This transition was at 00:00 according to the new UT offset, not 1314 according to the old one. Also assume that Cape Verde switched on 1315 the same date as the rest, not in 1907. This affects 1316 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 1317 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 1318 (Thanks to Michael Deckers.) 1319 1320 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 1321 Turks & Caicos. 1322 1323 Changes to past time zone abbreviations 1324 1325 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 1326 is no clock change associated with the transition. 1327 1328 Changes to build procedure 1329 1330 The new DATAFORM macro in the Makefile lets the installer choose 1331 among three source data formats. The idea is to lessen downstream 1332 disruption when data formats are improved. 1333 1334 * DATAFORM=vanguard installs from the latest, bleeding-edge 1335 format. DATAFORM=main (the default) installs from the format 1336 used in the 'africa' etc. files. DATAFORM=rearguard installs 1337 from a trailing-edge format. Eventually, elements of today's 1338 vanguard format should move to the main format, and similarly 1339 the main format's features should eventually move to the 1340 rearguard format. 1341 1342 * In the current version, the main and rearguard formats are 1343 identical and match that of 2018c, so this change does not 1344 affect default behavior. The vanguard format currently contains 1345 one feature not in the main format: negative SAVE values. This 1346 improves support for Ireland, which uses Irish Standard Time 1347 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 1348 supported negative SAVE values for decades, and this feature 1349 should move to the main format soon. However, it will not move 1350 to the rearguard format for quite some time because some 1351 downstream parsers do not support it. 1352 1353 * The build procedure constructs three files vanguard.zi, main.zi, 1354 and rearguard.zi, one for each format. Although the files 1355 represent essentially the same data, they may have minor 1356 discrepancies that users are not likely to notice. The files 1357 are intended for downstream data consumers and are not 1358 installed. Zoneinfo parsers that do not support negative SAVE values 1359 should start using rearguard.zi, so that they will be unaffected 1360 when the negative-DST feature moves from vanguard to main. 1361 Bleeding-edge Zoneinfo parsers that support the new features 1362 already can use vanguard.zi; in this respect, current tzcode is 1363 bleeding-edge. 1364 1365 The Makefile should now be safe for parallelized builds, and 'make 1366 -j to2050new.tzs' is now much faster on a multiprocessor host 1367 with GNU Make. 1368 1369 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 1370 prepends TZDIR/ to file names that do not begin with '/'. This is 1371 not recommended for general use, due to its security implications. 1372 (From a suggestion by Manuela Friedrich.) 1373 1374 Changes to code 1375 1376 zic now accepts subsecond precision in expressions like 1377 00:19:32.13, which is approximately the legal time of the 1378 Netherlands from 1835 to 1937. However, because it is 1379 questionable whether the few recorded uses of non-integer offsets 1380 had subsecond precision in practice, there are no plans for tzdata 1381 to use this feature. (Thanks to Steve Allen for pointing out 1382 the limitations of historical data in this area.) 1383 1384 The code is a bit more portable to MS-Windows. Installers can 1385 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 1386 reserve identifiers like 'localtime'. (Thanks to Manuela 1387 Friedrich.) 1388 1389 Changes to documentation and commentary 1390 1391 theory.html now outlines tzdb's extensions to POSIX's model for 1392 civil time, and has a section "POSIX features no longer needed" 1393 that lists POSIX API components that are now vestigial. 1394 (From suggestions by Steve Summit.) It also better distinguishes 1395 time zones from tz regions. (From a suggestion by Guy Harris.) 1396 1397 Commentary is now more consistent about using the phrase "daylight 1398 saving time", to match the C name tm_isdst. Daylight saving time 1399 need not occur in summer, and need not have a positive offset from 1400 standard time. 1401 1402 Commentary about historical transitions in Uruguay has been expanded 1403 with links to many relevant legal documents. 1404 (Thanks to Tim Parenti.) 1405 1406 Commentary now uses some non-ASCII characters with Unicode value 1407 less than U+0100, as they can be useful and should work even with 1408 older editors such as XEmacs. 1409 1410 1411 Release 2018c - 2018-01-22 23:00:44 -0800 1412 1413 Briefly: 1414 Revert Irish changes that relied on negative SAVE values. 1415 1416 Changes to tm_isdst 1417 1418 Revert the 2018a change to Europe/Dublin. As before, this change 1419 does not affect UT offsets or abbreviations; it affects only 1420 whether timestamps are considered to be standard time or 1421 daylight-saving time, as expressed in the tm_isdst flag of C's 1422 struct tm type. This reversion is intended to be a temporary 1423 workaround for problems discovered with downstream uses of 1424 releases 2018a and 2018b, which implemented Irish time by using 1425 negative SAVE values in the Eire rules of the 'europe' file. 1426 Although negative SAVE values have been part of tzcode for many 1427 years and are supported by many platforms, they were not 1428 documented before 2018a and ICU and OpenJDK do not currently 1429 support them. A mechanism to export data to platforms lacking 1430 support for negative DST is planned to be developed before the 1431 change is reapplied. (Problems reported by Deborah Goldsmith and 1432 Stephen Colebourne.) 1433 1434 Changes to past timestamps 1435 1436 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 1437 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 1438 1439 Changes to build procedure 1440 1441 The build procedure now works around mawk 1.3.3's lack of support 1442 for character class expressions. (Problem reported by Ohyama.) 1443 1444 1445 Release 2018b - 2018-01-17 23:24:48 -0800 1446 1447 Briefly: 1448 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 1449 1450 Changes to build procedure 1451 1452 The distribution now contains the file 'pacificnew' again. 1453 This file was inadvertently omitted in the 2018a distribution. 1454 (Problem reported by Matias Fonzo.) 1455 1456 1457 Release 2018a - 2018-01-12 22:29:21 -0800 1458 1459 Briefly: 1460 So Tom and Prncipe switched from +00 to +01. 1461 Brazil's DST will now start on November's first Sunday. 1462 Ireland's standard time is now in the summer, not the winter. 1463 Use Debian-style installation locations, instead of 4.3BSD-style. 1464 New zic option -t. 1465 1466 Changes to past and future timestamps 1467 1468 So Tom and Prncipe switched from +00 to +01 on 2018-01-01 at 1469 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 1470 1471 Changes to future timestamps 1472 1473 Starting in 2018 southern Brazil will begin DST on November's 1474 first Sunday instead of October's third Sunday. (Thanks to 1475 Steffen Thorsen.) 1476 1477 Changes to past timestamps 1478 1479 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 1480 been corrected. The 'backzone' and 'zone.tab' files did not agree 1481 with the 'africa' and 'zone1970.tab' files. (Problem reported by 1482 Michael Deckers.) 1483 1484 The abbreviation invented for Bolivia Summer Time (1931-2) is now 1485 BST instead of BOST, to be more consistent with the convention 1486 used for Latvian Summer Time (1918-9) and for British Summer Time. 1487 1488 Changes to tm_isdst 1489 1490 Change Europe/Dublin so that it observes Irish Standard Time (UT 1491 +01) in summer and GMT (as negative daylight-saving) in winter, 1492 instead of observing standard time (GMT) in winter and Irish 1493 Summer Time (UT +01) in summer. This change does not affect UT 1494 offsets or abbreviations; it affects only whether timestamps are 1495 considered to be standard time or daylight-saving time, as 1496 expressed in the tm_isdst flag of C's struct tm type. 1497 (Discrepancy noted by Derick Rethans.) 1498 1499 Changes to build procedure 1500 1501 The default installation locations have been changed to mostly 1502 match Debian circa 2017, instead of being designed as an add-on to 1503 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 1504 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 1505 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 1506 locations more precisely. (This responds to suggestions from 1507 Brian Inglis and from Steve Summit.) 1508 1509 The default installation procedure no longer creates the 1510 backward-compatibility link US/Pacific-New, which causes 1511 confusion during user setup (e.g., see Debian bug 815200). 1512 Use 'make BACKWARD="backward pacificnew"' to create the link 1513 anyway, for now. Eventually we plan to remove the link entirely. 1514 1515 tzdata.zi now contains a version-number comment. 1516 (Suggested by Tom Lane.) 1517 1518 The Makefile now quotes values like BACKWARD more carefully when 1519 passing them to the shell. (Problem reported by Zefram.) 1520 1521 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 1522 that have snprintf and use pre-C99 compilers. (Problem reported 1523 by Jon Skeet.) 1524 1525 Changes to code 1526 1527 zic has a new option -t FILE that specifies the location of the 1528 file that determines local time when TZ is unset. The default for 1529 this location can be configured via the new TZDEFAULT makefile 1530 macro, which defaults to /etc/localtime. 1531 1532 Diagnostics and commentary now distinguish UT from UTC more 1533 carefully; see theory.html for more information about UT vs UTC. 1534 1535 zic has been ported to GCC 8's -Wstringop-truncation option. 1536 (Problem reported by Martin Sebor.) 1537 1538 Changes to documentation and commentary 1539 1540 The zic man page now documents the longstanding behavior that 1541 times and years can be out of the usual range, with negative times 1542 counting backwards from midnight and with year 0 preceding year 1. 1543 (Problem reported by Michael Deckers.) 1544 1545 The theory.html file now mentions the POSIX limit of six chars 1546 per abbreviation, and lists alphabetic abbreviations used. 1547 1548 The files tz-art.htm and tz-link.htm have been renamed to 1549 tz-art.html and tz-link.html, respectively, for consistency with 1550 other file names and to simplify web server configuration. 1551 1552 1553 Release 2017c - 2017-10-20 14:49:34 -0700 1554 1555 Briefly: 1556 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 1557 Fiji ends DST 2018-01-14, not 2018-01-21. 1558 Namibia switches from +01/+02 to +02 on 2018-04-01. 1559 Sudan switches from +03 to +02 on 2017-11-01. 1560 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 1561 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 1562 A new file tzdata.zi now holds a small text copy of all data. 1563 The zic input format has been regularized slightly. 1564 1565 Changes to future timestamps 1566 1567 Northern Cyprus has decided to resume EU rules starting 1568 2017-10-29, thus reinstituting winter time. 1569 1570 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 1571 predicted. (Thanks to Dominic Fok.) Adjust future predictions 1572 accordingly. 1573 1574 Namibia will switch from +01 with DST to +02 all year on 1575 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 1576 at 02:00. (Thanks to Steffen Thorsen.) 1577 1578 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 1579 Atyya and Yahia Abdalla.) South Sudan is not switching, so 1580 Africa/Juba is no longer a link to Africa/Khartoum. 1581 1582 Tonga has likely ended its experiment with DST, and will not 1583 adjust its clocks on 2017-11-05. Although Tonga has not announced 1584 whether it will continue to observe DST, the IATA is assuming that 1585 it will not. (Thanks to David Wade.) 1586 1587 Turks & Caicos will switch from -04 all year to -05 with US DST on 1588 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 1589 at 02:00. (Thanks to Steffen Thorsen.) 1590 1591 Changes to past timestamps 1592 1593 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 1594 (Thanks to Arthur David Olson.) 1595 1596 Detroit did not observe DST in 1967. 1597 1598 Use railway time for Asia/Kolkata before 1941, by switching to 1599 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 1600 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 1601 1602 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 1603 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 1604 1605 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 1606 American time in 1892, not 1879. (Thanks to Michael Deckers.) 1607 1608 Adjust the 1867 transition in Alaska to better reflect the 1609 historical record, by changing it to occur on 1867-10-18 at 15:30 1610 Sitka time rather than at the start of 1867-10-17 local time. 1611 Although strictly speaking this is accurate only for Sitka, 1612 the rest of Alaska's blanks need to be filled in somehow. 1613 1614 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 1615 (Thanks to Michael Deckers.) 1616 1617 Add 7 s to the UT offset in Asia/Yangon before 1920. 1618 1619 Changes to zone names 1620 1621 Remove Canada/East-Saskatchewan from the 'backward' file, as it 1622 exceeded the 14-character limit and was an unused misnomer anyway. 1623 1624 Changes to build procedure 1625 1626 To support applications that prefer to read time zone data in text 1627 form, two zic input files tzdata.zi and leapseconds are now 1628 installed by default. The commands 'zic tzdata.zi' and 'zic -L 1629 leapseconds tzdata.zi' can reproduce the tzdata binary files 1630 without and with leap seconds, respectively. To prevent these two 1631 new files from being installed, use 'make TZDATA_TEXT=', and to 1632 suppress leap seconds from the tzdata text installation, use 'make 1633 TZDATA_TEXT=tzdata.zi'. 1634 1635 'make BACKWARD=' now suppresses backward-compatibility names 1636 like 'US/Pacific' that are defined in the 'backward' and 1637 'pacificnew' files. 1638 1639 'make check' now works on systems that lack a UTF-8 locale, 1640 or that lack the nsgmls program. Set UTF8_LOCALE to configure 1641 the name of a UTF-8 locale, if you have one. 1642 1643 Y2K runtime checks are no longer enabled by default. Add 1644 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 1645 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 1646 to disable them. (New name suggested by Brian Inglis.) 1647 1648 The build procedure for zdump now works on AIX 7.1. 1649 (Problem reported by Kees Dekker.) 1650 1651 Changes to code 1652 1653 zic and the reference runtime now reject multiple leap seconds 1654 within 28 days of each other, or leap seconds before the Epoch. 1655 As a result, support for double leap seconds, which was 1656 obsolescent and undocumented, has been removed. Double leap 1657 seconds were an error in the C89 standard; they have never existed 1658 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 1659 noticing glitches in the code that uncovered this problem.) 1660 1661 zic now warns about use of the obsolescent and undocumented -y 1662 option, and about use of the obsolescent TYPE field of Rule lines. 1663 1664 zic now allows unambiguous abbreviations like "Sa" and "Su" for 1665 weekdays; formerly it rejected them due to a bug. Conversely, zic 1666 no longer considers non-prefixes to be abbreviations; for example, 1667 it no longer accepts "lF" as an abbreviation for "lastFriday". 1668 Also, zic warns about the undocumented usage with a "last-" 1669 prefix, e.g., "last-Fri". 1670 1671 Similarly, zic now accepts the unambiguous abbreviation "L" for 1672 "Link" in ordinary context and for "Leap" in leap-second context. 1673 Conversely, zic no longer accepts non-prefixes such as "La" as 1674 abbreviations for words like "Leap". 1675 1676 zic no longer accepts leap second lines in ordinary input, or 1677 ordinary lines in leap second input. Formerly, zic sometimes 1678 warned about this undocumented usage and handled it incorrectly. 1679 1680 The new macro HAVE_TZNAME governs whether the tzname external 1681 variable is exported, instead of USG_COMPAT. USG_COMPAT now 1682 governs only the external variables "timezone" and "daylight". 1683 This change is needed because the three variables are not in the 1684 same category: although POSIX requires tzname, it specifies the 1685 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 1686 if not defined, the code attempts to guess it from other macros. 1687 1688 localtime.c and difftime.c no longer require stdio.h, and .c files 1689 other than zic.c no longer require sys/wait.h. 1690 1691 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 1692 1693 Calculation of time_t extrema works around a bug in GCC 4.8.4 1694 (Reported by Stan Shebs and Joseph Myers.) 1695 1696 zic.c no longer mistranslates formats of line numbers in non-English 1697 locales. (Problem reported by Benno Schulenberg.) 1698 1699 Several minor changes have been made to the code to make it a 1700 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 1701 Dekker for reporting the problems.) 1702 1703 Changes to documentation and commentary 1704 1705 The two new files 'theory.html' and 'calendars' contain the 1706 contents of the removed file 'Theory'. The goal is to document 1707 tzdb theory more accessibly. 1708 1709 The zic man page now documents abbreviation rules. 1710 1711 tz-link.htm now covers how to apply tzdata changes to clients. 1712 (Thanks to Jorge Fbregas for the AIX link.) It also mentions MySQL. 1713 1714 The leap-seconds.list URL has been updated to something that is 1715 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 1716 1717 Release 2017b - 2017-03-17 07:30:38 -0700 1718 1719 Briefly: Haiti has resumed DST. 1720 1721 Changes to past and future timestamps 1722 1723 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 1724 1725 Changes to past timestamps 1726 1727 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 1728 1729 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 1730 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 1731 1732 Changes to code 1733 1734 The reference localtime implementation now falls back on the 1735 current US daylight-saving transition rules rather than the 1736 1987-2006 rules. This fallback occurs only when (1) the TZ 1737 environment variable has a value like "AST4ADT" that asks 1738 for daylight saving time but does not specify the rules, (2) there 1739 is no file by that name, and (3) the TZDEFRULES file cannot be 1740 loaded. (Thanks to Tom Lane.) 1741 1742 1743 Release 2017a - 2017-02-28 00:05:36 -0800 1744 1745 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 1746 discontinues DST. 1747 1748 Changes to future timestamps 1749 1750 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 1751 1752 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 1753 Its clocks diverge from America/Santiago starting 2017-05-13 at 1754 23:00, hiving off a new zone America/Punta_Arenas. Although the 1755 Chilean government says this change expires in May 2019, for now 1756 assume it's permanent. (Thanks to Juan Correa and Deborah 1757 Goldsmith.) This also affects Antarctica/Palmer. 1758 1759 Changes to past timestamps 1760 1761 Fix many entries for historical timestamps for Europe/Madrid 1762 before 1979, to agree with tables compiled by Pere Planesas of the 1763 National Astronomical Observatory of Spain. As a side effect, 1764 this changes some timestamps for Africa/Ceuta before 1929, which 1765 are probably guesswork anyway. (Thanks to Steve Allen and 1766 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 1767 correcting the 1901 transition.) 