NEWS revision 1.40
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 89 Release 2022f - 2022-10-28 18:04:57 -0700 90 91 Briefly: 92 Mexico will no longer observe DST except near the US border. 93 Chihuahua moves to year-round -06 on 2022-10-30. 94 Fiji no longer observes DST. 95 Move links to 'backward'. 96 In vanguard form, GMT is now a Zone and Etc/GMT a link. 97 zic now supports links to links, and vanguard form uses this. 98 Simplify four Ontario zones. 99 Fix a Y2438 bug when reading TZif data. 100 Enable 64-bit time_t on 32-bit glibc platforms. 101 Omit large-file support when no longer needed. 102 In C code, use some C23 features if available. 103 Remove no-longer-needed workaround for Qt bug 53071. 104 105 Changes to future timestamps 106 107 Mexico will no longer observe DST after 2022, except for areas 108 near the US border that continue to observe US DST rules. 109 On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves 110 from -07 (-06 with DST) to year-round -06, thus not changing 111 its clocks that day. The new law states that Chihuahua 112 near the US border no longer observes US DST. 113 (Thanks to gera for the heads-up about Chihuahua.) 114 115 Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.) 116 For now, assume DST is suspended indefinitely. 117 118 Changes to data 119 120 Move links to 'backward' to ease and simplify link maintenance. 121 This affects generated data only if you use 'make BACKWARD='. 122 123 GMT is now a Zone and Etc/GMT a link instead of vice versa, 124 as GMT is needed for leap second support whereas Etc/GMT is not. 125 However, this change exposes a bug in TZUpdater 2.3.2 so it is 126 present only in vanguard form for now. 127 128 Vanguard form now uses links to links, as zic now supports this. 129 130 Changes to past timestamps 131 132 Simplify four Ontario zones, as most of the post-1970 differences 133 seem to have been imaginary. (Problem reported by Chris Walton.) 134 Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay 135 to 'backzone'; backward-compatibility links still work, albeit 136 with some different timestamps before November 2005. 137 138 Changes to code 139 140 zic now supports links to links regardless of input line order. 141 For example, if Australia/Sydney is a Zone, the lines 142 Link Australia/Canberra Australia/ACT 143 Link Australia/Sydney Australia/Canberra 144 now work correctly, even though the shell commands 145 ln Australia/Canberra Australia/ACT 146 ln Australia/Sydney Australia/Canberra 147 would fail because the first command attempts to use a link 148 Australia/Canberra that does not exist until after the second 149 command is executed. Previously, zic had unspecified behavior if 150 a Link line's target was another link, and zic often misbehaved if 151 a Link line's target was a later Link line. 152 153 Fix line number in zic's diagnostic for a link to a link. 154 155 Fix a bug that caused localtime to mishandle timestamps starting 156 in the year 2438 when reading data generated by 'zic -b fat' when 157 distant-future DST transitions occur at times given in standard 158 time or in UT, not the usual case of local time. This occurs when 159 the corresponding .zi Rule lines specify DST transitions with TO 160 columns of 'max' and AT columns that end in 's' or 'u'. The 161 number 2438 comes from the 32-bit limit in the year 2038, plus the 162 400-year Gregorian cycle. (Problem reported by Bradley White.) 163 164 On glibc 2.34 and later, which optionally supports 64-bit time_t 165 on platforms like x86 where time_t was traditionally 32 bits, 166 default time_t to 64 instead of 32 bits. This lets functions like 167 localtime support timestamps after the year 2038, and fixes 168 year-2038 problems in zic when accessing files dated after 2038. 169 To continue to limit time_t to 32 bits on these platforms, use 170 "make CFLAGS='-D_TIME_BITS=32'". 171 172 In C code, do not enable large-file support on platforms like AIX 173 and macOS that no longer need it now that tzcode does not use 174 off_t or related functions like 'stat'. Large-file support is 175 still enabled by default on GNU/Linux, as it is needed for 64-bit 176 time_t support. 177 178 In C code, prefer C23 keywords to pre-C23 macros for alignof, 179 bool, false, and true. Also, use the following C23 features if 180 available: __has_include, unreachable. 181 182 zic no longer works around Qt bug 53071, as the relevant Qt 183 releases have been out of support since 2019. This change affects 184 only fat TZif files, as thin files never had the workaround. 185 186 zdump no longer modifies the environ vector when compiled on 187 platforms lacking tm_zone or when compiled with -DUSE_LTZ=0. 