NEWS revision 1.41
1 News for the tz database 2 3 Release 2022g - 2022-11-29 08:58:31 -0800 4 5 Briefly: 6 The northern edge of Chihuahua changes to US timekeeping. 7 Much of Greenland stops changing clocks after March 2023. 8 Fix some pre-1996 timestamps in northern Canada. 9 C89 is now deprecated; please use C99 or later. 10 Portability fixes for AIX, libintl, MS-Windows, musl, z/OS 11 In C code, use more C23 features if available. 12 C23 timegm now supported by default 13 Fixes for unlikely integer overflows 14 15 Changes to future timestamps 16 17 In the Mexican state of Chihuahua, the border strip near the US 18 will change to agree with nearby US locations on 2022-11-30. 19 The strip's western part, represented by Ciudad Jurez, switches 20 from -06 all year to -07/-06 with US DST rules, like El Paso, TX. 21 The eastern part, represented by Ojinaga, will observe US DST next 22 year, like Presidio, TX. (Thanks to Heitor David Pinto.) 23 A new Zone America/Ciudad_Juarez splits from America/Ojinaga. 24 25 Much of Greenland, represented by America/Nuuk, stops observing 26 winter time after March 2023, so its daylight saving time becomes 27 standard time. (Thanks to Jonas Nyrup and Jrgen Appel.) 28 29 Changes to past timestamps 30 31 Changes for pre-1996 northern Canada (thanks to Chris Walton): 32 33 Merge America/Iqaluit and America/Pangnirtung into the former, 34 with a backward compatibility link for the latter name. 35 There is no good evidence the two locations differ since 1970. 36 This change affects pre-1996 America/Pangnirtung timestamps. 37 38 Cambridge Bay, Inuvik, Iqaluit, Rankin Inlet, Resolute and 39 Yellowknife did not observe DST in 1965, and did observe DST 40 from 1972 through 1979. 41 42 Whitehorse moved from -09 to -08 on 1966-02-27, not 1967-05-28. 43 44 Colombia's 1993 fallback was 02-06 24:00, not 04-04 00:00. 45 (Thanks to Alois Treindl.) 46 47 Singapore's 1981-12-31 change was at 16:00 UTC (23:30 local time), 48 not 24:00 local time. (Thanks to Geoff Clare via Robert Elz.) 49 50 Changes to code 51 52 Although tzcode still works with C89, bugs found in recent routine 53 maintenance indicate that bitrot has set in and that in practice 54 C89 is no longer used to build tzcode. As it is a maintenance 55 burden, support for C89 is planned to be removed soon. Instead, 56 please use compilers compatible with C99, C11, C17, or C23. 57 58 timegm, which tzcode implemented in 1989, will finally be 59 standardized 34 years later as part of C23, so timegm is now 60 supported even if STD_INSPIRED is not defined. 61 62 Fix bug in zdump's tzalloc emulation on hosts that lack tm_zone. 63 (Problem reported by on Trn Cng Danh.) 64 65 Fix bug in zic on hosts where malloc(0) yields NULL on success. 66 (Problem reported by Tim McBrayer for AIX 6.1.) 67 68 Fix zic configuration to avoid linkage failures on some platforms. 69 (Problems reported by Gilmore Davidson and Igor Ivanov.) 70 71 Work around MS-Windows nmake incompatibility with POSIX. 72 (Problem reported by Manuela Friedrich.) 73 74 Port mktime and strftime to debugging platforms where accessing 75 uninitialized data has undefined behavior (strftime problem 76 reported by Robert Elz). 77 78 Check more carefully for unlikely integer overflows, preferring 79 C23 <stdckdint.h> to overflow checking by hand, as the latter has 80 had obscure bugs. 81 82 Changes to build procedure 83 84 New Makefile rule check_mild that skips checking whether Link 85 lines are in the file 'backward'. (Inspired by a suggestion from 86 Stephen Colebourne.) 87 88 On C23-compatible platforms tzcode no longer uses syntax like 89 'static [[noreturn]] void usage(void);'. Instead, it uses 90 '[[noreturn]] static void usage(void);' as strict C23 requires. 91 (Problem reported by Houge Langley.) 92 93 94 Release 2022f - 2022-10-28 18:04:57 -0700 95 96 Briefly: 97 Mexico will no longer observe DST except near the US border. 98 Chihuahua moves to year-round -06 on 2022-10-30. 99 Fiji no longer observes DST. 100 Move links to 'backward'. 101 In vanguard form, GMT is now a Zone and Etc/GMT a link. 102 zic now supports links to links, and vanguard form uses this. 103 Simplify four Ontario zones. 104 Fix a Y2438 bug when reading TZif data. 105 Enable 64-bit time_t on 32-bit glibc platforms. 106 Omit large-file support when no longer needed. 107 In C code, use some C23 features if available. 108 Remove no-longer-needed workaround for Qt bug 53071. 109 110 Changes to future timestamps 111 112 Mexico will no longer observe DST after 2022, except for areas 113 near the US border that continue to observe US DST rules. 114 On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves 115 from -07 (-06 with DST) to year-round -06, thus not changing 116 its clocks that day. The new law states that Chihuahua 117 near the US border no longer observes US DST. 118 (Thanks to gera for the heads-up about Chihuahua.) 119 120 Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.) 121 For now, assume DST is suspended indefinitely. 122 123 Changes to data 124 125 Move links to 'backward' to ease and simplify link maintenance. 126 This affects generated data only if you use 'make BACKWARD='. 127 128 GMT is now a Zone and Etc/GMT a link instead of vice versa, 129 as GMT is needed for leap second support whereas Etc/GMT is not. 130 However, this change exposes a bug in TZUpdater 2.3.2 so it is 131 present only in vanguard form for now. 132 133 Vanguard form now uses links to links, as zic now supports this. 134 135 Changes to past timestamps 136 137 Simplify four Ontario zones, as most of the post-1970 differences 138 seem to have been imaginary. (Problem reported by Chris Walton.) 139 Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay 140 to 'backzone'; backward-compatibility links still work, albeit 141 with some different timestamps before November 2005. 142 143 Changes to code 144 145 zic now supports links to links regardless of input line order. 146 For example, if Australia/Sydney is a Zone, the lines 147 Link Australia/Canberra Australia/ACT 148 Link Australia/Sydney Australia/Canberra 149 now work correctly, even though the shell commands 150 ln Australia/Canberra Australia/ACT 151 ln Australia/Sydney Australia/Canberra 152 would fail because the first command attempts to use a link 153 Australia/Canberra that does not exist until after the second 154 command is executed. Previously, zic had unspecified behavior if 155 a Link line's target was another link, and zic often misbehaved if 156 a Link line's target was a later Link line. 157 158 Fix line number in zic's diagnostic for a link to a link. 159 160 Fix a bug that caused localtime to mishandle timestamps starting 161 in the year 2438 when reading data generated by 'zic -b fat' when 162 distant-future DST transitions occur at times given in standard 163 time or in UT, not the usual case of local time. This occurs when 164 the corresponding .zi Rule lines specify DST transitions with TO 165 columns of 'max' and AT columns that end in 's' or 'u'. The 166 number 2438 comes from the 32-bit limit in the year 2038, plus the 167 400-year Gregorian cycle. (Problem reported by Bradley White.) 168 169 On glibc 2.34 and later, which optionally supports 64-bit time_t 170 on platforms like x86 where time_t was traditionally 32 bits, 171 default time_t to 64 instead of 32 bits. This lets functions like 172 localtime support timestamps after the year 2038, and fixes 173 year-2038 problems in zic when accessing files dated after 2038. 174 To continue to limit time_t to 32 bits on these platforms, use 175 "make CFLAGS='-D_TIME_BITS=32'". 176 177 In C code, do not enable large-file support on platforms like AIX 178 and macOS that no longer need it now that tzcode does not use 179 off_t or related functions like 'stat'. Large-file support is 180 still enabled by default on GNU/Linux, as it is needed for 64-bit 181 time_t support. 182 183 In C code, prefer C23 keywords to pre-C23 macros for alignof, 184 bool, false, and true. Also, use the following C23 features if 185 available: __has_include, unreachable. 186 187 zic no longer works around Qt bug 53071, as the relevant Qt 188 releases have been out of support since 2019. This change affects 189 only fat TZif files, as thin files never had the workaround. 190 191 zdump no longer modifies the environ vector when compiled on 192 platforms lacking tm_zone or when compiled with -DUSE_LTZ=0. 193 This avoid undefined behavior on POSIX platforms. 194 195 196 Release 2022e - 2022-10-11 11:13:02 -0700 197 198 Briefly: 199 Jordan and Syria switch from +02/+03 with DST to year-round +03. 200 201 Changes to future timestamps 202 203 Jordan and Syria are abandoning the DST regime and are changing to 204 permanent +03, so they will not fall back from +03 to +02 on 205 2022-10-28. (Thanks to Steffen Thorsen and Issam Al-Zuwairi.) 206 207 Changes to past timestamps 208 209 On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00. 210 211 Changes to past time zone abbreviations and DST flags 212 213 The temporary advancement of clocks in central Mexico in summer 214 1931 is now treated as daylight saving time, instead of as two 215 changes to standard time. 216 217 218 Release 2022d - 2022-09-23 12:02:57 -0700 219 220 Briefly: 221 Palestine transitions are now Saturdays at 02:00. 222 Simplify three Ukraine zones into one. 223 224 Changes to future timestamps 225 226 Palestine now springs forward and falls back at 02:00 on the 227 first Saturday on or after March 24 and October 24, respectively. 228 This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00. 229 (Thanks to Heba Hamad.) 230 231 Changes to past timestamps 232 233 Simplify three Ukraine zones to one, since the post-1970 234 differences seem to have been imaginary. Move Europe/Uzhgorod and 235 Europe/Zaporozhye to 'backzone'; backward-compatibility links 236 still work, albeit with different timestamps before October 1991. 237 238 239 Release 2022c - 2022-08-15 17:47:18 -0700 240 241 Briefly: 242 Work around awk bug in FreeBSD, macOS, etc. 243 Improve tzselect on intercontinental Zones. 244 245 Changes to code 246 247 Work around a bug in onetrueawk that broke commands like 248 'make traditional_tarballs' on FreeBSD, macOS, etc. 249 (Problem reported by Deborah Goldsmith.) 250 251 Add code to tzselect that uses experimental structured comments in 252 zone1970.tab to clarify whether Zones like Africa/Abidjan and 253 Europe/Istanbul cross continent or ocean boundaries. 254 (Inspired by a problem reported by Peter Krefting.) 255 256 Fix bug with 'zic -d /a/b/c' when /a is unwritable but the 257 directory /a/b already exists. 258 259 Remove zoneinfo2tdf.pl, as it was unused and triggered false 260 malware alarms on some email servers. 261 262 263 Release 2022b - 2022-08-10 15:38:32 -0700 264 265 Briefly: 266 Chile's DST is delayed by a week in September 2022. 267 Iran no longer observes DST after 2022. 268 Rename Europe/Kiev to Europe/Kyiv. 269 New zic -R option 270 Vanguard form now uses %z. 271 Finish moving duplicate-since-1970 zones to 'backzone'. 272 New build option PACKRATLIST 273 New tailored_tarballs target, replacing rearguard_tarballs 274 275 Changes to future timestamps 276 277 Chile's 2022 DST start is delayed from September 4 to September 11. 278 (Thanks to Juan Correa.) 279 280 Iran plans to stop observing DST permanently, after it falls back 281 on 2022-09-21. (Thanks to Ali Mirjamali.) 282 283 Changes to past timestamps 284 285 Finish moving to 'backzone' the location-based zones whose 286 timestamps since 1970 are duplicates; adjust links accordingly. 287 This change ordinarily affects only pre-1970 timestamps, and with 288 the new PACKRATLIST option it does not affect any timestamps. 289 In this round the affected zones are Antarctica/Vostok, 290 Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, 291 Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, 292 Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, 293 Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, 294 Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, 295 Pacific/Wake and Pacific/Wallis, and the affected links are 296 Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, 297 Pacific/Truk, and Pacific/Yap. 298 299 From fall 1994 through fall 1995, Shanks wrote that Crimea's 300 DST transitions were at 02:00 standard time, not at 00:00. 301 (Thanks to Michael Deckers.) 302 303 Iran adopted standard time in 1935, not 1946. In 1977 it observed 304 DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 305 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 306 transition was on 05-27, not 03-21. 307 (Thanks to Roozbeh Pournader and Francis Santoni.) 308 309 Chile's observance of -04 from 1946-08-29 through 1947-03-31 was 310 considered DST, not standard time. Santiago and environs had moved 311 their clocks back to rejoin the rest of mainland Chile; put this 312 change at the end of 1946-08-28. (Thanks to Michael Deckers.) 313 314 Some old, small clock transitions have been removed, as people at 315 the time did not change their clocks. This affects Asia/Hong_Kong 316 in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. 317 318 Changes to zone name 319 320 Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in 321 English now. Spelling of other names in Ukraine has not yet 322 demonstrably changed in common English practice so for now these 323 names retain old spellings, as in other countries (e.g., 324 Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). 325 326 Changes to code 327 328 zic has a new option '-R @N' to output explicit transitions < N. 329 (Need suggested by Almaz Mingaleev.) 330 331 'zic -r @N' no longer outputs bad data when N < first transition. 332 (Problem introduced in 2021d and reported by Peter Krefting.) 333 334 zic now checks its input for NUL bytes and unterminated lines, and 335 now supports input line lengths up to 2048 (not 512) bytes. 336 337 gmtime and related code now use the abbreviation "UTC" not "GMT". 338 POSIX is being revised to require this. 339 340 When tzset and related functions set vestigial static variables 341 like tzname, they now prefer specified timestamps to unspecified ones. 342 (Problem reported by Almaz Mingaleev.) 343 344 zic no longer complains "can't determine time zone abbreviation to 345 use just after until time" when a transition to a new standard 346 time occurs simultaneously with the first DST fallback transition. 347 348 Changes to build procedure 349 350 Source data in vanguard form now uses the %z notation, introduced 351 in release 2015f. For example, for America/Sao_Paulo vanguard 352 form contains the zone continuation line "-3:00 Brazil %z", which 353 is simpler and more reliable than the line "-3:00 Brazil -03/-02" 354 used in main and rearguard forms. The plan is for the main form 355 to use %z eventually; in the meantime maintainers of zi parsers 356 are encouraged to test the parsers on vanguard.zi. 357 358 The Makefile has a new PACKRATLIST option to select a subset of 359 'backzone'. For example, 'make PACKRATDATA=backzone 360 PACKRATLIST=zone.tab' now generates TZif files identical to those 361 of the global-tz project. 362 363 The Makefile has a new tailored_tarballs target for generating 364 special-purpose tarballs. It generalizes and replaces the 365 rearguard_tarballs target and related targets and macros, which 366 are now obsolescent. 367 368 'make install' now defaults LOCALTIME to Factory not GMT, 369 which means the default abbreviation is now "-00" not "GMT". 370 371 Remove the posix_packrat target, marked obsolescent in 2016a. 372 373 374 Release 2022a - 2022-03-15 23:02:01 -0700 375 376 Briefly: 377 Palestine will spring forward on 2022-03-27, not -03-26. 378 zdump -v now outputs better failure indications. 379 Bug fixes for code that reads corrupted TZif data. 380 381 Changes to future timestamps 382 383 Palestine will spring forward on 2022-03-27, not 2022-03-26. 384 (Thanks to Heba Hamad.) Predict future transitions for first 385 Sunday >= March 25. Additionally, predict fallbacks to be the first 386 Friday on or after October 23, not October's last Friday, to be more 387 consistent with recent practice. The first differing fallback 388 prediction is on 2025-10-24, not 2025-10-31. 389 390 Changes to past timestamps 391 392 From 1992 through spring 1996, Ukraine's DST transitions were at 393 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) 394 395 Chile's Santiago Mean Time and its LMT precursor have been adjusted 396 eastward by 1 second to align with past and present law. 397 398 Changes to commentary 399 400 Add several references for Chile's 1946/1947 transitions, some of 401 which only affected portions of the country. 402 403 Changes to code 404 405 Fix bug when mktime gets confused by truncated TZif files with 406 unspecified local time. (Problem reported by Almaz Mingaleev.) 407 408 Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. 409 (Problem reported by Christos Zoulas.) 410 411 When reading a version 2 or later TZif file, the TZif reader now 412 validates the version 1 header and data block only enough to skip 413 over them, as recommended by RFC 8536 section 4. Also, the TZif 414 reader no longer mistakenly attempts to parse a version 1 TZIf 415 file header as a TZ string. 416 417 zdump -v now outputs "(localtime failed)" and "(gmtime failed)" 418 when local time and UT cannot be determined for a timestamp. 419 420 Changes to build procedure 421 422 Distribution tarballs now use standard POSIX.1-1988 ustar format 423 instead of GNU format. Although the formats are almost identical 424 for these tarballs, ustar headers' magic fields contain "ustar" 425 instead of "ustar ", and their version fields contain "00" instead 426 of " ". The two formats are planned to diverge more significantly 427 for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar 428 format becomes obsolete and the tarballs switch to pax format, an 429 extension of ustar. For details about these formats, please see 430 "pax - portable archive interchange", IEEE Std 1003.1-2017, 431 <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>. 432 433 434 Release 2021e - 2021-10-21 18:41:00 -0700 435 436 Changes to future timestamps 437 438 Palestine will fall back 10-29 (not 10-30) at 01:00. 439 (Thanks to P Chan and Heba Hemad.) 440 441 442 Release 2021d - 2021-10-15 13:48:18 -0700 443 444 Briefly: 445 Fiji suspends DST for the 2021/2022 season. 446 'zic -r' marks unspecified timestamps with "-00". 447 448 Changes to future timestamps 449 450 Fiji will suspend observance of DST for the 2021/2022 season. 451 Assume for now that it will return next year. (Thanks to Jashneel 452 Kumar and P Chan.) 453 454 Changes to code 455 456 'zic -r' now uses "-00" time zone abbreviations for intervals 457 with UT offsets that are unspecified due to -r truncation. 458 This implements a change in draft Internet RFC 8536bis. 459 460 461 Release 2021c - 2021-10-01 14:21:49 -0700 462 463 Briefly: 464 Revert most 2021b changes to 'backward'. 465 Fix 'zic -b fat' bug in pre-1970 32-bit data. 466 Fix two Link line typos. 467 Distribute SECURITY file. 468 469 This release is intended as a bugfix release, to fix compatibility 470 problems and typos reported since 2021b was released. 471 472 Changes to Link directives 473 474 Revert almost all of 2021b's changes to the 'backward' file, 475 by moving Link directives back to where they were in 2021a. 476 Although 'zic' doesn't care which source file contains a Link 477 directive, some downstream uses ran into trouble with the move. 478 (Problem reported by Stephen Colebourne for Joda-Time.) 479 480 Fix typo that linked Atlantic/Jan_Mayen to the wrong location 481 (problem reported by Chris Walton). 482 483 Fix 'backzone' typo that linked America/Virgin to the wrong 484 location (problem reported by Michael Deckers). 485 486 Changes to code 487 488 Fix a bug in 'zic -b fat' that caused old timestamps to be 489 mishandled in 32-bit-only readers (problem reported by Daniel 490 Fischer). 491 492 Changes to documentation 493 494 Distribute the SECURITY file (problem reported by Andreas Radke). 495 496 497 Release 2021b - 2021-09-24 16:23:00 -0700 498 499 Briefly: 500 Jordan now starts DST on February's last Thursday. 501 Samoa no longer observes DST. 502 Merge more location-based Zones whose timestamps agree since 1970. 503 Move some backward-compatibility links to 'backward'. 504 Rename Pacific/Enderbury to Pacific/Kanton. 505 Correct many pre-1993 transitions in Malawi, Portugal, etc. 506 zic now creates each output file or link atomically. 507 zic -L no longer omits the POSIX TZ string in its output. 508 zic fixes for truncation and leap second table expiration. 509 zic now follows POSIX for TZ strings using all-year DST. 510 Fix some localtime crashes and bugs in obscure cases. 511 zdump -v now outputs more-useful boundary cases. 512 tzfile.5 better matches a draft successor to RFC 8536. 513 A new file SECURITY. 514 515 This release is prompted by recent announcements by Jordan and Samoa. 516 It incorporates many other changes that had accumulated since 2021a. 517 However, it omits most proposed changes that merged all Zones 518 agreeing since 1970, as concerns were raised about doing too many of 519 these changes at once. It does keeps some of these changes in the 520 interest of making tzdb more equitable one step at a time; see 521 "Merge more location-based Zones" below. 522 523 Changes to future timestamps 524 525 Jordan now starts DST on February's last Thursday. 526 (Thanks to Steffen Thorsen.) 527 528 Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) 529 530 Changes to zone name 531 532 Rename Pacific/Enderbury to Pacific/Kanton. When we added 533 Enderbury in 1993, we did not know that it is uninhabited and that 534 Kanton (population two dozen) is the only inhabited location in 535 that timezone. The old name is now a backward-compatibility link. 536 537 Changes to past timestamps 538 539 Correct many pre-1993 transitions, fixing entries originally 540 derived from Shanks, Whitman, and Mundell. The fixes include: 541 - Barbados: standard time was introduced in 1911, not 1932; and 542 DST was observed in 1942-1944 543 - Cook Islands: In 1899 they switched from east to west of GMT, 544 celebrating Christmas for two days. They (and Niue) switched 545 to standard time in 1952, not 1901. 546 - Guyana: corrected LMT for Georgetown; the introduction of 547 standard time in 1911, not 1915; and corrections to 1975 and 548 1992 transitions 549 - Kanton: uninhabited before 1937-08-31 550 - Niue: only observed -11:20 from 1952 through 1964, then went to 551 -11 instead of -11:30 552 - Portugal: DST was observed in 1950 553 - Tonga: corrected LMT; the introduction of standard time in 1945, 554 not 1901; and corrections to the transition from +12:20 to +13 555 in 1961, not 1941 556 Additional fixes to entries in the 'backzone' file include: 557 - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 558 - The Gambia: 1933 and 1942 transitions 559 - Malawi: several 1911 through 1925 transitions 560 - Sierra Leone: several 1913 through 1941 transitions, and DST 561 was NOT observed in 1957 through 1962 562 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and 563 Alois Treindl.) 564 565 Merge more location-based Zones whose timestamps agree since 1970, 566 as pre-1970 timestamps are out of scope. This is part of a 567 process that has been ongoing since 2013. This does not affect 568 post-1970 timestamps, and timezone historians who build with 'make 569 PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. 570 When merging, keep the most-populous location's data, and move 571 data for other locations to 'backzone' with a backward 572 link in 'backward'. For example, move America/Creston data to 573 'backzone' with a link in 'backward' from America/Phoenix because 574 the two timezones' timestamps agree since 1970; this change 575 affects some pre-1968 timestamps in America/Creston because 576 Creston and Phoenix disagreed before 1968. The affected Zones 577 are Africa/Accra, America/Atikokan, America/Blanc-Sablon, 578 America/Creston, America/Curacao, America/Nassau, 579 America/Port_of_Spain, Antarctica/DumontDUrville, and 580 Antarctica/Syowa. 581 582 Changes to maintenance procedure 583 584 The new file SECURITY covers how to report security-related bugs. 585 586 Several backward-compatibility links have been moved to the 587 'backward' file. These links, which range from Africa/Addis_Ababa 588 to Pacific/Saipan, are only for compatibility with now-obsolete 589 guidelines suggesting an entry for every ISO 3166 code. 590 The intercontinental convenience links Asia/Istanbul and 591 Europe/Nicosia have also been moved to 'backward'. 592 593 Changes to code 594 595 zic now creates each output file or link atomically, 596 possibly by creating a temporary file and then renaming it. 597 This avoids races where a TZ setting would temporarily stop 598 working while zic was installing a replacement file or link. 599 600 zic -L no longer omits the POSIX TZ string in its output. 601 Starting with 2020a, zic -L truncated its output according to the 602 "Expires" directive or "#expires" comment in the leapseconds file. 603 The resulting TZif files omitted daylight saving transitions after 604 the leap second table expired, which led to far less-accurate 605 predictions of times after the expiry. Although future timestamps 606 cannot be converted accurately in the presence of leap seconds, it 607 is more accurate to convert near-future timestamps with a few 608 seconds error than with an hour error, so zic -L no longer 609 truncates output in this way. 610 611 Instead, when zic -L is given the "Expires" directive, it now 612 outputs the expiration by appending a no-change entry to the leap 613 second table. Although this should work well with most TZif 614 readers, it does not conform to Internet RFC 8536 and some pickier 615 clients (including tzdb 2017c through 2021a) reject it, so 616 "Expires" directives are currently disabled by default. To enable 617 them, set the EXPIRES_LINE Makefile variable. If a TZif file uses 618 this new feature it is marked with a new TZif version number 4, 619 a format intended to be documented in a successor to RFC 8536. 620 621 zic -L LEAPFILE -r @LO no longer generates an invalid TZif file 622 that omits leap second information for the range LO..B when LO 623 falls between two leap seconds A and B. Instead, it generates a 624 TZif version 4 file that represents the previously-missing 625 information. 626 627 The TZif reader now allows the leap second table to begin with a 628 correction other than -1 or +1, and to contain adjacent 629 transitions with equal corrections. This supports TZif version 4. 630 631 The TZif reader now lets leap seconds occur less than 28 days 632 apart. This supports possible future TZif extensions. 633 634 Fix bug that caused 'localtime' etc. to crash when TZ was 635 set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does 636 not conform to POSIX but does conform to Internet RFC 8536. 637 638 Fix another bug that caused 'localtime' etc. to crash when TZ was 639 set to a POSIX-conforming but unusual TZ string like 640 "EST5EDT4,0/0,J365/0", where almost all the year is DST. 641 642 Fix yet another bug that caused 'localtime' etc. to mishandle slim 643 TZif files containing leap seconds after the last explicit 644 transition in the table, or when handling far-future timestamps 645 in slim TZif files lacking leap seconds. 646 647 Fix localtime misbehavior involving positive leap seconds. 648 This change affects only behavior for "right" system time, 649 which contains leap seconds, and only if the UT offset is 650 not a multiple of 60 seconds when a positive leap second occurs. 651 (No such timezone exists in tzdb, luckily.) Without the fix, 652 the timestamp was ambiguous during a positive leap second. 