1768 1769 Ecuador observed DST from 1992-11-28 to 1993-02-05. 1770 (Thanks to Alois Treindl.) 1771 1772 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 1773 (Thanks to Stepan Golosunov.) 1774 1775 Changes to past and future time zone abbreviations 1776 1777 Switch to numeric time zone abbreviations for South America, as 1778 part of the ongoing project of removing invented abbreviations. 1779 This avoids the need to invent an abbreviation for the new Chilean 1780 new zone. Similarly, switch from invented to numeric time zone 1781 abbreviations for Afghanistan, American Samoa, the Azores, 1782 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 1783 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 1784 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 1785 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 1786 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 1787 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 1788 Papua New Guinea, the Philippines, Pitcairn, Qatar, Runion, St 1789 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 1790 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 1791 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 1792 for half-hour daylight saving time in Belize before 1944 and in 1793 the Dominican Republic before 1975; and for Canary Islands before 1794 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 1795 Indian Summer Time before 1942, for Indonesia before around 1964, 1796 for Kenya before 1960, for Liberia before 1973, for Madeira before 1797 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 1798 Pakistan before 1971, for Western Sahara before 1977, and for 1799 Zaporozhye in 1880-1924. 1800 1801 For Alaska time from 1900 through 1967, instead of "CAT" use the 1802 abbreviation "AST", the abbreviation commonly used at the time 1803 (Atlantic Standard Time had not been standardized yet). Use "AWT" 1804 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 1805 1806 Use "CST" and "CDT" instead of invented abbreviations for Macau 1807 before 1999 and Taiwan before 1938, and use "JST" instead of the 1808 invented abbreviation "JCST" for Japan and Korea before 1938. 1809 1810 Change to database entry category 1811 1812 Move the Pacific/Johnston link from 'australasia' to 'backward', 1813 since Johnston is now uninhabited. 1814 1815 Changes to code 1816 1817 zic no longer mishandles some transitions in January 2038 when it 1818 attempts to work around Qt bug 53071. This fixes a bug affecting 1819 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 1820 now contains a workaround, useful when loading a file generated by 1821 a buggy zic. (Problem and localtime.c fix reported by Bradley 1822 White.) 1823 1824 zdump -i now outputs non-hour numeric time zone abbreviations 1825 without a colon, e.g., "+0530" rather than "+05:30". This agrees 1826 with zic %z and with common practice, and simplifies auditing of 1827 zdump output. 1828 1829 zdump is now buildable again with -DUSE_LTZ=0. 1830 (Problem reported by Joseph Myers.) 1831 1832 zdump.c now always includes private.h, to avoid code duplication 1833 with private.h. (Problem reported by Kees Dekker.) 1834 1835 localtime.c no longer mishandles early or late timestamps 1836 when TZ is set to a POSIX-style string that specifies DST. 1837 (Problem reported by Kees Dekker.) 1838 1839 date and strftime now cause %z to generate "-0000" instead of 1840 "+0000" when the UT offset is zero and the time zone abbreviation 1841 begins with "-". 1842 1843 Changes to documentation and commentary 1844 1845 The 'Theory' file now better documents choice of historical time 1846 zone abbreviations. (Problems reported by Michael Deckers.) 1847 1848 tz-link.htm now covers leap smearing, which is popular in clouds. 1849 1850 1851 Release 2016j - 2016-11-22 23:17:13 -0800 1852 1853 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 1854 1855 Changes to future timestamps 1856 1857 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 1858 This hives off a new zone Europe/Saratov from Europe/Volgograd. 1859 (Thanks to Yuri Konotopov and Stepan Golosunov.) 1860 1861 Changes to past timestamps 1862 1863 The new zone Asia/Atyrau for Atyra Region, Kazakhstan, is like 1864 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 1865 1999, not fall 1994. (Thanks to Stepan Golosunov.) 1866 1867 Changes to past time zone abbreviations 1868 1869 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 1870 summer time before 1948. The old use of "EET" was a typo. 1871 1872 Changes to code 1873 1874 zic no longer mishandles file systems that lack hard links, fixing 1875 bugs introduced in 2016g. (Problems reported by Tom Lane.) 1876 Also, when the destination already contains symbolic links, zic 1877 should now work better on systems where the 'link' system call 1878 does not follow symbolic links. 1879 1880 Changes to documentation and commentary 1881 1882 tz-link.htm now documents the relationship between release version 1883 numbers and development-repository commit tags. (Suggested by 1884 Paul Koning.) 1885 1886 The 'Theory' file now documents UT. 1887 1888 iso3166.tab now accents "Curaao", and commentary now mentions 1889 the names "Cabo Verde" and "Czechia". (Thanks to Ji Boh.) 1890 1891 1892 Release 2016i - 2016-11-01 23:19:52 -0700 1893 1894 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 1895 reintroduces DST on 2016-11-06. 1896 1897 Changes to future timestamps 1898 1899 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 1900 2017-01-15 at 03:00. Assume future observances in Tonga will be 1901 from the first Sunday in November through the third Sunday in 1902 January, like Fiji. (Thanks to Pulu Anau.) Switch to numeric 1903 time zone abbreviations for this zone. 1904 1905 Changes to past and future timestamps 1906 1907 Northern Cyprus is now +03 year round, causing a split in Cyprus 1908 time zones starting 2016-10-30 at 04:00. This creates a zone 1909 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 1910 1911 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 1912 (Thanks to Steffen Thorsen.) 1913 1914 Changes to past timestamps 1915 1916 Several corrections were made for pre-1975 timestamps in Italy. 1917 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 1918 Europe/Vatican. 1919 1920 First, the 1893-11-01 00:00 transition in Italy used the new UT 1921 offset (+01), not the old (+00:49:56). (Thanks to Michael 1922 Deckers.) 1923 1924 Second, rules for daylight saving in Italy were changed to agree 1925 with Italy's National Institute of Metrological Research (INRiM) 1926 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 1927 Inglis, and Michael Deckers): 1928 1929 The 1916-06-03 transition was at 24:00, not 00:00. 1930 1931 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 1932 00:00, not 01:00. 1933 1934 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 1935 01:00. 1936 1937 The 1944-09-17 transition was at 03:00, not 01:00. This 1938 particular change is taken from Italian law as INRiM's table, 1939 (which says 02:00) appears to have a typo here. Also, keep the 1940 1944-04-03 transition for Europe/Rome, as Rome was controlled by 1941 Germany then. 1942 1943 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 1944 not 00:00. 1945 1946 Changes to code 1947 1948 The code should now be buildable on AmigaOS merely by setting the 1949 appropriate Makefile variables. (From a patch by Carsten Larsen.) 1950 1951 1952 Release 2016h - 2016-10-19 23:17:57 -0700 1953 1954 Changes to future timestamps 1955 1956 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 1957 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 1958 future fall transitions will be on the last Saturday of October 1959 at 01:00, which is consistent with predicted spring transitions 1960 on the last Saturday of March. (Thanks to Tim Parenti.) 1961 1962 Changes to past timestamps 1963 1964 In Turkey, transitions in 1986-1990 were at 01:00 standard time 1965 not at 02:00, and the spring 1994 transition was on March 20, not 1966 March 27. (Thanks to Kvan Yazan.) 1967 1968 Changes to past and future time zone abbreviations 1969 1970 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 1971 instead of alphabetic ones like "IST" and "LKT". Various 1972 English-language sources use "IST", "LKT" and "SLST", with no 1973 working consensus. (Usage of "SLST" mentioned by Sadika 1974 Sumanapala.) 1975 1976 Changes to code 1977 1978 zic no longer mishandles relativizing file names when creating 1979 symbolic links like /etc/localtime, when these symbolic links 1980 are outside the usual directory hierarchy. This fixes a bug 1981 introduced in 2016g. (Problem reported by Andreas Stieger.) 1982 1983 Changes to build procedure 1984 1985 New rules 'traditional_tarballs' and 'traditional_signatures' for 1986 building just the traditional-format distribution. (Requested by 1987 Deborah Goldsmith.) 1988 1989 The file 'version' is now put into the tzdata tarball too. 1990 (Requested by Howard Hinnant.) 1991 1992 Changes to documentation and commentary 1993 1994 The 'Theory' file now has a section on interface stability. 1995 (Requested by Paul Koning.) It also mentions features like 1996 tm_zone and localtime_rz that have long been supported by the 1997 reference code. 1998 1999 tz-link.htm has improved coverage of time zone boundaries suitable 2000 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 2001 Johnson.) 2002 2003 The US commentary now mentions Allen and the "day of two noons". 2004 2005 The Fiji commentary mentions the government's 2016-10-03 press 2006 release. (Thanks to Raymond Kumar.) 2007 2008 2009 Release 2016g - 2016-09-13 08:56:38 -0700 2010 2011 Changes to future timestamps 2012 2013 Turkey switched from EET/EEST (+02/+03) to permanent +03, 2014 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 2015 than an invented abbreviation for the new time. 2016 2017 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 2018 (Thanks to Tim Parenti.) 2019 2020 Changes to past timestamps 2021 2022 For America/Los_Angeles, spring-forward transition times have been 2023 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 2024 1950-1966. 2025 2026 For zones using Soviet time on 1919-07-01, transitions to UT-based 2027 time were at 00:00 UT, not at 02:00 local time. The affected 2028 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 2029 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 2030 2031 Changes to past and future time zone abbreviations 2032 2033 The Factory zone now uses the time zone abbreviation -00 instead 2034 of a long English-language string, as -00 is now the normal way to 2035 represent an undefined time zone. 2036 2037 Several zones in Antarctica and the former Soviet Union, along 2038 with zones intended for ships at sea that cannot use POSIX TZ 2039 strings, now use numeric time zone abbreviations instead of 2040 invented or obsolete alphanumeric abbreviations. The affected 2041 zones are Antarctica/Casey, Antarctica/Davis, 2042 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 2043 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 2044 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 2045 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 2046 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 2047 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 2048 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 2049 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 2050 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 2051 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 2052 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 2053 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 2054 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 2055 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 2056 was replaced by +05, whereas MSK and MSD were kept as they are not 2057 our invention and are widely used. 2058 2059 Changes to zone names 2060 2061 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 2062 (Thanks to David Massoud.) 2063 2064 Changes to code 2065 2066 zic no longer generates binary files containing POSIX TZ-like 2067 strings that disagree with the local time type after the last 2068 explicit transition in the data. This fixes a bug with 2069 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 2070 on the reference platform. (Thanks to Alexander Belopolsky for 2071 reporting the bug and suggesting a way forward.) 2072 2073 If the installed localtime and/or posixrules files are symbolic 2074 links, zic now keeps them symbolic links when updating them, for 2075 compatibility with platforms like OpenSUSE where other programs 2076 configure these files as symlinks. 2077 2078 zic now avoids hard linking to symbolic links, avoids some 2079 unnecessary mkdir and stat system calls, and uses shorter file 2080 names internally. 2081 2082 zdump has a new -i option to generate transitions in a 2083 more-compact but still human-readable format. This option is 2084 experimental, and the output format may change in future versions. 2085 (Thanks to Jon Skeet for suggesting that an option was needed, 2086 and thanks to Tim Parenti and Chris Rovick for further comments.) 2087 2088 Changes to build procedure 2089 2090 An experimental distribution format is available, in addition 2091 to the traditional format which will continue to be distributed. 2092 The new format is a tarball tzdb-VERSION.tar.lz with signature 2093 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 2094 tzdb-VERSION containing the code and data of the traditional 2095 two-tarball format, along with extra data that may be useful. 2096 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 2097 for comments about the experimental format.) 2098 2099 The release version number is now more accurate in the usual case 2100 where releases are built from a Git repository. For example, if 2101 23 commits and some working-file changes have been made since 2102 release 2016g, the version number is now something like 2103 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 2104 Tagged releases use the same version number format as before, 2105 e.g., '2016g'. To support the more-accurate version number, its 2106 specification has moved from a line in the Makefile to a new 2107 source file 'version'. 2108 2109 The experimental distribution contains a file to2050.tzs that 2110 contains what should be the output of 'zdump -i -c 2050' on 2111 primary zones. If this file is available, 'make check' now checks 2112 that zdump generates this output. 2113 2114 'make check_web' now works on Fedora-like distributions. 2115 2116 Changes to documentation and commentary 2117 2118 tzfile.5 now documents the new restriction on POSIX TZ-like 2119 strings that is now implemented by zic. 2120 2121 Comments now cite URLs for some 1917-1921 Russian DST decrees. 2122 (Thanks to Alexander Belopolsky.) 2123 2124 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 2125 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 2126 description of Java 8 has been brought up to date (thanks to 2127 Stephen Colebourne). Its description of local time on Mars has 2128 been updated to match current practice, and URLs have been updated 2129 and some obsolete ones removed. 2130 2131 2132 Release 2016f - 2016-07-05 16:26:51 +0200 2133 2134 Changes affecting future timestamps 2135 2136 The Egyptian government changed its mind on short notice, and 2137 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 2138 (Thanks to Mina Samuel.) 2139 2140 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 2141 (Thanks to Stepan Golosunov.) 2142 2143 Changes to past and future timestamps 2144 2145 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 2146 abbreviations instead of invented ones. 2147 2148 Changes affecting past timestamps 2149 2150 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 2151 (Thanks to Stepan Golosunov.) 2152 2153 2154 Release 2016e - 2016-06-14 08:46:16 -0700 2155 2156 Changes affecting future timestamps 2157 2158 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 2159 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 2160 For future years, guess April's last Thursday to October's last 2161 Thursday except for Ramadan. 2162 2163 Changes affecting past timestamps 2164 2165 Locations while uninhabited now use '-00', not 'zzz', as a 2166 placeholder time zone abbreviation. This is inspired by Internet 2167 RFC 3339 and is more consistent with numeric time zone 2168 abbreviations already used elsewhere. The change affects several 2169 arctic and antarctic locations, e.g., America/Cambridge_Bay before 2170 1920 and Antarctica/Troll before 2005. 2171 2172 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 2173 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 2174 2175 Changes to code 2176 2177 zic now outputs a dummy transition at time 2**31 - 1 in zones 2178 whose POSIX-style TZ strings contain a '<'. This mostly works 2179 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 2180 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 2181 2182 Changes affecting documentation and commentary 2183 2184 tz-link.htm says why governments should give plenty of notice for 2185 time zone or DST changes, and refers to Matt Johnson's blog post. 2186 2187 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 2188 2189 2190 Release 2016d - 2016-04-17 22:50:29 -0700 2191 2192 Changes affecting future timestamps 2193 2194 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 2195 (Thanks to Alexander Krivenyshev for the heads-up.) 2196 2197 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 2198 (Thanks to Alexander Krivenyshev and Matt Johnson.) 2199 2200 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 2201 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 2202 at 02:00. (Thanks to Stepan Golosunov.) 2203 2204 Changes affecting past timestamps 2205 2206 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 2207 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 2208 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 2209 the same change. (Thanks to Stepan Golosunov.) 2210 2211 Russia and nearby locations had daylight-saving transitions on 2212 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 2213 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 2214 Golosunov.) 2215 2216 Many corrections to historical time in Kazakhstan from 1991 2217 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 2218 invented time zone abbreviations with numeric abbreviations. 2219 2220 Changes to commentary 2221 2222 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 2223 2224 2225 Release 2016c - 2016-03-23 00:51:27 -0700 2226 2227 Changes affecting future timestamps 2228 2229 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 2230 2231 Chile reverts from permanent to seasonal DST. (Thanks to Juan 2232 Correa for the heads-up, and to Tim Parenti for corrections.) 2233 Guess that future transitions are August's and May's second 2234 Saturdays at 24:00 mainland time. Also, call the period from 2235 2014-09-07 through 2016-05-14 daylight saving time instead of 2236 standard time, as that seems more appropriate now. 2237 2238 Changes affecting past timestamps 2239 2240 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 2241 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 2242 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 2243 (Thanks to Stepan Golosunov.) 2244 2245 Changes to commentary 2246 2247 Several updates and URLs for historical and proposed Russian changes. 2248 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 2249 2250 2251 Release 2016b - 2016-03-12 17:30:14 -0800 2252 2253 Compatibility note 2254 2255 Starting with release 2016b, some data entries cause zic implementations 2256 derived from tz releases 2005j through 2015e to issue warnings like 2257 "time zone abbreviation differs from POSIX standard (+03)". 2258 These warnings should not otherwise affect zic's output and can safely be 2259 ignored on today's platforms, as the warnings refer to a restriction in 2260 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 2261 warnings is to upgrade to zic derived from tz releases 2015f and later. 2262 2263 Changes affecting future timestamps 2264 2265 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 2266 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 2267 2016-03-27 at 02:00 local time. They need distinct zones since their 2268 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 2269 Altai Republic, Russia, which will switch from +06 to +07 on the same date 2270 and local time. The Astrakhan change is already official; the others have 2271 passed the first reading in the State Duma and are extremely likely. 2272 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 2273 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 2274 and Stepan Golosunov for followup.) 2275 2276 As a trial of a new system that needs less information to be made up, 2277 the new zones use numeric time zone abbreviations like "+04" 2278 instead of invented abbreviations like "ASTT". 2279 2280 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 2281 Steffen Thorsen.) 2282 2283 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 2284 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 2285 Saturday at 01:00, not March's last Friday at 24:00. 2286 2287 Changes affecting past timestamps 2288 2289 Europe/Chisinau observed DST during 1990, and switched from +04 to 2290 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 2291 (Thanks to Stepan Golosunov.) 2292 2293 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 2294 KUYT/KUYST. (Thanks to Stepan Golosunov.) 2295 2296 Changes to code 2297 2298 tzselect's diagnostics and checking, and checktab.awk's checking, 2299 have been improved. (Thanks to J William Piggott.) 2300 2301 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 2302 2303 tzselect now tests Julian-date TZ settings more accurately. 2304 (Thanks to J William Piggott.) 2305 2306 Changes to commentary 2307 2308 Comments in zone tables have been improved. (Thanks to J William Piggott.) 2309 2310 tzselect again limits its menu comments so that menus fit on a 2311 2480 alphanumeric display. 2312 2313 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 2314 2315 In the Theory file, the description of possible time zone abbreviations in 2316 tzdata has been cleaned up, as the old description was unclear and 2317 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 2318 2319 2320 Release 2016a - 2016-01-26 23:28:02 -0800 2321 2322 Changes affecting future timestamps 2323 2324 America/Cayman will not observe daylight saving this year after all. 2325 Revert our guess that it would. (Thanks to Matt Johnson.) 2326 2327 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 2328 (Thanks to Alexander Krivenyshev.) 2329 2330 Asia/Tehran now has DST predictions for the year 2038 and later, 2331 to be March 21 00:00 to September 21 00:00. This is likely better 2332 than predicting no DST, albeit off by a day every now and then. 2333 2334 Changes affecting past and future timestamps 2335 2336 America/Metlakatla switched from PST all year to AKST/AKDT on 2337 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 2338 2339 America/Santa_Isabel has been removed, and replaced with a 2340 backward compatibility link to America/Tijuana. Its contents were 2341 apparently based on a misreading of Mexican legislation. 2342 2343 Changes affecting past timestamps 2344 2345 Asia/Karachi's two transition times in 2002 were off by a minute. 2346 (Thanks to Matt Johnson.) 2347 2348 Changes affecting build procedure 2349 2350 An installer can now combine leap seconds with use of the backzone file, 2351 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 2352 The old 'make posix_packrat' rule is now marked as obsolescent. 2353 (Thanks to Ian Abbott for an initial implementation.) 2354 2355 Changes affecting documentation and commentary 2356 2357 A new file LICENSE makes it easier to see that the code and data 2358 are mostly public-domain. (Thanks to James Knight.) The three 2359 non-public-domain files now use the current (3-clause) BSD license 2360 instead of older versions of that license. 2361 2362 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 2363 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 2364 on editing tz source files (with a mention of Sublime zoneinfo, 2365 thanks to Gilmore Davidson). 2366 2367 The Theory and asia files now mention the 2015 book "The Global 2368 Transformation of Time, 1870-1950", and cite a couple of reviews. 2369 2370 The America/Chicago entry now documents the informal use of US 2371 central time in Fort Pierre, South Dakota. (Thanks to Rick 2372 McDermid, Matt Johnson, and Steve Jones.) 2373 2374 2375 Release 2015g - 2015-10-01 00:39:51 -0700 2376 2377 Changes affecting future timestamps 2378 2379 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 2380 (Thanks to Fatih.) 2381 2382 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 2383 (Thanks to Alexander Krivenyshev.) 2384 2385 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 2386 (Thanks to Ken Rylander.) 2387 2388 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 2389 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 2390 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 2391 2392 Changes affecting past timestamps 2393 2394 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 2395 2396 Changes affecting code 2397 2398 localtime no longer mishandles America/Anchorage after 2037. 2399 (Thanks to Bradley White for reporting the bug.) 2400 2401 On hosts with signed 32-bit time_t, localtime no longer mishandles 2402 Pacific/Fiji after 2038-01-16 14:00 UTC. 2403 2404 The localtime module allows the variables 'timezone', 'daylight', 2405 and 'altzone' to be in common storage shared with other modules, 2406 and declares them in case the system <time.h> does not. 2407 (Problems reported by Kees Dekker.) 2408 2409 On platforms with tm_zone, strftime.c now assumes it is not NULL. 2410 This simplifies the code and is consistent with zdump.c. 2411 (Problem reported by Christos Zoulas.) 2412 2413 Changes affecting documentation 2414 2415 The tzfile man page now documents that transition times denote the 2416 starts (not the ends) of the corresponding time periods. 2417 (Ambiguity reported by Bill Seymour.) 2418 2419 2420 Release 2015f - 2015-08-10 18:06:56 -0700 2421 2422 Changes affecting future timestamps 2423 2424 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 2425 The abbreviation remains "KST". (Thanks to Robert Elz.) 2426 2427 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 2428 and Pablo Camargo.) 2429 2430 Changes affecting past and future timestamps 2431 2432 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 2433 (Thanks to Roman Tudos.) 2434 2435 Changes affecting data format and code 2436 2437 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 2438 field of a Rule line should now be '-'; the old values 'even', 2439 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 2440 Although the implementation has not changed, these features do not 2441 work in the default installation, they are not used in the data, 2442 and they are now considered obsolescent. 2443 2444 zic now checks that two rules don't take effect at the same time. 2445 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 2446 simultaneity are now documented. 2447 2448 The two characters '%z' in a zone format now stand for the UT 2449 offset, e.g., '-07' for seven hours behind UT and '+0530' for 2450 five hours and thirty minutes ahead. This better supports time 2451 zone abbreviations conforming to POSIX.1-2001 and later. 2452 2453 Changes affecting installed data files 2454 2455 Comments for America/Halifax and America/Glace_Bay have been improved. 2456 (Thanks to Brian Inglis.) 2457 2458 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 2459 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 2460 installed data files for Europe/Simferopol and Europe/Tallinn. 2461 It does not affect timestamps. (Thanks to Howard Hinnant.) 2462 2463 Changes affecting code 2464 2465 zdump and zic no longer warn about valid time zone abbreviations 2466 like '-05'. 2467 2468 Some Visual Studio 2013 warnings have been suppressed. 2469 (Thanks to Kees Dekker.) 2470 2471 'date' no longer sets the time of day and its -a, -d, -n and -t 2472 options have been removed. Long obsolescent, the implementation 2473 of these features had porting problems. Builders no longer need 2474 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 2475 (Thanks to Kees Dekker for pointing out the problem.) 2476 2477 Changes affecting documentation 2478 2479 The Theory file mentions naming issues earlier, as these seem to be 2480 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 2481 2482 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 2483 2484 Mention that Herbert Samuel introduced the term "Summer Time". 2485 2486 2487 Release 2015e - 2015-06-13 10:56:02 -0700 2488 2489 Changes affecting future timestamps 2490 2491 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 2492 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 2493 2494 Assume Cayman Islands will observe DST starting next year, using US rules. 2495 Although it isn't guaranteed, it is the most likely. 2496 2497 Changes affecting data format 2498 2499 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 2500 spell the names of land Islands, Cte d'Ivoire, and Runion. 2501 2502 Changes affecting code 2503 2504 When displaying data, tzselect converts it to the current locale's 2505 encoding if the iconv command works. (Problem reported by random832.) 2506 2507 tzselect no longer mishandles Dominica, fixing a bug introduced 2508 in Release 2014f. (Problem reported by Owen Leibman.) 2509 2510 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 2511 This fixes a bug introduced in Release 2014f. 2512 (Problem reported by Leonardo Chiquitto.) 2513 2514 2515 Release 2015d - 2015-04-24 08:09:46 -0700 2516 2517 Changes affecting future timestamps 2518 2519 Egypt will not observe DST in 2015 and will consider canceling it 2520 permanently. For now, assume no DST indefinitely. 2521 (Thanks to Ahmed Nazmy and Tim Parenti.) 2522 2523 Changes affecting past timestamps 2524 2525 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 2526 1966-07-01. Also, Yukon's time zone history is documented better. 2527 (Thanks to Brian Inglis and Dennis Ferguson.) 2528 2529 Change affecting past and future time zone abbreviations 2530 2531 The abbreviations for Hawaii-Aleutian standard and daylight times 2532 have been changed from HAST/HADT to HST/HDT, as per US Government 2533 Printing Office style. This affects only America/Adak since 1983, 2534 as America/Honolulu was already using the new style. 2535 2536 Changes affecting code 2537 2538 zic has some minor performance improvements. 2539 2540 2541 Release 2015c - 2015-04-11 08:55:55 -0700 2542 2543 Changes affecting future timestamps 2544 2545 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 2546 not 00:00 on April's last Friday. 2015's transition will therefore be on 2547 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 2548 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 2549 2550 Changes affecting past timestamps 2551 2552 The following changes affect some pre-1991 Chile-related timestamps 2553 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 2554 2555 The 1910 transition was January 10, not January 1. 2556 2557 The 1918 transition was September 10, not September 1. 2558 2559 The UT -04 time observed from 1932 to 1942 is now considered to 2560 be standard time, not year-round DST. 2561 2562 Santiago observed DST (UT -03) from 1946-07-15 through 2563 1946-08-31, then reverted to standard time, then switched to -05 2564 on 1947-04-01. 2565 2566 Assume transitions before 1968 were at 00:00, since we have no data 2567 saying otherwise. 2568 2569 The spring 1988 transition was 1988-10-09, not 1988-10-02. 2570 The fall 1990 transition was 1990-03-11, not 1990-03-18. 2571 2572 Assume no UT offset change for Pacific/Easter on 1890-01-01, 2573 and omit all transitions on Pacific/Easter from 1942 through 1946 2574 since we have no data suggesting that they existed. 2575 2576 One more zone has been turned into a link, as it differed 2577 from an existing zone only for older timestamps. As usual, 2578 this change affects UT offsets in pre-1970 timestamps only. 2579 The zone's old contents have been moved to the 'backzone' file. 2580 The affected zone is America/Montreal. 2581 2582 Changes affecting commentary 2583 2584 Mention the TZUpdater tool. 2585 2586 Mention "The Time Now". (Thanks to Brandon Ramsey.) 2587 2588 2589 Release 2015b - 2015-03-19 23:28:11 -0700 2590 2591 Changes affecting future timestamps 2592 2593 Mongolia will start observing DST again this year, from the last 2594 Saturday in March at 02:00 to the last Saturday in September at 00:00. 2595 (Thanks to Ganbold Tsagaankhuu.) 2596 2597 Palestine will start DST on March 28, not March 27. Also, 2598 correct the fall 2014 transition from September 26 to October 24. 2599 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 2600 2601 Changes affecting past timestamps 2602 2603 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 2604 regression. (Thanks to Stuart Bishop for reporting the problem.) 2605 2606 Some more zones have been turned into links, when they differed 2607 from existing zones only for older timestamps. As usual, 2608 these changes affect UT offsets in pre-1970 timestamps only. 2609 Their old contents have been moved to the 'backzone' file. 2610 The affected zones are: America/Antigua, America/Cayman, 2611 Pacific/Midway, and Pacific/Saipan. 2612 2613 Changes affecting time zone abbreviations 2614 2615 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 2616 (Thanks to Hank W.) 2617 2618 Changes affecting code 2619 2620 Fix integer overflow bug in reference 'mktime' implementation. 2621 (Problem reported by Jrg Richter.) 2622 2623 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 2624 to be used in the same executable as standard-library time_t functions. 2625 (Problems reported by Bradley White.) 2626 2627 Changes affecting commentary 2628 2629 Cite the recent Mexican decree changing Quintana Roo's time zone. 2630 (Thanks to Carlos Ral Perasso.) 2631 2632 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 2633 2634 Update info about Mars time. 2635 2636 2637 Release 2015a - 2015-01-29 22:35:20 -0800 2638 2639 Changes affecting future timestamps 2640 2641 The Mexican state of Quintana Roo, represented by America/Cancun, 2642 will shift from Central Time with DST to Eastern Time without DST 2643 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 2644 2645 Chile will not change clocks in April or thereafter; its new standard time 2646 will be its old daylight saving time. This affects America/Santiago, 2647 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 2648 2649 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 2650 (Thanks to Tim Parenti.) 2651 2652 Changes affecting past timestamps 2653 2654 Iceland observed DST in 1919 and 1921, and its 1939 fallback 2655 transition was Oct. 29, not Nov. 29. Remove incorrect data from 2656 Shanks about time in Iceland between 1837 and 1908. 2657 2658 Some more zones have been turned into links, when they differed 2659 from existing zones only for older timestamps. As usual, 2660 these changes affect UT offsets in pre-1970 timestamps only. 2661 Their old contents have been moved to the 'backzone' file. 2662 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 2663 and Asia/Muscat. 2664 2665 Changes affecting code 2666 2667 tzalloc now scrubs time zone abbreviations compatibly with the way 2668 that tzset always has, by replacing invalid bytes with '_' and by 2669 shortening too-long abbreviations. 2670 2671 tzselect ports to POSIX awk implementations, no longer mishandles 2672 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 2673 settings to the user. (Thanks to Stefan Kuhn.) 2674 2675 Changes affecting build procedure 2676 2677 'make check' now checks for links to links in the data. 2678 One such link (for Africa/Asmera) has been fixed. 2679 (Thanks to Stephen Colebourne for pointing out the problem.) 2680 2681 Changes affecting commentary 2682 2683 The leapseconds file commentary now mentions the expiration date. 2684 (Problem reported by Martin Burnicki.) 2685 2686 Update Mexican Library of Congress URL. 2687 2688 2689 Release 2014j - 2014-11-10 17:37:11 -0800 2690 2691 Changes affecting current and future timestamps 2692 2693 Turks & Caicos' switch from US eastern time to UT -04 year-round 2694 did not occur on 2014-11-02 at 02:00. It's currently scheduled 2695 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 2696 2697 Changes affecting past timestamps 2698 2699 Many pre-1989 timestamps have been corrected for Asia/Seoul and 2700 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 2701 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 2702 longer guess that Pyongyang mimicked Seoul time after World War II, 2703 as this is politically implausible. 2704 2705 Some more zones have been turned into links, when they differed 2706 from existing zones only for older timestamps. As usual, 2707 these changes affect UT offsets in pre-1970 timestamps only. 2708 Their old contents have been moved to the 'backzone' file. 2709 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 2710 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 2711 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 2712 Indian/Mayotte. 2713 2714 Changes affecting commentary 2715 2716 The commentary is less enthusiastic about Shanks as a source, 2717 and is more careful to distinguish UT from UTC. 2718 2719 2720 Release 2014i - 2014-10-21 22:04:57 -0700 2721 2722 Changes affecting future timestamps 2723 2724 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 2725 (Thanks to Ken Rylander for the heads-up.) Guess that future 2726 years will use a similar pattern. 2727 2728 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 2729 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 2730 (Thanks to Kiley Walbom for the heads-up.) 2731 2732 Changes affecting time zone abbreviations 2733 2734 Since Belarus is not changing its clocks even though Moscow is, 2735 the time zone abbreviation in Europe/Minsk is changing from FET 2736 to its more-traditional value MSK on 2014-10-26 at 01:00. 2737 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 2738 2739 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 2740 Indochina, to distinguish it better from ICT (+07). 2741 2742 Changes affecting past timestamps 2743 2744 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 2745 (thanks to Trn Ngc Qun for an indirect pointer to Trn Tin Bnh's 2746 authoritative book). Asia/Ho_Chi_Minh has been added to 2747 zone1970.tab, to give tzselect users in Vietnam two choices, 2748 since north and south Vietnam disagreed after our 1970 cutoff. 2749 2750 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 2751 they differed from existing zones only for older timestamps. As 2752 usual, these changes affect pre-1970 timestamps only. Their old 2753 contents have been moved to the 'backzone' file. 2754 2755 Changes affecting code 2756 2757 The time-related library functions now set errno on failure, and 2758 some crashes in the new tzalloc-related library functions have 2759 been fixed. (Thanks to Christos Zoulas for reporting most of 2760 these problems and for suggesting fixes.) 