653 With the fix, any seconds occurring after a positive leap second 654 and within the same localtime minute are counted through 60, not 655 through 59; their UT offset (tm_gmtoff) is the same as before. 656 Here is how the fix affects timestamps in a timezone with UT 657 offset +01:23:45 (5025 seconds) and with a positive leap second at 658 1972-06-30 23:59:60 UTC (78796800): 659 660 time_t without the fix with the fix 661 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 662 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 663 ... 664 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 665 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 666 667 Fix an unlikely bug that caused 'localtime' etc. to misbehave if 668 civil time changes a few seconds before time_t wraps around, when 669 leap seconds are enabled. 670 671 Fix bug in zic -r; in some cases, the dummy time type after the 672 last time transition disagreed with the TZ string, contrary to 673 Internet RFC 8563 section 3.3. 674 675 Fix a bug with 'zic -r @X' when X is a negative leap second that 676 has a nonnegative correction. Without the fix, the output file 677 was truncated so that X appeared to be a positive leap second. 678 Fix a similar, even-less-likely bug when truncating at a positive 679 leap second that has a nonpositive correction. 680 681 zic -r now reports an error if given rolling leap seconds, as this 682 usage has never generally worked and is evidently unused. 683 684 zic now generates a POSIX-conforming TZ string for TZif files 685 where all-year DST is predicted for the indefinite future. 686 For example, for all-year Eastern Daylight Time, zic now generates 687 "XXX3EDT4,0/0,J365/23" where it previously generated 688 "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for 689 noting the possibility of POSIX conformance.) 690 691 zic.c no longer requires sys/wait.h (thanks to spazmodius for 692 noting it wasn't needed). 693 694 When reading slim TZif files, zdump no longer mishandles leap 695 seconds on the rare platforms where time_t counts leap seconds, 696 fixing a bug introduced in 2014g. 697 698 zdump -v now outputs timestamps at boundaries of what localtime 699 and gmtime can represent, instead of the less-useful timestamps 700 one day after the minimum and one day before the maximum. 701 (Thanks to Arthur David Olson for prototype code, and to Manuela 702 Friedrich for debugging help.) 703 704 zdump's -c and -t options are now consistently inclusive for the 705 lower time bound and exclusive for the upper. Formerly they were 706 inconsistent. (Confusion noted by Martin Burnicki.) 707 708 Changes to build procedure 709 710 You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to 711 non-POSIX hosts where malloc doesn't set errno. 712 (Problem reported by Jan Engelhardt.) 713 714 Changes to documentation 715 716 tzfile.5 better matches a draft successor to RFC 8536 717 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>. 718 719 720 Release 2021a - 2021-01-24 10:54:57 -0800 721 722 Changes to future timestamps 723 724 South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. 725 (Thanks to Steffen Thorsen.) 726 727 728 Release 2020f - 2020-12-29 00:17:46 -0800 729 730 Change to build procedure 731 732 'make rearguard_tarballs' no longer generates a bad rearguard.zi, 733 fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) 734 735 736 Release 2020e - 2020-12-22 15:14:34 -0800 737 738 Briefly: 739 Volgograd switches to Moscow time on 2020-12-27 at 02:00. 740 741 Changes to future timestamps 742 743 Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. 744 (Thanks to Alexander Krivenyshev and Stepan Golosunov.) 745 746 Changes to past timestamps 747 748 Correct many pre-1986 transitions, fixing entries originally 749 derived from Shanks. The fixes include: 750 - Australia: several 1917 through 1971 transitions 751 - The Bahamas: several 1941 through 1945 transitions 752 - Bermuda: several 1917 through 1956 transitions 753 - Belize: several 1942 through 1968 transitions 754 - Ghana: several 1915 through 1956 transitions 755 - Israel and Palestine: several 1940 through 1985 transitions 756 - Kenya and adjacent: several 1908 through 1960 transitions 757 - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 758 through 1919 transitions 759 - Seychelles: the introduction of standard time in 1907, not 1906 760 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition 761 (Thanks to P Chan.) 762 763 Because of the Australia change, Australia/Currie (King Island) is 764 no longer needed, as it is identical to Australia/Hobart for all 765 timestamps since 1970 and was therefore created by mistake. 766 Australia/Currie has been moved to the 'backward' file and its 767 corrected data moved to the 'backzone' file. 768 769 Changes to past time zone abbreviations and DST flags 770 771 To better match legislation in Turks and Caicos, the 2015 shift to 772 year-round observance of -04 is now modeled as AST throughout before 773 returning to Eastern Time with US DST in 2018, rather than as 774 maintaining EDT until 2015-11-01. (Thanks to P Chan.) 775 776 Changes to documentation 777 778 The zic man page now documents zic's coalescing of transitions 779 when a zone falls back just before DST springs forward. 780 781 782 Release 2020d - 2020-10-21 11:24:13 -0700 783 784 Briefly: 785 Palestine ends DST earlier than predicted, on 2020-10-24. 786 787 Changes to past and future timestamps 788 789 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 790 as previously predicted (thanks to Sharef Mustafa.) Its 791 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen 792 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and 793 its spring 2020 transition was on March 28 at 00:00, not March 27 794 (thanks to Pierre Cashon.) This affects Asia/Gaza and 795 Asia/Hebron. Assume future spring and fall transitions will be on 796 the Saturday preceding the last Sunday of March and October, 797 respectively. 798 799 800 Release 2020c - 2020-10-16 11:15:53 -0700 801 802 Briefly: 803 Fiji starts DST later than usual, on 2020-12-20. 804 805 Changes to future timestamps 806 807 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as 808 previously predicted. DST will still end on 2021-01-17. 809 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that 810 the later-than-usual start date is a one-time departure from the 811 recent pattern. 812 813 Changes to build procedure 814 815 Rearguard tarballs now contain an empty file pacificnew. 816 Some older downstream software expects this file to exist. 817 (Problem reported by Mike Cullinan.) 818 819 820 Release 2020b - 2020-10-06 18:35:04 -0700 821 822 Briefly: 823 Revised predictions for Morocco's changes starting in 2023. 824 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. 825 Macquarie Island has stayed in sync with Tasmania since 2011. 826 Casey, Antarctica is at +08 in winter and +11 in summer. 827 zic no longer supports -y, nor the TYPE field of Rules. 828 829 Changes to future timestamps 830 831 Morocco's spring-forward after Ramadan is now predicted to occur 832 no sooner than two days after Ramadan, instead of one day. 833 (Thanks to Milamber.) The first altered prediction is for 2023, 834 now predicted to spring-forward on April 30 instead of April 23. 835 836 Changes to past and future timestamps 837 838 Casey Station, Antarctica has been using +08 in winter and +11 in 839 summer since 2018. The most recent transition from +08 to +11 was 840 2020-10-04 00:01. Also, Macquarie Island has been staying in 841 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) 842 843 Changes to past and future time zone abbreviations and DST flags 844 845 Canada's Yukon, represented by America/Whitehorse and 846 America/Dawson, changes its time zone rules from -08/-07 to 847 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. 848 This change affects only the time zone abbreviation (MST vs PDT) 849 and daylight saving flag for the period between the two dates. 850 (Thanks to Andrew G. Smith.) 851 852 Changes to past timestamps 853 854 Correct several transitions for Hungary for 1918/1983. 855 For example, the 1983-09-25 fall-back was at 01:00, not 03:00. 856 (Thanks to Gza Nyry.) Also, the 1890 transition to standard 857 time was on 11-01, not 10-01 (thanks to Michael Deckers). 858 859 The 1891 French transition was on March 16, not March 15. The 860 1911-03-11 French transition was at midnight, not a minute later. 861 Monaco's transitions were on 1892-06-01 and 1911-03-29, not 862 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) 863 864 Changes to code 865 866 Support for zic's long-obsolete '-y YEARISTYPE' option has been 867 removed and, with it, so has support for the TYPE field in Rule 868 lines, which is now reserved for compatibility with earlier zic. 869 These features were previously deprecated in release 2015f. 870 (Thanks to Tim Parenti.) 871 872 zic now defaults to '-b slim' instead of to '-b fat'. 873 874 zic's new '-l -' and '-p -' options uninstall any existing 875 localtime and posixrules files, respectively. 876 877 The undocumented and ineffective tzsetwall function has been 878 removed. 879 880 Changes to build procedure 881 882 The Makefile now defaults POSIXRULES to '-', so the posixrules 883 feature (obsolete as of 2019b) is no longer installed by default. 884 885 Changes to documentation and commentary 886 887 The long-obsolete files pacificnew, systemv, and yearistype.sh have 888 been removed from the distribution. (Thanks to Tim Parenti.) 889 890 891 Release 2020a - 2020-04-23 16:03:47 -0700 892 893 Briefly: 894 Morocco springs forward on 2020-05-31, not 2020-05-24. 895 Canada's Yukon advanced to -07 year-round on 2020-03-08. 896 America/Nuuk renamed from America/Godthab. 897 zic now supports expiration dates for leap second lists. 898 899 Changes to future timestamps 900 901 Morocco's second spring-forward transition in 2020 will be May 31, 902 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) 903 Adjust future-year predictions to use the first Sunday after the 904 day after Ramadan, not the first Sunday after Ramadan. 905 906 Canada's Yukon, represented by America/Whitehorse and 907 America/Dawson, advanced to -07 year-round, beginning with its 908 spring-forward transition on 2020-03-08, and will not fall back on 909 2020-11-01. Although a government press release calls this 910 "permanent Pacific Daylight Saving Time", we prefer MST for 911 consistency with nearby Dawson Creek, Creston, and Fort Nelson. 912 (Thanks to Tim Parenti.) 913 914 Changes to past timestamps 915 916 Shanghai observed DST in 1919. (Thanks to Phake Nick.) 917 918 Changes to timezone identifiers 919 920 To reflect current usage in English better, America/Godthab has 921 been renamed to America/Nuuk. A backwards-compatibility link 922 remains for the old name. 923 924 Changes to code 925 926 localtime.c no longer mishandles timestamps after the last 927 transition in a TZif file with leap seconds and with daylight 928 saving time transitions projected into the indefinite future. 929 For example, with TZ='America/Los_Angeles' with leap seconds, 930 zdump formerly reported a DST transition on 2038-03-14 931 from 01:59:32.999... to 02:59:33 instead of the correct transition 932 from 01:59:59.999... to 03:00:00. 933 934 zic -L now supports an Expires line in the leapseconds file, and 935 truncates the TZif output accordingly. This propagates leap 936 second expiration information into the TZif file, and avoids the 937 abovementioned localtime.c bug as well as similar bugs present in 938 many client implementations. If no Expires line is present, zic 939 -L instead truncates the TZif output based on the #expires comment 940 present in leapseconds files distributed by tzdb 2018f and later; 941 however, this usage is obsolescent. For now, the distributed 942 leapseconds file has an Expires line that is commented out, so 943 that the file can be fed to older versions of zic which ignore the 944 commented-out line. Future tzdb distributions are planned to 945 contain a leapseconds file with an Expires line. 946 947 The configuration macros HAVE_TZNAME and USG_COMPAT should now be 948 set to 1 if the system library supports the feature, and 2 if not. 949 As before, these macros are nonzero if tzcode should support the 950 feature, zero otherwise. 951 952 The configuration macro ALTZONE now has the same values with the 953 same meaning as HAVE_TZNAME and USG_COMPAT. 954 955 The code's defense against CRLF in leap-seconds.list is now 956 portable to POSIX awk. (Problem reported by Deborah Goldsmith.) 957 958 Although the undocumented tzsetwall function is not changed in 959 this release, it is now deprecated in preparation for removal in 960 future releases. Due to POSIX requirements, tzsetwall has not 961 worked for some time. Any code that uses it should instead use 962 tzalloc(NULL) or, if portability trumps thread-safety, should 963 unset the TZ environment variable. 964 965 Changes to commentary 966 967 The les-de-la-Madeleine and the Listuguj reserve are noted as 968 following America/Halifax, and comments about Yukon's "south" and 969 "north" have been corrected to say "east" and "west". (Thanks to 970 Jeffery Nichols.) 971 972 973 Release 2019c - 2019-09-11 08:59:48 -0700 974 975 Briefly: 976 Fiji observes DST from 2019-11-10 to 2020-01-12. 977 Norfolk Island starts observing Australian-style DST. 978 979 Changes to future timestamps 980 981 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 982 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) 983 Adjust future guesses accordingly. 984 985 Norfolk Island will observe Australian-style DST starting in 986 spring 2019. The first transition is on 2019-10-06. (Thanks to 987 Kyle Czech and Michael Deckers.) 988 989 Changes to past timestamps 990 991 Many corrections to time in Turkey from 1940 through 1985. 992 (Thanks to Oya Vula via Alois Treindl, and to Kvan Yazan.) 993 994 The Norfolk Island 1975-03-02 transition was at 02:00 standard 995 time, not 02:00 DST. (Thanks to Michael Deckers.) 996 997 South Korea observed DST from 1948 through 1951. Although this 998 info was supposed to appear in release 2014j, a typo inadvertently 999 suppressed the change. (Thanks to Alois Treindl.) 1000 1001 Detroit observed DST in 1967 and 1968 following the US DST rules, 1002 except that its 1967 DST began on June 14 at 00:01. (Thanks to 1003 Alois Treindl for pointing out that the old data entries were 1004 probably wrong.) 1005 1006 Fix several errors in pre-1970 transitions in Perry County, IN. 1007 (Thanks to Alois Treindl for pointing out the 1967/9 errors.) 1008 1009 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver 1010 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 1011 10-06. In 1945 Knigsberg (now Kaliningrad) switched from +01/+02 1012 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated 1013 EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 1014 Knigsberg switched to +03 on 04-07 not 01-01. 1015 1016 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 1017 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) 1018 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. 1019 1020 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. 1021 (Thanks to Michael Deckers.) 1022 1023 Changes to past time zone abbreviations and DST flags 1024 1025 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, 1026 is now flagged as DST and is abbreviated HKWT not HKT. 1027 1028 Changes to code 1029 1030 leapseconds.awk now relies only on its input data, rather than 1031 also relying on its comments. (Inspired by code from Dennis 1032 Ferguson and Chris Woodbury.) 1033 1034 The code now defends against CRLFs in leap-seconds.list. 1035 (Thanks to Brian Inglis and Chris Woodbury.) 1036 1037 Changes to documentation and commentary 1038 1039 theory.html discusses leap seconds. (Thanks to Steve Summit.) 1040 1041 Nashville's newspapers dueled about the time of day in the 1950s. 1042 (Thanks to John Seigenthaler.) 1043 1044 Liechtenstein observed Swiss DST in 1941/2. 1045 (Thanks to Alois Treindl.) 1046 1047 1048 Release 2019b - 2019-07-01 00:09:53 -0700 1049 1050 Briefly: 1051 Brazil no longer observes DST. 1052 'zic -b slim' outputs smaller TZif files; please try it out. 1053 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 1054 1055 Changes to future timestamps 1056 1057 Brazil has canceled DST and will stay on standard time indefinitely. 1058 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 1059 Oliveira.) 1060 1061 Predictions for Morocco now go through 2087 instead of 2037, to 1062 work around a problem on newlib when using TZif files output by 1063 zic 2019a or earlier. (Problem reported by David Gauchard.) 1064 1065 Changes to past and future timestamps 1066 1067 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 1068 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 1069 future transitions to be March's last Friday at 00:00. 1070 1071 Changes to past timestamps 1072 1073 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 1074 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 1075 not 09-15 at 00:00. In 1946 its spring-forward transition was on 1076 04-21 at 00:00, not the previous day at 03:30. From 1946 through 1077 1952 its fall-back transitions occurred at 04:30, not at 03:30. 1078 In 1947 its fall-back transition was on 11-30, not 12-30. 1079 (Thanks to P Chan.) 1080 1081 Changes to past time zone abbreviations 1082 1083 Italy's 1866 transition to Rome Mean Time was on December 12, not 1084 September 22. This affects only the time zone abbreviation for 1085 Europe/Rome between those dates. (Thanks to Stephen Trainor and 1086 Luigi Rosa.) 1087 1088 Changes affecting metadata only 1089 1090 Add info about the Crimea situation in zone1970.tab and zone.tab. 1091 (Problem reported by Serhii Demediuk.) 1092 1093 Changes to code 1094 1095 zic's new -b option supports a way to control data bloat and to 1096 test for year-2038 bugs in software that reads TZif files. 1097 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 1098 for example, changing from fat to slim shrinks the Europe/London 1099 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 1100 files represent the same set of timestamps and use the same TZif 1101 format as documented in tzfile(5) and in Internet RFC 8536. 1102 Fat format attempts to work around bugs or incompatibilities in 1103 older software, notably software that mishandles 64-bit TZif data 1104 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 1105 Slim format is more efficient and does not work around 64-bit bugs 1106 or obsolete TZ strings. Currently zic defaults to fat format 1107 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 1108 out-of-the-box default is intended to change in future releases 1109 as the buggy software often mishandles timestamps anyway. 1110 1111 zic no longer treats a set of rules ending in 2037 specially. 1112 Previously, zic assumed that such a ruleset meant that future 1113 timestamps could not be predicted, and therefore omitted a 1114 POSIX-like TZ string in the TZif output. The old behavior is no 1115 longer needed for current tzdata, and caused problems with newlib 1116 when used with older tzdata (reported by David Gauchard). 1117 1118 zic no longer generates some artifact transitions. For example, 1119 Europe/London no longer has a no-op transition in January 1996. 1120 1121 Changes to build procedure 1122 1123 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 1124 by a percent or so. 1125 1126 Changes to documentation and commentary 1127 1128 The Makefile now documents the POSIXRULES macro as being obsolete, 1129 and similarly, zic's -p POSIXRULES option is now documented as 1130 being obsolete. Although the POSIXRULES feature still exists and 1131 works as before, in practice it is rarely used for its intended 1132 purpose, and it does not work either in the default reference 1133 implementation (for timestamps after 2037) or in common 1134 implementations such as GNU/Linux (for contemporary timestamps). 1135 Since POSIXRULES was designed primarily as a temporary transition 1136 facility for System V platforms that died off decades ago, it is 1137 being decommissioned rather than institutionalized. 1138 1139 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 1140 1141 1142 Release 2019a - 2019-03-25 22:01:33 -0700 1143 1144 Briefly: 1145 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 1146 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 1147 1148 Changes to past and future timestamps 1149 1150 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 1151 previously predicted. Adjust our prediction by guessing that spring 1152 transitions will be between 24 and 30 March, which matches recent practice 1153 since 2016. (Thanks to Even Scharning and Tim Parenti.) 1154 1155 Metlakatla ended its observance of Pacific standard time, 1156 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 1157 Stanley and Tim Parenti.) 1158 1159 Changes to past timestamps 1160 1161 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 1162 (Thanks to Alois Treindl and Isaac Starkman.) 1163 1164 Changes to time zone abbreviations 1165 1166 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 1167 of being a separate zone that generates the abbreviation "UCT", 1168 which nowadays is typically a typo. (Problem reported by Isiah 1169 Meadows.) 1170 1171 Changes to code 1172 1173 zic now has an -r option to limit the time range of output data. 1174 For example, 'zic -r @1000000000' limits the output data to 1175 timestamps starting 1000000000 seconds after the Epoch. 1176 This helps shrink output size and can be useful for applications 1177 not needing the full timestamp history, such as TZDIST truncation; 1178 see Internet RFC 8536 section 5.1. (Inspired by a feature request 1179 from Christopher Wong, helped along by bug reports from Wong and 1180 from Tim Parenti.) 1181 1182 Changes to documentation 1183 1184 Mention Internet RFC 8536 (February 2019), which documents TZif. 1185 1186 tz-link.html now cites tzdata-meta 1187 <https://tzdata-meta.timtimeonline.com/>. 1188 1189 1190 Release 2018i - 2018-12-30 11:05:43 -0800 1191 1192 Briefly: 1193 So Tom and Prncipe switches from +01 to +00 on 2019-01-01. 1194 1195 Changes to future timestamps 1196 1197 Due to a change in government, So Tom and Prncipe switches back 1198 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 1199 Nasardinov and Michael Deckers.) 1200 1201 1202 Release 2018h - 2018-12-23 17:59:32 -0800 1203 1204 Briefly: 1205 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 1206 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 1207 Metlakatla, Alaska observes PST this winter only. 1208 Guess Morocco will continue to adjust clocks around Ramadan. 1209 Add predictions for Iran from 2038 through 2090. 1210 1211 Changes to future timestamps 1212 1213 Guess that Morocco will continue to fall back just before and 1214 spring forward just after Ramadan, the practice since 2012. 1215 (Thanks to Maamar Abdelkader.) This means Morocco will observe 1216 negative DST during Ramadan in main and vanguard formats, and in 1217 rearguard format it stays in the +00 timezone and observes 1218 ordinary DST in all months other than Ramadan. As before, extend 1219 this guesswork to the year 2037. As a consequence, Morocco is 1220 scheduled to observe three DST transitions in some Gregorian years 1221 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 1222 calendars. 1223 1224 The table of exact transitions for Iranian DST has been extended. 1225 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 1226 It now cuts off before 2091 as there is doubt about how the Persian 1227 calendar will treat 2091. This change predicts DST transitions in 1228 2038-9, 2042-3, and 2046-7 to occur one day later than previously 1229 predicted. As before, post-cutoff transitions are approximated. 1230 1231 Changes to past and future timestamps 1232 1233 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 1234 +05 on 2018-12-21. This is a zone split as Qostanay (aka 1235 Kostanay) did not switch, so create a zone Asia/Qostanay. 1236 1237 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 1238 It did not change clocks that day and remains on -08 this winter. 1239 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 1240 rules next spring, so this change affects only timestamps 1241 from 2018-11-04 through 2019-03-10. 1242 1243 Change to past timestamps 1244 1245 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 1246 not 00:00. I transcribed the time incorrectly from Shanks. 1247 (Thanks to Phake Nick.) 1248 1249 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 1250 (Thanks to Phake Nick.) 1251 1252 Guam observed DST irregularly from 1959 through 1977. 1253 (Thanks to Phake Nick.) 1254 1255 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 1256 10-01 changed standard time to +08:30 (not +08). Its transition 1257 back to +08 after WWII was on 1945-09-15, not the previous day. 1258 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 1259 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 1260 its 1952 fallback was on 11-02 (not 10-25). 1261 1262 This release contains many changes to timestamps before 1946 due 1263 to Japanese possession or occupation of Pacific/Chuuk, 1264 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 1265 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 1266 (Thanks to Phake Nick.) 1267 1268 Assume that the Spanish East Indies was like the Philippines and 1269 observed American time until the end of 1844. This affects 1270 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 1271 1272 Changes to past tm_isdst flags 1273 1274 For the recent Morocco change, the tm_isdst flag should be 1 from 1275 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 1276 Give a URL to the official decree. (Thanks to Matt Johnson.) 1277 1278 1279 Release 2018g - 2018-10-26 22:22:45 -0700 1280 1281 Briefly: 1282 Morocco switches to permanent +01 on 2018-10-28. 1283 1284 Changes to future timestamps 1285 1286 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 1287 so its clocks will not fall back as previously scheduled. 1288 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 1289 1290 Changes to code 1291 1292 When generating TZif files with leap seconds, zic no longer uses a 1293 format that trips up older 32-bit clients, fixing a bug introduced 1294 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 1295 for QTBUG-53071 now also works for TZif files with leap seconds. 1296 1297 The translator to rearguard format now rewrites the line 1298 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 1299 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 1300 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 1301 and earlier. (Reported by Christos Zoulas.) 1302 1303 Changes to past time zone abbreviations 1304 1305 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 1306 This reverts to 2011h, as the abbreviation change in 2011i was 1307 likely inadvertent. 1308 1309 Changes to documentation 1310 1311 tzfile.5 has new sections on interoperability issues. 1312 1313 1314 Release 2018f - 2018-10-18 00:14:18 -0700 1315 1316 Briefly: 1317 Volgograd moves from +03 to +04 on 2018-10-28. 1318 Fiji ends DST 2019-01-13, not 2019-01-20. 1319 Most of Chile changes DST dates, effective 2019-04-06. 1320 1321 Changes to future timestamps 1322 1323 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 1324 (Thanks to Alexander Fetisov and Stepan Golosunov.) 1325 1326 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 1327 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 1328 accordingly. 1329 1330 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 1331 time, and resume DST on the first Saturday in September at 24:00 mainland 1332 time. The changes are effective from 2019-04-06, and do not affect the 1333 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 1334 and Tim Parenti.) Adjust future predictions accordingly. 