2761 2762 If USG_COMPAT is defined and the requested timestamp is standard time, 2763 the tz library's localtime and mktime functions now set the extern 2764 variable timezone to a value appropriate for that timestamp; and 2765 similarly for ALTZONE, daylight saving time, and the altzone variable. 2766 This change is a companion to the tzname change in 2014h, and is 2767 designed to make timezone and altzone more compatible with tzname. 2768 2769 The tz library's functions now set errno to EOVERFLOW if they fail 2770 because the result cannot be represented. ctime and ctime_r now 2771 return NULL and set errno when a timestamp is out of range, rather 2772 than having undefined behavior. 2773 2774 Some bugs associated with the new 2014g functions have been fixed. 2775 This includes a bug that largely incapacitated the new functions 2776 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 2777 It also includes some uses of uninitialized variables after tzalloc. 2778 The new code uses the standard type 'ssize_t', which the Makefile 2779 now gives porting advice about. 2780 2781 Changes affecting commentary 2782 2783 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 2784 2785 2786 Release 2014h - 2014-09-25 18:59:03 -0700 2787 2788 Changes affecting past timestamps 2789 2790 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 2791 2792 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 2793 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 2794 2795 Some more zones have been turned into links, when they differed 2796 from existing zones only for older timestamps. As usual, 2797 these changes affect UT offsets in pre-1970 timestamps only. 2798 Their old contents have been moved to the 'backzone' file. 2799 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 2800 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 2801 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 2802 2803 Changes affecting code 2804 2805 zdump -V and -v now output gmtoff= values on all platforms, 2806 not merely on platforms defining TM_GMTOFF. 2807 2808 The tz library's localtime and mktime functions now set tzname to a value 2809 appropriate for the requested timestamp, and zdump now uses this 2810 on platforms not defining TM_ZONE, fixing a 2014g regression. 2811 (Thanks to Tim Parenti for reporting the problem.) 2812 2813 The tz library no longer sets tzname if localtime or mktime fails. 2814 2815 zdump -c no longer mishandles transitions near year boundaries. 2816 (Thanks to Tim Parenti for reporting the problem.) 2817 2818 An access to uninitialized data has been fixed. 2819 (Thanks to Jrg Richter for reporting the problem.) 2820 2821 When THREAD_SAFE is defined, the code ports to the C11 memory model. 2822 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 2823 and two threads race to initialize data used by gmtime-like functions. 2824 (Thanks to Andy Heninger for reporting the problems.) 2825 2826 Changes affecting build procedure 2827 2828 'make check' now checks better for properly-sorted data. 2829 2830 Changes affecting documentation and commentary 2831 2832 zdump's gmtoff=N output is now documented, and its isdst=D output 2833 is now documented to possibly output D values other than 0 or 1. 2834 2835 zdump -c's treatment of years is now documented to use the 2836 Gregorian calendar and Universal Time without leap seconds, 2837 and its behavior at cutoff boundaries is now documented better. 2838 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 2839 2840 Programs are now documented to use the proleptic Gregorian calendar. 2841 (Thanks to Alan Barrett for the suggestion.) 2842 2843 Fractional-second GMT offsets have been documented for civil time 2844 in 19th-century Chennai, Jakarta, and New York. 2845 2846 2847 Release 2014g - 2014-08-28 12:31:23 -0700 2848 2849 Changes affecting future timestamps 2850 2851 Turks & Caicos is switching from US eastern time to UT -04 2852 year-round, modeled as a switch on 2014-11-02 at 02:00. 2853 [As noted in 2014j, this switch was later delayed.] 2854 2855 Changes affecting past timestamps 2856 2857 Time in Russia or the USSR before 1926 or so has been corrected by 2858 a few seconds in the following zones: Asia/Irkutsk, 2859 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 2860 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 2861 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 2862 Vladimir Karpinsky.) 2863 2864 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 2865 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 2866 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 2867 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 2868 (Thanks to Stephen Colebourne for pointing to the decree.) 2869 2870 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 2871 2872 A new file 'backzone' contains data which may appeal to 2873 connoisseurs of old timestamps, although it is out of scope for 2874 the tz database, is often poorly sourced, and contains some data 2875 that is known to be incorrect. The new file is not recommended 2876 for ordinary use and its entries are not installed by default. 2877 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 2878 Isle of Man entries.) 2879 2880 Some more zones have been turned into links, when they differed 2881 from existing zones only for older timestamps. As usual, 2882 these changes affect UT offsets in pre-1970 timestamps only. 2883 Their old contents have been moved to the 'backzone' file. 2884 The affected zones are: Africa/Bangui, Africa/Brazzaville, 2885 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 2886 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 2887 2888 Changes affecting code 2889 2890 Unless NETBSD_INSPIRED is defined to 0, the tz library now 2891 supplies functions for creating and using objects that represent 2892 timezones. The new functions are tzalloc, tzfree, localtime_rz, 2893 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 2894 time2posix_z. They are intended for performance: for example, 2895 localtime_rz (unlike localtime_r) is trivially thread-safe without 2896 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 2897 functions, and to Alan Barrett and Jonathan Lennox for helping to 2898 debug the change.) 2899 2900 zdump now builds with the tz library unless USE_LTZ is defined to 0, 2901 This lets zdump use tz features even if the system library lacks them. 2902 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 2903 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 2904 2905 zdump now uses localtime_rz if available, as it's significantly faster, 2906 and it can help zdump better diagnose invalid timezone names. 2907 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 2908 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 2909 not available, zdump now uses localtime_r and tzset if available, 2910 as this is a bit cleaner and faster than plain localtime. Compile 2911 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 2912 lacks these two functions. 2913 2914 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 2915 Although not needed for tz's own applications, which are single-threaded, 2916 this supports POSIX better if the tz library is used in multithreaded apps. 2917 2918 Some crashes have been fixed when zdump or the tz library is given 2919 invalid or outlandish input. 2920 2921 The tz library no longer mishandles leap seconds on platforms with 2922 unsigned time_t in timezones that lack ordinary transitions after 1970. 2923 2924 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 2925 already defined, to make it easier to configure on common platforms. 2926 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 2927 2928 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 2929 assumes that reading uninitialized memory yields garbage values 2930 but does not cause other problems such as traps. 2931 2932 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 2933 more likely to guess right for ambiguous timestamps near 2934 transitions where tm_isdst does not change. 2935 2936 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 2937 strftime_l for compatibility with recent versions of POSIX. 2938 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 2939 to 1 on recent POSIX versions, and to 0 otherwise. 2940 2941 tzselect -c now uses a hybrid distance measure that works better 2942 in Africa. (Thanks to Alan Barrett for noting the problem.) 2943 2944 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 2945 or when time_tz is defined. 2946 2947 When HAVE_UTMPX_H is set the 'date' command now builds on systems 2948 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 2949 the date it updates the wtmpx file if _PATH_WTMPX is defined. 2950 This affects GNU/Linux and similar systems. 2951 2952 For easier maintenance later, some C code has been simplified, 2953 some lint has been removed, and the code has been tweaked so that 2954 plain 'make' is more likely to work. 2955 2956 The C type 'bool' is now used for boolean values, instead of 'int'. 2957 2958 The long-obsolete LOCALE_HOME code has been removed. 2959 2960 The long-obsolete 'gtime' function has been removed. 2961 2962 Changes affecting build procedure 2963 2964 'zdump' no longer links in ialloc.o, as it's not needed. 2965 2966 'make check_time_t_alternatives' no longer assumes GNU diff. 2967 2968 Changes affecting distribution tarballs 2969 2970 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 2971 the tzdata tarball instead of the tzcode tarball, since they help 2972 maintain the data. The NEWS and Theory files are now also 2973 distributed in the tzdata tarball, as they're relevant for data. 2974 (Thanks to Alan Barrett for pointing this out.) Also, the 2975 leapseconds.awk file is no longer distributed in the tzcode 2976 tarball, since it belongs in the tzdata tarball (where 2014f 2977 inadvertently also distributed it). 2978 2979 Changes affecting documentation and commentary 2980 2981 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 2982 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 2983 for debugging it.) 2984 2985 The man pages have been updated to use function prototypes, 2986 to document thread-safe variants like localtime_r, and to document 2987 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 2988 mktime_z. 2989 2990 The fields in Link lines have been renamed to be more descriptive 2991 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 2992 and LINK-TO has become LINK-NAME. 2993 2994 tz-link.htm mentions the IETF's tzdist working group; Windows 2995 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 2996 2997 Some broken URLs have been fixed in the commentary. (Thanks to 2998 Lester Caine.) 2999 3000 Commentary about Philippines DST has been updated, and commentary 3001 on pre-1970 time in India has been added. 3002 3003 3004 Release 2014f - 2014-08-05 17:42:36 -0700 3005 3006 Changes affecting future timestamps 3007 3008 Russia will subtract an hour from most of its time zones on 2014-10-26 3009 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 3010 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 3011 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 3012 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 3013 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 3014 (Europe/Samara) are not changing their clocks. The changed zones are 3015 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 3016 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 3017 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 3018 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 3019 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 3020 but not its UTC offset. Two zones are added: Asia/Chita (split 3021 from Asia/Yakutsk, and also with two hours subtracted) and 3022 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 3023 subtracted). (Thanks to Tim Parenti for much of the above.) 3024 3025 Changes affecting time zone abbreviations 3026 3027 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 3028 and similarly for the other Australian zones. That is, for eastern 3029 standard and daylight saving time the abbreviations are AEST and AEDT 3030 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 3031 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 3032 This change does not affect UT offsets, only time zone abbreviations. 3033 (Thanks to Rich Tibbett and many others.) 3034 3035 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 3036 effective 2014-10-26 at 02:00 local time. 3037 3038 The time zone abbreviation for Xinjiang Time (observed in rmqi) 3039 has been changed from URUT to XJT. (Thanks to Luther Ma.) 3040 3041 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 3042 Similarly, prefer EET/EEST for eastern European time in Russia. 3043 3044 Change time zone abbreviations in (western) Samoa to use "ST" and 3045 "DT" suffixes, as this is more likely to match common practice. 3046 Prefix "W" to (western) Samoa time when its standard-time offset 3047 disagrees with that of American Samoa. 3048 3049 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 3050 3051 Time zone abbreviations have been updated for Japan's two time 3052 zones used 1896-1937. JWST now stands for Western Standard 3053 Time, and JCST for Central Standard Time (formerly this was CJT). 3054 These abbreviations are now used for time in Korea, Taiwan, 3055 and Sakhalin while controlled by Japan. 3056 3057 Changes affecting past timestamps 3058 3059 China's five zones have been simplified to two, since the post-1970 3060 differences in the other three seem to have been imaginary. The 3061 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 3062 removed; backwards-compatibility links still work, albeit with 3063 different behaviors for timestamps before May 1980. Asia/Urumqi's 3064 1980 transition to UT +08 has been removed, so that it is now at 3065 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 3066 Treindl sent helpful translations of two papers by Guo Qingsheng.) 3067 3068 Some zones have been turned into links, when they differed from existing 3069 zones only for older UT offsets where data entries were likely invented. 3070 These changes affect UT offsets in pre-1970 timestamps only. This is 3071 similar to the change in release 2013e, except this time for western 3072 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 3073 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 3074 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 3075 Atlantic/St_Helena. This also affects the backwards-compatibility 3076 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 3077 Tim Parenti, and David Patte for reporting problems in earlier 3078 versions of this change.) 3079 3080 Asia/Shanghai's pre-standard-time UT offset has been changed from 3081 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 3082 transition to standard time has been changed from 1928 to 1901. 3083 3084 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 3085 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 3086 In 1946 it observed DST from 05-15 through 09-30; in 1947 3087 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 3088 (Thanks to Yu-Cheng Chuang.) 3089 3090 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 3091 3092 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 3093 10-03 at 00:00. (Thanks to Konstantin Hyppnen.) 3094 3095 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 3096 period from 1911 to 1950. 3097 3098 Pacific/Chatham has been changed to New Zealand standard time plus 3099 45 minutes for the period before 1957, reflecting a 1956 remark in 3100 the New Zealand parliament. 3101 3102 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 3103 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 3104 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 3105 not 04-06 at 02:00; and there was no DST in 1920. 3106 3107 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 3108 3109 Time in Russia before 1927 or so has been corrected by a few seconds in 3110 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 3111 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 3112 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 3113 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 3114 3115 Changes affecting data format 3116 3117 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 3118 The new file's extended format allows multiple country codes per zone. 3119 The older file is still installed but is deprecated; its format is 3120 not changing and it will still be distributed for a while, but new 3121 applications should use the new file. 3122 3123 The new file format simplifies maintenance of obscure locations. 3124 To test this, it adds coverage for the Crozet Islands and the 3125 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 3126 3127 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 3128 It is still ASCII now, but commentary about the switch has been added. 3129 The new file 'zone1970.tab' already uses UTF-8. 3130 3131 Changes affecting code 3132 3133 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 3134 is defined. (Thanks to Elliott Hughes for reporting the problem.) 3135 3136 'zic' no longer mishandles input when ignoring case in locales that 3137 are not compatible with English, e.g., unibyte Turkish locales when 3138 compiled with HAVE_GETTEXT. 3139 3140 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 3141 they no longer use ASCII '-' as if it were a dash. 3142 3143 'zic' now rejects output file names that contain '.' or '..' components. 3144 (Thanks to Tim Parenti for reporting the problem.) 3145 3146 'zic -v' now warns about output file names that do not follow 3147 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 3148 David Olson for starting the ball rolling on this.) 3149 3150 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 3151 3152 Changes affecting build procedure 3153 3154 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 3155 (Thanks to John Cochran.) 3156 3157 Changes affecting documentation and commentary 3158 3159 The 'Theory' file documents legacy names, the longstanding 3160 exceptions to the POSIX-inspired file name rules. 3161 3162 The 'zic' documentation clarifies the role of time types when 3163 interpreting dates. (Thanks to Arthur David Olson.) 3164 3165 Documentation and commentary now prefer UTF-8 to US-ASCII, 3166 allowing the use of proper accents in foreign words and names. 3167 Code and data have not changed because of this. (Thanks to 3168 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 3169 this.) 3170 3171 Non-HTML documentation and commentary now use plain-text URLs instead of 3172 HTML insertions, and are more consistent about bracketing URLs when they 3173 are not already surrounded by white space. (Thanks to suggestions by 3174 Steffen Nurpmeso.) 3175 3176 There is new commentary about Xujiahui Observatory, the five time-zone 3177 project in China from 1918 to 1949, timekeeping in Japanese-occupied 3178 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 3179 warlord Jin Shuren in the data. 3180 3181 Commentary about the coverage of each Russian zone has been standardized. 3182 (Thanks to Tim Parenti.) 3183 3184 There is new commentary about contemporary timekeeping in Ethiopia. 3185 3186 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 3187 3188 There is new commentary about time in Poland in 1919. 3189 3190 Proper credit has been given to DST inventor George Vernon Hudson. 3191 3192 Commentary about time in Metlakatla, AK and Resolute, NU has been 3193 improved, with a new source for the former. 3194 3195 In zone.tab, Pacific/Easter no longer mentions Salas y Gmez, as it 3196 is uninhabited. 3197 3198 Commentary about permanent Antarctic bases has been updated. 3199 3200 Several typos have been corrected. (Thanks to Tim Parenti for 3201 contributing some of these fixes.) 3202 3203 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 3204 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 3205 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 3206 (Thanks to a heads-up from Dirkjan Ochtman.) 3207 3208 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 3209 have been removed. These obsolescent US Naval Observatory entries were no 3210 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 3211 3212 3213 Release 2014e - 2014-06-12 21:53:52 -0700 3214 3215 Changes affecting near-future timestamps 3216 3217 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 3218 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 3219 switch to standard time at 24:00 the last Thursday before Ramadan, and 3220 back to DST at 00:00 the first Friday after Ramadan. 3221 3222 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 3223 to Milamber Space Network.) Guess that from 2015 on Morocco will 3224 temporarily switch to standard time at 03:00 the last Saturday before 3225 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 3226 3227 Changes affecting past timestamps 3228 3229 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 3230 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 3231 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 3232 in 1991. (Thanks to Hank W. for reporting the problems.) 3233 3234 Changes affecting commentary 3235 3236 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 3237 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 3238 removes stale pointers to World Time Explorer and WORLDTIME. 3239 3240 3241 Release 2014d - 2014-05-27 21:34:40 -0700 3242 3243 Changes affecting code 3244 3245 zic no longer generates files containing timestamps before the Big Bang. 3246 This works around GNOME glib bug 878 3247 <https://gitlab.gnome.org/GNOME/glib/issues/878> 3248 (Thanks to Leonardo Chiquitto for reporting the bug, and to 3249 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 3250 3251 Changes affecting documentation 3252 3253 tz-link.htm now mentions GNOME. 3254 3255 3256 Release 2014c - 2014-05-13 07:44:13 -0700 3257 3258 Changes affecting near-future timestamps 3259 3260 Egypt observes DST starting 2014-05-15 at 24:00. 3261 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 3262 Details have not been announced, except that DST will not be observed 3263 during Ramadan. Guess that DST will stop during the same Ramadan dates as 3264 Morocco, and that Egypt's future spring and fall transitions will be the 3265 same as 2010 when it last observed DST, namely April's last Friday at 3266 00:00 to September's last Thursday at 23:00 standard time. Also, guess 3267 that Ramadan transitions will be at 00:00 standard time. 3268 3269 Changes affecting code 3270 3271 zic now generates transitions for minimum time values, eliminating guesswork 3272 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 3273 3274 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 3275 3276 Changes affecting commentary and documentation 3277 3278 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 3279 3280 3281 Release 2014b - 2014-03-24 21:28:50 -0700 3282 3283 Changes affecting near-future timestamps 3284 3285 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 3286 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 3287 3288 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 3289 Bengt-Inge Larsson.) This is currently an approximation; a better version 3290 will require the zic and localtime fixes mentioned below, and the plan is 3291 to wait for a while until at least the zic fixes propagate. 3292 3293 Changes affecting code 3294 3295 'zic' and 'localtime' no longer reject locations needing four transitions 3296 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 3297 Also, 'zic' avoids some unlikely failures due to integer overflow. 3298 3299 Changes affecting build procedure 3300 3301 'make check' now detects Rule lines defined but never used. 3302 The NZAQ rules, an instance of this problem, have been removed. 3303 3304 Changes affecting commentary and documentation 3305 3306 Fix Tuesday/Thursday typo in description of time in Israel. 3307 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 3308 3309 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 3310 to Donald MacQueen.) Instead, the Microsoft Windows Store app 3311 library supports them. 3312 3313 Add comments about Johnston Island time in the 1960s. 3314 (Thanks to Lyle McElhaney.) 3315 3316 Morocco's 2014 DST start will be as predicted. 3317 (Thanks to Sebastien Willemijns.) 3318 3319 3320 Release 2014a - 2014-03-07 23:30:29 -0800 3321 3322 Changes affecting near-future timestamps 3323 3324 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 3325 the heads-up, and to Tim Parenti for simplifying the update.) 3326 3327 Changes affecting past timestamps 3328 3329 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00. 3330 (Thanks to Steffen Thorsen.) 3331 3332 Ukraine switched from Moscow to Eastern European time on 1990-07-01 3333 (not 1992-01-01), and observed DST during the entire next winter. 3334 (Thanks to Vladimir in Moscow via Alois Treindl.) 3335 3336 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 3337 (Thanks to Avigdor Finkelstein.) 3338 3339 Changes affecting code 3340 3341 A uninitialized-storage bug in 'localtime' has been fixed. 3342 (Thanks to Logan Chien.) 3343 3344 Changes affecting the build procedure 3345 3346 The settings for 'make check_web' now default to Ubuntu 13.10. 3347 3348 Changes affecting commentary and documentation 3349 3350 The boundary of the US Pacific time zone is given more accurately. 3351 (Thanks to Alan Mintz.) 3352 3353 Chile's 2014 DST will be as predicted. (Thanks to Jos Miguel Garrido.) 3354 3355 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Ral Perasso.) 3356 3357 Better descriptions of countries with same time zone history as 3358 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 3359 3360 Several changes affect tz-link.htm, the main web page. 3361 3362 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 3363 David Braverman). 3364 3365 Mention xCal (Internet RFC 6321) and jCal. 3366 3367 Microsoft has some support for tz database names. 3368 3369 CLDR data formats include both XML and JSON. 3370 3371 Mention Maggiolo's map of solar vs standard time. 3372 (Thanks to Arthur David Olson.) 3373 3374 Mention TZ4Net. (Thanks to Matt Johnson.) 3375 3376 Mention the timezone-olson Haskell package. 3377 3378 Mention zeitverschiebung.net. (Thanks to Martin Jger.) 3379 3380 Remove moribund links to daylight-savings-time.info and to 3381 Simple Timer + Clocks. 3382 3383 Update two links. (Thanks to Oscar van Vlijmen.) 3384 3385 Fix some formatting glitches, e.g., remove random newlines from 3386 abbr elements' title attributes. 3387 3388 3389 Release 2013i - 2013-12-17 07:25:23 -0800 3390 3391 Changes affecting near-future timestamps: 3392 3393 Jordan switches back to standard time at 00:00 on December 20, 2013. 3394 The 2006-2011 transition schedule is planned to resume in 2014. 3395 (Thanks to Steffen Thorsen.) 3396 3397 Changes affecting past timestamps: 3398 3399 In 2004, Cuba began DST on March 28, not April 4. 3400 (Thanks to Steffen Thorsen.) 3401 3402 Changes affecting code 3403 3404 The compile-time flag NOSOLAR has been removed, as nowadays the 3405 benefit of slightly shrinking runtime table size is outweighed by the 3406 cost of disallowing potential future updates that exceed old limits. 3407 3408 Changes affecting documentation and commentary 3409 3410 The files solar87, solar88, and solar89 are no longer distributed. 3411 They were a negative experiment - that is, a demonstration that 3412 tz data can represent solar time only with some difficulty and error. 3413 Their presence in the distribution caused confusion, as Riyadh 3414 civil time was generally not solar time in those years. 3415 3416 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 3417 3418 3419 Release 2013h - 2013-10-25 15:32:32 -0700 3420 3421 Changes affecting current and future timestamps: 3422 3423 Libya has switched its UT offset back to +02 without DST, instead 3424 of +01 with DST. (Thanks to Even Scharning.) 3425 3426 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 3427 (Thanks to Gwillim Law.) 3428 3429 Changes affecting future timestamps: 3430 3431 Acre and (we guess) western Amazonas will switch from UT -04 to -05 3432 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 3433 (Thanks to Steffen Thorsen.) 3434 3435 Add entries for DST transitions in Morocco in the year 2038. 3436 This avoids some year-2038 glitches introduced in 2013g. 3437 (Thanks to Yoshito Umaoka for reporting the problem.) 3438 3439 Changes affecting API 3440 3441 The 'tzselect' command no longer requires the 'select' command, 3442 and should now work with /bin/sh on more platforms. It also works 3443 around a bug in BusyBox awk before version 1.21.0. (Thanks to 3444 Patrick 'P. J.' McDermott and Alan Barrett.) 3445 3446 Changes affecting code 3447 3448 Fix localtime overflow bugs with 32-bit unsigned time_t. 3449 3450 zdump no longer assumes sscanf returns maximal values on overflow. 3451 3452 Changes affecting the build procedure 3453 3454 The builder can specify which programs to use, if any, instead of 3455 'ar' and 'ranlib', and libtz.a is now built locally before being 3456 installed. (Thanks to Michael Forney.) 3457 3458 A dependency typo in the 'zdump' rule has been fixed. 3459 (Thanks to Andrew Paprocki.) 3460 3461 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 3462 work as specified by POSIX.2-1992 or later; this is portable nowadays. 3463 3464 'make clean' no longer removes 'leapseconds', since it's 3465 host-independent and is part of the distribution. 3466 3467 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 3468 3469 Changes affecting documentation and commentary 3470 3471 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 3472 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 3473 3474 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 3475 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 3476 longer maintained) and for old advisories. SOFA now does C. 3477 3478 Release 2013g - 2013-09-30 21:08:26 -0700 3479 3480 Changes affecting current and near-future timestamps 3481 3482 Morocco now observes DST from the last Sunday in March to the last 3483 Sunday in October, not April to September respectively. (Thanks 3484 to Steffen Thorsen.) 3485 3486 Changes affecting 'zic' 3487 3488 'zic' now runs on platforms that lack both hard links and symlinks. 3489 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 3490 Also, fix some bugs on platforms that lack hard links but have symlinks. 3491 3492 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 3493 to predict the far future, fixing a bug introduced in 2013e. 3494 3495 Changes affecting the build procedure 3496 3497 The 'leapseconds' file is again put into the tzdata tarball. 3498 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 3499 Matt Burgess and Ian Abbott.) The timestamps of these and other 3500 dependent files in tarballs are adjusted more consistently. 3501 3502 Changes affecting documentation and commentary 3503 3504 The README file is now part of the data tarball as well as the code. 3505 It now states that files are public domain unless otherwise specified. 3506 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 3507 Its details about the 1989 release moved to a place of honor near 3508 the end of NEWS. 3509 3510 3511 Release 2013f - 2013-09-24 23:37:36 -0700 3512 3513 Changes affecting near-future timestamps 3514 3515 Tocantins will very likely not observe DST starting this spring. 3516 (Thanks to Steffen Thorsen.) 3517 3518 Jordan will likely stay at UT +03 indefinitely, and will not fall 3519 back this fall. 3520 3521 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 3522 3523 Changes affecting API 3524 3525 The types of the global variables 'timezone' and 'altzone' (if present) 3526 have been changed back to 'long'. This is required for 'timezone' 3527 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 3528 These variables were originally 'long' in the tz code, but were 3529 mistakenly changed to 'time_t' in 1987; nobody reported the 3530 incompatibility until now. The difference matters on x32, where 3531 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 3532 3533 Changes affecting the build procedure 3534 3535 Avoid long strings in leapseconds.awk to work around a mawk bug. 3536 (Thanks to Cyril Baurand.) 3537 3538 Changes affecting documentation and commentary 3539 3540 New file 'NEWS' that contains release notes like this one. 3541 3542 Paraguay's law does not specify DST transition time; 00:00 is customary. 3543 (Thanks to Waldemar Villamayor-Venialbo.) 3544 3545 Minor capitalization fixes. 3546 3547 Changes affecting version-control only 3548 3549 The experimental GitHub repository now contains annotated and 3550 signed tags for recent releases, e.g., '2013e' for Release 2013e. 3551 Releases are tagged starting with 2012e; earlier releases were 3552 done differently, and tags would either not have a simple name or 3553 not exactly match what was released. 3554 3555 'make set-timestamps' is now simpler and a bit more portable. 3556 3557 3558 Release 2013e - 2013-09-19 23:50:04 -0700 3559 3560 Changes affecting near-future timestamps 3561 3562 This year Fiji will start DST on October 27, not October 20. 3563 (Thanks to David Wheeler for the heads-up.) For now, guess that 3564 Fiji will continue to spring forward the Sunday before the fourth 3565 Monday in October. 3566 3567 Changes affecting current and future time zone abbreviations 3568 3569 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 3570 time zone abbreviations since 1932. (Thanks to George Ziegler, 3571 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 3572 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 3573 Asia/Makassar, and Asia/Pontianak. 3574 3575 Use ART (UT -03, standard time), rather than WARST (also -03, but 3576 daylight saving time) for San Luis, Argentina since 2009. 3577 3578 Changes affecting Godthb timestamps after 2037 if version mismatch 3579 3580 Allow POSIX-like TZ strings where the transition time's hour can 3581 range from -167 through 167, instead of the POSIX-required 0 3582 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 3583 new Fiji rules. This is a more-compact way to represent 3584 far-future timestamps for America/Godthab, America/Santiago, 3585 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 3586 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 3587 this change. (Derived from a suggestion by Arthur David Olson.) 3588 3589 Allow POSIX-like TZ strings where daylight saving time is in 3590 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 3591 Argentina Summer Time all year. This supports a more-compact way 3592 to represent the 2013d data for America/Argentina/San_Luis. 3593 Because of the change for San Luis noted above this change does not 3594 affect the current data. (Thanks to Andrew Main (Zefram) for 3595 suggestions that improved this change.) 3596 3597 Where these two TZ changes take effect, there is a minor extension 3598 to the tz file format in that it allows new values for the 3599 embedded TZ-format string, and the tz file format version number 3600 has therefore been increased from 2 to 3 as a precaution. 3601 Version-2-based client code should continue to work as before for 3602 all timestamps before 2038. Existing version-2-based client code 3603 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 3604 files, and typically works in practice even for timestamps after 3605 2037; the only known exception is America/Godthab. 3606 3607 Changes affecting timestamps before 1970 3608 3609 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 3610 some errors before 1947. 3611 3612 Some zones have been turned into links, when they differ from existing 3613 zones only in older data entries that were likely invented or that 3614 differ only in LMT or transitions from LMT. These changes affect 3615 only timestamps before 1943. The affected zones are: 3616 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 3617 America/Grenada, America/Guadeloupe, America/Marigot, 3618 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 3619 America/St_Lucia, America/St_Thomas, America/St_Vincent, 3620 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 3621 confirming that the old Europe/Vaduz zone was wrong and the new 3622 link is better for WWII-era times.) 3623 3624 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 3625 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 3626 from 1890 to 1912. 3627 3628 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 3629 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 3630 to Alois Treindl.) 3631 3632 Change the date of the circa-1850 Zurich transition from 1849-09-12 3633 to 1853-07-16, overriding Shanks with data from Messerli about 3634 postal and telegraph time in Switzerland. 3635 3636 Changes affecting time zone abbreviations before 1970 3637 3638 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 3639 as Jakarta was called Batavia back then. 3640 3641 Changes affecting API 3642 3643 The 'zic' command now outputs a dummy transition when far-future 3644 data can't be summarized using a TZ string, and uses a 402-year 3645 window rather than a 400-year window. For the current data, this 3646 affects only the Asia/Tehran file. It does not affect any of the 3647 timestamps that this file represents, so zdump outputs the same 3648 information as before. (Thanks to Andrew Main (Zefram).) 3649 3650 The 'date' command has a new '-r' option, which lets you specify 3651 the integer time to display, a la FreeBSD. 3652 3653 The 'tzselect' command has two new options '-c' and '-n', which lets you 3654 select a zone based on latitude and longitude. 3655 3656 The 'zic' command's '-v' option now warns about constructs that 3657 require the new version-3 binary file format. (Thanks to Arthur 3658 David Olson for the suggestion.) 3659 3660 Support for floating-point time_t has been removed. 3661 It was always dicey, and POSIX no longer requires it. 3662 (Thanks to Eric Blake for suggesting to the POSIX committee to 3663 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 3664 Heninger, Arthur David Olson, and Alois Treindl, for reporting 3665 bugs and elucidating some of the corners of the old floating-point 3666 implementation.) 3667 3668 The signatures of 'offtime', 'timeoff', and 'gtime' have been 3669 changed back to the old practice of using 'long' to represent UT 3670 offsets. This had been inadvertently and mistakenly changed to 3671 'int_fast32_t'. (Thanks to Christos Zoulas.) 3672 3673 The code avoids undefined behavior on integer overflow in some 3674 more places, including gmtime, localtime, mktime and zdump. 3675 3676 Changes affecting the zdump utility 3677 3678 zdump now outputs "UT" when referring to Universal Time, not "UTC". 