1335 1336 Changes to past timestamps 1337 1338 The 2018-05-05 North Korea 30-minute time zone change took place 1339 at 23:30 the previous day, not at 00:00 that day. 1340 1341 China's 1988 spring-forward transition was on April 17, not 1342 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 1343 (Thanks to P Chan.) 1344 1345 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 1346 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 1347 temporarily switched to +09/+10 during World War II. Macau 1348 observed DST in 1942/79, not 1961/80, and there were several 1349 errors for transition times and dates. (Thanks to P Chan.) 1350 1351 The 1948-1951 fallback transitions in Japan were at 25:00 on 1352 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 1353 zic turns this into 01:00 on the day after September's second 1354 Saturday, which is the best that POSIX or C platforms can do. 1355 1356 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 1357 paper by Li Yu, replacing more-questionable data from Shanks. 1358 1359 Changes to time zone abbreviations 1360 1361 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 1362 1363 Changes to code 1364 1365 zic now always generates TZif files where time type 0 is used for 1366 timestamps before the first transition. This simplifies the 1367 reading of TZif files and should not affect behavior of existing 1368 TZif readers because the same set of time types is used; only 1369 their internal indexes may have changed. This affects only the 1370 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 1371 EET, which previously used nonzero types for these timestamps. 1372 1373 Because of the type 0 change, zic no longer outputs a dummy 1374 transition at time -2**59 (before the Big Bang), as clients should 1375 no longer need this to handle historical timestamps correctly. 1376 This reverts a change introduced in 2013d and shrinks most TZif 1377 files by a few bytes. 1378 1379 zic now supports negative time-of-day in Rule and Leap lines, e.g., 1380 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 1381 occurs at 18:00 on the Saturday before the last Sunday in April. 1382 This behavior was documented in 2018a but the code did not 1383 entirely match the documentation. 1384 1385 localtime.c no longer requires at least one time type in TZif 1386 files that lack transitions or have a POSIX-style TZ string. This 1387 future-proofs the code against possible future extensions to the 1388 format that would allow TZif files with POSIX-style TZ strings and 1389 without transitions or time types. 1390 1391 A read-access subscript error in localtime.c has been fixed. 1392 It could occur only in TZif files with timecnt == 0, something that 1393 does not happen in practice now but could happen in future versions. 1394 1395 localtime.c no longer ignores TZif POSIX-style TZ strings that 1396 specify only standard time. Instead, these TZ strings now 1397 override the default time type for timestamps after the last 1398 transition (or for all timestamps if there are no transitions), 1399 just as DST strings specifying DST have always done. 1400 1401 leapseconds.awk now outputs "#updated" and "#expires" comments, 1402 and supports leap seconds at the ends of months other than June 1403 and December. (Inspired by suggestions from Chris Woodbury.) 1404 1405 Changes to documentation 1406 1407 New restrictions: A Rule name must start with a character that 1408 is neither an ASCII digit nor "-" nor "+", and an unquoted name 1409 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 1410 The latter restriction makes room for future extensions (a 1411 possibility noted by Tom Lane). 1412 1413 tzfile.5 now documents what time types apply before the first and 1414 after the last transition, if any. 1415 1416 Documentation now uses the spelling "timezone" for a TZ setting 1417 that determines timestamp history, and "time zone" for a 1418 geographic region currently sharing the same standard time. 1419 1420 The name "TZif" is now used for the tz binary data format. 1421 1422 tz-link.htm now mentions the A0 TimeZone Migration utilities. 1423 (Thanks to Aldrin Martoq for the link.) 1424 1425 Changes to build procedure 1426 1427 New 'make' target 'rearguard_tarballs' to build the rearguard 1428 tarball only. This is a convenience on platforms that lack lzip 1429 if you want to build the rearguard tarball. (Problem reported by 1430 Deborah Goldsmith.) 1431 1432 tzdata.zi is now more stable from release to release. (Problem 1433 noted by Tom Lane.) It is also a bit shorter. 1434 1435 tzdata.zi now can contain comment lines documenting configuration 1436 information, such as which data format was selected, which input 1437 files were used, and how leap seconds are treated. (Problems 1438 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 1439 are used these comment lines are absent, for backward 1440 compatibility. A redistributor intending to alter its copy of the 1441 files should also append "-LABEL" to the 'version' file's first 1442 line, where "LABEL" identifies the redistributor's change. 1443 1444 1445 Release 2018e - 2018-05-01 23:42:51 -0700 1446 1447 Briefly: 1448 1449 North Korea switches back to +09 on 2018-05-05. 1450 The main format uses negative DST again, for Ireland etc. 1451 'make tarballs' now also builds a rearguard tarball. 1452 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 1453 1454 Changes to past and future timestamps 1455 1456 North Korea switches back from +0830 to +09 on 2018-05-05. 1457 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 1458 and Tim Parenti.) 1459 1460 Bring back the negative-DST changes of 2018a, except be more 1461 compatible with data parsers that do not support negative DST. 1462 Also, this now affects historical timestamps in Namibia and the 1463 former Czechoslovakia, not just Ireland. The main format now uses 1464 negative DST to model timestamps in Europe/Dublin (from 1971 on), 1465 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 1466 does not affect UT offsets, only time zone abbreviations and the 1467 tm_isdst flag. Also, this does not affect rearguard or vanguard 1468 formats; effectively the main format now uses vanguard instead of 1469 rearguard format. Data parsers that do not support negative DST 1470 can still use data from the rearguard tarball described below. 1471 1472 Changes to build procedure 1473 1474 The command 'make tarballs' now also builds the tarball 1475 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 1476 except that it uses rearguard format intended for trailing-edge 1477 data parsers. 1478 1479 Changes to data format and to code 1480 1481 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 1482 suffix, which specifies whether the adjusted time is standard time 1483 or daylight saving time. If no suffix is given, daylight saving 1484 time is used if and only if the SAVE column is nonzero; this is 1485 the longstanding behavior. Although this new feature is not used 1486 in tzdata, it could be used to specify the legal time in Namibia 1487 1994-2017, as opposed to the popular time (see below). 1488 1489 Changes to past timestamps 1490 1491 From 1994 through 2017 Namibia observed DST in winter, not summer. 1492 That is, it used negative DST, as Ireland still does. This change 1493 does not affect UTC offsets; it affects only the tm_isdst flag and 1494 the abbreviation used during summer, which is now CAT, not WAST. 1495 Although (as noted by Michael Deckers) summer and winter time were 1496 both simply called "standard time" in Namibian law, in common 1497 practice winter time was considered to be DST (as noted by Stephen 1498 Colebourne). The full effect of this change is only in vanguard 1499 and main format; in rearguard format, the tm_isdst flag is still 1500 zero in winter and nonzero in summer. 1501 1502 In 1946/7 Czechoslovakia also observed negative DST in winter. 1503 The full effect of this change is only in vanguard and main 1504 formats; in rearguard format, it is modeled as plain GMT without 1505 daylight saving. Also, the dates of some 1944/5 DST transitions 1506 in Czechoslovakia have been changed. 1507 1508 1509 Release 2018d - 2018-03-22 07:05:46 -0700 1510 1511 Briefly: 1512 1513 Palestine starts DST a week earlier in 2018. 1514 Add support for vanguard and rearguard data consumers. 1515 Add subsecond precision to source data format, though not to data. 1516 1517 Changes to future timestamps 1518 1519 In 2018, Palestine starts DST on March 24, not March 31. 1520 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 1521 1522 Changes to past and future timestamps 1523 1524 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 1525 at 04:00. (Thanks to Steffen Thorsen.) 1526 1527 Changes to past timestamps 1528 1529 Historical transitions for Uruguay, represented by 1530 America/Montevideo, have been updated per official legal documents, 1531 replacing previous data mainly originating from the inventions of 1532 Shanks & Pottenger. This has resulted in adjustments ranging from 1533 30 to 90 minutes in either direction over at least two dozen 1534 distinct periods ranging from one day to several years in length. 1535 A mere handful of pre-1991 transitions are unaffected; data since 1536 then has come from more reliable contemporaneous reporting. These 1537 changes affect various timestamps in 1920-1923, 1936, 1939, 1538 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 1539 Additionally, Uruguay's pre-standard-time UT offset has been 1540 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 1541 match the location of the Observatory of the National Meteorological 1542 Institute in Montevideo. 1543 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 1544 1545 East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. 1546 (Thanks to Kerry Shetline.) 1547 1548 Fix the 1912-01-01 transition for Portugal and its colonies. 1549 This transition was at 00:00 according to the new UT offset, not 1550 according to the old one. Also assume that Cape Verde switched on 1551 the same date as the rest, not in 1907. This affects 1552 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 1553 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 1554 (Thanks to Michael Deckers.) 1555 1556 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 1557 Turks & Caicos. 1558 1559 Changes to past time zone abbreviations 1560 1561 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 1562 is no clock change associated with the transition. 1563 1564 Changes to build procedure 1565 1566 The new DATAFORM macro in the Makefile lets the installer choose 1567 among three source data formats. The idea is to lessen downstream 1568 disruption when data formats are improved. 1569 1570 * DATAFORM=vanguard installs from the latest, bleeding-edge 1571 format. DATAFORM=main (the default) installs from the format 1572 used in the 'africa' etc. files. DATAFORM=rearguard installs 1573 from a trailing-edge format. Eventually, elements of today's 1574 vanguard format should move to the main format, and similarly 1575 the main format's features should eventually move to the 1576 rearguard format. 1577 1578 * In the current version, the main and rearguard formats are 1579 identical and match that of 2018c, so this change does not 1580 affect default behavior. The vanguard format currently contains 1581 one feature not in the main format: negative SAVE values. This 1582 improves support for Ireland, which uses Irish Standard Time 1583 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 1584 supported negative SAVE values for decades, and this feature 1585 should move to the main format soon. However, it will not move 1586 to the rearguard format for quite some time because some 1587 downstream parsers do not support it. 1588 1589 * The build procedure constructs three files vanguard.zi, main.zi, 1590 and rearguard.zi, one for each format. Although the files 1591 represent essentially the same data, they may have minor 1592 discrepancies that users are not likely to notice. The files 1593 are intended for downstream data consumers and are not 1594 installed. Zoneinfo parsers that do not support negative SAVE values 1595 should start using rearguard.zi, so that they will be unaffected 1596 when the negative-DST feature moves from vanguard to main. 1597 Bleeding-edge Zoneinfo parsers that support the new features 1598 already can use vanguard.zi; in this respect, current tzcode is 1599 bleeding-edge. 1600 1601 The Makefile should now be safe for parallelized builds, and 'make 1602 -j to2050new.tzs' is now much faster on a multiprocessor host 1603 with GNU Make. 1604 1605 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 1606 prepends TZDIR/ to file names that do not begin with '/'. This is 1607 not recommended for general use, due to its security implications. 1608 (From a suggestion by Manuela Friedrich.) 1609 1610 Changes to code 1611 1612 zic now accepts subsecond precision in expressions like 1613 00:19:32.13, which is approximately the legal time of the 1614 Netherlands from 1835 to 1937. However, because it is 1615 questionable whether the few recorded uses of non-integer offsets 1616 had subsecond precision in practice, there are no plans for tzdata 1617 to use this feature. (Thanks to Steve Allen for pointing out 1618 the limitations of historical data in this area.) 1619 1620 The code is a bit more portable to MS-Windows. Installers can 1621 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 1622 reserve identifiers like 'localtime'. (Thanks to Manuela 1623 Friedrich.) 1624 1625 Changes to documentation and commentary 1626 1627 theory.html now outlines tzdb's extensions to POSIX's model for 1628 civil time, and has a section "POSIX features no longer needed" 1629 that lists POSIX API components that are now vestigial. 1630 (From suggestions by Steve Summit.) It also better distinguishes 1631 time zones from tz regions. (From a suggestion by Guy Harris.) 1632 1633 Commentary is now more consistent about using the phrase "daylight 1634 saving time", to match the C name tm_isdst. Daylight saving time 1635 need not occur in summer, and need not have a positive offset from 1636 standard time. 1637 1638 Commentary about historical transitions in Uruguay has been expanded 1639 with links to many relevant legal documents. 1640 (Thanks to Tim Parenti.) 1641 1642 Commentary now uses some non-ASCII characters with Unicode value 1643 less than U+0100, as they can be useful and should work even with 1644 older editors such as XEmacs. 1645 1646 1647 Release 2018c - 2018-01-22 23:00:44 -0800 1648 1649 Briefly: 1650 Revert Irish changes that relied on negative SAVE values. 1651 1652 Changes to tm_isdst 1653 1654 Revert the 2018a change to Europe/Dublin. As before, this change 1655 does not affect UT offsets or abbreviations; it affects only 1656 whether timestamps are considered to be standard time or 1657 daylight-saving time, as expressed in the tm_isdst flag of C's 1658 struct tm type. This reversion is intended to be a temporary 1659 workaround for problems discovered with downstream uses of 1660 releases 2018a and 2018b, which implemented Irish time by using 1661 negative SAVE values in the Eire rules of the 'europe' file. 1662 Although negative SAVE values have been part of tzcode for many 1663 years and are supported by many platforms, they were not 1664 documented before 2018a and ICU and OpenJDK do not currently 1665 support them. A mechanism to export data to platforms lacking 1666 support for negative DST is planned to be developed before the 1667 change is reapplied. (Problems reported by Deborah Goldsmith and 1668 Stephen Colebourne.) 1669 1670 Changes to past timestamps 1671 1672 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 1673 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 1674 1675 Changes to build procedure 1676 1677 The build procedure now works around mawk 1.3.3's lack of support 1678 for character class expressions. (Problem reported by Ohyama.) 1679 1680 1681 Release 2018b - 2018-01-17 23:24:48 -0800 1682 1683 Briefly: 1684 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 1685 1686 Changes to build procedure 1687 1688 The distribution now contains the file 'pacificnew' again. 1689 This file was inadvertently omitted in the 2018a distribution. 1690 (Problem reported by Matias Fonzo.) 1691 1692 1693 Release 2018a - 2018-01-12 22:29:21 -0800 1694 1695 Briefly: 1696 So Tom and Prncipe switched from +00 to +01. 1697 Brazil's DST will now start on November's first Sunday. 1698 Ireland's standard time is now in the summer, not the winter. 1699 Use Debian-style installation locations, instead of 4.3BSD-style. 1700 New zic option -t. 1701 1702 Changes to past and future timestamps 1703 1704 So Tom and Prncipe switched from +00 to +01 on 2018-01-01 at 1705 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 1706 1707 Changes to future timestamps 1708 1709 Starting in 2018 southern Brazil will begin DST on November's 1710 first Sunday instead of October's third Sunday. (Thanks to 1711 Steffen Thorsen.) 1712 1713 Changes to past timestamps 1714 1715 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 1716 been corrected. The 'backzone' and 'zone.tab' files did not agree 1717 with the 'africa' and 'zone1970.tab' files. (Problem reported by 1718 Michael Deckers.) 1719 1720 The abbreviation invented for Bolivia Summer Time (1931-2) is now 1721 BST instead of BOST, to be more consistent with the convention 1722 used for Latvian Summer Time (1918-9) and for British Summer Time. 1723 1724 Changes to tm_isdst 1725 1726 Change Europe/Dublin so that it observes Irish Standard Time (UT 1727 +01) in summer and GMT (as negative daylight-saving) in winter, 1728 instead of observing standard time (GMT) in winter and Irish 1729 Summer Time (UT +01) in summer. This change does not affect UT 1730 offsets or abbreviations; it affects only whether timestamps are 1731 considered to be standard time or daylight-saving time, as 1732 expressed in the tm_isdst flag of C's struct tm type. 1733 (Discrepancy noted by Derick Rethans.) 1734 1735 Changes to build procedure 1736 1737 The default installation locations have been changed to mostly 1738 match Debian circa 2017, instead of being designed as an add-on to 1739 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 1740 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 1741 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 1742 locations more precisely. (This responds to suggestions from 1743 Brian Inglis and from Steve Summit.) 1744 1745 The default installation procedure no longer creates the 1746 backward-compatibility link US/Pacific-New, which causes 1747 confusion during user setup (e.g., see Debian bug 815200). 1748 Use 'make BACKWARD="backward pacificnew"' to create the link 1749 anyway, for now. Eventually we plan to remove the link entirely. 1750 1751 tzdata.zi now contains a version-number comment. 1752 (Suggested by Tom Lane.) 1753 1754 The Makefile now quotes values like BACKWARD more carefully when 1755 passing them to the shell. (Problem reported by Zefram.) 1756 1757 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 1758 that have snprintf and use pre-C99 compilers. (Problem reported 1759 by Jon Skeet.) 1760 1761 Changes to code 1762 1763 zic has a new option -t FILE that specifies the location of the 1764 file that determines local time when TZ is unset. The default for 1765 this location can be configured via the new TZDEFAULT makefile 1766 macro, which defaults to /etc/localtime. 1767 1768 Diagnostics and commentary now distinguish UT from UTC more 1769 carefully; see theory.html for more information about UT vs UTC. 1770 1771 zic has been ported to GCC 8's -Wstringop-truncation option. 1772 (Problem reported by Martin Sebor.) 1773 1774 Changes to documentation and commentary 1775 1776 The zic man page now documents the longstanding behavior that 1777 times and years can be out of the usual range, with negative times 1778 counting backwards from midnight and with year 0 preceding year 1. 1779 (Problem reported by Michael Deckers.) 1780 1781 The theory.html file now mentions the POSIX limit of six chars 1782 per abbreviation, and lists alphabetic abbreviations used. 1783 1784 The files tz-art.htm and tz-link.htm have been renamed to 1785 tz-art.html and tz-link.html, respectively, for consistency with 1786 other file names and to simplify web server configuration. 1787 1788 1789 Release 2017c - 2017-10-20 14:49:34 -0700 1790 1791 Briefly: 1792 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 1793 Fiji ends DST 2018-01-14, not 2018-01-21. 1794 Namibia switches from +01/+02 to +02 on 2018-04-01. 1795 Sudan switches from +03 to +02 on 2017-11-01. 1796 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 1797 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 1798 A new file tzdata.zi now holds a small text copy of all data. 1799 The zic input format has been regularized slightly. 1800 1801 Changes to future timestamps 1802 1803 Northern Cyprus has decided to resume EU rules starting 1804 2017-10-29, thus reinstituting winter time. 1805 1806 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 1807 predicted. (Thanks to Dominic Fok.) Adjust future predictions 1808 accordingly. 1809 1810 Namibia will switch from +01 with DST to +02 all year on 1811 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 1812 at 02:00. (Thanks to Steffen Thorsen.) 1813 1814 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 1815 Atyya and Yahia Abdalla.) South Sudan is not switching, so 1816 Africa/Juba is no longer a link to Africa/Khartoum. 1817 1818 Tonga has likely ended its experiment with DST, and will not 1819 adjust its clocks on 2017-11-05. Although Tonga has not announced 1820 whether it will continue to observe DST, the IATA is assuming that 1821 it will not. (Thanks to David Wade.) 1822 1823 Turks & Caicos will switch from -04 all year to -05 with US DST on 1824 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 1825 at 02:00. (Thanks to Steffen Thorsen.) 1826 1827 Changes to past timestamps 1828 1829 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 1830 (Thanks to Arthur David Olson.) 1831 1832 Detroit did not observe DST in 1967. 1833 1834 Use railway time for Asia/Kolkata before 1941, by switching to 1835 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 1836 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 1837 1838 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 1839 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 1840 1841 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 1842 American time in 1892, not 1879. (Thanks to Michael Deckers.) 1843 1844 Adjust the 1867 transition in Alaska to better reflect the 1845 historical record, by changing it to occur on 1867-10-18 at 15:30 1846 Sitka time rather than at the start of 1867-10-17 local time. 1847 Although strictly speaking this is accurate only for Sitka, 1848 the rest of Alaska's blanks need to be filled in somehow. 1849 1850 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 1851 (Thanks to Michael Deckers.) 1852 1853 Add 7 s to the UT offset in Asia/Yangon before 1920. 1854 1855 Changes to zone names 1856 1857 Remove Canada/East-Saskatchewan from the 'backward' file, as it 1858 exceeded the 14-character limit and was an unused misnomer anyway. 1859 1860 Changes to build procedure 1861 1862 To support applications that prefer to read time zone data in text 1863 form, two zic input files tzdata.zi and leapseconds are now 1864 installed by default. The commands 'zic tzdata.zi' and 'zic -L 1865 leapseconds tzdata.zi' can reproduce the tzdata binary files 1866 without and with leap seconds, respectively. To prevent these two 1867 new files from being installed, use 'make TZDATA_TEXT=', and to 1868 suppress leap seconds from the tzdata text installation, use 'make 1869 TZDATA_TEXT=tzdata.zi'. 1870 1871 'make BACKWARD=' now suppresses backward-compatibility names 1872 like 'US/Pacific' that are defined in the 'backward' and 1873 'pacificnew' files. 1874 1875 'make check' now works on systems that lack a UTF-8 locale, 1876 or that lack the nsgmls program. Set UTF8_LOCALE to configure 1877 the name of a UTF-8 locale, if you have one. 1878 1879 Y2K runtime checks are no longer enabled by default. Add 1880 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 1881 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 1882 to disable them. (New name suggested by Brian Inglis.) 1883 1884 The build procedure for zdump now works on AIX 7.1. 1885 (Problem reported by Kees Dekker.) 1886 1887 Changes to code 1888 1889 zic and the reference runtime now reject multiple leap seconds 1890 within 28 days of each other, or leap seconds before the Epoch. 1891 As a result, support for double leap seconds, which was 1892 obsolescent and undocumented, has been removed. Double leap 1893 seconds were an error in the C89 standard; they have never existed 1894 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 1895 noticing glitches in the code that uncovered this problem.) 1896 1897 zic now warns about use of the obsolescent and undocumented -y 1898 option, and about use of the obsolescent TYPE field of Rule lines. 1899 1900 zic now allows unambiguous abbreviations like "Sa" and "Su" for 1901 weekdays; formerly it rejected them due to a bug. Conversely, zic 1902 no longer considers non-prefixes to be abbreviations; for example, 1903 it no longer accepts "lF" as an abbreviation for "lastFriday". 1904 Also, zic warns about the undocumented usage with a "last-" 1905 prefix, e.g., "last-Fri". 1906 1907 Similarly, zic now accepts the unambiguous abbreviation "L" for 1908 "Link" in ordinary context and for "Leap" in leap-second context. 1909 Conversely, zic no longer accepts non-prefixes such as "La" as 1910 abbreviations for words like "Leap". 1911 1912 zic no longer accepts leap second lines in ordinary input, or 1913 ordinary lines in leap second input. Formerly, zic sometimes 1914 warned about this undocumented usage and handled it incorrectly. 1915 1916 The new macro HAVE_TZNAME governs whether the tzname external 1917 variable is exported, instead of USG_COMPAT. USG_COMPAT now 1918 governs only the external variables "timezone" and "daylight". 1919 This change is needed because the three variables are not in the 1920 same category: although POSIX requires tzname, it specifies the 1921 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 1922 if not defined, the code attempts to guess it from other macros. 1923 1924 localtime.c and difftime.c no longer require stdio.h, and .c files 1925 other than zic.c no longer require sys/wait.h. 1926 1927 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 1928 1929 Calculation of time_t extrema works around a bug in GCC 4.8.4 1930 (Reported by Stan Shebs and Joseph Myers.) 1931 1932 zic.c no longer mistranslates formats of line numbers in non-English 1933 locales. (Problem reported by Benno Schulenberg.) 1934 1935 Several minor changes have been made to the code to make it a 1936 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 1937 Dekker for reporting the problems.) 1938 1939 Changes to documentation and commentary 1940 1941 The two new files 'theory.html' and 'calendars' contain the 1942 contents of the removed file 'Theory'. The goal is to document 1943 tzdb theory more accessibly. 1944 1945 The zic man page now documents abbreviation rules. 1946 1947 tz-link.htm now covers how to apply tzdata changes to clients. 1948 (Thanks to Jorge Fbregas for the AIX link.) It also mentions MySQL. 