3679 "UTC" does not make sense for timestamps that predate the introduction 3680 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen 3681 for clarifying UT vs UTC.) 3682 3683 Data changes affecting behavior of tzselect and similar programs 3684 3685 Country code BQ is now called the more-common name "Caribbean Netherlands" 3686 rather than the more-official "Bonaire, St Eustatius & Saba". 3687 3688 Remove from zone.tab the names America/Montreal, America/Shiprock, 3689 and Antarctica/South_Pole, as they are equivalent to existing 3690 same-country-code zones for post-1970 timestamps. The data entries for 3691 these names are unchanged, so the names continue to work as before. 3692 3693 Changes affecting code internals 3694 3695 zic -c now runs way faster on 64-bit hosts when given large numbers. 3696 3697 zic now uses vfprintf to avoid allocating and freeing some memory. 3698 3699 tzselect now computes the list of continents from the data, 3700 rather than have it hard-coded. 3701 3702 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 3703 3704 Changes affecting the build procedure 3705 3706 The 'leapseconds' file is now generated automatically from a 3707 new file 'leap-seconds.list', which is a copy of 3708 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 3709 A new source file 'leapseconds.awk' implements this. 3710 The goal is simplification of the future maintenance of 'leapseconds'. 3711 3712 When building the 'posix' or 'right' subdirectories, if the 3713 subdirectory would be a copy of the default subdirectory, it is 3714 now made a symbolic link if that is supported. This saves about 3715 2 MB of file system space. 3716 3717 The links America/Shiprock and Antarctica/South_Pole have been 3718 moved to the 'backward' file. This affects only nondefault builds 3719 that omit 'backward'. 3720 3721 Changes affecting version-control only 3722 3723 .gitignore now ignores 'date'. 3724 3725 Changes affecting documentation and commentary 3726 3727 Changes to the 'tzfile' man page 3728 3729 It now mentions that the binary file format may be extended in 3730 future versions by appending data. 3731 3732 It now refers to the 'zdump' and 'zic' man pages. 3733 3734 Changes to the 'zic' man page 3735 3736 It lists conditions that elicit a warning with '-v'. 3737 3738 It says that the behavior is unspecified when duplicate names 3739 are given, or if the source of one link is the target of another. 3740 3741 Its examples are updated to match the latest data. 3742 3743 The definition of white space has been clarified slightly. 3744 (Thanks to Michael Deckers.) 3745 3746 Changes to the 'Theory' file 3747 3748 There is a new section about the accuracy of the tz database, 3749 describing the many ways that errors can creep in, and 3750 explaining why so many of the pre-1970 timestamps are wrong or 3751 misleading (thanks to Steve Allen, Lester Caine, and Garrett 3752 Wollman for discussions that contributed to this). 3753 3754 The 'Theory' file describes LMT better (this follows a 3755 suggestion by Guy Harris). 3756 3757 It refers to the 2013 edition of POSIX rather than the 2004 edition. 3758 3759 It's mentioned that excluding 'backward' should not affect the 3760 other data, and it suggests at least one zone.tab name per 3761 inhabited country (thanks to Stephen Colebourne). 3762 3763 Some longstanding restrictions on names are documented, e.g., 3764 'America/New_York' precludes 'America/New_York/Bronx'. 3765 3766 It gives more reasons for the 1970 cutoff. 3767 3768 It now mentions which time_t variants are supported, such as 3769 signed integer time_t. (Thanks to Paul Goyette for reporting 3770 typos in an experimental version of this change.) 3771 3772 (Thanks to Philip Newton for correcting typos in these changes.) 3773 3774 Documentation and commentary is more careful to distinguish UT in 3775 general from UTC in particular. (Thanks to Steve Allen.) 3776 3777 Add a better source for the Zurich 1894 transition. 3778 (Thanks to Pierre-Yves Berger.) 3779 3780 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 3781 3782 3783 Release 2013d - 2013-07-05 07:38:01 -0700 3784 3785 Changes affecting future timestamps: 3786 3787 Morocco's midsummer transitions this year are July 7 and August 10, 3788 not July 9 and August 8. (Thanks to Andrew Paprocki.) 3789 3790 Israel now falls back on the last Sunday of October. 3791 (Thanks to Ephraim Silverberg.) 3792 3793 Changes affecting past timestamps: 3794 3795 Specify Jerusalem's location more precisely; this changes the pre-1880 3796 times by 2 s. 3797 3798 Changing affecting metadata only: 3799 3800 Fix typos in the entries for country codes BQ and SX. 3801 3802 Changes affecting code: 3803 3804 Rework the code to fix a bug with handling Australia/Macquarie on 3805 32-bit hosts (thanks to Arthur David Olson). 3806 3807 Port to platforms like NetBSD, where time_t can be wider than long. 3808 3809 Add support for testing time_t types other than the system's. 3810 Run 'make check_time_t_alternatives' to try this out. 3811 Currently, the tests fail for unsigned time_t; 3812 this should get fixed at some point. 3813 3814 Changes affecting documentation and commentary: 3815 3816 Deemphasize the significance of national borders. 3817 3818 Update the zdump man page. 3819 3820 Remove obsolete NOID comment (thanks to Denis Excoffier). 3821 3822 Update several URLs and comments in the web pages. 3823 3824 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 3825 3826 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 3827 3828 3829 Release 2013c - 2013-04-19 16:17:40 -0700 3830 3831 Changes affecting current and future timestamps: 3832 3833 Palestine observed DST starting March 29, 2013. (Thanks to 3834 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 3835 with the predicted rules being the last Thursday in March at 24:00 3836 to the first Friday on or after September 21 at 01:00. 3837 3838 Assume that the recent change to Paraguay's DST rules is permanent, 3839 by moving the end of DST to the 4th Sunday in March every year. 3840 (Thanks to Carlos Ral Perasso.) 3841 3842 Changes affecting past timestamps: 3843 3844 Fix some historical data for Palestine to agree with that of 3845 timeanddate.com, as follows: 3846 3847 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 3848 00:00 Apr 1. 3849 3850 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 3851 02:00. 3852 3853 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 3854 3855 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 3856 3857 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 3858 3859 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 3860 3861 Fix times of habitation for Macquarie to agree with the Tasmania 3862 Parks & Wildlife Service history, which indicates that permanent 3863 habitation was 1899-1919 and 1948 on. 3864 3865 Changing affecting metadata only: 3866 3867 Macquarie Island is politically part of Australia, not Antarctica. 3868 (Thanks to Tobias Conradi.) 3869 3870 Sort Macquarie more-consistently with other parts of Australia. 3871 (Thanks to Tim Parenti.) 3872 3873 3874 Release 2013b - 2013-03-10 22:33:40 -0700 3875 3876 Changes affecting current and future timestamps: 3877 3878 Haiti uses US daylight-saving rules this year, and presumably future years. 3879 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 3880 3881 Paraguay will end DST on March 24 this year. 3882 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 3883 3884 Morocco does not observe DST during Ramadan; 3885 try to predict Ramadan in Morocco as best we can. 3886 (Thanks to Erik Homoet for the heads-up.) 3887 3888 Changes affecting commentary: 3889 3890 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 3891 Update URL for Solaris. Mention Internet RFC 6557. 3892 Update Internet RFCs 2445->5545, 2822->5322. 3893 Switch from FTP to HTTP for Internet RFCs. 3894 3895 3896 Release 2013a - 2013-02-27 09:20:35 -0800 3897 3898 Change affecting binary data format: 3899 3900 The zone offset at the end of version-2-format zone files is now 3901 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 3902 3903 Changes affecting current and future timestamps: 3904 3905 Chile's 2013 rules, and we guess rules for 2014 and later, will be 3906 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 3907 (Thanks to Steffen Thorsen and Robert Elz.) 3908 3909 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 3910 (Thanks to Tobias Conradi and Arthur David Olson.) 3911 3912 Many changes affect historical timestamps before 1940. 3913 These were deduced from: Milne J. Civil time. Geogr J. 1899 3914 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 3915 3916 Changes affecting the code: 3917 3918 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 3919 the data). (Thanks to Arthur David Olson.) 3920 3921 Fix localtime bug when time_t is unsigned and data files were generated 3922 by a signed time_t system. (Thanks to Doug Bailey for reporting and 3923 to Arthur David Olson for fixing.) 3924 3925 Allow the email address for bug reports to be set by the packager. 3926 The default is tz (a] iana.org, as before. (Thanks to Joseph S. Myers.) 3927 3928 Update HTML checking to be compatible with Ubuntu 12.10. 3929 3930 Check that files are a safe subset of ASCII. At some point we may 3931 relax this requirement to a safe subset of UTF-8. Without the 3932 check, some non-UTF-8 encodings were leaking into the distribution. 3933 3934 Commentary changes: 3935 3936 Restore a comment about copyright notices that was inadvertently deleted. 3937 (Thanks to Arthur David Olson.) 3938 3939 Improve the commentary about which districts observe what times 3940 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 3941 3942 Add web page links to tz.js. 3943 3944 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 3945 3946 3947 Release 2012j - 2012-11-12 18:34:49 -0800 3948 3949 Libya moved to CET this weekend, but with DST planned next year. 3950 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 3951 3952 Signatures now have the extension .asc, not .sign, as that's more 3953 standard. (Thanks to Phil Pennock.) 3954 3955 The output of 'zdump --version', and of 'zic --version', now 3956 uses a format that is more typical for --version. 3957 (Thanks to Joseph S. Myers.) 3958 3959 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 3960 now uses tz (a] iana.org rather than the old elsie address. 3961 3962 zic -v now complains about abbreviations that are less than 3 3963 or more than 6 characters, as per Posix. Formerly, it checked 3964 for abbreviations that were more than 3. 3965 3966 'make public' no longer puts its temporary directory under /tmp, 3967 and uses the just-built zic rather than the system zic. 3968 3969 Various fixes to documentation and commentary. 3970 3971 3972 Release 2012i - 2012-11-03 12:57:09 -0700 3973 3974 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 3975 3976 Linker flags can now be specified via LDFLAGS. 3977 AWK now defaults to 'awk', not 'nawk'. 3978 The shell in tzselect now defaults to /bin/bash, but this can 3979 be overridden by specifying KSHELL. 3980 The main web page now mentions the unofficial GitHub repository. 3981 (Thanks to Mike Frysinger.) 3982 3983 Tarball signatures can now be built by running 'make signatures'. 3984 There are also new makefile rules 'tarballs', 'check_public', and 3985 separate makefile rules for each tarball and signature file. 3986 A few makefile rules are now more portable to strict POSIX. 3987 3988 The main web page now lists the canonical IANA URL. 3989 3990 3991 Release 2012h - 2012-10-26 22:49:10 -0700 3992 3993 Bahia no longer has DST. (Thanks to Kelley Cook.) 3994 3995 Tocantins has DST. (Thanks to Rodrigo Severo.) 3996 3997 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 3998 3999 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 4000 4001 Web page updates. 4002 4003 More C modernization, except that at Arthur David Olson's suggestion 4004 the instances of 'register' were kept. 4005 4006 4007 Release 2012g - 2012-10-17 20:59:45 -0700 4008 4009 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 4010 4011 Palestine fall 2012. (Thanks to Steffen Thorsen.) 4012 4013 Assume C89. 4014 4015 To attack the version-number problem, this release ships the file 4016 'Makefile' (which contains the release number) in both the tzcode and 4017 the tzdata tarballs. The two Makefiles are identical, and should be 4018 identical in any matching pair of tarballs, so it shouldn't matter 4019 which order you extract the tarballs. Perhaps we can come up with a 4020 better version-number scheme at some point; this scheme does have the 4021 virtue of not adding more files. 4022 4023 4024 Release 2012f - 2012-09-12 23:17:03 -0700 4025 4026 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 4027 20 this year. (Thanks to Steffen Thorsen.) 4028 4029 4030 Release 2012e - 2012-08-02 20:44:55 -0700 4031 4032 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 4033 (Thanks to Steffen Thorsen.) 4034 4035 * Use a single version number for both code and data. 4036 4037 * .gitignore: New file. 4038 4039 * Remove trailing white space. 4040 4041 4042 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 4043 4044 Changes for Morocco's timestamps, which take effect in a couple of 4045 hours, along with infrastructure changes to accommodate how the tz 4046 code and data are released on IANA. 4047 4048 4049 Release data2012c - 2012-03-27 12:17:25 -0400 4050 4051 africa 4052 Summer time changes for Morocco (to start late April 2012) 4053 4054 asia 4055 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 4056 4057 northamerica 4058 Haiti following US/Canada rules for 2012 (and we're assuming, 4059 for now anyway, for the future). 4060 4061 4062 Release 2012b - 2012-03-02 12:29:15 +0700 4063 4064 There is just one change to tzcode2012b (compared with 2012a): 4065 the Makefile that was accidentally included with 2012a has been 4066 replaced with the version that should have been there, which is 4067 identical with the previous version (from tzcode2011i). 4068 4069 There are just two changes in tzdata2012b compared with 2012a. 4070 4071 Most significantly, summer time in Cuba has been delayed 3 weeks 4072 (now starts April 1 rather than March 11). Since Mar 11 (the old start 4073 date, as listed in 2012a) is just a little over a week away, this 4074 change is urgent. 4075 4076 Less importantly, an excess tab in one of the changes in zone.tab 4077 in 2012a has been removed. 4078 4079 4080 Release 2012a - 2012-03-01 18:28:10 +0700 4081 4082 The changes in tzcode2012a (compared to the previous version, 2011i) 4083 are entirely to the README and tz-art.htm and tz-link.htm files, if 4084 none of those concern you, you can ignore the code update. The changes 4085 reflect the changed addresses for the mailing list and the code and 4086 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 4087 has been added to tz-link.htm). 4088 4089 In tzdata2012a (compared to the previous release, which was 2011n) 4090 the major changes are: 4091 Chile 2011/2012 and 2012/2013 summer time date adjustments. 4092 Falkland Islands onto permanent summer time (we're assuming for the 4093 foreseeable future, though 2012 is all we're fairly certain of.) 4094 Armenia has abolished Summer Time. 4095 Tokelau jumped the International Date Line back last December 4096 (just the same as their near neighbour, Samoa). 4097 America/Creston is a new zone for a small area of British Columbia 4098 There will be a leapsecond 2012-06-30 23:59:60 UTC. 4099 4100 Other minor changes are: 4101 Corrections to 1918 Canadian summer time end dates. 4102 Updated URL for UK time zone history (in comments) 4103 A few typos in Le Corre's list of free French place names (comments) 4104 4105 4106 Release data2011n - 2011-10-30 14:57:54 +0700 4107 4108 There are three changes of note - most urgently, Cuba (America/Havana) 4109 has extended summer time by two weeks, now to end on Nov 13, rather than 4110 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 4111 (Europe/Tiraspol) decided not to split from the rest of Moldova after 4112 all, and consequently that zone has been removed (again) and reinstated 4113 in the "backward" file as a link to Europe/Chisinau. And third, the 4114 end date for Fiji's summer time this summer was moved forward from the 4115 earlier planned Feb 26, to Jan 22. 4116 4117 Apart from that, Moldova (MD) returns to a single entry in zone.tab 4118 (and the incorrect syntax that was in the 2011m version of that file 4119 is so fixed - it would have been fixed in a different way had this 4120 change not happened - that's the "missing" sccs version id). 4121 4122 4123 Release data2011m - 2011-10-24 21:42:16 +0700 4124 4125 In particular, the typos in comments in the data (2011-11-17 should have 4126 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 4127 Tim Parenti noted) have been fixed, and the change for Ukraine has been 4128 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to 4129 Tim Parenti, and also Denys Gavrysh) 4130 4131 In addition, I added Europe/Tiraspol to zone.tab. 4132 4133 This time, all the files have new version numbers... (including the files 4134 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 4135 version numbers there...) 4136 4137 4138 Release data2011l - 2011-10-10 11:15:43 +0700 4139 4140 There are just 2 changes that cause different generated tzdata files from 4141 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 4142 is included, but commented out. Compared with the diff I sent out last week, 4143 this version also includes attributions for the sources for the changes 4144 (in much the same format as ado used, but the html tags have not been 4145 checked, verified, or used in any way at all, so if there are errors there, 4146 please let me know.) 4147 4148 4149 Release data2011k - 2011-09-20 17:54:03 -0400 4150 4151 [not summarized] 4152 4153 4154 Release data2011j - 2011-09-12 09:22:49 -0400 4155 4156 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 4157 Tanzania); there are also two spelling corrections to comments in 4158 the australasia file (with thanks to Christos Zoulas). 4159 4160 4161 Release 2011i - 2011-08-29 05:56:32 -0400 4162 4163 [not summarized] 4164 4165 4166 Release data2011h - 2011-06-15 18:41:48 -0400 4167 4168 Russia and Curaao changes 4169 4170 4171 Release 2011g - 2011-04-25 09:07:22 -0400 4172 4173 update the rules for Egypt to reflect its abandonment of DST this year 4174 4175 4176 Release 2011f - 2011-04-06 17:14:53 -0400 4177 4178 [not summarized] 4179 4180 4181 Release 2011e - 2011-03-31 16:04:38 -0400 4182 4183 Morocco, Chile, and tz-link changes 4184 4185 4186 Release 2011d - 2011-03-14 09:18:01 -0400 4187 4188 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 4189 4190 4191 Release 2011c - 2011-03-07 09:30:09 -0500 4192 4193 These do affect current timestamps in Chile and Annette Island, Canada. 