1949 1950 The leap-seconds.list URL has been updated to something that is 1951 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 1952 1953 Release 2017b - 2017-03-17 07:30:38 -0700 1954 1955 Briefly: Haiti has resumed DST. 1956 1957 Changes to past and future timestamps 1958 1959 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 1960 1961 Changes to past timestamps 1962 1963 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 1964 1965 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 1966 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 1967 1968 Changes to code 1969 1970 The reference localtime implementation now falls back on the 1971 current US daylight-saving transition rules rather than the 1972 1987-2006 rules. This fallback occurs only when (1) the TZ 1973 environment variable has a value like "AST4ADT" that asks 1974 for daylight saving time but does not specify the rules, (2) there 1975 is no file by that name, and (3) the TZDEFRULES file cannot be 1976 loaded. (Thanks to Tom Lane.) 1977 1978 1979 Release 2017a - 2017-02-28 00:05:36 -0800 1980 1981 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 1982 discontinues DST. 1983 1984 Changes to future timestamps 1985 1986 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 1987 1988 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 1989 Its clocks diverge from America/Santiago starting 2017-05-13 at 1990 23:00, hiving off a new zone America/Punta_Arenas. Although the 1991 Chilean government says this change expires in May 2019, for now 1992 assume it's permanent. (Thanks to Juan Correa and Deborah 1993 Goldsmith.) This also affects Antarctica/Palmer. 1994 1995 Changes to past timestamps 1996 1997 Fix many entries for historical timestamps for Europe/Madrid 1998 before 1979, to agree with tables compiled by Pere Planesas of the 1999 National Astronomical Observatory of Spain. As a side effect, 2000 this changes some timestamps for Africa/Ceuta before 1929, which 2001 are probably guesswork anyway. (Thanks to Steve Allen and 2002 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 2003 correcting the 1901 transition.) 2004 2005 Ecuador observed DST from 1992-11-28 to 1993-02-05. 2006 (Thanks to Alois Treindl.) 2007 2008 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 2009 (Thanks to Stepan Golosunov.) 2010 2011 Changes to past and future time zone abbreviations 2012 2013 Switch to numeric time zone abbreviations for South America, as 2014 part of the ongoing project of removing invented abbreviations. 2015 This avoids the need to invent an abbreviation for the new Chilean 2016 new zone. Similarly, switch from invented to numeric time zone 2017 abbreviations for Afghanistan, American Samoa, the Azores, 2018 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 2019 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 2020 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 2021 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 2022 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 2023 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 2024 Papua New Guinea, the Philippines, Pitcairn, Qatar, Runion, St 2025 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 2026 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 2027 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 2028 for half-hour daylight saving time in Belize before 1944 and in 2029 the Dominican Republic before 1975; and for Canary Islands before 2030 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 2031 Indian Summer Time before 1942, for Indonesia before around 1964, 2032 for Kenya before 1960, for Liberia before 1973, for Madeira before 2033 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 2034 Pakistan before 1971, for Western Sahara before 1977, and for 2035 Zaporozhye in 1880-1924. 2036 2037 For Alaska time from 1900 through 1967, instead of "CAT" use the 2038 abbreviation "AST", the abbreviation commonly used at the time 2039 (Atlantic Standard Time had not been standardized yet). Use "AWT" 2040 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 2041 2042 Use "CST" and "CDT" instead of invented abbreviations for Macau 2043 before 1999 and Taiwan before 1938, and use "JST" instead of the 2044 invented abbreviation "JCST" for Japan and Korea before 1938. 2045 2046 Change to database entry category 2047 2048 Move the Pacific/Johnston link from 'australasia' to 'backward', 2049 since Johnston is now uninhabited. 2050 2051 Changes to code 2052 2053 zic no longer mishandles some transitions in January 2038 when it 2054 attempts to work around Qt bug 53071. This fixes a bug affecting 2055 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 2056 now contains a workaround, useful when loading a file generated by 2057 a buggy zic. (Problem and localtime.c fix reported by Bradley 2058 White.) 2059 2060 zdump -i now outputs non-hour numeric time zone abbreviations 2061 without a colon, e.g., "+0530" rather than "+05:30". This agrees 2062 with zic %z and with common practice, and simplifies auditing of 2063 zdump output. 2064 2065 zdump is now buildable again with -DUSE_LTZ=0. 2066 (Problem reported by Joseph Myers.) 2067 2068 zdump.c now always includes private.h, to avoid code duplication 2069 with private.h. (Problem reported by Kees Dekker.) 2070 2071 localtime.c no longer mishandles early or late timestamps 2072 when TZ is set to a POSIX-style string that specifies DST. 2073 (Problem reported by Kees Dekker.) 2074 2075 date and strftime now cause %z to generate "-0000" instead of 2076 "+0000" when the UT offset is zero and the time zone abbreviation 2077 begins with "-". 2078 2079 Changes to documentation and commentary 2080 2081 The 'Theory' file now better documents choice of historical time 2082 zone abbreviations. (Problems reported by Michael Deckers.) 2083 2084 tz-link.htm now covers leap smearing, which is popular in clouds. 2085 2086 2087 Release 2016j - 2016-11-22 23:17:13 -0800 2088 2089 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 2090 2091 Changes to future timestamps 2092 2093 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 2094 This hives off a new zone Europe/Saratov from Europe/Volgograd. 2095 (Thanks to Yuri Konotopov and Stepan Golosunov.) 2096 2097 Changes to past timestamps 2098 2099 The new zone Asia/Atyrau for Atyra Region, Kazakhstan, is like 2100 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 2101 1999, not fall 1994. (Thanks to Stepan Golosunov.) 2102 2103 Changes to past time zone abbreviations 2104 2105 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 2106 summer time before 1948. The old use of "EET" was a typo. 2107 2108 Changes to code 2109 2110 zic no longer mishandles file systems that lack hard links, fixing 2111 bugs introduced in 2016g. (Problems reported by Tom Lane.) 2112 Also, when the destination already contains symbolic links, zic 2113 should now work better on systems where the 'link' system call 2114 does not follow symbolic links. 2115 2116 Changes to documentation and commentary 2117 2118 tz-link.htm now documents the relationship between release version 2119 numbers and development-repository commit tags. (Suggested by 2120 Paul Koning.) 2121 2122 The 'Theory' file now documents UT. 2123 2124 iso3166.tab now accents "Curaao", and commentary now mentions 2125 the names "Cabo Verde" and "Czechia". (Thanks to Ji Boh.) 2126 2127 2128 Release 2016i - 2016-11-01 23:19:52 -0700 2129 2130 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 2131 reintroduces DST on 2016-11-06. 2132 2133 Changes to future timestamps 2134 2135 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 2136 2017-01-15 at 03:00. Assume future observances in Tonga will be 2137 from the first Sunday in November through the third Sunday in 2138 January, like Fiji. (Thanks to Pulu Anau.) Switch to numeric 2139 time zone abbreviations for this zone. 2140 2141 Changes to past and future timestamps 2142 2143 Northern Cyprus is now +03 year round, causing a split in Cyprus 2144 time zones starting 2016-10-30 at 04:00. This creates a zone 2145 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 2146 2147 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 2148 (Thanks to Steffen Thorsen.) 2149 2150 Changes to past timestamps 2151 2152 Several corrections were made for pre-1975 timestamps in Italy. 2153 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 2154 Europe/Vatican. 2155 2156 First, the 1893-11-01 00:00 transition in Italy used the new UT 2157 offset (+01), not the old (+00:49:56). (Thanks to Michael 2158 Deckers.) 2159 2160 Second, rules for daylight saving in Italy were changed to agree 2161 with Italy's National Institute of Metrological Research (INRiM) 2162 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 2163 Inglis, and Michael Deckers): 2164 2165 The 1916-06-03 transition was at 24:00, not 00:00. 2166 2167 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 2168 00:00, not 01:00. 2169 2170 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 2171 01:00. 2172 2173 The 1944-09-17 transition was at 03:00, not 01:00. This 2174 particular change is taken from Italian law as INRiM's table, 2175 (which says 02:00) appears to have a typo here. Also, keep the 2176 1944-04-03 transition for Europe/Rome, as Rome was controlled by 2177 Germany then. 2178 2179 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 2180 not 00:00. 2181 2182 Changes to code 2183 2184 The code should now be buildable on AmigaOS merely by setting the 2185 appropriate Makefile variables. (From a patch by Carsten Larsen.) 2186 2187 2188 Release 2016h - 2016-10-19 23:17:57 -0700 2189 2190 Changes to future timestamps 2191 2192 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 2193 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 2194 future fall transitions will be on the last Saturday of October 2195 at 01:00, which is consistent with predicted spring transitions 2196 on the last Saturday of March. (Thanks to Tim Parenti.) 2197 2198 Changes to past timestamps 2199 2200 In Turkey, transitions in 1986-1990 were at 01:00 standard time 2201 not at 02:00, and the spring 1994 transition was on March 20, not 2202 March 27. (Thanks to Kvan Yazan.) 2203 2204 Changes to past and future time zone abbreviations 2205 2206 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 2207 instead of alphabetic ones like "IST" and "LKT". Various 2208 English-language sources use "IST", "LKT" and "SLST", with no 2209 working consensus. (Usage of "SLST" mentioned by Sadika 2210 Sumanapala.) 2211 2212 Changes to code 2213 2214 zic no longer mishandles relativizing file names when creating 2215 symbolic links like /etc/localtime, when these symbolic links 2216 are outside the usual directory hierarchy. This fixes a bug 2217 introduced in 2016g. (Problem reported by Andreas Stieger.) 2218 2219 Changes to build procedure 2220 2221 New rules 'traditional_tarballs' and 'traditional_signatures' for 2222 building just the traditional-format distribution. (Requested by 2223 Deborah Goldsmith.) 2224 2225 The file 'version' is now put into the tzdata tarball too. 2226 (Requested by Howard Hinnant.) 2227 2228 Changes to documentation and commentary 2229 2230 The 'Theory' file now has a section on interface stability. 2231 (Requested by Paul Koning.) It also mentions features like 2232 tm_zone and localtime_rz that have long been supported by the 2233 reference code. 2234 2235 tz-link.htm has improved coverage of time zone boundaries suitable 2236 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 2237 Johnson.) 2238 2239 The US commentary now mentions Allen and the "day of two noons". 2240 2241 The Fiji commentary mentions the government's 2016-10-03 press 2242 release. (Thanks to Raymond Kumar.) 2243 2244 2245 Release 2016g - 2016-09-13 08:56:38 -0700 2246 2247 Changes to future timestamps 2248 2249 Turkey switched from EET/EEST (+02/+03) to permanent +03, 2250 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 2251 than an invented abbreviation for the new time. 2252 2253 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 2254 (Thanks to Tim Parenti.) 2255 2256 Changes to past timestamps 2257 2258 For America/Los_Angeles, spring-forward transition times have been 2259 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 2260 1950-1966. 2261 2262 For zones using Soviet time on 1919-07-01, transitions to UT-based 2263 time were at 00:00 UT, not at 02:00 local time. The affected 2264 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 2265 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 2266 2267 Changes to past and future time zone abbreviations 2268 2269 The Factory zone now uses the time zone abbreviation -00 instead 2270 of a long English-language string, as -00 is now the normal way to 2271 represent an undefined time zone. 2272 2273 Several zones in Antarctica and the former Soviet Union, along 2274 with zones intended for ships at sea that cannot use POSIX TZ 2275 strings, now use numeric time zone abbreviations instead of 2276 invented or obsolete alphanumeric abbreviations. The affected 2277 zones are Antarctica/Casey, Antarctica/Davis, 2278 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 2279 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 2280 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 2281 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 2282 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 2283 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 2284 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 2285 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 2286 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 2287 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 2288 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 2289 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 2290 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 2291 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 2292 was replaced by +05, whereas MSK and MSD were kept as they are not 2293 our invention and are widely used. 2294 2295 Changes to zone names 2296 2297 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 2298 (Thanks to David Massoud.) 2299 2300 Changes to code 2301 2302 zic no longer generates binary files containing POSIX TZ-like 2303 strings that disagree with the local time type after the last 2304 explicit transition in the data. This fixes a bug with 2305 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 2306 on the reference platform. (Thanks to Alexander Belopolsky for 2307 reporting the bug and suggesting a way forward.) 2308 2309 If the installed localtime and/or posixrules files are symbolic 2310 links, zic now keeps them symbolic links when updating them, for 2311 compatibility with platforms like OpenSUSE where other programs 2312 configure these files as symlinks. 2313 2314 zic now avoids hard linking to symbolic links, avoids some 2315 unnecessary mkdir and stat system calls, and uses shorter file 2316 names internally. 2317 2318 zdump has a new -i option to generate transitions in a 2319 more-compact but still human-readable format. This option is 2320 experimental, and the output format may change in future versions. 2321 (Thanks to Jon Skeet for suggesting that an option was needed, 2322 and thanks to Tim Parenti and Chris Rovick for further comments.) 2323 2324 Changes to build procedure 2325 2326 An experimental distribution format is available, in addition 2327 to the traditional format which will continue to be distributed. 2328 The new format is a tarball tzdb-VERSION.tar.lz with signature 2329 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 2330 tzdb-VERSION containing the code and data of the traditional 2331 two-tarball format, along with extra data that may be useful. 2332 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 2333 for comments about the experimental format.) 2334 2335 The release version number is now more accurate in the usual case 2336 where releases are built from a Git repository. For example, if 2337 23 commits and some working-file changes have been made since 2338 release 2016g, the version number is now something like 2339 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 2340 Tagged releases use the same version number format as before, 2341 e.g., '2016g'. To support the more-accurate version number, its 2342 specification has moved from a line in the Makefile to a new 2343 source file 'version'. 2344 2345 The experimental distribution contains a file to2050.tzs that 2346 contains what should be the output of 'zdump -i -c 2050' on 2347 primary zones. If this file is available, 'make check' now checks 2348 that zdump generates this output. 2349 2350 'make check_web' now works on Fedora-like distributions. 2351 2352 Changes to documentation and commentary 2353 2354 tzfile.5 now documents the new restriction on POSIX TZ-like 2355 strings that is now implemented by zic. 2356 2357 Comments now cite URLs for some 1917-1921 Russian DST decrees. 2358 (Thanks to Alexander Belopolsky.) 2359 2360 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 2361 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 2362 description of Java 8 has been brought up to date (thanks to 2363 Stephen Colebourne). Its description of local time on Mars has 2364 been updated to match current practice, and URLs have been updated 2365 and some obsolete ones removed. 2366 2367 2368 Release 2016f - 2016-07-05 16:26:51 +0200 2369 2370 Changes affecting future timestamps 2371 2372 The Egyptian government changed its mind on short notice, and 2373 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 2374 (Thanks to Mina Samuel.) 2375 2376 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 2377 (Thanks to Stepan Golosunov.) 2378 2379 Changes to past and future timestamps 2380 2381 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 2382 abbreviations instead of invented ones. 2383 2384 Changes affecting past timestamps 2385 2386 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 2387 (Thanks to Stepan Golosunov.) 2388 2389 2390 Release 2016e - 2016-06-14 08:46:16 -0700 2391 2392 Changes affecting future timestamps 2393 2394 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 2395 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 2396 For future years, guess April's last Thursday to October's last 2397 Thursday except for Ramadan. 2398 2399 Changes affecting past timestamps 2400 2401 Locations while uninhabited now use '-00', not 'zzz', as a 2402 placeholder time zone abbreviation. This is inspired by Internet 2403 RFC 3339 and is more consistent with numeric time zone 2404 abbreviations already used elsewhere. The change affects several 2405 arctic and antarctic locations, e.g., America/Cambridge_Bay before 2406 1920 and Antarctica/Troll before 2005. 2407 2408 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 2409 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 2410 2411 Changes to code 2412 2413 zic now outputs a dummy transition at time 2**31 - 1 in zones 2414 whose POSIX-style TZ strings contain a '<'. This mostly works 2415 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 2416 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 2417 2418 Changes affecting documentation and commentary 2419 2420 tz-link.htm says why governments should give plenty of notice for 2421 time zone or DST changes, and refers to Matt Johnson's blog post. 2422 2423 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 2424 2425 2426 Release 2016d - 2016-04-17 22:50:29 -0700 2427 2428 Changes affecting future timestamps 2429 2430 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 2431 (Thanks to Alexander Krivenyshev for the heads-up.) 2432 2433 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 2434 (Thanks to Alexander Krivenyshev and Matt Johnson.) 2435 2436 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 2437 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 2438 at 02:00. (Thanks to Stepan Golosunov.) 2439 2440 Changes affecting past timestamps 2441 2442 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 2443 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 2444 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 2445 the same change. (Thanks to Stepan Golosunov.) 2446 2447 Russia and nearby locations had daylight-saving transitions on 2448 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 2449 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 2450 Golosunov.) 2451 2452 Many corrections to historical time in Kazakhstan from 1991 2453 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 2454 invented time zone abbreviations with numeric abbreviations. 2455 2456 Changes to commentary 2457 2458 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 2459 2460 2461 Release 2016c - 2016-03-23 00:51:27 -0700 2462 2463 Changes affecting future timestamps 2464 2465 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 2466 2467 Chile reverts from permanent to seasonal DST. (Thanks to Juan 2468 Correa for the heads-up, and to Tim Parenti for corrections.) 2469 Guess that future transitions are August's and May's second 2470 Saturdays at 24:00 mainland time. Also, call the period from 2471 2014-09-07 through 2016-05-14 daylight saving time instead of 2472 standard time, as that seems more appropriate now. 2473 2474 Changes affecting past timestamps 2475 2476 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 2477 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 2478 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 2479 (Thanks to Stepan Golosunov.) 2480 2481 Changes to commentary 2482 2483 Several updates and URLs for historical and proposed Russian changes. 2484 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 2485 2486 2487 Release 2016b - 2016-03-12 17:30:14 -0800 2488 2489 Compatibility note 2490 2491 Starting with release 2016b, some data entries cause zic implementations 2492 derived from tz releases 2005j through 2015e to issue warnings like 2493 "time zone abbreviation differs from POSIX standard (+03)". 2494 These warnings should not otherwise affect zic's output and can safely be 2495 ignored on today's platforms, as the warnings refer to a restriction in 2496 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 2497 warnings is to upgrade to zic derived from tz releases 2015f and later. 2498 2499 Changes affecting future timestamps 2500 2501 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 2502 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 2503 2016-03-27 at 02:00 local time. They need distinct zones since their 2504 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 2505 Altai Republic, Russia, which will switch from +06 to +07 on the same date 2506 and local time. The Astrakhan change is already official; the others have 2507 passed the first reading in the State Duma and are extremely likely. 2508 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 2509 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 2510 and Stepan Golosunov for followup.) 2511 2512 As a trial of a new system that needs less information to be made up, 2513 the new zones use numeric time zone abbreviations like "+04" 2514 instead of invented abbreviations like "ASTT". 2515 2516 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 2517 Steffen Thorsen.) 2518 2519 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 2520 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 2521 Saturday at 01:00, not March's last Friday at 24:00. 2522 2523 Changes affecting past timestamps 2524 2525 Europe/Chisinau observed DST during 1990, and switched from +04 to 2526 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 2527 (Thanks to Stepan Golosunov.) 2528 2529 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 2530 KUYT/KUYST. (Thanks to Stepan Golosunov.) 2531 2532 Changes to code 2533 2534 tzselect's diagnostics and checking, and checktab.awk's checking, 2535 have been improved. (Thanks to J William Piggott.) 2536 2537 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 2538 2539 tzselect now tests Julian-date TZ settings more accurately. 2540 (Thanks to J William Piggott.) 2541 2542 Changes to commentary 2543 2544 Comments in zone tables have been improved. (Thanks to J William Piggott.) 2545 2546 tzselect again limits its menu comments so that menus fit on a 2547 2480 alphanumeric display. 2548 2549 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 2550 2551 In the Theory file, the description of possible time zone abbreviations in 2552 tzdata has been cleaned up, as the old description was unclear and 2553 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 2554 2555 2556 Release 2016a - 2016-01-26 23:28:02 -0800 2557 2558 Changes affecting future timestamps 2559 2560 America/Cayman will not observe daylight saving this year after all. 2561 Revert our guess that it would. (Thanks to Matt Johnson.) 2562 2563 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 2564 (Thanks to Alexander Krivenyshev.) 2565 2566 Asia/Tehran now has DST predictions for the year 2038 and later, 2567 to be March 21 00:00 to September 21 00:00. This is likely better 2568 than predicting no DST, albeit off by a day every now and then. 2569 2570 Changes affecting past and future timestamps 2571 2572 America/Metlakatla switched from PST all year to AKST/AKDT on 2573 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 2574 2575 America/Santa_Isabel has been removed, and replaced with a 2576 backward compatibility link to America/Tijuana. Its contents were 2577 apparently based on a misreading of Mexican legislation. 2578 2579 Changes affecting past timestamps 2580 2581 Asia/Karachi's two transition times in 2002 were off by a minute. 2582 (Thanks to Matt Johnson.) 2583 2584 Changes affecting build procedure 2585 2586 An installer can now combine leap seconds with use of the backzone file, 2587 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 2588 The old 'make posix_packrat' rule is now marked as obsolescent. 2589 (Thanks to Ian Abbott for an initial implementation.) 2590 2591 Changes affecting documentation and commentary 2592 2593 A new file LICENSE makes it easier to see that the code and data 2594 are mostly public-domain. (Thanks to James Knight.) The three 2595 non-public-domain files now use the current (3-clause) BSD license 2596 instead of older versions of that license. 2597 2598 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 2599 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 2600 on editing tz source files (with a mention of Sublime zoneinfo, 2601 thanks to Gilmore Davidson). 2602 2603 The Theory and asia files now mention the 2015 book "The Global 2604 Transformation of Time, 1870-1950", and cite a couple of reviews. 2605 2606 The America/Chicago entry now documents the informal use of US 2607 central time in Fort Pierre, South Dakota. (Thanks to Rick 2608 McDermid, Matt Johnson, and Steve Jones.) 2609 2610 2611 Release 2015g - 2015-10-01 00:39:51 -0700 2612 2613 Changes affecting future timestamps 2614 2615 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 2616 (Thanks to Fatih.) 2617 2618 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 2619 (Thanks to Alexander Krivenyshev.) 2620 2621 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 2622 (Thanks to Ken Rylander.) 2623 2624 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 2625 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 2626 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 2627 2628 Changes affecting past timestamps 2629 2630 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 2631 2632 Changes affecting code 2633 2634 localtime no longer mishandles America/Anchorage after 2037. 2635 (Thanks to Bradley White for reporting the bug.) 2636 2637 On hosts with signed 32-bit time_t, localtime no longer mishandles 2638 Pacific/Fiji after 2038-01-16 14:00 UTC. 2639 2640 The localtime module allows the variables 'timezone', 'daylight', 2641 and 'altzone' to be in common storage shared with other modules, 2642 and declares them in case the system <time.h> does not. 2643 (Problems reported by Kees Dekker.) 2644 2645 On platforms with tm_zone, strftime.c now assumes it is not NULL. 2646 This simplifies the code and is consistent with zdump.c. 2647 (Problem reported by Christos Zoulas.) 2648 2649 Changes affecting documentation 2650 2651 The tzfile man page now documents that transition times denote the 2652 starts (not the ends) of the corresponding time periods. 2653 (Ambiguity reported by Bill Seymour.) 2654 2655 2656 Release 2015f - 2015-08-10 18:06:56 -0700 2657 2658 Changes affecting future timestamps 2659 2660 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 2661 The abbreviation remains "KST". (Thanks to Robert Elz.) 2662 2663 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 2664 and Pablo Camargo.) 2665 2666 Changes affecting past and future timestamps 2667 2668 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 2669 (Thanks to Roman Tudos.) 2670 2671 Changes affecting data format and code 2672 2673 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 2674 field of a Rule line should now be '-'; the old values 'even', 2675 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 2676 Although the implementation has not changed, these features do not 2677 work in the default installation, they are not used in the data, 2678 and they are now considered obsolescent. 2679 2680 zic now checks that two rules don't take effect at the same time. 2681 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 2682 simultaneity are now documented. 2683 2684 The two characters '%z' in a zone format now stand for the UT 2685 offset, e.g., '-07' for seven hours behind UT and '+0530' for 2686 five hours and thirty minutes ahead. This better supports time 2687 zone abbreviations conforming to POSIX.1-2001 and later. 2688 2689 Changes affecting installed data files 2690 2691 Comments for America/Halifax and America/Glace_Bay have been improved. 2692 (Thanks to Brian Inglis.) 2693 2694 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 2695 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 2696 installed data files for Europe/Simferopol and Europe/Tallinn. 2697 It does not affect timestamps. (Thanks to Howard Hinnant.) 2698 2699 Changes affecting code 2700 2701 zdump and zic no longer warn about valid time zone abbreviations 2702 like '-05'. 2703 2704 Some Visual Studio 2013 warnings have been suppressed. 2705 (Thanks to Kees Dekker.) 2706 2707 'date' no longer sets the time of day and its -a, -d, -n and -t 2708 options have been removed. Long obsolescent, the implementation 2709 of these features had porting problems. Builders no longer need 2710 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 2711 (Thanks to Kees Dekker for pointing out the problem.) 2712 2713 Changes affecting documentation 2714 2715 The Theory file mentions naming issues earlier, as these seem to be 2716 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 2717 2718 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 2719 2720 Mention that Herbert Samuel introduced the term "Summer Time". 2721 2722 2723 Release 2015e - 2015-06-13 10:56:02 -0700 2724 2725 Changes affecting future timestamps 2726 2727 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 2728 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 2729 2730 Assume Cayman Islands will observe DST starting next year, using US rules. 2731 Although it isn't guaranteed, it is the most likely. 2732 2733 Changes affecting data format 2734 2735 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 2736 spell the names of land Islands, Cte d'Ivoire, and Runion. 2737 2738 Changes affecting code 2739 2740 When displaying data, tzselect converts it to the current locale's 2741 encoding if the iconv command works. (Problem reported by random832.) 2742 2743 tzselect no longer mishandles Dominica, fixing a bug introduced 2744 in Release 2014f. (Problem reported by Owen Leibman.) 2745 2746 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 2747 This fixes a bug introduced in Release 2014f. 2748 (Problem reported by Leonardo Chiquitto.) 2749 2750 2751 Release 2015d - 2015-04-24 08:09:46 -0700 2752 2753 Changes affecting future timestamps 2754 2755 Egypt will not observe DST in 2015 and will consider canceling it 2756 permanently. For now, assume no DST indefinitely. 2757 (Thanks to Ahmed Nazmy and Tim Parenti.) 2758 2759 Changes affecting past timestamps 2760 2761 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 2762 1966-07-01. Also, Yukon's time zone history is documented better. 2763 (Thanks to Brian Inglis and Dennis Ferguson.) 2764 2765 Change affecting past and future time zone abbreviations 2766 2767 The abbreviations for Hawaii-Aleutian standard and daylight times 2768 have been changed from HAST/HADT to HST/HDT, as per US Government 2769 Printing Office style. This affects only America/Adak since 1983, 2770 as America/Honolulu was already using the new style. 2771 2772 Changes affecting code 2773 2774 zic has some minor performance improvements. 2775 2776 2777 Release 2015c - 2015-04-11 08:55:55 -0700 2778 2779 Changes affecting future timestamps 2780 2781 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 2782 not 00:00 on April's last Friday. 2015's transition will therefore be on 2783 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 2784 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 2785 2786 Changes affecting past timestamps 2787 2788 The following changes affect some pre-1991 Chile-related timestamps 2789 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 2790 2791 The 1910 transition was January 10, not January 1. 2792 2793 The 1918 transition was September 10, not September 1. 2794 2795 The UT -04 time observed from 1932 to 1942 is now considered to 2796 be standard time, not year-round DST. 2797 2798 Santiago observed DST (UT -03) from 1946-07-15 through 2799 1946-08-31, then reverted to standard time, then switched to -05 2800 on 1947-04-01. 2801 2802 Assume transitions before 1968 were at 00:00, since we have no data 2803 saying otherwise. 2804 2805 The spring 1988 transition was 1988-10-09, not 1988-10-02. 2806 The fall 1990 transition was 1990-03-11, not 1990-03-18. 2807 2808 Assume no UT offset change for Pacific/Easter on 1890-01-01, 2809 and omit all transitions on Pacific/Easter from 1942 through 1946 2810 since we have no data suggesting that they existed. 2811 2812 One more zone has been turned into a link, as it differed 2813 from an existing zone only for older timestamps. As usual, 2814 this change affects UT offsets in pre-1970 timestamps only. 2815 The zone's old contents have been moved to the 'backzone' file. 2816 The affected zone is America/Montreal. 2817 2818 Changes affecting commentary 2819 2820 Mention the TZUpdater tool. 2821 2822 Mention "The Time Now". (Thanks to Brandon Ramsey.) 2823 2824 2825 Release 2015b - 2015-03-19 23:28:11 -0700 2826 2827 Changes affecting future timestamps 2828 2829 Mongolia will start observing DST again this year, from the last 2830 Saturday in March at 02:00 to the last Saturday in September at 00:00. 2831 (Thanks to Ganbold Tsagaankhuu.) 2832 2833 Palestine will start DST on March 28, not March 27. Also, 2834 correct the fall 2014 transition from September 26 to October 24. 2835 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 2836 2837 Changes affecting past timestamps 2838 2839 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 2840 regression. (Thanks to Stuart Bishop for reporting the problem.) 2841 2842 Some more zones have been turned into links, when they differed 2843 from existing zones only for older timestamps. As usual, 2844 these changes affect UT offsets in pre-1970 timestamps only. 2845 Their old contents have been moved to the 'backzone' file. 2846 The affected zones are: America/Antigua, America/Cayman, 2847 Pacific/Midway, and Pacific/Saipan. 2848 2849 Changes affecting time zone abbreviations 2850 2851 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 2852 (Thanks to Hank W.) 2853 2854 Changes affecting code 2855 2856 Fix integer overflow bug in reference 'mktime' implementation. 2857 (Problem reported by Jrg Richter.) 2858 2859 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 2860 to be used in the same executable as standard-library time_t functions. 2861 (Problems reported by Bradley White.) 2862 2863 Changes affecting commentary 2864 2865 Cite the recent Mexican decree changing Quintana Roo's time zone. 2866 (Thanks to Carlos Ral Perasso.) 2867 2868 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 2869 2870 Update info about Mars time. 2871 2872 2873 Release 2015a - 2015-01-29 22:35:20 -0800 2874 2875 Changes affecting future timestamps 2876 2877 The Mexican state of Quintana Roo, represented by America/Cancun, 2878 will shift from Central Time with DST to Eastern Time without DST 2879 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 2880 2881 Chile will not change clocks in April or thereafter; its new standard time 2882 will be its old daylight saving time. This affects America/Santiago, 2883 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 2884 2885 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 2886 (Thanks to Tim Parenti.) 2887 2888 Changes affecting past timestamps 2889 2890 Iceland observed DST in 1919 and 1921, and its 1939 fallback 2891 transition was Oct. 29, not Nov. 29. Remove incorrect data from 2892 Shanks about time in Iceland between 1837 and 1908. 2893 2894 Some more zones have been turned into links, when they differed 2895 from existing zones only for older timestamps. As usual, 2896 these changes affect UT offsets in pre-1970 timestamps only. 2897 Their old contents have been moved to the 'backzone' file. 2898 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 2899 and Asia/Muscat. 2900 2901 Changes affecting code 2902 2903 tzalloc now scrubs time zone abbreviations compatibly with the way 2904 that tzset always has, by replacing invalid bytes with '_' and by 2905 shortening too-long abbreviations. 2906 2907 tzselect ports to POSIX awk implementations, no longer mishandles 2908 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 2909 settings to the user. (Thanks to Stefan Kuhn.) 2910 2911 Changes affecting build procedure 2912 2913 'make check' now checks for links to links in the data. 2914 One such link (for Africa/Asmera) has been fixed. 2915 (Thanks to Stephen Colebourne for pointing out the problem.) 2916 2917 Changes affecting commentary 2918 2919 The leapseconds file commentary now mentions the expiration date. 2920 (Problem reported by Martin Burnicki.) 2921 2922 Update Mexican Library of Congress URL. 2923 2924 2925 Release 2014j - 2014-11-10 17:37:11 -0800 2926 2927 Changes affecting current and future timestamps 2928 2929 Turks & Caicos' switch from US eastern time to UT -04 year-round 2930 did not occur on 2014-11-02 at 02:00. It's currently scheduled 2931 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 2932 2933 Changes affecting past timestamps 2934 2935 Many pre-1989 timestamps have been corrected for Asia/Seoul and 2936 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 2937 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 2938 longer guess that Pyongyang mimicked Seoul time after World War II, 2939 as this is politically implausible. 2940 2941 Some more zones have been turned into links, when they differed 2942 from existing zones only for older timestamps. As usual, 2943 these changes affect UT offsets in pre-1970 timestamps only. 2944 Their old contents have been moved to the 'backzone' file. 2945 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 2946 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 2947 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 2948 Indian/Mayotte. 2949 2950 Changes affecting commentary 2951 2952 The commentary is less enthusiastic about Shanks as a source, 2953 and is more careful to distinguish UT from UTC. 2954 2955 2956 Release 2014i - 2014-10-21 22:04:57 -0700 2957 2958 Changes affecting future timestamps 2959 2960 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 2961 (Thanks to Ken Rylander for the heads-up.) Guess that future 2962 years will use a similar pattern. 2963 2964 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 2965 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 2966 (Thanks to Kiley Walbom for the heads-up.) 2967 2968 Changes affecting time zone abbreviations 2969 2970 Since Belarus is not changing its clocks even though Moscow is, 2971 the time zone abbreviation in Europe/Minsk is changing from FET 2972 to its more-traditional value MSK on 2014-10-26 at 01:00. 2973 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 2974 2975 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 2976 Indochina, to distinguish it better from ICT (+07). 2977 2978 Changes affecting past timestamps 2979 2980 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 2981 (thanks to Trn Ngc Qun for an indirect pointer to Trn Tin Bnh's 2982 authoritative book). Asia/Ho_Chi_Minh has been added to 2983 zone1970.tab, to give tzselect users in Vietnam two choices, 2984 since north and south Vietnam disagreed after our 1970 cutoff. 2985 2986 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 2987 they differed from existing zones only for older timestamps. As 2988 usual, these changes affect pre-1970 timestamps only. Their old 2989 contents have been moved to the 'backzone' file. 2990 2991 Changes affecting code 2992 2993 The time-related library functions now set errno on failure, and 2994 some crashes in the new tzalloc-related library functions have 2995 been fixed. (Thanks to Christos Zoulas for reporting most of 2996 these problems and for suggesting fixes.) 2997 2998 If USG_COMPAT is defined and the requested timestamp is standard time, 2999 the tz library's localtime and mktime functions now set the extern 3000 variable timezone to a value appropriate for that timestamp; and 3001 similarly for ALTZONE, daylight saving time, and the altzone variable. 3002 This change is a companion to the tzname change in 2014h, and is 3003 designed to make timezone and altzone more compatible with tzname. 3004 3005 The tz library's functions now set errno to EOVERFLOW if they fail 3006 because the result cannot be represented. ctime and ctime_r now 3007 return NULL and set errno when a timestamp is out of range, rather 3008 than having undefined behavior. 3009 3010 Some bugs associated with the new 2014g functions have been fixed. 3011 This includes a bug that largely incapacitated the new functions 3012 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 3013 It also includes some uses of uninitialized variables after tzalloc. 3014 The new code uses the standard type 'ssize_t', which the Makefile 3015 now gives porting advice about. 3016 3017 Changes affecting commentary 3018 3019 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 3020 3021 3022 Release 2014h - 2014-09-25 18:59:03 -0700 3023 3024 Changes affecting past timestamps 3025 3026 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 3027 3028 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 3029 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 3030 3031 Some more zones have been turned into links, when they differed 3032 from existing zones only for older timestamps. As usual, 3033 these changes affect UT offsets in pre-1970 timestamps only. 3034 Their old contents have been moved to the 'backzone' file. 3035 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 3036 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 3037 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 3038 3039 Changes affecting code 3040 3041 zdump -V and -v now output gmtoff= values on all platforms, 3042 not merely on platforms defining TM_GMTOFF. 3043 3044 The tz library's localtime and mktime functions now set tzname to a value 3045 appropriate for the requested timestamp, and zdump now uses this 3046 on platforms not defining TM_ZONE, fixing a 2014g regression. 3047 (Thanks to Tim Parenti for reporting the problem.) 3048 3049 The tz library no longer sets tzname if localtime or mktime fails. 3050 3051 zdump -c no longer mishandles transitions near year boundaries. 3052 (Thanks to Tim Parenti for reporting the problem.) 3053 3054 An access to uninitialized data has been fixed. 3055 (Thanks to Jrg Richter for reporting the problem.) 3056 3057 When THREAD_SAFE is defined, the code ports to the C11 memory model. 3058 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 3059 and two threads race to initialize data used by gmtime-like functions. 3060 (Thanks to Andy Heninger for reporting the problems.) 3061 3062 Changes affecting build procedure 3063 3064 'make check' now checks better for properly-sorted data. 3065 3066 Changes affecting documentation and commentary 3067 3068 zdump's gmtoff=N output is now documented, and its isdst=D output 3069 is now documented to possibly output D values other than 0 or 1. 3070 3071 zdump -c's treatment of years is now documented to use the 3072 Gregorian calendar and Universal Time without leap seconds, 3073 and its behavior at cutoff boundaries is now documented better. 3074 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 3075 3076 Programs are now documented to use the proleptic Gregorian calendar. 3077 (Thanks to Alan Barrett for the suggestion.) 3078 3079 Fractional-second GMT offsets have been documented for civil time 3080 in 19th-century Chennai, Jakarta, and New York. 3081 3082 3083 Release 2014g - 2014-08-28 12:31:23 -0700 3084 3085 Changes affecting future timestamps 3086 3087 Turks & Caicos is switching from US eastern time to UT -04 3088 year-round, modeled as a switch on 2014-11-02 at 02:00. 3089 [As noted in 2014j, this switch was later delayed.] 3090 3091 Changes affecting past timestamps 3092 3093 Time in Russia or the USSR before 1926 or so has been corrected by 3094 a few seconds in the following zones: Asia/Irkutsk, 3095 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 3096 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 3097 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 3098 Vladimir Karpinsky.) 3099 3100 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 3101 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 3102 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 3103 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 3104 (Thanks to Stephen Colebourne for pointing to the decree.) 3105 3106 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 3107 3108 A new file 'backzone' contains data which may appeal to 3109 connoisseurs of old timestamps, although it is out of scope for 3110 the tz database, is often poorly sourced, and contains some data 3111 that is known to be incorrect. The new file is not recommended 3112 for ordinary use and its entries are not installed by default. 3113 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 3114 Isle of Man entries.) 3115 3116 Some more zones have been turned into links, when they differed 3117 from existing zones only for older timestamps. As usual, 3118 these changes affect UT offsets in pre-1970 timestamps only. 3119 Their old contents have been moved to the 'backzone' file. 3120 The affected zones are: Africa/Bangui, Africa/Brazzaville, 3121 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 3122 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 3123 3124 Changes affecting code 3125 3126 Unless NETBSD_INSPIRED is defined to 0, the tz library now 3127 supplies functions for creating and using objects that represent 3128 timezones. The new functions are tzalloc, tzfree, localtime_rz, 3129 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 3130 time2posix_z. They are intended for performance: for example, 3131 localtime_rz (unlike localtime_r) is trivially thread-safe without 3132 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 3133 functions, and to Alan Barrett and Jonathan Lennox for helping to 3134 debug the change.) 3135 3136 zdump now builds with the tz library unless USE_LTZ is defined to 0, 3137 This lets zdump use tz features even if the system library lacks them. 3138 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 3139 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 3140 3141 zdump now uses localtime_rz if available, as it's significantly faster, 3142 and it can help zdump better diagnose invalid timezone names. 3143 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 3144 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 3145 not available, zdump now uses localtime_r and tzset if available, 3146 as this is a bit cleaner and faster than plain localtime. Compile 3147 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 3148 lacks these two functions. 3149 3150 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 3151 Although not needed for tz's own applications, which are single-threaded, 3152 this supports POSIX better if the tz library is used in multithreaded apps. 3153 3154 Some crashes have been fixed when zdump or the tz library is given 3155 invalid or outlandish input. 3156 3157 The tz library no longer mishandles leap seconds on platforms with 3158 unsigned time_t in timezones that lack ordinary transitions after 1970. 3159 3160 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 3161 already defined, to make it easier to configure on common platforms. 3162 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 3163 3164 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 3165 assumes that reading uninitialized memory yields garbage values 3166 but does not cause other problems such as traps. 3167 3168 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 3169 more likely to guess right for ambiguous timestamps near 3170 transitions where tm_isdst does not change. 3171 3172 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 3173 strftime_l for compatibility with recent versions of POSIX. 3174 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 3175 to 1 on recent POSIX versions, and to 0 otherwise. 3176 3177 tzselect -c now uses a hybrid distance measure that works better 3178 in Africa. (Thanks to Alan Barrett for noting the problem.) 3179 3180 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 3181 or when time_tz is defined. 3182 3183 When HAVE_UTMPX_H is set the 'date' command now builds on systems 3184 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 3185 the date it updates the wtmpx file if _PATH_WTMPX is defined. 3186 This affects GNU/Linux and similar systems. 3187 3188 For easier maintenance later, some C code has been simplified, 3189 some lint has been removed, and the code has been tweaked so that 3190 plain 'make' is more likely to work. 3191 3192 The C type 'bool' is now used for boolean values, instead of 'int'. 3193 3194 The long-obsolete LOCALE_HOME code has been removed. 3195 3196 The long-obsolete 'gtime' function has been removed. 3197 3198 Changes affecting build procedure 3199 3200 'zdump' no longer links in ialloc.o, as it's not needed. 3201 3202 'make check_time_t_alternatives' no longer assumes GNU diff. 3203 3204 Changes affecting distribution tarballs 3205 3206 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 3207 the tzdata tarball instead of the tzcode tarball, since they help 3208 maintain the data. The NEWS and Theory files are now also 3209 distributed in the tzdata tarball, as they're relevant for data. 3210 (Thanks to Alan Barrett for pointing this out.) Also, the 3211 leapseconds.awk file is no longer distributed in the tzcode 3212 tarball, since it belongs in the tzdata tarball (where 2014f 3213 inadvertently also distributed it). 3214 3215 Changes affecting documentation and commentary 3216 3217 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 3218 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 3219 for debugging it.) 3220 3221 The man pages have been updated to use function prototypes, 3222 to document thread-safe variants like localtime_r, and to document 3223 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 3224 mktime_z. 3225 3226 The fields in Link lines have been renamed to be more descriptive 3227 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 3228 and LINK-TO has become LINK-NAME. 3229 3230 tz-link.htm mentions the IETF's tzdist working group; Windows 3231 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 3232 3233 Some broken URLs have been fixed in the commentary. (Thanks to 3234 Lester Caine.) 3235 3236 Commentary about Philippines DST has been updated, and commentary 3237 on pre-1970 time in India has been added. 3238 3239 3240 Release 2014f - 2014-08-05 17:42:36 -0700 3241 3242 Changes affecting future timestamps 3243 3244 Russia will subtract an hour from most of its time zones on 2014-10-26 3245 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 3246 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 3247 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 3248 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 3249 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 3250 (Europe/Samara) are not changing their clocks. The changed zones are 3251 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 3252 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 3253 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 3254 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 3255 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 3256 but not its UTC offset. Two zones are added: Asia/Chita (split 3257 from Asia/Yakutsk, and also with two hours subtracted) and 3258 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 3259 subtracted). (Thanks to Tim Parenti for much of the above.) 3260 3261 Changes affecting time zone abbreviations 3262 3263 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 3264 and similarly for the other Australian zones. That is, for eastern 3265 standard and daylight saving time the abbreviations are AEST and AEDT 3266 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 3267 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 3268 This change does not affect UT offsets, only time zone abbreviations. 3269 (Thanks to Rich Tibbett and many others.) 3270 3271 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 3272 effective 2014-10-26 at 02:00 local time. 3273 3274 The time zone abbreviation for Xinjiang Time (observed in rmqi) 3275 has been changed from URUT to XJT. (Thanks to Luther Ma.) 3276 3277 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 3278 Similarly, prefer EET/EEST for eastern European time in Russia. 3279 3280 Change time zone abbreviations in (western) Samoa to use "ST" and 3281 "DT" suffixes, as this is more likely to match common practice. 3282 Prefix "W" to (western) Samoa time when its standard-time offset 3283 disagrees with that of American Samoa. 3284 3285 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 3286 3287 Time zone abbreviations have been updated for Japan's two time 3288 zones used 1896-1937. JWST now stands for Western Standard 3289 Time, and JCST for Central Standard Time (formerly this was CJT). 3290 These abbreviations are now used for time in Korea, Taiwan, 3291 and Sakhalin while controlled by Japan. 3292 3293 Changes affecting past timestamps 3294 3295 China's five zones have been simplified to two, since the post-1970 3296 differences in the other three seem to have been imaginary. The 3297 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 3298 removed; backwards-compatibility links still work, albeit with 3299 different behaviors for timestamps before May 1980. Asia/Urumqi's 3300 1980 transition to UT +08 has been removed, so that it is now at 3301 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 3302 Treindl sent helpful translations of two papers by Guo Qingsheng.) 3303 3304 Some zones have been turned into links, when they differed from existing 3305 zones only for older UT offsets where data entries were likely invented. 