4194 4195 4196 Release 2011b - 2011-02-07 08:44:50 -0500 4197 4198 [not summarized] 4199 4200 4201 Release 2011a - 2011-01-24 10:30:16 -0500 4202 4203 [not summarized] 4204 4205 4206 Release data2010o - 2010-11-01 09:18:23 -0400 4207 4208 change to the end of DST in Fiji in 2011 4209 4210 4211 Release 2010n - 2010-10-25 08:19:17 -0400 4212 4213 [not summarized] 4214 4215 4216 Release 2010m - 2010-09-27 09:24:48 -0400 4217 4218 Hong Kong, Vostok, and zic.c changes 4219 4220 4221 Release 2010l - 2010-08-16 06:57:25 -0400 4222 4223 [not summarized] 4224 4225 4226 Release 2010k - 2010-07-26 10:42:27 -0400 4227 4228 [not summarized] 4229 4230 4231 Release 2010j - 2010-05-10 09:07:48 -0400 4232 4233 changes for Baha de Banderas and for version naming 4234 4235 4236 Release data2010i - 2010-04-16 18:50:45 -0400 4237 4238 the end of DST in Morocco on 2010-08-08 4239 4240 4241 Release data2010h - 2010-04-05 09:58:56 -0400 4242 4243 [not summarized] 4244 4245 4246 Release data2010g - 2010-03-24 11:14:53 -0400 4247 4248 [not summarized] 4249 4250 4251 Release 2010f - 2010-03-22 09:45:46 -0400 4252 4253 [not summarized] 4254 4255 4256 Release data2010e - 2010-03-08 14:24:27 -0500 4257 4258 corrects the Dhaka bug found by Danvin Ruangchan 4259 4260 4261 Release data2010d - 2010-03-06 07:26:01 -0500 4262 4263 [not summarized] 4264 4265 4266 Release 2010c - 2010-03-01 09:20:58 -0500 4267 4268 changes including KRE's suggestion for earlier initialization of 4269 "goahead" and "goback" structure elements 4270 4271 4272 Release code2010a - 2010-02-16 10:40:04 -0500 4273 4274 [not summarized] 4275 4276 4277 Release data2010b - 2010-01-20 12:37:01 -0500 4278 4279 Mexico changes 4280 4281 4282 Release data2010a - 2010-01-18 08:30:04 -0500 4283 4284 changes to Dhaka 4285 4286 4287 Release data2009u - 2009-12-26 08:32:28 -0500 4288 4289 changes to DST in Bangladesh 4290 4291 4292 Release 2009t - 2009-12-21 13:24:27 -0500 4293 4294 [not summarized] 4295 4296 4297 Release data2009s - 2009-11-14 10:26:32 -0500 4298 4299 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 4300 4301 4302 Release 2009r - 2009-11-09 10:10:31 -0500 4303 4304 "antarctica" and "tz-link.htm" changes 4305 4306 4307 Release 2009q - 2009-11-02 09:12:40 -0500 4308 4309 with two corrections as reported by Eric Muller and Philip Newton 4310 4311 4312 Release data2009p - 2009-10-23 15:05:27 -0400 4313 4314 Argentina (including San Luis) changes (with the correction from 4315 Mariano Absatz) 4316 4317 4318 Release data2009o - 2009-10-14 16:49:38 -0400 4319 4320 Samoa (commentary only), Pakistan, and Bangladesh changes 4321 4322 4323 Release data2009n - 2009-09-22 15:13:38 -0400 4324 4325 added commentary for Argentina and a change to the end of DST in 4326 2009 in Pakistan 4327 4328 4329 Release data2009m - 2009-09-03 10:23:43 -0400 4330 4331 Samoa and Palestine changes 4332 4333 4334 Release data2009l - 2009-08-14 09:13:07 -0400 4335 4336 Samoa (comments only) and Egypt 4337 4338 4339 Release 2009k - 2009-07-20 09:46:08 -0400 4340 4341 [not summarized] 4342 4343 4344 Release data2009j - 2009-06-15 06:43:59 -0400 4345 4346 Bangladesh change (with a short turnaround since the DST change is 4347 impending) 4348 4349 4350 Release 2009i - 2009-06-08 09:21:22 -0400 4351 4352 updating for DST in Bangladesh this year 4353 4354 4355 Release 2009h - 2009-05-26 09:19:14 -0400 4356 4357 [not summarized] 4358 4359 4360 Release data2009g - 2009-04-20 16:34:07 -0400 4361 4362 Cairo 4363 4364 4365 Release data2009f - 2009-04-10 11:00:52 -0400 4366 4367 correct DST in Pakistan 4368 4369 4370 Release 2009e - 2009-04-06 09:08:11 -0400 4371 4372 [not summarized] 4373 4374 4375 Release 2009d - 2009-03-23 09:38:12 -0400 4376 4377 Morocco, Tunisia, Argentina, and American Astronomical Society changes 4378 4379 4380 Release data2009c - 2009-03-16 09:47:51 -0400 4381 4382 change to the start of Cuban DST 4383 4384 4385 Release 2009b - 2009-02-09 11:15:22 -0500 4386 4387 [not summarized] 4388 4389 4390 Release 2009a - 2009-01-21 10:09:39 -0500 4391 4392 [not summarized] 4393 4394 4395 Release data2008i - 2008-10-21 12:10:25 -0400 4396 4397 southamerica and zone.tab files, with Argentina DST rule changes and 4398 United States zone reordering and recommenting 4399 4400 4401 Release 2008h - 2008-10-13 07:33:56 -0400 4402 4403 [not summarized] 4404 4405 4406 Release 2008g - 2008-10-06 09:03:18 -0400 4407 4408 Fix a broken HTML anchor and update Brazil's DST transitions; 4409 there's also a slight reordering of information in tz-art.htm. 4410 4411 4412 Release data2008f - 2008-09-09 22:33:26 -0400 4413 4414 [not summarized] 4415 4416 4417 Release 2008e - 2008-07-28 14:11:17 -0400 4418 4419 changes by Arthur David Olson and Jesper Nrgaard Welen 4420 4421 4422 Release data2008d - 2008-07-07 09:51:38 -0400 4423 4424 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 4425 4426 4427 Release data2008c - 2008-05-19 17:48:03 -0400 4428 4429 Pakistan, Morocco, and Mongolia 4430 4431 4432 Release data2008b - 2008-03-24 08:30:59 -0400 4433 4434 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 4435 link provided 4436 4437 4438 Release 2008a - 2008-03-08 05:42:16 -0500 4439 4440 [not summarized] 4441 4442 4443 Release 2007k - 2007-12-31 10:25:22 -0500 4444 4445 most importantly, changes to the "southamerica" file based on 4446 Argentina's readoption of daylight saving time 4447 4448 4449 Release 2007j - 2007-12-03 09:51:01 -0500 4450 4451 1. eliminate the "P" (parameter) macro; 4452 4453 2. the "noncontroversial" changes circulated on the time zone 4454 mailing list (less the changes to "logwtmp.c"); 4455 4456 3. eliminate "too many transition" errors when "min" is used in time 4457 zone rules; 4458 4459 4. changes by Paul Eggert (including updated information for Venezuela). 4460 4461 4462 Release data2007i - 2007-10-30 10:28:11 -0400 4463 4464 changes for Cuba and Syria 4465 4466 4467 Release 2007h - 2007-10-01 10:05:51 -0400 4468 4469 changes by Paul Eggert, as well as an updated link to the ICU 4470 project in tz-link.htm 4471 4472 4473 Release 2007g - 2007-08-20 10:47:59 -0400 4474 4475 changes by Paul Eggert 4476 4477 The "leapseconds" file has been updated to incorporate the most 4478 recent International Earth Rotation and Reference Systems Service 4479 (IERS) bulletin. 4480 4481 There's an addition to tz-art.htm regarding the television show "Medium". 4482 4483 4484 Release 2007f - 2007-05-07 10:46:46 -0400 4485 4486 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 4487 Zealand) 4488 4489 changes to zic.c to allow hour values greater than 24 (along with 4490 Paul's improved time value overflow checking) 4491 4492 4493 Release 2007e - 2007-04-02 10:11:52 -0400 4494 4495 Syria and Honduras changes by Paul Eggert 4496 4497 zic.c variable renaming changes by Arthur David Olson 4498 4499 4500 Release 2007d - 2007-03-20 08:48:30 -0400 4501 4502 changes by Paul Eggert 4503 4504 the elimination of white space at the ends of lines 4505 4506 4507 Release 2007c - 2007-02-26 09:09:37 -0500 4508 4509 changes by Paul Eggert 4510 4511 4512 Release 2007b - 2007-02-12 09:34:20 -0500 4513 4514 Paul Eggert's proposed change to the quotation handling logic in zic.c. 4515 4516 changes to the commentary in "leapseconds" reflecting the IERS 4517 announcement that there is to be no positive leap second at the end 4518 of June 2007. 4519 4520 4521 Release 2007a - 2007-01-08 12:28:29 -0500 4522 4523 changes by Paul Eggert 4524 4525 Derick Rethans's Asmara change 4526 4527 Oscar van Vlijmen's Easter Island local mean time change 4528 4529 symbolic link changes 4530 4531 4532 Release 2006p - 2006-11-27 08:54:27 -0500 4533 4534 changes by Paul Eggert 4535 4536 4537 Release 2006o - 2006-11-06 09:18:07 -0500 4538 4539 changes by Paul Eggert 4540 4541 4542 Release 2006n - 2006-10-10 11:32:06 -0400 4543 4544 changes by Paul Eggert 4545 4546 4547 Release 2006m - 2006-10-02 15:32:35 -0400 4548 4549 changes for Uruguay, Palestine, and Egypt by Paul Eggert 4550 4551 (minimalist) changes to zic.8 to clarify "until" information 4552 4553 4554 Release data2006l - 2006-09-18 12:58:11 -0400 4555 4556 Paul's best-effort work on this coming weekend's Egypt time change 4557 4558 4559 Release 2006k - 2006-08-28 12:19:09 -0400 4560 4561 changes by Paul Eggert 4562 4563 4564 Release 2006j - 2006-08-21 09:56:32 -0400 4565 4566 changes by Paul Eggert 4567 4568 4569 Release code2006i - 2006-08-07 12:30:55 -0400 4570 4571 localtime.c fixes 4572 4573 Ken Pizzini's conversion script 4574 4575 4576 Release code2006h - 2006-07-24 09:19:37 -0400 4577 4578 adds public domain notices to four files 4579 4580 includes a fix for transition times being off by a second 4581 4582 adds a new recording to the "arts" file (information courtesy Colin Bowern) 4583 4584 4585 Release 2006g - 2006-05-08 17:18:09 -0400 4586 4587 northamerica changes by Paul Eggert 4588 4589 4590 Release 2006f - 2006-05-01 11:46:00 -0400 4591 4592 a missing version number problem is fixed (with thanks to Bradley 4593 White for catching the problem) 4594 4595 4596 Release 2006d - 2006-04-17 14:33:43 -0400 4597 4598 changes by Paul Eggert 4599 4600 added new items to tz-arts.htm that were found by Paul 4601 4602 4603 Release 2006c - 2006-04-03 10:09:32 -0400 4604 4605 two sets of data changes by Paul Eggert 4606 4607 a fencepost error fix in zic.c 4608 4609 changes to zic.c and the "europe" file to minimize differences 4610 between output produced by the old 32-bit zic and the new 64-bit 4611 version 4612 4613 4614 Release 2006b - 2006-02-20 10:08:18 -0500 4615 [tz32code2006b + tz64code2006b + tzdata2006b] 4616 4617 64-bit code 4618 4619 All SCCS IDs were bumped to "8.1" for this release. 4620 4621 4622 Release 2006a - 2006-01-30 08:59:31 -0500 4623 4624 changes by Paul Eggert (in particular, Indiana time zone moves) 4625 4626 an addition to the zic manual page to describe how special-case 4627 transitions are handled 4628 4629 4630 Release 2005r - 2005-12-27 09:27:13 -0500 4631 4632 Canadian changes by Paul Eggert 4633 4634 They also add "<pre>" directives to time zone data files and reflect 4635 changes to warning message logic in "zdump.c" (but with calls to 4636 "gettext" kept unbundled at the suggestion of Ken Pizzini). 4637 4638 4639 Release 2005q - 2005-12-13 09:17:09 -0500 4640 4641 Nothing earth-shaking here: 4642 1. Electronic mail addresses have been removed. 4643 2. Casts of the return value of exit have been removed. 4644 3. Casts of the argument of is.* macros have been added. 4645 4. Indentation in one section of zic.c has been fixed. 4646 5. References to dead URLs in the data files have been dealt with. 4647 4648 4649 Release 2005p - 2005-12-05 10:30:53 -0500 4650 4651 "systemv", "tz-link.htm", and "zdump.c" changes 4652 (less the casts of arguments to the is* macros) 4653 4654 4655 Release 2005o - 2005-11-28 10:55:26 -0500 4656 4657 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 4658 4659 zdump.c lint fixes by Arthur David Olson 4660 4661 4662 Release 2005n - 2005-10-03 09:44:09 -0400 4663 4664 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 4665 et al. changes) 4666 4667 4668 Release 2005m - 2005-08-29 12:15:40 -0400 4669 4670 changes by Paul Eggert (with a small tweak to the tz-art change) 4671 4672 a declaration of an unused variable has been removed from zdump.c 4673 4674 4675 Release 2005l - 2005-08-22 12:06:39 -0400 4676 4677 changes by Paul Eggert 4678 4679 overflow/underflow checks by Arthur David Olson, minus changes to 4680 the "Theory" file about the pending addition of 64-bit data (I grow 4681 less confident of the changes being accepted with each passing day, 4682 and the changes no longer increase the data files nine-fold--there's 4683 less than a doubling in size by my local Sun's reckoning) 4684 4685 4686 Release 2005k - 2005-07-14 14:14:24 -0400 4687 4688 The "leapseconds" file has been edited to reflect the recently 4689 announced leap second at the end of 2005. 4690 4691 I've also deleted electronic mail addresses from the files as an 4692 anti-spam measure. 4693 4694 4695 Release 2005j - 2005-06-13 14:34:13 -0400 4696 4697 These reflect changes to limit the length of time zone abbreviations 4698 and the characters used in those abbreviations. 4699 4700 There are also changes to handle POSIX-style "quoted" timezone 4701 environment variables. 4702 4703 The changes were circulated on the time zone mailing list; the only 4704 change since then was the removal of a couple of minimum-length of 4705 abbreviation checks. 4706 4707 4708 Release data2005i - 2005-04-21 15:04:16 -0400 4709 4710 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 4711 4712 4713 Release 2005h - 2005-04-04 11:24:47 -0400 4714 4715 changes by Paul Eggert 4716 4717 minor changes to Makefile and zdump.c to produce more useful output 4718 when doing a "make typecheck" 4719 4720 4721 Release 2005g - 2005-03-14 10:11:21 -0500 4722 4723 changes by Paul Eggert (a change to current DST rules in Uruguay and 4724 an update to a link to time zone software) 4725 4726 4727 Release 2005f - 2005-03-01 08:45:32 -0500 4728 4729 data and documentation changes by Paul Eggert 4730 4731 4732 Release 2005e - 2005-02-10 15:59:44 -0500 4733 4734 [not summarized] 4735 4736 4737 Release code2005d - 2005-01-31 09:21:47 -0500 4738 4739 make zic complain about links to links if the -v flag is used 4740 4741 have "make public" do more code checking 4742 4743 add an include to "localtime.c" for the benefit of gcc systems 4744 4745 4746 Release 2005c - 2005-01-17 18:36:29 -0500 4747 4748 get better results when mktime runs on a system where time_t is double 4749 4750 changes to the data files (most importantly to Paraguay) 4751 4752 4753 Release 2005b - 2005-01-10 09:19:54 -0500 4754 4755 Get localtime and gmtime working on systems with exotic time_t types. 4756 4757 Update the leap second commentary in the "leapseconds" file. 4758 4759 4760 Release 2005a - 2005-01-01 13:13:44 -0500 4761 4762 [not summarized] 4763 4764 4765 Release code2004i - 2004-12-14 13:42:58 -0500 4766 4767 Deal with systems where time_t is unsigned. 4768 4769 4770 Release code2004h - 2004-12-07 11:40:18 -0500 4771 4772 64-bit-time_t changes 4773 4774 4775 Release 2004g - 2004-11-02 09:06:01 -0500 4776 4777 update to Cuba (taking effect this weekend) 4778 4779 other changes by Paul Eggert 4780 4781 correction of the spelling of Oslo 4782 4783 changed versions of difftime.c and private.h 4784 4785 4786 Release code2004f - 2004-10-21 10:25:22 -0400 4787 4788 Cope with wide-ranging tm_year values. 4789 4790 4791 Release 2004e - 2004-10-11 14:47:21 -0400 4792 4793 Brazil/Argentina/Israel changes by Paul Eggert 4794 4795 changes to tz-link.htm by Paul 4796 4797 one small fix to Makefile 4798 4799 4800 Release 2004d - 2004-09-22 08:27:29 -0400 4801 4802 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 4803 4804 4805 Release 2004c - 2004-08-11 12:06:26 -0400 4806 4807 asctime-related changes 4808 4809 (variants of) some of the documentation changes suggested by Paul Eggert 4810 4811 4812 Release 2004b - 2004-07-19 14:33:35 -0400 4813 4814 data changes by Paul Eggert - most importantly, updates for Argentina 4815 4816 4817 Release 2004a - 2004-05-27 12:00:47 -0400 4818 4819 changes by Paul Eggert 4820 4821 Handle DST transitions that occur at the end of a month in some 4822 years but at the start of the following month in other years. 4823 4824 Add a copy of the correspondence that's the basis for claims about 4825 DST in the Navajo Nation. 4826 4827 4828 Release 2003e - 2003-12-15 09:36:47 -0500 4829 4830 changes by Arthur David Olson (primarily code changes) 4831 4832 changes by Paul Eggert (primarily data changes) 4833 4834 minor changes to "Makefile" and "northamerica" (in the latter case, 4835 optimization of the "Toronto" rules) 4836 4837 4838 Release 2003d - 2003-10-06 09:34:44 -0400 4839 4840 changes by Paul Eggert 4841 4842 4843 Release 2003c - 2003-09-16 10:47:05 -0400 4844 4845 Fix bad returns in zic.c's inleap function. 4846 Thanks to Bradley White for catching the problem! 4847 4848 4849 Release 2003b - 2003-09-16 07:13:44 -0400 4850 4851 Add a "--version" option (and documentation) to the zic and zdump commands. 4852 4853 changes to overflow/underflow checking in zic 4854 4855 a localtime typo fix. 4856 4857 Update the leapseconds and tz-art.htm files. 4858 4859 4860 Release 2003a - 2003-03-24 09:30:54 -0500 4861 4862 changes by Paul Eggert 4863 4864 a few additions and modifications to the tz-art.htm file 4865 4866 4867 Release 2002d - 2002-10-15 13:12:42 -0400 4868 4869 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 4870 4871 There's also a new time zone quote in "tz-art.htm". 4872 4873 4874 Release 2002c - 2002-04-04 11:55:20 -0500 4875 4876 changes by Paul Eggert 4877 4878 Change zic.c to avoid creating symlinks to files that don't exist. 4879 4880 4881 Release 2002b - 2002-01-28 12:56:03 -0500 4882 4883 [These change notes are for Release 2002a, which was corrupted. 4884 2002b was a corrected version of 2002a.] 4885 4886 changes by Paul Eggert 4887 4888 Update the "leapseconds" file to note that there'll be no leap 4889 second at the end of June, 2002. 4890 4891 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 4892 4893 Change to "difftime.c" to avoid sizeof problems. 4894 4895 4896 Release 2001d - 2001-10-09 13:31:32 -0400 4897 4898 changes by Paul Eggert 4899 4900 4901 Release 2001c - 2001-06-05 13:59:55 -0400 4902 4903 changes by Paul Eggert and Andrew Brown 4904 4905 4906 Release 2001b - 2001-04-05 16:44:38 -0400 4907 4908 changes by Paul Eggert (modulo jnorgard's typo fix) 4909 4910 tz-art.htm has been HTMLified. 4911 4912 4913 Release 2001a - 2001-03-13 12:57:44 -0500 4914 4915 changes by Paul Eggert 4916 4917 An addition to the "leapseconds" file: comments with the text of the 4918 latest IERS leap second notice. 4919 4920 Trailing white space has been removed from data file lines, and 4921 repeated spaces in "Rule Jordan" lines in the "asia" file have been 4922 converted to tabs. 4923 4924 4925 Release 2000h - 2000-12-14 15:33:38 -0500 4926 4927 changes by Paul Eggert 4928 4929 one typo fix in the "art" file 4930 4931 With providence, this is the last update of the millennium. 4932 4933 4934 Release 2000g - 2000-10-10 11:35:22 -0400 4935 4936 changes by Paul Eggert 4937 4938 correction of John Mackin's name submitted by Robert Elz 4939 4940 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 4941 Emmy Awards broadcast. 4942 4943 4944 Release 2000f - 2000-08-10 09:31:58 -0400 4945 4946 changes by Paul Eggert 4947 4948 Added information in "tz-art.htm" on a Seinfeld reference to DST. 4949 4950 Error checking and messages in the "yearistype" script have been 4951 improved. 4952 4953 4954 Release 2000e - 2000-07-31 09:27:54 -0400 4955 4956 data changes by Paul Eggert 4957 4958 a change to the default value of the defined constant HAVE_STRERROR 4959 4960 the addition of a Dave Barry quote on DST to the tz-arts file 4961 4962 4963 Release 2000d - 2000-04-20 15:43:04 -0400 4964 4965 changes to the documentation and code of strftime for C99 conformance 4966 4967 a bug fix for date.c 4968 4969 These are based on (though modified from) changes by Paul Eggert. 4970 4971 4972 Release 2000c - 2000-03-04 10:31:43 -0500 4973 4974 changes by Paul Eggert 4975 4976 4977 Release 2000b - 2000-02-21 12:16:29 -0500 4978 4979 changes by Paul Eggert and Joseph Myers 4980 4981 modest tweaks to the tz-art.htm and tz-link.htm files 4982 4983 4984 Release 2000a - 2000-01-18 09:21:26 -0500 4985 4986 changes by Paul Eggert 4987 4988 The two hypertext documents have also been renamed. 4989 4990 4991 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 4992 4993 Paul Eggert's changes 4994 4995 additions to the "zic" manual page and the "Arts.htm" file 4996 4997 4998 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 4999 5000 [not summarized] 5001 5002 5003 Release data1999h - 1999-10-07 03:50:29 -0400 5004 5005 changes by Paul Eggert to "europe" (most importantly, fixing 5006 Lithuania and Estonia) 5007 5008 5009 Release 1999g - 1999-09-28 11:06:18 -0400 5010 5011 data changes by Paul Eggert (most importantly, the change for 5012 Lebanon that buys correctness for this coming Sunday) 5013 5014 The "code" file contains changes to "Makefile" and "checktab.awk" to 5015 allow better checking of time zone files before they are published. 5016 5017 5018 Release 1999f - 1999-09-23 09:48:14 -0400 5019 5020 changes by Arthur David Olson and Paul Eggert 5021 5022 5023 Release 1999e - 1999-08-17 15:20:54 -0400 5024 5025 changes circulated by Paul Eggert, although the change to handling 5026 of DST-specifying timezone names has been commented out for now 5027 (search for "XXX" in "localtime.c" for details). These files also 5028 do not make any changes to the start of DST in Brazil. 