3306 These changes affect UT offsets in pre-1970 timestamps only. This is 3307 similar to the change in release 2013e, except this time for western 3308 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 3309 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 3310 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 3311 Atlantic/St_Helena. This also affects the backwards-compatibility 3312 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 3313 Tim Parenti, and David Patte for reporting problems in earlier 3314 versions of this change.) 3315 3316 Asia/Shanghai's pre-standard-time UT offset has been changed from 3317 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 3318 transition to standard time has been changed from 1928 to 1901. 3319 3320 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 3321 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 3322 In 1946 it observed DST from 05-15 through 09-30; in 1947 3323 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 3324 (Thanks to Yu-Cheng Chuang.) 3325 3326 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 3327 3328 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 3329 10-03 at 00:00. (Thanks to Konstantin Hyppnen.) 3330 3331 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 3332 period from 1911 to 1950. 3333 3334 Pacific/Chatham has been changed to New Zealand standard time plus 3335 45 minutes for the period before 1957, reflecting a 1956 remark in 3336 the New Zealand parliament. 3337 3338 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 3339 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 3340 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 3341 not 04-06 at 02:00; and there was no DST in 1920. 3342 3343 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 3344 3345 Time in Russia before 1927 or so has been corrected by a few seconds in 3346 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 3347 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 3348 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 3349 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 3350 3351 Changes affecting data format 3352 3353 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 3354 The new file's extended format allows multiple country codes per zone. 3355 The older file is still installed but is deprecated; its format is 3356 not changing and it will still be distributed for a while, but new 3357 applications should use the new file. 3358 3359 The new file format simplifies maintenance of obscure locations. 3360 To test this, it adds coverage for the Crozet Islands and the 3361 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 3362 3363 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 3364 It is still ASCII now, but commentary about the switch has been added. 3365 The new file 'zone1970.tab' already uses UTF-8. 3366 3367 Changes affecting code 3368 3369 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 3370 is defined. (Thanks to Elliott Hughes for reporting the problem.) 3371 3372 'zic' no longer mishandles input when ignoring case in locales that 3373 are not compatible with English, e.g., unibyte Turkish locales when 3374 compiled with HAVE_GETTEXT. 3375 3376 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 3377 they no longer use ASCII '-' as if it were a dash. 3378 3379 'zic' now rejects output file names that contain '.' or '..' components. 3380 (Thanks to Tim Parenti for reporting the problem.) 3381 3382 'zic -v' now warns about output file names that do not follow 3383 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 3384 David Olson for starting the ball rolling on this.) 3385 3386 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 3387 3388 Changes affecting build procedure 3389 3390 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 3391 (Thanks to John Cochran.) 3392 3393 Changes affecting documentation and commentary 3394 3395 The 'Theory' file documents legacy names, the longstanding 3396 exceptions to the POSIX-inspired file name rules. 3397 3398 The 'zic' documentation clarifies the role of time types when 3399 interpreting dates. (Thanks to Arthur David Olson.) 3400 3401 Documentation and commentary now prefer UTF-8 to US-ASCII, 3402 allowing the use of proper accents in foreign words and names. 3403 Code and data have not changed because of this. (Thanks to 3404 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 3405 this.) 3406 3407 Non-HTML documentation and commentary now use plain-text URLs instead of 3408 HTML insertions, and are more consistent about bracketing URLs when they 3409 are not already surrounded by white space. (Thanks to suggestions by 3410 Steffen Nurpmeso.) 3411 3412 There is new commentary about Xujiahui Observatory, the five time-zone 3413 project in China from 1918 to 1949, timekeeping in Japanese-occupied 3414 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 3415 warlord Jin Shuren in the data. 3416 3417 Commentary about the coverage of each Russian zone has been standardized. 3418 (Thanks to Tim Parenti.) 3419 3420 There is new commentary about contemporary timekeeping in Ethiopia. 3421 3422 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 3423 3424 There is new commentary about time in Poland in 1919. 3425 3426 Proper credit has been given to DST inventor George Vernon Hudson. 3427 3428 Commentary about time in Metlakatla, AK and Resolute, NU has been 3429 improved, with a new source for the former. 3430 3431 In zone.tab, Pacific/Easter no longer mentions Salas y Gmez, as it 3432 is uninhabited. 3433 3434 Commentary about permanent Antarctic bases has been updated. 3435 3436 Several typos have been corrected. (Thanks to Tim Parenti for 3437 contributing some of these fixes.) 3438 3439 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 3440 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 3441 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 3442 (Thanks to a heads-up from Dirkjan Ochtman.) 3443 3444 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 3445 have been removed. These obsolescent US Naval Observatory entries were no 3446 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 3447 3448 3449 Release 2014e - 2014-06-12 21:53:52 -0700 3450 3451 Changes affecting near-future timestamps 3452 3453 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 3454 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 3455 switch to standard time at 24:00 the last Thursday before Ramadan, and 3456 back to DST at 00:00 the first Friday after Ramadan. 3457 3458 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 3459 to Milamber Space Network.) Guess that from 2015 on Morocco will 3460 temporarily switch to standard time at 03:00 the last Saturday before 3461 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 3462 3463 Changes affecting past timestamps 3464 3465 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 3466 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 3467 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 3468 in 1991. (Thanks to Hank W. for reporting the problems.) 3469 3470 Changes affecting commentary 3471 3472 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 3473 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 3474 removes stale pointers to World Time Explorer and WORLDTIME. 3475 3476 3477 Release 2014d - 2014-05-27 21:34:40 -0700 3478 3479 Changes affecting code 3480 3481 zic no longer generates files containing timestamps before the Big Bang. 3482 This works around GNOME glib bug 878 3483 <https://gitlab.gnome.org/GNOME/glib/issues/878> 3484 (Thanks to Leonardo Chiquitto for reporting the bug, and to 3485 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 3486 3487 Changes affecting documentation 3488 3489 tz-link.htm now mentions GNOME. 3490 3491 3492 Release 2014c - 2014-05-13 07:44:13 -0700 3493 3494 Changes affecting near-future timestamps 3495 3496 Egypt observes DST starting 2014-05-15 at 24:00. 3497 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 3498 Details have not been announced, except that DST will not be observed 3499 during Ramadan. Guess that DST will stop during the same Ramadan dates as 3500 Morocco, and that Egypt's future spring and fall transitions will be the 3501 same as 2010 when it last observed DST, namely April's last Friday at 3502 00:00 to September's last Thursday at 23:00 standard time. Also, guess 3503 that Ramadan transitions will be at 00:00 standard time. 3504 3505 Changes affecting code 3506 3507 zic now generates transitions for minimum time values, eliminating guesswork 3508 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 3509 3510 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 3511 3512 Changes affecting commentary and documentation 3513 3514 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 3515 3516 3517 Release 2014b - 2014-03-24 21:28:50 -0700 3518 3519 Changes affecting near-future timestamps 3520 3521 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 3522 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 3523 3524 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 3525 Bengt-Inge Larsson.) This is currently an approximation; a better version 3526 will require the zic and localtime fixes mentioned below, and the plan is 3527 to wait for a while until at least the zic fixes propagate. 3528 3529 Changes affecting code 3530 3531 'zic' and 'localtime' no longer reject locations needing four transitions 3532 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 3533 Also, 'zic' avoids some unlikely failures due to integer overflow. 3534 3535 Changes affecting build procedure 3536 3537 'make check' now detects Rule lines defined but never used. 3538 The NZAQ rules, an instance of this problem, have been removed. 3539 3540 Changes affecting commentary and documentation 3541 3542 Fix Tuesday/Thursday typo in description of time in Israel. 3543 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 3544 3545 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 3546 to Donald MacQueen.) Instead, the Microsoft Windows Store app 3547 library supports them. 3548 3549 Add comments about Johnston Island time in the 1960s. 3550 (Thanks to Lyle McElhaney.) 3551 3552 Morocco's 2014 DST start will be as predicted. 3553 (Thanks to Sebastien Willemijns.) 3554 3555 3556 Release 2014a - 2014-03-07 23:30:29 -0800 3557 3558 Changes affecting near-future timestamps 3559 3560 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 3561 the heads-up, and to Tim Parenti for simplifying the update.) 3562 3563 Changes affecting past timestamps 3564 3565 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00. 3566 (Thanks to Steffen Thorsen.) 3567 3568 Ukraine switched from Moscow to Eastern European time on 1990-07-01 3569 (not 1992-01-01), and observed DST during the entire next winter. 3570 (Thanks to Vladimir in Moscow via Alois Treindl.) 3571 3572 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 3573 (Thanks to Avigdor Finkelstein.) 3574 3575 Changes affecting code 3576 3577 A uninitialized-storage bug in 'localtime' has been fixed. 3578 (Thanks to Logan Chien.) 3579 3580 Changes affecting the build procedure 3581 3582 The settings for 'make check_web' now default to Ubuntu 13.10. 3583 3584 Changes affecting commentary and documentation 3585 3586 The boundary of the US Pacific time zone is given more accurately. 3587 (Thanks to Alan Mintz.) 3588 3589 Chile's 2014 DST will be as predicted. (Thanks to Jos Miguel Garrido.) 3590 3591 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Ral Perasso.) 3592 3593 Better descriptions of countries with same time zone history as 3594 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 3595 3596 Several changes affect tz-link.htm, the main web page. 3597 3598 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 3599 David Braverman). 3600 3601 Mention xCal (Internet RFC 6321) and jCal. 3602 3603 Microsoft has some support for tz database names. 3604 3605 CLDR data formats include both XML and JSON. 3606 3607 Mention Maggiolo's map of solar vs standard time. 3608 (Thanks to Arthur David Olson.) 3609 3610 Mention TZ4Net. (Thanks to Matt Johnson.) 3611 3612 Mention the timezone-olson Haskell package. 3613 3614 Mention zeitverschiebung.net. (Thanks to Martin Jger.) 3615 3616 Remove moribund links to daylight-savings-time.info and to 3617 Simple Timer + Clocks. 3618 3619 Update two links. (Thanks to Oscar van Vlijmen.) 3620 3621 Fix some formatting glitches, e.g., remove random newlines from 3622 abbr elements' title attributes. 3623 3624 3625 Release 2013i - 2013-12-17 07:25:23 -0800 3626 3627 Changes affecting near-future timestamps: 3628 3629 Jordan switches back to standard time at 00:00 on December 20, 2013. 3630 The 2006-2011 transition schedule is planned to resume in 2014. 3631 (Thanks to Steffen Thorsen.) 3632 3633 Changes affecting past timestamps: 3634 3635 In 2004, Cuba began DST on March 28, not April 4. 3636 (Thanks to Steffen Thorsen.) 3637 3638 Changes affecting code 3639 3640 The compile-time flag NOSOLAR has been removed, as nowadays the 3641 benefit of slightly shrinking runtime table size is outweighed by the 3642 cost of disallowing potential future updates that exceed old limits. 3643 3644 Changes affecting documentation and commentary 3645 3646 The files solar87, solar88, and solar89 are no longer distributed. 3647 They were a negative experiment - that is, a demonstration that 3648 tz data can represent solar time only with some difficulty and error. 3649 Their presence in the distribution caused confusion, as Riyadh 3650 civil time was generally not solar time in those years. 3651 3652 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 3653 3654 3655 Release 2013h - 2013-10-25 15:32:32 -0700 3656 3657 Changes affecting current and future timestamps: 3658 3659 Libya has switched its UT offset back to +02 without DST, instead 3660 of +01 with DST. (Thanks to Even Scharning.) 3661 3662 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 3663 (Thanks to Gwillim Law.) 3664 3665 Changes affecting future timestamps: 3666 3667 Acre and (we guess) western Amazonas will switch from UT -04 to -05 3668 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 3669 (Thanks to Steffen Thorsen.) 3670 3671 Add entries for DST transitions in Morocco in the year 2038. 3672 This avoids some year-2038 glitches introduced in 2013g. 3673 (Thanks to Yoshito Umaoka for reporting the problem.) 3674 3675 Changes affecting API 3676 3677 The 'tzselect' command no longer requires the 'select' command, 3678 and should now work with /bin/sh on more platforms. It also works 3679 around a bug in BusyBox awk before version 1.21.0. (Thanks to 3680 Patrick 'P. J.' McDermott and Alan Barrett.) 3681 3682 Changes affecting code 3683 3684 Fix localtime overflow bugs with 32-bit unsigned time_t. 3685 3686 zdump no longer assumes sscanf returns maximal values on overflow. 3687 3688 Changes affecting the build procedure 3689 3690 The builder can specify which programs to use, if any, instead of 3691 'ar' and 'ranlib', and libtz.a is now built locally before being 3692 installed. (Thanks to Michael Forney.) 3693 3694 A dependency typo in the 'zdump' rule has been fixed. 3695 (Thanks to Andrew Paprocki.) 3696 3697 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 3698 work as specified by POSIX.2-1992 or later; this is portable nowadays. 3699 3700 'make clean' no longer removes 'leapseconds', since it's 3701 host-independent and is part of the distribution. 3702 3703 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 3704 3705 Changes affecting documentation and commentary 3706 3707 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 3708 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 3709 3710 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 3711 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 3712 longer maintained) and for old advisories. SOFA now does C. 3713 3714 Release 2013g - 2013-09-30 21:08:26 -0700 3715 3716 Changes affecting current and near-future timestamps 3717 3718 Morocco now observes DST from the last Sunday in March to the last 3719 Sunday in October, not April to September respectively. (Thanks 3720 to Steffen Thorsen.) 3721 3722 Changes affecting 'zic' 3723 3724 'zic' now runs on platforms that lack both hard links and symlinks. 3725 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 3726 Also, fix some bugs on platforms that lack hard links but have symlinks. 3727 3728 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 3729 to predict the far future, fixing a bug introduced in 2013e. 3730 3731 Changes affecting the build procedure 3732 3733 The 'leapseconds' file is again put into the tzdata tarball. 3734 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 3735 Matt Burgess and Ian Abbott.) The timestamps of these and other 3736 dependent files in tarballs are adjusted more consistently. 3737 3738 Changes affecting documentation and commentary 3739 3740 The README file is now part of the data tarball as well as the code. 3741 It now states that files are public domain unless otherwise specified. 3742 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 3743 Its details about the 1989 release moved to a place of honor near 3744 the end of NEWS. 3745 3746 3747 Release 2013f - 2013-09-24 23:37:36 -0700 3748 3749 Changes affecting near-future timestamps 3750 3751 Tocantins will very likely not observe DST starting this spring. 3752 (Thanks to Steffen Thorsen.) 3753 3754 Jordan will likely stay at UT +03 indefinitely, and will not fall 3755 back this fall. 3756 3757 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 3758 3759 Changes affecting API 3760 3761 The types of the global variables 'timezone' and 'altzone' (if present) 3762 have been changed back to 'long'. This is required for 'timezone' 3763 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 3764 These variables were originally 'long' in the tz code, but were 3765 mistakenly changed to 'time_t' in 1987; nobody reported the 3766 incompatibility until now. The difference matters on x32, where 3767 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 3768 3769 Changes affecting the build procedure 3770 3771 Avoid long strings in leapseconds.awk to work around a mawk bug. 3772 (Thanks to Cyril Baurand.) 3773 3774 Changes affecting documentation and commentary 3775 3776 New file 'NEWS' that contains release notes like this one. 3777 3778 Paraguay's law does not specify DST transition time; 00:00 is customary. 3779 (Thanks to Waldemar Villamayor-Venialbo.) 3780 3781 Minor capitalization fixes. 3782 3783 Changes affecting version-control only 3784 3785 The experimental GitHub repository now contains annotated and 3786 signed tags for recent releases, e.g., '2013e' for Release 2013e. 3787 Releases are tagged starting with 2012e; earlier releases were 3788 done differently, and tags would either not have a simple name or 3789 not exactly match what was released. 3790 3791 'make set-timestamps' is now simpler and a bit more portable. 3792 3793 3794 Release 2013e - 2013-09-19 23:50:04 -0700 3795 3796 Changes affecting near-future timestamps 3797 3798 This year Fiji will start DST on October 27, not October 20. 3799 (Thanks to David Wheeler for the heads-up.) For now, guess that 3800 Fiji will continue to spring forward the Sunday before the fourth 3801 Monday in October. 3802 3803 Changes affecting current and future time zone abbreviations 3804 3805 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 3806 time zone abbreviations since 1932. (Thanks to George Ziegler, 3807 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 3808 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 3809 Asia/Makassar, and Asia/Pontianak. 3810 3811 Use ART (UT -03, standard time), rather than WARST (also -03, but 3812 daylight saving time) for San Luis, Argentina since 2009. 3813 3814 Changes affecting Godthb timestamps after 2037 if version mismatch 3815 3816 Allow POSIX-like TZ strings where the transition time's hour can 3817 range from -167 through 167, instead of the POSIX-required 0 3818 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 3819 new Fiji rules. This is a more-compact way to represent 3820 far-future timestamps for America/Godthab, America/Santiago, 3821 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 3822 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 3823 this change. (Derived from a suggestion by Arthur David Olson.) 3824 3825 Allow POSIX-like TZ strings where daylight saving time is in 3826 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 3827 Argentina Summer Time all year. This supports a more-compact way 3828 to represent the 2013d data for America/Argentina/San_Luis. 3829 Because of the change for San Luis noted above this change does not 3830 affect the current data. (Thanks to Andrew Main (Zefram) for 3831 suggestions that improved this change.) 3832 3833 Where these two TZ changes take effect, there is a minor extension 3834 to the tz file format in that it allows new values for the 3835 embedded TZ-format string, and the tz file format version number 3836 has therefore been increased from 2 to 3 as a precaution. 3837 Version-2-based client code should continue to work as before for 3838 all timestamps before 2038. Existing version-2-based client code 3839 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 3840 files, and typically works in practice even for timestamps after 3841 2037; the only known exception is America/Godthab. 3842 3843 Changes affecting timestamps before 1970 3844 3845 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 3846 some errors before 1947. 3847 3848 Some zones have been turned into links, when they differ from existing 3849 zones only in older data entries that were likely invented or that 3850 differ only in LMT or transitions from LMT. These changes affect 3851 only timestamps before 1943. The affected zones are: 3852 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 3853 America/Grenada, America/Guadeloupe, America/Marigot, 3854 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 3855 America/St_Lucia, America/St_Thomas, America/St_Vincent, 3856 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 3857 confirming that the old Europe/Vaduz zone was wrong and the new 3858 link is better for WWII-era times.) 3859 3860 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 3861 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 3862 from 1890 to 1912. 3863 3864 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 3865 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 3866 to Alois Treindl.) 3867 3868 Change the date of the circa-1850 Zurich transition from 1849-09-12 3869 to 1853-07-16, overriding Shanks with data from Messerli about 3870 postal and telegraph time in Switzerland. 3871 3872 Changes affecting time zone abbreviations before 1970 3873 3874 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 3875 as Jakarta was called Batavia back then. 3876 3877 Changes affecting API 3878 3879 The 'zic' command now outputs a dummy transition when far-future 3880 data can't be summarized using a TZ string, and uses a 402-year 3881 window rather than a 400-year window. For the current data, this 3882 affects only the Asia/Tehran file. It does not affect any of the 3883 timestamps that this file represents, so zdump outputs the same 3884 information as before. (Thanks to Andrew Main (Zefram).) 3885 3886 The 'date' command has a new '-r' option, which lets you specify 3887 the integer time to display, a la FreeBSD. 3888 3889 The 'tzselect' command has two new options '-c' and '-n', which lets you 3890 select a zone based on latitude and longitude. 3891 3892 The 'zic' command's '-v' option now warns about constructs that 3893 require the new version-3 binary file format. (Thanks to Arthur 3894 David Olson for the suggestion.) 3895 3896 Support for floating-point time_t has been removed. 3897 It was always dicey, and POSIX no longer requires it. 3898 (Thanks to Eric Blake for suggesting to the POSIX committee to 3899 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 3900 Heninger, Arthur David Olson, and Alois Treindl, for reporting 3901 bugs and elucidating some of the corners of the old floating-point 3902 implementation.) 3903 3904 The signatures of 'offtime', 'timeoff', and 'gtime' have been 3905 changed back to the old practice of using 'long' to represent UT 3906 offsets. This had been inadvertently and mistakenly changed to 3907 'int_fast32_t'. (Thanks to Christos Zoulas.) 3908 3909 The code avoids undefined behavior on integer overflow in some 3910 more places, including gmtime, localtime, mktime and zdump. 3911 3912 Changes affecting the zdump utility 3913 3914 zdump now outputs "UT" when referring to Universal Time, not "UTC". 3915 "UTC" does not make sense for timestamps that predate the introduction 3916 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen 3917 for clarifying UT vs UTC.) 3918 3919 Data changes affecting behavior of tzselect and similar programs 3920 3921 Country code BQ is now called the more-common name "Caribbean Netherlands" 3922 rather than the more-official "Bonaire, St Eustatius & Saba". 3923 3924 Remove from zone.tab the names America/Montreal, America/Shiprock, 3925 and Antarctica/South_Pole, as they are equivalent to existing 3926 same-country-code zones for post-1970 timestamps. The data entries for 3927 these names are unchanged, so the names continue to work as before. 3928 3929 Changes affecting code internals 3930 3931 zic -c now runs way faster on 64-bit hosts when given large numbers. 3932 3933 zic now uses vfprintf to avoid allocating and freeing some memory. 3934 3935 tzselect now computes the list of continents from the data, 3936 rather than have it hard-coded. 3937 3938 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 3939 3940 Changes affecting the build procedure 3941 3942 The 'leapseconds' file is now generated automatically from a 3943 new file 'leap-seconds.list', which is a copy of 3944 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 3945 A new source file 'leapseconds.awk' implements this. 3946 The goal is simplification of the future maintenance of 'leapseconds'. 3947 3948 When building the 'posix' or 'right' subdirectories, if the 3949 subdirectory would be a copy of the default subdirectory, it is 3950 now made a symbolic link if that is supported. This saves about 3951 2 MB of file system space. 3952 3953 The links America/Shiprock and Antarctica/South_Pole have been 3954 moved to the 'backward' file. This affects only nondefault builds 3955 that omit 'backward'. 3956 3957 Changes affecting version-control only 3958 3959 .gitignore now ignores 'date'. 3960 3961 Changes affecting documentation and commentary 3962 3963 Changes to the 'tzfile' man page 3964 3965 It now mentions that the binary file format may be extended in 3966 future versions by appending data. 3967 3968 It now refers to the 'zdump' and 'zic' man pages. 3969 3970 Changes to the 'zic' man page 3971 3972 It lists conditions that elicit a warning with '-v'. 3973 3974 It says that the behavior is unspecified when duplicate names 3975 are given, or if the source of one link is the target of another. 3976 3977 Its examples are updated to match the latest data. 3978 3979 The definition of white space has been clarified slightly. 3980 (Thanks to Michael Deckers.) 3981 3982 Changes to the 'Theory' file 3983 3984 There is a new section about the accuracy of the tz database, 3985 describing the many ways that errors can creep in, and 3986 explaining why so many of the pre-1970 timestamps are wrong or 3987 misleading (thanks to Steve Allen, Lester Caine, and Garrett 3988 Wollman for discussions that contributed to this). 3989 3990 The 'Theory' file describes LMT better (this follows a 3991 suggestion by Guy Harris). 3992 3993 It refers to the 2013 edition of POSIX rather than the 2004 edition. 3994 3995 It's mentioned that excluding 'backward' should not affect the 3996 other data, and it suggests at least one zone.tab name per 3997 inhabited country (thanks to Stephen Colebourne). 3998 3999 Some longstanding restrictions on names are documented, e.g., 4000 'America/New_York' precludes 'America/New_York/Bronx'. 4001 4002 It gives more reasons for the 1970 cutoff. 4003 4004 It now mentions which time_t variants are supported, such as 4005 signed integer time_t. (Thanks to Paul Goyette for reporting 4006 typos in an experimental version of this change.) 4007 4008 (Thanks to Philip Newton for correcting typos in these changes.) 4009 4010 Documentation and commentary is more careful to distinguish UT in 4011 general from UTC in particular. (Thanks to Steve Allen.) 4012 4013 Add a better source for the Zurich 1894 transition. 4014 (Thanks to Pierre-Yves Berger.) 4015 4016 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 4017 4018 4019 Release 2013d - 2013-07-05 07:38:01 -0700 4020 4021 Changes affecting future timestamps: 4022 4023 Morocco's midsummer transitions this year are July 7 and August 10, 4024 not July 9 and August 8. (Thanks to Andrew Paprocki.) 4025 4026 Israel now falls back on the last Sunday of October. 4027 (Thanks to Ephraim Silverberg.) 4028 4029 Changes affecting past timestamps: 4030 4031 Specify Jerusalem's location more precisely; this changes the pre-1880 4032 times by 2 s. 4033 4034 Changing affecting metadata only: 4035 4036 Fix typos in the entries for country codes BQ and SX. 4037 4038 Changes affecting code: 4039 4040 Rework the code to fix a bug with handling Australia/Macquarie on 4041 32-bit hosts (thanks to Arthur David Olson). 4042 4043 Port to platforms like NetBSD, where time_t can be wider than long. 4044 4045 Add support for testing time_t types other than the system's. 4046 Run 'make check_time_t_alternatives' to try this out. 4047 Currently, the tests fail for unsigned time_t; 4048 this should get fixed at some point. 4049 4050 Changes affecting documentation and commentary: 4051 4052 Deemphasize the significance of national borders. 4053 4054 Update the zdump man page. 4055 4056 Remove obsolete NOID comment (thanks to Denis Excoffier). 4057 4058 Update several URLs and comments in the web pages. 4059 4060 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 4061 4062 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 4063 4064 4065 Release 2013c - 2013-04-19 16:17:40 -0700 4066 4067 Changes affecting current and future timestamps: 4068 4069 Palestine observed DST starting March 29, 2013. (Thanks to 4070 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 4071 with the predicted rules being the last Thursday in March at 24:00 4072 to the first Friday on or after September 21 at 01:00. 4073 4074 Assume that the recent change to Paraguay's DST rules is permanent, 4075 by moving the end of DST to the 4th Sunday in March every year. 4076 (Thanks to Carlos Ral Perasso.) 4077 4078 Changes affecting past timestamps: 4079 4080 Fix some historical data for Palestine to agree with that of 4081 timeanddate.com, as follows: 4082 4083 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 4084 00:00 Apr 1. 4085 4086 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 4087 02:00. 4088 4089 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 4090 4091 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 4092 4093 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 4094 4095 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 4096 4097 Fix times of habitation for Macquarie to agree with the Tasmania 4098 Parks & Wildlife Service history, which indicates that permanent 4099 habitation was 1899-1919 and 1948 on. 4100 4101 Changing affecting metadata only: 4102 4103 Macquarie Island is politically part of Australia, not Antarctica. 4104 (Thanks to Tobias Conradi.) 4105 4106 Sort Macquarie more-consistently with other parts of Australia. 4107 (Thanks to Tim Parenti.) 4108 4109 4110 Release 2013b - 2013-03-10 22:33:40 -0700 4111 4112 Changes affecting current and future timestamps: 4113 4114 Haiti uses US daylight-saving rules this year, and presumably future years. 4115 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 4116 4117 Paraguay will end DST on March 24 this year. 4118 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 4119 4120 Morocco does not observe DST during Ramadan; 4121 try to predict Ramadan in Morocco as best we can. 4122 (Thanks to Erik Homoet for the heads-up.) 4123 4124 Changes affecting commentary: 4125 4126 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 4127 Update URL for Solaris. Mention Internet RFC 6557. 4128 Update Internet RFCs 2445->5545, 2822->5322. 4129 Switch from FTP to HTTP for Internet RFCs. 4130 4131 4132 Release 2013a - 2013-02-27 09:20:35 -0800 4133 4134 Change affecting binary data format: 4135 4136 The zone offset at the end of version-2-format zone files is now 4137 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 4138 4139 Changes affecting current and future timestamps: 4140 4141 Chile's 2013 rules, and we guess rules for 2014 and later, will be 4142 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 4143 (Thanks to Steffen Thorsen and Robert Elz.) 4144 4145 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 4146 (Thanks to Tobias Conradi and Arthur David Olson.) 4147 4148 Many changes affect historical timestamps before 1940. 4149 These were deduced from: Milne J. Civil time. Geogr J. 1899 4150 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 4151 4152 Changes affecting the code: 4153 4154 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 4155 the data). (Thanks to Arthur David Olson.) 4156 4157 Fix localtime bug when time_t is unsigned and data files were generated 4158 by a signed time_t system. (Thanks to Doug Bailey for reporting and 4159 to Arthur David Olson for fixing.) 4160 4161 Allow the email address for bug reports to be set by the packager. 4162 The default is tz (a] iana.org, as before. (Thanks to Joseph S. Myers.) 4163 4164 Update HTML checking to be compatible with Ubuntu 12.10. 4165 4166 Check that files are a safe subset of ASCII. At some point we may 4167 relax this requirement to a safe subset of UTF-8. Without the 4168 check, some non-UTF-8 encodings were leaking into the distribution. 4169 4170 Commentary changes: 4171 4172 Restore a comment about copyright notices that was inadvertently deleted. 4173 (Thanks to Arthur David Olson.) 4174 4175 Improve the commentary about which districts observe what times 4176 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 4177 4178 Add web page links to tz.js. 4179 4180 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 4181 4182 4183 Release 2012j - 2012-11-12 18:34:49 -0800 4184 4185 Libya moved to CET this weekend, but with DST planned next year. 4186 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 4187 4188 Signatures now have the extension .asc, not .sign, as that's more 4189 standard. (Thanks to Phil Pennock.) 4190 4191 The output of 'zdump --version', and of 'zic --version', now 4192 uses a format that is more typical for --version. 4193 (Thanks to Joseph S. Myers.) 4194 4195 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 4196 now uses tz (a] iana.org rather than the old elsie address. 4197 4198 zic -v now complains about abbreviations that are less than 3 4199 or more than 6 characters, as per Posix. Formerly, it checked 4200 for abbreviations that were more than 3. 4201 4202 'make public' no longer puts its temporary directory under /tmp, 4203 and uses the just-built zic rather than the system zic. 4204 4205 Various fixes to documentation and commentary. 4206 4207 4208 Release 2012i - 2012-11-03 12:57:09 -0700 4209 4210 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 4211 4212 Linker flags can now be specified via LDFLAGS. 4213 AWK now defaults to 'awk', not 'nawk'. 4214 The shell in tzselect now defaults to /bin/bash, but this can 4215 be overridden by specifying KSHELL. 4216 The main web page now mentions the unofficial GitHub repository. 4217 (Thanks to Mike Frysinger.) 4218 4219 Tarball signatures can now be built by running 'make signatures'. 4220 There are also new makefile rules 'tarballs', 'check_public', and 4221 separate makefile rules for each tarball and signature file. 4222 A few makefile rules are now more portable to strict POSIX. 4223 4224 The main web page now lists the canonical IANA URL. 4225 4226 4227 Release 2012h - 2012-10-26 22:49:10 -0700 4228 4229 Bahia no longer has DST. (Thanks to Kelley Cook.) 4230 4231 Tocantins has DST. (Thanks to Rodrigo Severo.) 4232 4233 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 4234 4235 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 4236 4237 Web page updates. 4238 4239 More C modernization, except that at Arthur David Olson's suggestion 4240 the instances of 'register' were kept. 4241 4242 4243 Release 2012g - 2012-10-17 20:59:45 -0700 4244 4245 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 4246 4247 Palestine fall 2012. (Thanks to Steffen Thorsen.) 4248 4249 Assume C89. 4250 4251 To attack the version-number problem, this release ships the file 4252 'Makefile' (which contains the release number) in both the tzcode and 4253 the tzdata tarballs. The two Makefiles are identical, and should be 4254 identical in any matching pair of tarballs, so it shouldn't matter 4255 which order you extract the tarballs. Perhaps we can come up with a 4256 better version-number scheme at some point; this scheme does have the 4257 virtue of not adding more files. 4258 4259 4260 Release 2012f - 2012-09-12 23:17:03 -0700 4261 4262 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 4263 20 this year. (Thanks to Steffen Thorsen.) 4264 4265 4266 Release 2012e - 2012-08-02 20:44:55 -0700 4267 4268 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 4269 (Thanks to Steffen Thorsen.) 4270 4271 * Use a single version number for both code and data. 4272 4273 * .gitignore: New file. 4274 4275 * Remove trailing white space. 4276 4277 4278 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 4279 4280 Changes for Morocco's timestamps, which take effect in a couple of 4281 hours, along with infrastructure changes to accommodate how the tz 4282 code and data are released on IANA. 4283 4284 4285 Release data2012c - 2012-03-27 12:17:25 -0400 4286 4287 africa 4288 Summer time changes for Morocco (to start late April 2012) 4289 4290 asia 4291 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 4292 4293 northamerica 4294 Haiti following US/Canada rules for 2012 (and we're assuming, 4295 for now anyway, for the future). 4296 4297 4298 Release 2012b - 2012-03-02 12:29:15 +0700 4299 4300 There is just one change to tzcode2012b (compared with 2012a): 4301 the Makefile that was accidentally included with 2012a has been 4302 replaced with the version that should have been there, which is 4303 identical with the previous version (from tzcode2011i). 4304 4305 There are just two changes in tzdata2012b compared with 2012a. 4306 4307 Most significantly, summer time in Cuba has been delayed 3 weeks 4308 (now starts April 1 rather than March 11). Since Mar 11 (the old start 4309 date, as listed in 2012a) is just a little over a week away, this 4310 change is urgent. 4311 4312 Less importantly, an excess tab in one of the changes in zone.tab 4313 in 2012a has been removed. 4314 4315 4316 Release 2012a - 2012-03-01 18:28:10 +0700 4317 4318 The changes in tzcode2012a (compared to the previous version, 2011i) 4319 are entirely to the README and tz-art.htm and tz-link.htm files, if 4320 none of those concern you, you can ignore the code update. The changes 4321 reflect the changed addresses for the mailing list and the code and 4322 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 4323 has been added to tz-link.htm). 4324 4325 In tzdata2012a (compared to the previous release, which was 2011n) 4326 the major changes are: 4327 Chile 2011/2012 and 2012/2013 summer time date adjustments. 4328 Falkland Islands onto permanent summer time (we're assuming for the 4329 foreseeable future, though 2012 is all we're fairly certain of.) 4330 Armenia has abolished Summer Time. 4331 Tokelau jumped the International Date Line back last December 4332 (just the same as their near neighbour, Samoa). 4333 America/Creston is a new zone for a small area of British Columbia 4334 There will be a leapsecond 2012-06-30 23:59:60 UTC. 4335 4336 Other minor changes are: 4337 Corrections to 1918 Canadian summer time end dates. 4338 Updated URL for UK time zone history (in comments) 4339 A few typos in Le Corre's list of free French place names (comments) 4340 4341 4342 Release data2011n - 2011-10-30 14:57:54 +0700 4343 4344 There are three changes of note - most urgently, Cuba (America/Havana) 4345 has extended summer time by two weeks, now to end on Nov 13, rather than 4346 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 4347 (Europe/Tiraspol) decided not to split from the rest of Moldova after 4348 all, and consequently that zone has been removed (again) and reinstated 4349 in the "backward" file as a link to Europe/Chisinau. And third, the 4350 end date for Fiji's summer time this summer was moved forward from the 4351 earlier planned Feb 26, to Jan 22. 4352 4353 Apart from that, Moldova (MD) returns to a single entry in zone.tab 4354 (and the incorrect syntax that was in the 2011m version of that file 4355 is so fixed - it would have been fixed in a different way had this 4356 change not happened - that's the "missing" sccs version id). 4357 4358 4359 Release data2011m - 2011-10-24 21:42:16 +0700 4360 4361 In particular, the typos in comments in the data (2011-11-17 should have 4362 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 4363 Tim Parenti noted) have been fixed, and the change for Ukraine has been 4364 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to 4365 Tim Parenti, and also Denys Gavrysh) 4366 4367 In addition, I added Europe/Tiraspol to zone.tab. 4368 4369 This time, all the files have new version numbers... (including the files 4370 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 4371 version numbers there...) 4372 4373 4374 Release data2011l - 2011-10-10 11:15:43 +0700 4375 4376 There are just 2 changes that cause different generated tzdata files from 4377 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 4378 is included, but commented out. Compared with the diff I sent out last week, 4379 this version also includes attributions for the sources for the changes 4380 (in much the same format as ado used, but the html tags have not been 4381 checked, verified, or used in any way at all, so if there are errors there, 4382 please let me know.) 4383 4384 4385 Release data2011k - 2011-09-20 17:54:03 -0400 4386 4387 [not summarized] 4388 4389 4390 Release data2011j - 2011-09-12 09:22:49 -0400 4391 4392 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 4393 Tanzania); there are also two spelling corrections to comments in 4394 the australasia file (with thanks to Christos Zoulas). 4395 4396 4397 Release 2011i - 2011-08-29 05:56:32 -0400 4398 4399 [not summarized] 4400 4401 4402 Release data2011h - 2011-06-15 18:41:48 -0400 4403 4404 Russia and Curaao changes 4405 4406 4407 Release 2011g - 2011-04-25 09:07:22 -0400 4408 4409 update the rules for Egypt to reflect its abandonment of DST this year 4410 4411 4412 Release 2011f - 2011-04-06 17:14:53 -0400 4413 4414 [not summarized] 4415 4416 4417 Release 2011e - 2011-03-31 16:04:38 -0400 4418 4419 Morocco, Chile, and tz-link changes 4420 4421 4422 Release 2011d - 2011-03-14 09:18:01 -0400 4423 4424 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 4425 4426 4427 Release 2011c - 2011-03-07 09:30:09 -0500 4428 4429 These do affect current timestamps in Chile and Annette Island, Canada. 4430 4431 4432 Release 2011b - 2011-02-07 08:44:50 -0500 4433 4434 [not summarized] 4435 4436 4437 Release 2011a - 2011-01-24 10:30:16 -0500 4438 4439 [not summarized] 4440 4441 4442 Release data2010o - 2010-11-01 09:18:23 -0400 4443 4444 change to the end of DST in Fiji in 2011 4445 4446 4447 Release 2010n - 2010-10-25 08:19:17 -0400 4448 4449 [not summarized] 4450 4451 4452 Release 2010m - 2010-09-27 09:24:48 -0400 4453 4454 Hong Kong, Vostok, and zic.c changes 4455 4456 4457 Release 2010l - 2010-08-16 06:57:25 -0400 4458 4459 [not summarized] 4460 4461 4462 Release 2010k - 2010-07-26 10:42:27 -0400 4463 4464 [not summarized] 4465 4466 4467 Release 2010j - 2010-05-10 09:07:48 -0400 4468 4469 changes for Baha de Banderas and for version naming 4470 4471 4472 Release data2010i - 2010-04-16 18:50:45 -0400 4473 4474 the end of DST in Morocco on 2010-08-08 4475 4476 4477 Release data2010h - 2010-04-05 09:58:56 -0400 4478 4479 [not summarized] 4480 4481 4482 Release data2010g - 2010-03-24 11:14:53 -0400 4483 4484 [not summarized] 4485 4486 4487 Release 2010f - 2010-03-22 09:45:46 -0400 4488 4489 [not summarized] 4490 4491 4492 Release data2010e - 2010-03-08 14:24:27 -0500 4493 4494 corrects the Dhaka bug found by Danvin Ruangchan 4495 4496 4497 Release data2010d - 2010-03-06 07:26:01 -0500 4498 4499 [not summarized] 4500 4501 4502 Release 2010c - 2010-03-01 09:20:58 -0500 4503 4504 changes including KRE's suggestion for earlier initialization of 4505 "goahead" and "goback" structure elements 4506 4507 4508 Release code2010a - 2010-02-16 10:40:04 -0500 4509 4510 [not summarized] 4511 4512 4513 Release data2010b - 2010-01-20 12:37:01 -0500 4514 4515 Mexico changes 4516 4517 4518 Release data2010a - 2010-01-18 08:30:04 -0500 4519 4520 changes to Dhaka 4521 4522 4523 Release data2009u - 2009-12-26 08:32:28 -0500 4524 4525 changes to DST in Bangladesh 4526 4527 4528 Release 2009t - 2009-12-21 13:24:27 -0500 4529 4530 [not summarized] 4531 4532 4533 Release data2009s - 2009-11-14 10:26:32 -0500 4534 4535 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 4536 4537 4538 Release 2009r - 2009-11-09 10:10:31 -0500 4539 4540 "antarctica" and "tz-link.htm" changes 4541 4542 4543 Release 2009q - 2009-11-02 09:12:40 -0500 4544 4545 with two corrections as reported by Eric Muller and Philip Newton 4546 4547 4548 Release data2009p - 2009-10-23 15:05:27 -0400 4549 4550 Argentina (including San Luis) changes (with the correction from 4551 Mariano Absatz) 4552 4553 4554 Release data2009o - 2009-10-14 16:49:38 -0400 4555 4556 Samoa (commentary only), Pakistan, and Bangladesh changes 4557 4558 4559 Release data2009n - 2009-09-22 15:13:38 -0400 4560 4561 added commentary for Argentina and a change to the end of DST in 4562 2009 in Pakistan 4563 4564 4565 Release data2009m - 2009-09-03 10:23:43 -0400 4566 4567 Samoa and Palestine changes 4568 4569 4570 Release data2009l - 2009-08-14 09:13:07 -0400 4571 4572 Samoa (comments only) and Egypt 4573 4574 4575 Release 2009k - 2009-07-20 09:46:08 -0400 4576 4577 [not summarized] 4578 4579 4580 Release data2009j - 2009-06-15 06:43:59 -0400 4581 4582 Bangladesh change (with a short turnaround since the DST change is 4583 impending) 4584 4585 4586 Release 2009i - 2009-06-08 09:21:22 -0400 4587 4588 updating for DST in Bangladesh this year 4589 4590 4591 Release 2009h - 2009-05-26 09:19:14 -0400 4592 4593 [not summarized] 4594 4595 4596 Release data2009g - 2009-04-20 16:34:07 -0400 4597 4598 Cairo 4599 4600 4601 Release data2009f - 2009-04-10 11:00:52 -0400 4602 4603 correct DST in Pakistan 4604 4605 4606 Release 2009e - 2009-04-06 09:08:11 -0400 4607 4608 [not summarized] 4609 4610 4611 Release 2009d - 2009-03-23 09:38:12 -0400 4612 4613 Morocco, Tunisia, Argentina, and American Astronomical Society changes 4614 4615 4616 Release data2009c - 2009-03-16 09:47:51 -0400 4617 4618 change to the start of Cuban DST 4619 4620 4621 Release 2009b - 2009-02-09 11:15:22 -0500 4622 4623 [not summarized] 4624 4625 4626 Release 2009a - 2009-01-21 10:09:39 -0500 4627 4628 [not summarized] 4629 4630 4631 Release data2008i - 2008-10-21 12:10:25 -0400 4632 4633 southamerica and zone.tab files, with Argentina DST rule changes and 4634 United States zone reordering and recommenting 4635 4636 4637 Release 2008h - 2008-10-13 07:33:56 -0400 4638 4639 [not summarized] 4640 4641 4642 Release 2008g - 2008-10-06 09:03:18 -0400 4643 4644 Fix a broken HTML anchor and update Brazil's DST transitions; 4645 there's also a slight reordering of information in tz-art.htm. 4646 4647 4648 Release data2008f - 2008-09-09 22:33:26 -0400 4649 4650 [not summarized] 4651 4652 4653 Release 2008e - 2008-07-28 14:11:17 -0400 4654 4655 changes by Arthur David Olson and Jesper Nrgaard Welen 4656 4657 4658 Release data2008d - 2008-07-07 09:51:38 -0400 4659 4660 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 4661 4662 4663 Release data2008c - 2008-05-19 17:48:03 -0400 4664 4665 Pakistan, Morocco, and Mongolia 4666 4667 4668 Release data2008b - 2008-03-24 08:30:59 -0400 4669 4670 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 4671 link provided 4672 4673 4674 Release 2008a - 2008-03-08 05:42:16 -0500 4675 4676 [not summarized] 4677 4678 4679 Release 2007k - 2007-12-31 10:25:22 -0500 4680 4681 most importantly, changes to the "southamerica" file based on 4682 Argentina's readoption of daylight saving time 4683 4684 4685 Release 2007j - 2007-12-03 09:51:01 -0500 4686 4687 1. eliminate the "P" (parameter) macro; 4688 4689 2. the "noncontroversial" changes circulated on the time zone 4690 mailing list (less the changes to "logwtmp.c"); 4691 4692 3. eliminate "too many transition" errors when "min" is used in time 4693 zone rules; 4694 4695 4. changes by Paul Eggert (including updated information for Venezuela). 4696 4697 4698 Release data2007i - 2007-10-30 10:28:11 -0400 4699 4700 changes for Cuba and Syria 4701 4702 4703 Release 2007h - 2007-10-01 10:05:51 -0400 4704 4705 changes by Paul Eggert, as well as an updated link to the ICU 4706 project in tz-link.htm 4707 4708 4709 Release 2007g - 2007-08-20 10:47:59 -0400 4710 4711 changes by Paul Eggert 4712 4713 The "leapseconds" file has been updated to incorporate the most 4714 recent International Earth Rotation and Reference Systems Service 4715 (IERS) bulletin. 4716 4717 There's an addition to tz-art.htm regarding the television show "Medium". 4718 4719 4720 Release 2007f - 2007-05-07 10:46:46 -0400 4721 4722 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 4723 Zealand) 4724 4725 changes to zic.c to allow hour values greater than 24 (along with 4726 Paul's improved time value overflow checking) 4727 4728 4729 Release 2007e - 2007-04-02 10:11:52 -0400 4730 4731 Syria and Honduras changes by Paul Eggert 4732 4733 zic.c variable renaming changes by Arthur David Olson 4734 4735 4736 Release 2007d - 2007-03-20 08:48:30 -0400 4737 4738 changes by Paul Eggert 4739 4740 the elimination of white space at the ends of lines 4741 4742 4743 Release 2007c - 2007-02-26 09:09:37 -0500 4744 4745 changes by Paul Eggert 4746 4747 4748 Release 2007b - 2007-02-12 09:34:20 -0500 4749 4750 Paul Eggert's proposed change to the quotation handling logic in zic.c. 4751 4752 changes to the commentary in "leapseconds" reflecting the IERS 4753 announcement that there is to be no positive leap second at the end 4754 of June 2007. 4755 4756 4757 Release 2007a - 2007-01-08 12:28:29 -0500 4758 4759 changes by Paul Eggert 4760 4761 Derick Rethans's Asmara change 4762 4763 Oscar van Vlijmen's Easter Island local mean time change 4764 4765 symbolic link changes 4766 4767 4768 Release 2006p - 2006-11-27 08:54:27 -0500 4769 4770 changes by Paul Eggert 4771 4772 4773 Release 2006o - 2006-11-06 09:18:07 -0500 4774 4775 changes by Paul Eggert 4776 4777 4778 Release 2006n - 2006-10-10 11:32:06 -0400 4779 4780 changes by Paul Eggert 4781 4782 4783 Release 2006m - 2006-10-02 15:32:35 -0400 4784 4785 changes for Uruguay, Palestine, and Egypt by Paul Eggert 4786 4787 (minimalist) changes to zic.8 to clarify "until" information 4788 4789 4790 Release data2006l - 2006-09-18 12:58:11 -0400 4791 4792 Paul's best-effort work on this coming weekend's Egypt time change 4793 4794 4795 Release 2006k - 2006-08-28 12:19:09 -0400 4796 4797 changes by Paul Eggert 4798 4799 4800 Release 2006j - 2006-08-21 09:56:32 -0400 4801 4802 changes by Paul Eggert 4803 4804 4805 Release code2006i - 2006-08-07 12:30:55 -0400 4806 4807 localtime.c fixes 4808 4809 Ken Pizzini's conversion script 4810 4811 4812 Release code2006h - 2006-07-24 09:19:37 -0400 4813 4814 adds public domain notices to four files 4815 4816 includes a fix for transition times being off by a second 4817 4818 adds a new recording to the "arts" file (information courtesy Colin Bowern) 4819 4820 4821 Release 2006g - 2006-05-08 17:18:09 -0400 4822 4823 northamerica changes by Paul Eggert 4824 4825 4826 Release 2006f - 2006-05-01 11:46:00 -0400 4827 4828 a missing version number problem is fixed (with thanks to Bradley 4829 White for catching the problem) 4830 4831 4832 Release 2006d - 2006-04-17 14:33:43 -0400 4833 4834 changes by Paul Eggert 4835 4836 added new items to tz-arts.htm that were found by Paul 4837 4838 4839 Release 2006c - 2006-04-03 10:09:32 -0400 4840 4841 two sets of data changes by Paul Eggert 4842 4843 a fencepost error fix in zic.c 4844 4845 changes to zic.c and the "europe" file to minimize differences 4846 between output produced by the old 32-bit zic and the new 64-bit 4847 version 4848 4849 4850 Release 2006b - 2006-02-20 10:08:18 -0500 4851 [tz32code2006b + tz64code2006b + tzdata2006b] 4852 4853 64-bit code 4854 4855 All SCCS IDs were bumped to "8.1" for this release. 4856 4857 4858 Release 2006a - 2006-01-30 08:59:31 -0500 4859 4860 changes by Paul Eggert (in particular, Indiana time zone moves) 4861 4862 an addition to the zic manual page to describe how special-case 4863 transitions are handled 4864 4865 4866 Release 2005r - 2005-12-27 09:27:13 -0500 4867 4868 Canadian changes by Paul Eggert 4869 4870 They also add "<pre>" directives to time zone data files and reflect 4871 changes to warning message logic in "zdump.c" (but with calls to 4872 "gettext" kept unbundled at the suggestion of Ken Pizzini). 4873 4874 4875 Release 2005q - 2005-12-13 09:17:09 -0500 4876 4877 Nothing earth-shaking here: 4878 1. Electronic mail addresses have been removed. 4879 2. Casts of the return value of exit have been removed. 4880 3. Casts of the argument of is.* macros have been added. 4881 4. Indentation in one section of zic.c has been fixed. 4882 5. References to dead URLs in the data files have been dealt with. 4883 4884 4885 Release 2005p - 2005-12-05 10:30:53 -0500 4886 4887 "systemv", "tz-link.htm", and "zdump.c" changes 4888 (less the casts of arguments to the is* macros) 4889 4890 4891 Release 2005o - 2005-11-28 10:55:26 -0500 4892 4893 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 4894 4895 zdump.c lint fixes by Arthur David Olson 4896 4897 4898 Release 2005n - 2005-10-03 09:44:09 -0400 4899 4900 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 4901 et al. changes) 4902 4903 4904 Release 2005m - 2005-08-29 12:15:40 -0400 4905 4906 changes by Paul Eggert (with a small tweak to the tz-art change) 4907 4908 a declaration of an unused variable has been removed from zdump.c 4909 4910 4911 Release 2005l - 2005-08-22 12:06:39 -0400 4912 4913 changes by Paul Eggert 4914 4915 overflow/underflow checks by Arthur David Olson, minus changes to 4916 the "Theory" file about the pending addition of 64-bit data (I grow 4917 less confident of the changes being accepted with each passing day, 4918 and the changes no longer increase the data files nine-fold--there's 4919 less than a doubling in size by my local Sun's reckoning) 4920 4921 4922 Release 2005k - 2005-07-14 14:14:24 -0400 4923 4924 The "leapseconds" file has been edited to reflect the recently 4925 announced leap second at the end of 2005. 4926 4927 I've also deleted electronic mail addresses from the files as an 4928 anti-spam measure. 4929 4930 4931 Release 2005j - 2005-06-13 14:34:13 -0400 4932 4933 These reflect changes to limit the length of time zone abbreviations 4934 and the characters used in those abbreviations. 4935 4936 There are also changes to handle POSIX-style "quoted" timezone 4937 environment variables. 4938 4939 The changes were circulated on the time zone mailing list; the only 4940 change since then was the removal of a couple of minimum-length of 4941 abbreviation checks. 