5029 5030 In addition to Paul's changes, there are updates to "Arts.htm" and 5031 cleanups of URLs. 5032 5033 5034 Release 1999d - 1999-03-30 11:31:07 -0500 5035 5036 changes by Paul Eggert 5037 5038 The Makefile's "make public" rule has also been changed to do a test 5039 compile of each individual time zone data file (which should help 5040 avoid problems such as the one we had with Nicosia). 5041 5042 5043 Release 1999c - 1999-03-25 09:47:47 -0500 5044 5045 changes by Paul Eggert, most importantly the change for Chile. 5046 5047 5048 Release 1999b - 1999-02-01 17:51:44 -0500 5049 5050 changes by Paul Eggert 5051 5052 code changes (suggested by Mani Varadarajan, mani at be.com) for 5053 correct handling of symbolic links when building using a relative directory 5054 5055 code changes to generate correct messages for failed links 5056 5057 updates to the URLs in Arts.htm 5058 5059 5060 Release 1999a - 1999-01-19 16:20:29 -0500 5061 5062 error message internationalizations and corrections in zic.c and 5063 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 5064 to whom thanks!) 5065 5066 5067 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 5068 5069 changes for Brazil, Chile, and Germany 5070 5071 support for use of "24:00" in the input files for the time zone compiler 5072 5073 5074 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 5075 5076 changes by Paul Eggert 5077 5078 correction to a define in the "private.h" file 5079 5080 5081 Release data1998g - 1998-08-11 03:28:35 -0000 5082 [tzdata1998g.tar.gz is missing!] 5083 5084 Lithuanian change provided by mgedmin at pub.osf.it 5085 5086 Move creation of the GMT link with Etc/GMT to "etcetera" (from 5087 "backward") to ensure that the GMT file is created even where folks 5088 don't want the "backward" links (as suggested by Paul Eggert). 5089 5090 5091 Release data1998f - 1998-07-20 13:50:00 -0000 5092 [tzdata1998f.tar.gz is missing!] 5093 5094 Update the "leapseconds" file to include the newly-announced 5095 insertion at the end of 1998. 5096 5097 5098 Release code1998f - 1998-06-01 10:18:31 -0400 5099 5100 addition to localtime.c by Guy Harris 5101 5102 5103 Release 1998e - 1998-05-28 09:56:26 -0400 5104 5105 The Makefile is changed to produce zoneinfo-posix rather than 5106 zoneinfo/posix, and to produce zoneinfo-leaps rather than 5107 zoneinfo/right. 5108 5109 data changes by Paul Eggert 5110 5111 changes from Guy Harris to provide asctime_r and ctime_r 5112 5113 A usno1998 file (substantially identical to usno1997) has been added. 5114 5115 5116 Release 1998d - 1998-05-14 11:58:34 -0400 5117 5118 changes to comments (in particular, elimination of references to CIA maps). 5119 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 5120 where changes occur. 5121 5122 5123 Release 1998c - 1998-02-28 12:32:26 -0500 5124 5125 changes by Paul Eggert (save the "French correction," on which I'll 5126 wait for the dust to settle) 5127 5128 symlink changes 5129 5130 changes and additions to Arts.htm 5131 5132 5133 Release 1998b - 1998-01-17 14:31:51 -0500 5134 5135 URL cleanups and additions 5136 5137 5138 Release 1998a - 1998-01-13 12:37:35 -0500 5139 5140 changes by Paul Eggert 5141 5142 5143 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 5144 5145 changes by Paul Eggert, with minor modifications from Arthur David 5146 Olson to make the files more browser friendly 5147 5148 5149 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 5150 5151 minor changes to put "TZif" at the start of each timezone information file 5152 5153 a rule has also been added to the Makefile so you can 5154 make zones 5155 to just recompile the zone information files (rather than doing a 5156 full "make install" with its other effects). 5157 5158 5159 Release data1997i - 1997-10-07 08:45:38 -0400 5160 5161 changes to Africa by Paul Eggert 5162 5163 5164 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 5165 5166 corrections for Uruguay (and other locations) 5167 5168 Arthur David Olson's simple-minded fix allowing mktime to both 5169 correctly handle leap seconds and correctly handle tm_sec values 5170 upon which arithmetic has been performed. 5171 5172 5173 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 5174 5175 Paul Eggert's updates 5176 5177 a small change to a function prototype; 5178 5179 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 5180 include information on Around the World in Eighty Days. 5181 5182 5183 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 5184 5185 fixes to zic's error handling 5186 5187 changes inspired by the item circulated on Slovenia 5188 5189 The description of Web resources has been HTMLified for browsing 5190 convenience. 5191 5192 A new piece of tz-related music has been added to the "Music" file. 5193 5194 5195 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 5196 5197 Paul Eggert's latest suggestions 5198 5199 5200 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 5201 5202 changes to "zic.c" to correct performance of the "-s" option 5203 5204 a new file "usno1997" 5205 5206 5207 Release data1997c - 1997-03-04 09:58:18 -0500 5208 5209 changes in Israel 5210 5211 5212 Release 1997b - 1997-02-27 18:34:19 -0500 5213 5214 The data file incorporates the 1997 leap second. 5215 5216 The code file incorporates Arthur David Olson's take on the 5217 zic/multiprocessor/directory-creation situation. 5218 5219 5220 Release 1997a - 1997-01-21 09:11:10 -0500 5221 5222 Paul Eggert's Antarctica (and other changes) 5223 5224 Arthur David Olson finessed the "getopt" issue by checking against 5225 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 5226 is returned while SunOS 5.5's manual says EOF is returned). 5227 5228 5229 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 5230 5231 Paul Eggert's latest changes 5232 5233 5234 Release code1996n - 1996-12-16 09:42:02 -0500 5235 5236 link snapping fix from Bruce Evans (via Garrett Wollman) 5237 5238 5239 Release data1996m - 1996-11-24 02:37:34 -0000 5240 [tzdata1996m.tar.gz is missing!] 5241 5242 Paul Eggert's batch of changes 5243 5244 5245 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 5246 5247 No functional changes here; the files have simply been changed to 5248 make more use of ISO style dates in comments. The names of the above 5249 files now include the year in full. 5250 5251 5252 Release code96l - 1996-09-08 17:12:20 -0400 5253 5254 tzcode96k was missing a couple of pieces. 5255 5256 5257 Release 96k - 1996-09-08 16:06:22 -0400 5258 5259 the latest round of changes from Paul Eggert 5260 5261 the recent Year 2000 material 5262 5263 5264 Release code96j - 1996-07-30 13:18:53 -0400 5265 5266 Set sp->typecnt as suggested by Timothy Patrick Murphy. 5267 5268 5269 Release code96i - 1996-07-27 20:11:35 -0400 5270 5271 Paul's suggested patch for strftime %V week numbers 5272 5273 5274 Release data96i - 1996-07-01 18:13:04 -0400 5275 5276 "northamerica" and "europe" changes by Paul Eggert 5277 5278 5279 Release code96h - 1996-06-05 08:02:21 -0400 5280 5281 fix for handling transitions specified in Universal Time 5282 5283 Some "public domain" notices have also been added. 5284 5285 5286 Release code96g - 1996-05-16 14:00:26 -0400 5287 5288 fix for the simultaneous-DST-and-zone-change challenge 5289 5290 5291 Release data96h - 1996-05-09 17:40:51 -0400 5292 5293 changes by Paul Eggert 5294 5295 5296 Release code96f-data96g - 1996-05-03 03:09:59 -0000 5297 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 5298 5299 The changes get us some of the way to fixing the problems noted in Paul 5300 Eggert's letter yesterday (in addition to a few others). The approach 5301 has been to make zic a bit smarter about figuring out what time zone 5302 abbreviations apply just after the time specified in the "UNTIL" part 5303 of a zone line. Putting the smarts in zic means avoiding having 5304 transition times show up in both "Zone" lines and "Rule" lines, which 5305 in turn avoids multiple transition time entries in time zone files. 5306 (This also makes the zic input files such as "europe" a bit shorter and 5307 should ease maintenance.) 5308 5309 5310 Release data96f - 1996-04-19 19:20:03 -0000 5311 [tzdata96f.tar.gz is missing!] 5312 5313 The only changes are to the "northamerica" file; the time zone 5314 abbreviation for Denver is corrected to MST (and MDT), and the 5315 comments for Mexico have been updated. 5316 5317 5318 Release data96e - 1996-03-19 17:37:26 -0500 5319 5320 Proposals by Paul Eggert, in particular the Portugal change that 5321 comes into play at the end of this month. 5322 5323 5324 Release data96d - 1996-03-18 20:49:39 -0500 5325 5326 [not summarized] 5327 5328 5329 Release code96e - 1996-02-29 15:43:27 -0000 5330 [tzcode96e.tar.gz is missing!] 5331 5332 internationalization changes and the fix to the documentation for strftime 5333 5334 5335 Release code96d-data96c - 1996-02-12 11:05:27 -0500 5336 5337 The "code" file simply updates Bob Kridle's electronic address. 5338 5339 The "data" file updates rules for Mexico. 5340 5341 5342 Release data96b - 1996-01-27 15:44:42 -0500 5343 5344 Kiribati change 5345 5346 5347 Release code96c - 1996-01-16 16:58:15 -0500 5348 5349 leap-year streamlining and binary-search changes 5350 5351 fix to newctime.3 5352 5353 5354 Release code96b - 1996-01-10 20:42:39 -0500 5355 5356 fixes and enhancements from Paul Eggert, including code that 5357 emulates the behavior of recent versions of the SunOS "date" 5358 command. 5359 5360 5361 Release 96a - 1996-01-06 09:08:24 -0500 5362 5363 Israel updates 5364 5365 fixes to strftime.c for correct ISO 8601 week number generation, 5366 plus support for two new formats ('G' and 'g') to give ISO 8601 year 5367 numbers (which are not necessarily the same as calendar year numbers) 5368 5369 5370 Release code95i-data95m - 1995-12-21 12:46:47 -0500 5371 5372 The latest revisions from Paul Eggert are included, the usno1995 5373 file has been updated, and a new file ("WWW") covering useful URLs 5374 has been added. 5375 5376 5377 Release code95h-data95l - 1995-12-19 18:10:12 -0500 5378 5379 A simplification of a macro definition, a change to data for Sudan, 5380 and (for last minute shoppers) notes in the "Music" file on the CD 5381 "Old Man Time". 5382 5383 5384 Release code95g-data95k - 1995-10-30 10:32:47 -0500 5385 5386 (slightly reformatted) 8-bit-clean proposed patch 5387 5388 minor patch: US/Eastern -> America/New_York 5389 5390 snapshot of the USNO's latest data ("usno1995") 5391 5392 some other minor cleanups 5393 5394 5395 Release code95f-data95j - 1995-10-28 21:01:34 -0000 5396 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 5397 5398 European cleanups 5399 5400 support for 64-bit time_t's 5401 5402 optimization in localtime.c 5403 5404 5405 Release code95e - 1995-10-13 13:23:57 -0400 5406 5407 the mktime change to scan from future to past when trying to find time zone 5408 offsets 5409 5410 5411 Release data95i - 1995-09-26 10:43:26 -0400 5412 5413 For Canada/Central, guess that the Sun customer's "one week too 5414 early" was just a approximation, and the true error is one month 5415 too early. This is consistent with the rest of Canada. 5416 5417 5418 Release data95h - 1995-09-21 11:26:48 -0400 5419 5420 latest changes from Paul Eggert 5421 5422 5423 Release code95d - 1995-09-14 11:14:45 -0400 5424 5425 the addition of a "Music" file, which documents four recorded 5426 versions of the tune "Save That Time". 5427 5428 5429 Release data95g - 1995-09-01 17:21:36 -0400 5430 5431 "yearistype" correction 5432 5433 5434 Release data95f - 1995-08-28 20:46:56 -0400 5435 5436 Paul Eggert's change to the australasia file 5437 5438 5439 Release data95e - 1995-07-08 18:02:34 -0400 5440 5441 The only change is a leap second at the end of this year. 5442 Thanks to Bradley White for forwarding news on the leap second. 5443 5444 5445 Release data95d - 1995-07-03 13:26:22 -0400 5446 5447 Paul Eggert's changes 5448 5449 5450 Release data95c - 1995-07-02 19:19:28 -0400 5451 5452 changes to "asia", "backward", "europe", and "southamerica" 5453 (read: northamericacentrics need not apply) 5454 5455 5456 Release code95c - 1995-03-13 14:00:46 -0500 5457 5458 one-line fix for sign extension problems in detzcode 5459 5460 5461 Release 95b - 1995-03-04 11:22:38 -0500 5462 5463 Minor changes in both: 5464 5465 The "code" file contains a workaround for the lack of "unistd.h" in 5466 Microsoft C++ version 7. 5467 5468 The "data" file contains a fixed "Link" for America/Shiprock. 5469 5470 5471 Release 94h - 1994-12-10 12:51:14 -0500 5472 5473 The files: 5474 5475 * incorporate the changes to "zdump" and "date" to make changes to 5476 the "TZ" environment variable permanent; 5477 5478 * incorporate the table changes by Paul Eggert; 5479 5480 * include (and document) support for universal time specifications in 5481 data files - but do not (yet) include use of this feature in the 5482 data files. 5483 5484 Think of this as "TZ Classic" - the software has been set up not to break if 5485 universal time shows up in its input, and data entries have been 5486 left as is so as not to break existing implementations. 5487 5488 5489 Release data94f - 1994-08-20 12:56:09 -0400 5490 5491 (with thanks!) the latest data updates from Paul Eggert 5492 5493 5494 Release data94e - 1994-06-04 13:13:53 -0400 5495 5496 [not summarized] 5497 5498 5499 Release code94g - 1994-05-05 12:14:07 -0400 5500 5501 fix missing "optind.c" and a reference to it in the Makefile 5502 5503 5504 Release code94f - 1994-05-05 13:00:33 -0000 5505 [tzcode94f.tar.gz is missing!] 5506 5507 changes to avoid overflow in difftime, as well as changes to cope 5508 with the 52/53 challenge in strftime 5509 5510 5511 Release code94e - 1994-03-30 23:32:59 -0500 5512 5513 change for the benefit of PCTS 5514 5515 5516 Release 94d - 1994-02-24 15:42:25 -0500 5517 5518 Avoid clashes with POSIX semantics for zones such as GMT+4. 5519 5520 Some other very minor housekeeping is also present. 5521 5522 5523 Release code94c - 1994-02-10 08:52:40 -0500 5524 5525 Fix bug where mkdirs was broken unless you compile with 5526 -fwritable-strings (which is generally losing to do). 5527 5528 5529 Release 94b - 1994-02-07 10:04:33 -0500 5530 5531 work by Paul Eggert who notes: 5532 5533 I found another book of time zone histories by E W Whitman; it's not 5534 as extensive as Shanks but has a few goodies of its own. I used it 5535 to update the tables. I also fixed some more as a result of 5536 correspondence with Adam David and Peter Ilieve, and move some stray 5537 links from 'europe' to 'backward'. I corrected some scanning errors 5538 in usno1989. 5539 5540 As far as the code goes, I fixed zic to allow years in the range 5541 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 5542 And I cleaned up the zic documentation a little bit. 5543 5544 5545 Release data94a - 1994-02-03 08:58:54 -0500 5546 5547 It simply incorporates the recently announced leap second into the 5548 "leapseconds" file. 5549 5550 5551 Release 93g - 1993-11-22 17:28:27 -0500 5552 5553 Paul Eggert has provided a good deal of historic information (based 5554 on Shanks), and there are some code changes to deal with the buglets 5555 that crawled out in dealing with the new information. 5556 5557 5558 Release 93f - 1993-10-15 12:27:46 -0400 5559 5560 Paul Eggert's changes 5561 5562 5563 Release 93e - 1993-09-05 21:21:44 -0400 5564 5565 This has updated data for Israel, England, and Kwajalein. There's 5566 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 5567 Thanks to Paul Eggert and Peter Ilieve for the changes. 5568 5569 5570 Release 93d - 1993-06-17 23:34:17 -0400 5571 5572 new fix and new data on Israel 5573 5574 5575 Release 93c - 1993-06-06 19:31:55 -0400 5576 5577 [not summarized] 5578 5579 5580 Release 93b - 1993-02-02 14:53:58 -0500 5581 5582 updated "leapseconds" file 5583 5584 5585 Release 93 - 1993-01-08 07:01:06 -0500 5586 5587 At kre's suggestion, the package has been split in two - a code piece 5588 (which also includes documentation) that's only of use to folks who 5589 want to recompile things and a data piece useful to anyone who can 5590 run "zic". 5591 5592 The new version has a few changes to the data files, a few 5593 portability changes, and an off-by-one fix (with thanks to 5594 Tom Karzes at deshaw.com for providing a description and a 5595 solution). 5596 5597 5598 Release 92c - 1992-11-21 17:35:36 -0000 5599 [tz92c.tar.Z is missing!] 5600 5601 The fallout from the latest round of DST transitions. 5602 5603 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 5604 there's also a change to "zic.c" that makes it portable to more systems. 5605 5606 5607 Release 92 - 1992-04-25 18:17:03 -0000 5608 [tz92.tar.Z is missing!] 5609 5610 By popular demand (well, at any rate, following a request by kre at munnari) 5611 5612 5613 The 1989 update of the time zone package featured: 5614 5615 * POSIXization (including interpretation of POSIX-style TZ environment 5616 variables, provided by Guy Harris), 5617 * ANSIfication (including versions of "mktime" and "difftime"), 5618 * SVIDulation (an "altzone" variable) 5619 * MACHination (the "gtime" function) 5620 * corrections to some time zone data (including corrections to the rules 5621 for Great Britain and New Zealand) 5622 * reference data from the United States Naval Observatory for folks who 5623 want to do additional time zones 5624 * and the 1989 data for Saudi Arabia. 5625 5626 (Since this code will be treated as "part of the implementation" in some 5627 places and as "part of the application" in others, there's no good way to 5628 name functions, such as timegm, that are not part of the proposed ANSI C 5629 standard; such functions have kept their old, underscore-free names in this 5630 update.) 5631 5632 And the "dysize" function has disappeared; it was present to allow 5633 compilation of the "date" command on old BSD systems, and a version of "date" 5634 is now provided in the package. The "date" command is not created when you 5635 "make all" since it may lack options provided by the version distributed with 5636 your operating system, or may not interact with the system in the same way 5637 the native version does. 5638 5639 Since POSIX frowns on correct leap second handling, the default behavior of 5640 the "zic" command (in the absence of a "-L" option) has been changed to omit 5641 leap second information from its output files. 5642 5643 5644 ----- 5645 Notes 5646 5647 This file contains copies of the part of each release announcement 5648 that talks about the changes in that release. The text has been 5649 adapted and reformatted for the purposes of this file. 5650 5651 Traditionally a release R consists of a pair of tarball files, 5652 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 5653 code2010a, data2012c) consist of just one or the other tarball, and a 5654 few (e.g., code2012c-data2012d) have tarballs with mixed version 5655 numbers. Recent releases also come in an experimental format 5656 consisting of a single tarball tzdb-R.tar.lz with extra data. 5657 5658 Release timestamps are taken from the release's commit (for newer, 5659 Git-based releases), from the newest file in the tarball (for older 5660 releases, where this info is available) or from the email announcing 5661 the release (if all else fails; these are marked with a time zone 5662 abbreviation of -0000 and an "is missing!" comment). 5663 5664 Earlier versions of the code and data were not announced on the tz 5665 list and are not summarized here. 5666 5667 This file is in the public domain. 5668 5669 Local Variables: 5670 coding: utf-8 5671 End: 5672
Indexes created Mon Sep 29 15:09:53 GMT 2025