4942 4943 4944 Release data2005i - 2005-04-21 15:04:16 -0400 4945 4946 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 4947 4948 4949 Release 2005h - 2005-04-04 11:24:47 -0400 4950 4951 changes by Paul Eggert 4952 4953 minor changes to Makefile and zdump.c to produce more useful output 4954 when doing a "make typecheck" 4955 4956 4957 Release 2005g - 2005-03-14 10:11:21 -0500 4958 4959 changes by Paul Eggert (a change to current DST rules in Uruguay and 4960 an update to a link to time zone software) 4961 4962 4963 Release 2005f - 2005-03-01 08:45:32 -0500 4964 4965 data and documentation changes by Paul Eggert 4966 4967 4968 Release 2005e - 2005-02-10 15:59:44 -0500 4969 4970 [not summarized] 4971 4972 4973 Release code2005d - 2005-01-31 09:21:47 -0500 4974 4975 make zic complain about links to links if the -v flag is used 4976 4977 have "make public" do more code checking 4978 4979 add an include to "localtime.c" for the benefit of gcc systems 4980 4981 4982 Release 2005c - 2005-01-17 18:36:29 -0500 4983 4984 get better results when mktime runs on a system where time_t is double 4985 4986 changes to the data files (most importantly to Paraguay) 4987 4988 4989 Release 2005b - 2005-01-10 09:19:54 -0500 4990 4991 Get localtime and gmtime working on systems with exotic time_t types. 4992 4993 Update the leap second commentary in the "leapseconds" file. 4994 4995 4996 Release 2005a - 2005-01-01 13:13:44 -0500 4997 4998 [not summarized] 4999 5000 5001 Release code2004i - 2004-12-14 13:42:58 -0500 5002 5003 Deal with systems where time_t is unsigned. 5004 5005 5006 Release code2004h - 2004-12-07 11:40:18 -0500 5007 5008 64-bit-time_t changes 5009 5010 5011 Release 2004g - 2004-11-02 09:06:01 -0500 5012 5013 update to Cuba (taking effect this weekend) 5014 5015 other changes by Paul Eggert 5016 5017 correction of the spelling of Oslo 5018 5019 changed versions of difftime.c and private.h 5020 5021 5022 Release code2004f - 2004-10-21 10:25:22 -0400 5023 5024 Cope with wide-ranging tm_year values. 5025 5026 5027 Release 2004e - 2004-10-11 14:47:21 -0400 5028 5029 Brazil/Argentina/Israel changes by Paul Eggert 5030 5031 changes to tz-link.htm by Paul 5032 5033 one small fix to Makefile 5034 5035 5036 Release 2004d - 2004-09-22 08:27:29 -0400 5037 5038 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 5039 5040 5041 Release 2004c - 2004-08-11 12:06:26 -0400 5042 5043 asctime-related changes 5044 5045 (variants of) some of the documentation changes suggested by Paul Eggert 5046 5047 5048 Release 2004b - 2004-07-19 14:33:35 -0400 5049 5050 data changes by Paul Eggert - most importantly, updates for Argentina 5051 5052 5053 Release 2004a - 2004-05-27 12:00:47 -0400 5054 5055 changes by Paul Eggert 5056 5057 Handle DST transitions that occur at the end of a month in some 5058 years but at the start of the following month in other years. 5059 5060 Add a copy of the correspondence that's the basis for claims about 5061 DST in the Navajo Nation. 5062 5063 5064 Release 2003e - 2003-12-15 09:36:47 -0500 5065 5066 changes by Arthur David Olson (primarily code changes) 5067 5068 changes by Paul Eggert (primarily data changes) 5069 5070 minor changes to "Makefile" and "northamerica" (in the latter case, 5071 optimization of the "Toronto" rules) 5072 5073 5074 Release 2003d - 2003-10-06 09:34:44 -0400 5075 5076 changes by Paul Eggert 5077 5078 5079 Release 2003c - 2003-09-16 10:47:05 -0400 5080 5081 Fix bad returns in zic.c's inleap function. 5082 Thanks to Bradley White for catching the problem! 5083 5084 5085 Release 2003b - 2003-09-16 07:13:44 -0400 5086 5087 Add a "--version" option (and documentation) to the zic and zdump commands. 5088 5089 changes to overflow/underflow checking in zic 5090 5091 a localtime typo fix. 5092 5093 Update the leapseconds and tz-art.htm files. 5094 5095 5096 Release 2003a - 2003-03-24 09:30:54 -0500 5097 5098 changes by Paul Eggert 5099 5100 a few additions and modifications to the tz-art.htm file 5101 5102 5103 Release 2002d - 2002-10-15 13:12:42 -0400 5104 5105 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 5106 5107 There's also a new time zone quote in "tz-art.htm". 5108 5109 5110 Release 2002c - 2002-04-04 11:55:20 -0500 5111 5112 changes by Paul Eggert 5113 5114 Change zic.c to avoid creating symlinks to files that don't exist. 5115 5116 5117 Release 2002b - 2002-01-28 12:56:03 -0500 5118 5119 [These change notes are for Release 2002a, which was corrupted. 5120 2002b was a corrected version of 2002a.] 5121 5122 changes by Paul Eggert 5123 5124 Update the "leapseconds" file to note that there'll be no leap 5125 second at the end of June, 2002. 5126 5127 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 5128 5129 Change to "difftime.c" to avoid sizeof problems. 5130 5131 5132 Release 2001d - 2001-10-09 13:31:32 -0400 5133 5134 changes by Paul Eggert 5135 5136 5137 Release 2001c - 2001-06-05 13:59:55 -0400 5138 5139 changes by Paul Eggert and Andrew Brown 5140 5141 5142 Release 2001b - 2001-04-05 16:44:38 -0400 5143 5144 changes by Paul Eggert (modulo jnorgard's typo fix) 5145 5146 tz-art.htm has been HTMLified. 5147 5148 5149 Release 2001a - 2001-03-13 12:57:44 -0500 5150 5151 changes by Paul Eggert 5152 5153 An addition to the "leapseconds" file: comments with the text of the 5154 latest IERS leap second notice. 5155 5156 Trailing white space has been removed from data file lines, and 5157 repeated spaces in "Rule Jordan" lines in the "asia" file have been 5158 converted to tabs. 5159 5160 5161 Release 2000h - 2000-12-14 15:33:38 -0500 5162 5163 changes by Paul Eggert 5164 5165 one typo fix in the "art" file 5166 5167 With providence, this is the last update of the millennium. 5168 5169 5170 Release 2000g - 2000-10-10 11:35:22 -0400 5171 5172 changes by Paul Eggert 5173 5174 correction of John Mackin's name submitted by Robert Elz 5175 5176 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 5177 Emmy Awards broadcast. 5178 5179 5180 Release 2000f - 2000-08-10 09:31:58 -0400 5181 5182 changes by Paul Eggert 5183 5184 Added information in "tz-art.htm" on a Seinfeld reference to DST. 5185 5186 Error checking and messages in the "yearistype" script have been 5187 improved. 5188 5189 5190 Release 2000e - 2000-07-31 09:27:54 -0400 5191 5192 data changes by Paul Eggert 5193 5194 a change to the default value of the defined constant HAVE_STRERROR 5195 5196 the addition of a Dave Barry quote on DST to the tz-arts file 5197 5198 5199 Release 2000d - 2000-04-20 15:43:04 -0400 5200 5201 changes to the documentation and code of strftime for C99 conformance 5202 5203 a bug fix for date.c 5204 5205 These are based on (though modified from) changes by Paul Eggert. 5206 5207 5208 Release 2000c - 2000-03-04 10:31:43 -0500 5209 5210 changes by Paul Eggert 5211 5212 5213 Release 2000b - 2000-02-21 12:16:29 -0500 5214 5215 changes by Paul Eggert and Joseph Myers 5216 5217 modest tweaks to the tz-art.htm and tz-link.htm files 5218 5219 5220 Release 2000a - 2000-01-18 09:21:26 -0500 5221 5222 changes by Paul Eggert 5223 5224 The two hypertext documents have also been renamed. 5225 5226 5227 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 5228 5229 Paul Eggert's changes 5230 5231 additions to the "zic" manual page and the "Arts.htm" file 5232 5233 5234 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 5235 5236 [not summarized] 5237 5238 5239 Release data1999h - 1999-10-07 03:50:29 -0400 5240 5241 changes by Paul Eggert to "europe" (most importantly, fixing 5242 Lithuania and Estonia) 5243 5244 5245 Release 1999g - 1999-09-28 11:06:18 -0400 5246 5247 data changes by Paul Eggert (most importantly, the change for 5248 Lebanon that buys correctness for this coming Sunday) 5249 5250 The "code" file contains changes to "Makefile" and "checktab.awk" to 5251 allow better checking of time zone files before they are published. 5252 5253 5254 Release 1999f - 1999-09-23 09:48:14 -0400 5255 5256 changes by Arthur David Olson and Paul Eggert 5257 5258 5259 Release 1999e - 1999-08-17 15:20:54 -0400 5260 5261 changes circulated by Paul Eggert, although the change to handling 5262 of DST-specifying timezone names has been commented out for now 5263 (search for "XXX" in "localtime.c" for details). These files also 5264 do not make any changes to the start of DST in Brazil. 5265 5266 In addition to Paul's changes, there are updates to "Arts.htm" and 5267 cleanups of URLs. 5268 5269 5270 Release 1999d - 1999-03-30 11:31:07 -0500 5271 5272 changes by Paul Eggert 5273 5274 The Makefile's "make public" rule has also been changed to do a test 5275 compile of each individual time zone data file (which should help 5276 avoid problems such as the one we had with Nicosia). 5277 5278 5279 Release 1999c - 1999-03-25 09:47:47 -0500 5280 5281 changes by Paul Eggert, most importantly the change for Chile. 5282 5283 5284 Release 1999b - 1999-02-01 17:51:44 -0500 5285 5286 changes by Paul Eggert 5287 5288 code changes (suggested by Mani Varadarajan, mani at be.com) for 5289 correct handling of symbolic links when building using a relative directory 5290 5291 code changes to generate correct messages for failed links 5292 5293 updates to the URLs in Arts.htm 5294 5295 5296 Release 1999a - 1999-01-19 16:20:29 -0500 5297 5298 error message internationalizations and corrections in zic.c and 5299 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 5300 to whom thanks!) 5301 5302 5303 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 5304 5305 changes for Brazil, Chile, and Germany 5306 5307 support for use of "24:00" in the input files for the time zone compiler 5308 5309 5310 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 5311 5312 changes by Paul Eggert 5313 5314 correction to a define in the "private.h" file 5315 5316 5317 Release data1998g - 1998-08-11 03:28:35 -0000 5318 [tzdata1998g.tar.gz is missing!] 5319 5320 Lithuanian change provided by mgedmin at pub.osf.it 5321 5322 Move creation of the GMT link with Etc/GMT to "etcetera" (from 5323 "backward") to ensure that the GMT file is created even where folks 5324 don't want the "backward" links (as suggested by Paul Eggert). 5325 5326 5327 Release data1998f - 1998-07-20 13:50:00 -0000 5328 [tzdata1998f.tar.gz is missing!] 5329 5330 Update the "leapseconds" file to include the newly-announced 5331 insertion at the end of 1998. 5332 5333 5334 Release code1998f - 1998-06-01 10:18:31 -0400 5335 5336 addition to localtime.c by Guy Harris 5337 5338 5339 Release 1998e - 1998-05-28 09:56:26 -0400 5340 5341 The Makefile is changed to produce zoneinfo-posix rather than 5342 zoneinfo/posix, and to produce zoneinfo-leaps rather than 5343 zoneinfo/right. 5344 5345 data changes by Paul Eggert 5346 5347 changes from Guy Harris to provide asctime_r and ctime_r 5348 5349 A usno1998 file (substantially identical to usno1997) has been added. 5350 5351 5352 Release 1998d - 1998-05-14 11:58:34 -0400 5353 5354 changes to comments (in particular, elimination of references to CIA maps). 5355 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 5356 where changes occur. 5357 5358 5359 Release 1998c - 1998-02-28 12:32:26 -0500 5360 5361 changes by Paul Eggert (save the "French correction," on which I'll 5362 wait for the dust to settle) 5363 5364 symlink changes 5365 5366 changes and additions to Arts.htm 5367 5368 5369 Release 1998b - 1998-01-17 14:31:51 -0500 5370 5371 URL cleanups and additions 5372 5373 5374 Release 1998a - 1998-01-13 12:37:35 -0500 5375 5376 changes by Paul Eggert 5377 5378 5379 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 5380 5381 changes by Paul Eggert, with minor modifications from Arthur David 5382 Olson to make the files more browser friendly 5383 5384 5385 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 5386 5387 minor changes to put "TZif" at the start of each timezone information file 5388 5389 a rule has also been added to the Makefile so you can 5390 make zones 5391 to just recompile the zone information files (rather than doing a 5392 full "make install" with its other effects). 5393 5394 5395 Release data1997i - 1997-10-07 08:45:38 -0400 5396 5397 changes to Africa by Paul Eggert 5398 5399 5400 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 5401 5402 corrections for Uruguay (and other locations) 5403 5404 Arthur David Olson's simple-minded fix allowing mktime to both 5405 correctly handle leap seconds and correctly handle tm_sec values 5406 upon which arithmetic has been performed. 5407 5408 5409 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 5410 5411 Paul Eggert's updates 5412 5413 a small change to a function prototype; 5414 5415 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 5416 include information on Around the World in Eighty Days. 5417 5418 5419 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 5420 5421 fixes to zic's error handling 5422 5423 changes inspired by the item circulated on Slovenia 5424 5425 The description of Web resources has been HTMLified for browsing 5426 convenience. 5427 5428 A new piece of tz-related music has been added to the "Music" file. 5429 5430 5431 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 5432 5433 Paul Eggert's latest suggestions 5434 5435 5436 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 5437 5438 changes to "zic.c" to correct performance of the "-s" option 5439 5440 a new file "usno1997" 5441 5442 5443 Release data1997c - 1997-03-04 09:58:18 -0500 5444 5445 changes in Israel 5446 5447 5448 Release 1997b - 1997-02-27 18:34:19 -0500 5449 5450 The data file incorporates the 1997 leap second. 5451 5452 The code file incorporates Arthur David Olson's take on the 5453 zic/multiprocessor/directory-creation situation. 5454 5455 5456 Release 1997a - 1997-01-21 09:11:10 -0500 5457 5458 Paul Eggert's Antarctica (and other changes) 5459 5460 Arthur David Olson finessed the "getopt" issue by checking against 5461 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 5462 is returned while SunOS 5.5's manual says EOF is returned). 5463 5464 5465 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 5466 5467 Paul Eggert's latest changes 5468 5469 5470 Release code1996n - 1996-12-16 09:42:02 -0500 5471 5472 link snapping fix from Bruce Evans (via Garrett Wollman) 5473 5474 5475 Release data1996m - 1996-11-24 02:37:34 -0000 5476 [tzdata1996m.tar.gz is missing!] 5477 5478 Paul Eggert's batch of changes 5479 5480 5481 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 5482 5483 No functional changes here; the files have simply been changed to 5484 make more use of ISO style dates in comments. The names of the above 5485 files now include the year in full. 5486 5487 5488 Release code96l - 1996-09-08 17:12:20 -0400 5489 5490 tzcode96k was missing a couple of pieces. 5491 5492 5493 Release 96k - 1996-09-08 16:06:22 -0400 5494 5495 the latest round of changes from Paul Eggert 5496 5497 the recent Year 2000 material 5498 5499 5500 Release code96j - 1996-07-30 13:18:53 -0400 5501 5502 Set sp->typecnt as suggested by Timothy Patrick Murphy. 5503 5504 5505 Release code96i - 1996-07-27 20:11:35 -0400 5506 5507 Paul's suggested patch for strftime %V week numbers 5508 5509 5510 Release data96i - 1996-07-01 18:13:04 -0400 5511 5512 "northamerica" and "europe" changes by Paul Eggert 5513 5514 5515 Release code96h - 1996-06-05 08:02:21 -0400 5516 5517 fix for handling transitions specified in Universal Time 5518 5519 Some "public domain" notices have also been added. 5520 5521 5522 Release code96g - 1996-05-16 14:00:26 -0400 5523 5524 fix for the simultaneous-DST-and-zone-change challenge 5525 5526 5527 Release data96h - 1996-05-09 17:40:51 -0400 5528 5529 changes by Paul Eggert 5530 5531 5532 Release code96f-data96g - 1996-05-03 03:09:59 -0000 5533 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 5534 5535 The changes get us some of the way to fixing the problems noted in Paul 5536 Eggert's letter yesterday (in addition to a few others). The approach 5537 has been to make zic a bit smarter about figuring out what time zone 5538 abbreviations apply just after the time specified in the "UNTIL" part 5539 of a zone line. Putting the smarts in zic means avoiding having 5540 transition times show up in both "Zone" lines and "Rule" lines, which 5541 in turn avoids multiple transition time entries in time zone files. 5542 (This also makes the zic input files such as "europe" a bit shorter and 5543 should ease maintenance.) 5544 5545 5546 Release data96f - 1996-04-19 19:20:03 -0000 5547 [tzdata96f.tar.gz is missing!] 5548 5549 The only changes are to the "northamerica" file; the time zone 5550 abbreviation for Denver is corrected to MST (and MDT), and the 5551 comments for Mexico have been updated. 5552 5553 5554 Release data96e - 1996-03-19 17:37:26 -0500 5555 5556 Proposals by Paul Eggert, in particular the Portugal change that 5557 comes into play at the end of this month. 5558 5559 5560 Release data96d - 1996-03-18 20:49:39 -0500 5561 5562 [not summarized] 5563 5564 5565 Release code96e - 1996-02-29 15:43:27 -0000 5566 [tzcode96e.tar.gz is missing!] 5567 5568 internationalization changes and the fix to the documentation for strftime 5569 5570 5571 Release code96d-data96c - 1996-02-12 11:05:27 -0500 5572 5573 The "code" file simply updates Bob Kridle's electronic address. 5574 5575 The "data" file updates rules for Mexico. 5576 5577 5578 Release data96b - 1996-01-27 15:44:42 -0500 5579 5580 Kiribati change 5581 5582 5583 Release code96c - 1996-01-16 16:58:15 -0500 5584 5585 leap-year streamlining and binary-search changes 5586 5587 fix to newctime.3 5588 5589 5590 Release code96b - 1996-01-10 20:42:39 -0500 5591 5592 fixes and enhancements from Paul Eggert, including code that 5593 emulates the behavior of recent versions of the SunOS "date" 5594 command. 5595 5596 5597 Release 96a - 1996-01-06 09:08:24 -0500 5598 5599 Israel updates 5600 5601 fixes to strftime.c for correct ISO 8601 week number generation, 5602 plus support for two new formats ('G' and 'g') to give ISO 8601 year 5603 numbers (which are not necessarily the same as calendar year numbers) 5604 5605 5606 Release code95i-data95m - 1995-12-21 12:46:47 -0500 5607 5608 The latest revisions from Paul Eggert are included, the usno1995 5609 file has been updated, and a new file ("WWW") covering useful URLs 5610 has been added. 5611 5612 5613 Release code95h-data95l - 1995-12-19 18:10:12 -0500 5614 5615 A simplification of a macro definition, a change to data for Sudan, 5616 and (for last minute shoppers) notes in the "Music" file on the CD 5617 "Old Man Time". 5618 5619 5620 Release code95g-data95k - 1995-10-30 10:32:47 -0500 5621 5622 (slightly reformatted) 8-bit-clean proposed patch 5623 5624 minor patch: US/Eastern -> America/New_York 5625 5626 snapshot of the USNO's latest data ("usno1995") 5627 5628 some other minor cleanups 5629 5630 5631 Release code95f-data95j - 1995-10-28 21:01:34 -0000 5632 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 5633 5634 European cleanups 5635 5636 support for 64-bit time_t's 5637 5638 optimization in localtime.c 5639 5640 5641 Release code95e - 1995-10-13 13:23:57 -0400 5642 5643 the mktime change to scan from future to past when trying to find time zone 5644 offsets 5645 5646 5647 Release data95i - 1995-09-26 10:43:26 -0400 5648 5649 For Canada/Central, guess that the Sun customer's "one week too 5650 early" was just a approximation, and the true error is one month 5651 too early. This is consistent with the rest of Canada. 5652 5653 5654 Release data95h - 1995-09-21 11:26:48 -0400 5655 5656 latest changes from Paul Eggert 5657 5658 5659 Release code95d - 1995-09-14 11:14:45 -0400 5660 5661 the addition of a "Music" file, which documents four recorded 5662 versions of the tune "Save That Time". 5663 5664 5665 Release data95g - 1995-09-01 17:21:36 -0400 5666 5667 "yearistype" correction 5668 5669 5670 Release data95f - 1995-08-28 20:46:56 -0400 5671 5672 Paul Eggert's change to the australasia file 5673 5674 5675 Release data95e - 1995-07-08 18:02:34 -0400 5676 5677 The only change is a leap second at the end of this year. 5678 Thanks to Bradley White for forwarding news on the leap second. 5679 5680 5681 Release data95d - 1995-07-03 13:26:22 -0400 5682 5683 Paul Eggert's changes 5684 5685 5686 Release data95c - 1995-07-02 19:19:28 -0400 5687 5688 changes to "asia", "backward", "europe", and "southamerica" 5689 (read: northamericacentrics need not apply) 5690 5691 5692 Release code95c - 1995-03-13 14:00:46 -0500 5693 5694 one-line fix for sign extension problems in detzcode 5695 5696 5697 Release 95b - 1995-03-04 11:22:38 -0500 5698 5699 Minor changes in both: 5700 5701 The "code" file contains a workaround for the lack of "unistd.h" in 5702 Microsoft C++ version 7. 5703 5704 The "data" file contains a fixed "Link" for America/Shiprock. 5705 5706 5707 Release 94h - 1994-12-10 12:51:14 -0500 5708 5709 The files: 5710 5711 * incorporate the changes to "zdump" and "date" to make changes to 5712 the "TZ" environment variable permanent; 5713 5714 * incorporate the table changes by Paul Eggert; 5715 5716 * include (and document) support for universal time specifications in 5717 data files - but do not (yet) include use of this feature in the 5718 data files. 5719 5720 Think of this as "TZ Classic" - the software has been set up not to break if 5721 universal time shows up in its input, and data entries have been 5722 left as is so as not to break existing implementations. 5723 5724 5725 Release data94f - 1994-08-20 12:56:09 -0400 5726 5727 (with thanks!) the latest data updates from Paul Eggert 5728 5729 5730 Release data94e - 1994-06-04 13:13:53 -0400 5731 5732 [not summarized] 5733 5734 5735 Release code94g - 1994-05-05 12:14:07 -0400 5736 5737 fix missing "optind.c" and a reference to it in the Makefile 5738 5739 5740 Release code94f - 1994-05-05 13:00:33 -0000 5741 [tzcode94f.tar.gz is missing!] 5742 5743 changes to avoid overflow in difftime, as well as changes to cope 5744 with the 52/53 challenge in strftime 5745 5746 5747 Release code94e - 1994-03-30 23:32:59 -0500 5748 5749 change for the benefit of PCTS 5750 5751 5752 Release 94d - 1994-02-24 15:42:25 -0500 5753 5754 Avoid clashes with POSIX semantics for zones such as GMT+4. 5755 5756 Some other very minor housekeeping is also present. 5757 5758 5759 Release code94c - 1994-02-10 08:52:40 -0500 5760 5761 Fix bug where mkdirs was broken unless you compile with 5762 -fwritable-strings (which is generally losing to do). 5763 5764 5765 Release 94b - 1994-02-07 10:04:33 -0500 5766 5767 work by Paul Eggert who notes: 5768 5769 I found another book of time zone histories by E W Whitman; it's not 5770 as extensive as Shanks but has a few goodies of its own. I used it 5771 to update the tables. I also fixed some more as a result of 5772 correspondence with Adam David and Peter Ilieve, and move some stray 5773 links from 'europe' to 'backward'. I corrected some scanning errors 5774 in usno1989. 5775 5776 As far as the code goes, I fixed zic to allow years in the range 5777 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 5778 And I cleaned up the zic documentation a little bit. 5779 5780 5781 Release data94a - 1994-02-03 08:58:54 -0500 5782 5783 It simply incorporates the recently announced leap second into the 5784 "leapseconds" file. 5785 5786 5787 Release 93g - 1993-11-22 17:28:27 -0500 5788 5789 Paul Eggert has provided a good deal of historic information (based 5790 on Shanks), and there are some code changes to deal with the buglets 5791 that crawled out in dealing with the new information. 5792 5793 5794 Release 93f - 1993-10-15 12:27:46 -0400 5795 5796 Paul Eggert's changes 5797 5798 5799 Release 93e - 1993-09-05 21:21:44 -0400 5800 5801 This has updated data for Israel, England, and Kwajalein. There's 5802 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 5803 Thanks to Paul Eggert and Peter Ilieve for the changes. 5804 5805 5806 Release 93d - 1993-06-17 23:34:17 -0400 5807 5808 new fix and new data on Israel 5809 5810 5811 Release 93c - 1993-06-06 19:31:55 -0400 5812 5813 [not summarized] 5814 5815 5816 Release 93b - 1993-02-02 14:53:58 -0500 5817 5818 updated "leapseconds" file 5819 5820 5821 Release 93 - 1993-01-08 07:01:06 -0500 5822 5823 At kre's suggestion, the package has been split in two - a code piece 5824 (which also includes documentation) that's only of use to folks who 5825 want to recompile things and a data piece useful to anyone who can 5826 run "zic". 5827 5828 The new version has a few changes to the data files, a few 5829 portability changes, and an off-by-one fix (with thanks to 5830 Tom Karzes at deshaw.com for providing a description and a 5831 solution). 5832 5833 5834 Release 92c - 1992-11-21 17:35:36 -0000 5835 [tz92c.tar.Z is missing!] 5836 5837 The fallout from the latest round of DST transitions. 5838 5839 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 5840 there's also a change to "zic.c" that makes it portable to more systems. 5841 5842 5843 Release 92 - 1992-04-25 18:17:03 -0000 5844 [tz92.tar.Z is missing!] 5845 5846 By popular demand (well, at any rate, following a request by kre at munnari) 5847 5848 5849 The 1989 update of the time zone package featured: 5850 5851 * POSIXization (including interpretation of POSIX-style TZ environment 5852 variables, provided by Guy Harris), 5853 * ANSIfication (including versions of "mktime" and "difftime"), 5854 * SVIDulation (an "altzone" variable) 5855 * MACHination (the "gtime" function) 5856 * corrections to some time zone data (including corrections to the rules 5857 for Great Britain and New Zealand) 5858 * reference data from the United States Naval Observatory for folks who 5859 want to do additional time zones 5860 * and the 1989 data for Saudi Arabia. 5861 5862 (Since this code will be treated as "part of the implementation" in some 5863 places and as "part of the application" in others, there's no good way to 5864 name functions, such as timegm, that are not part of the proposed ANSI C 5865 standard; such functions have kept their old, underscore-free names in this 5866 update.) 5867 5868 And the "dysize" function has disappeared; it was present to allow 5869 compilation of the "date" command on old BSD systems, and a version of "date" 5870 is now provided in the package. The "date" command is not created when you 5871 "make all" since it may lack options provided by the version distributed with 5872 your operating system, or may not interact with the system in the same way 5873 the native version does. 5874 5875 Since POSIX frowns on correct leap second handling, the default behavior of 5876 the "zic" command (in the absence of a "-L" option) has been changed to omit 5877 leap second information from its output files. 5878 5879 5880 ----- 5881 Notes 5882 5883 This file contains copies of the part of each release announcement 5884 that talks about the changes in that release. The text has been 5885 adapted and reformatted for the purposes of this file. 5886 5887 Traditionally a release R consists of a pair of tarball files, 5888 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 5889 code2010a, data2012c) consist of just one or the other tarball, and a 5890 few (e.g., code2012c-data2012d) have tarballs with mixed version 5891 numbers. Recent releases also come in an experimental format 5892 consisting of a single tarball tzdb-R.tar.lz with extra data. 5893 5894 Release timestamps are taken from the release's commit (for newer, 5895 Git-based releases), from the newest file in the tarball (for older 5896 releases, where this info is available) or from the email announcing 5897 the release (if all else fails; these are marked with a time zone 5898 abbreviation of -0000 and an "is missing!" comment). 5899 5900 Earlier versions of the code and data were not announced on the tz 5901 list and are not summarized here. 5902 5903 This file is in the public domain. 5904 5905 Local Variables: 5906 coding: utf-8 5907 End: 5908
Indexes created Sun Sep 28 12:09:53 GMT 2025