188 This avoid undefined behavior on POSIX platforms. 189 190 191 Release 2022e - 2022-10-11 11:13:02 -0700 192 193 Briefly: 194 Jordan and Syria switch from +02/+03 with DST to year-round +03. 195 196 Changes to future timestamps 197 198 Jordan and Syria are abandoning the DST regime and are changing to 199 permanent +03, so they will not fall back from +03 to +02 on 200 2022-10-28. (Thanks to Steffen Thorsen and Issam Al-Zuwairi.) 201 202 Changes to past timestamps 203 204 On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00. 205 206 Changes to past time zone abbreviations and DST flags 207 208 The temporary advancement of clocks in central Mexico in summer 209 1931 is now treated as daylight saving time, instead of as two 210 changes to standard time. 211 212 213 Release 2022d - 2022-09-23 12:02:57 -0700 214 215 Briefly: 216 Palestine transitions are now Saturdays at 02:00. 217 Simplify three Ukraine zones into one. 218 219 Changes to future timestamps 220 221 Palestine now springs forward and falls back at 02:00 on the 222 first Saturday on or after March 24 and October 24, respectively. 223 This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00. 224 (Thanks to Heba Hamad.) 225 226 Changes to past timestamps 227 228 Simplify three Ukraine zones to one, since the post-1970 229 differences seem to have been imaginary. Move Europe/Uzhgorod and 230 Europe/Zaporozhye to 'backzone'; backward-compatibility links 231 still work, albeit with different timestamps before October 1991. 232 233 234 Release 2022c - 2022-08-15 17:47:18 -0700 235 236 Briefly: 237 Work around awk bug in FreeBSD, macOS, etc. 238 Improve tzselect on intercontinental Zones. 239 240 Changes to code 241 242 Work around a bug in onetrueawk that broke commands like 243 'make traditional_tarballs' on FreeBSD, macOS, etc. 244 (Problem reported by Deborah Goldsmith.) 245 246 Add code to tzselect that uses experimental structured comments in 247 zone1970.tab to clarify whether Zones like Africa/Abidjan and 248 Europe/Istanbul cross continent or ocean boundaries. 249 (Inspired by a problem reported by Peter Krefting.) 250 251 Fix bug with 'zic -d /a/b/c' when /a is unwritable but the 252 directory /a/b already exists. 253 254 Remove zoneinfo2tdf.pl, as it was unused and triggered false 255 malware alarms on some email servers. 256 257 258 Release 2022b - 2022-08-10 15:38:32 -0700 259 260 Briefly: 261 Chile's DST is delayed by a week in September 2022. 262 Iran no longer observes DST after 2022. 263 Rename Europe/Kiev to Europe/Kyiv. 264 New zic -R option 265 Vanguard form now uses %z. 266 Finish moving duplicate-since-1970 zones to 'backzone'. 267 New build option PACKRATLIST 268 New tailored_tarballs target, replacing rearguard_tarballs 269 270 Changes to future timestamps 271 272 Chile's 2022 DST start is delayed from September 4 to September 11. 273 (Thanks to Juan Correa.) 274 275 Iran plans to stop observing DST permanently, after it falls back 276 on 2022-09-21. (Thanks to Ali Mirjamali.) 277 278 Changes to past timestamps 279 280 Finish moving to 'backzone' the location-based zones whose 281 timestamps since 1970 are duplicates; adjust links accordingly. 282 This change ordinarily affects only pre-1970 timestamps, and with 283 the new PACKRATLIST option it does not affect any timestamps. 284 In this round the affected zones are Antarctica/Vostok, 285 Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, 286 Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, 287 Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, 288 Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, 289 Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, 290 Pacific/Wake and Pacific/Wallis, and the affected links are 291 Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, 292 Pacific/Truk, and Pacific/Yap. 293 294 From fall 1994 through fall 1995, Shanks wrote that Crimea's 295 DST transitions were at 02:00 standard time, not at 00:00. 296 (Thanks to Michael Deckers.) 297 298 Iran adopted standard time in 1935, not 1946. In 1977 it observed 299 DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 300 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 301 transition was on 05-27, not 03-21. 302 (Thanks to Roozbeh Pournader and Francis Santoni.) 303 304 Chile's observance of -04 from 1946-08-29 through 1947-03-31 was 305 considered DST, not standard time. Santiago and environs had moved 306 their clocks back to rejoin the rest of mainland Chile; put this 307 change at the end of 1946-08-28. (Thanks to Michael Deckers.) 308 309 Some old, small clock transitions have been removed, as people at 310 the time did not change their clocks. This affects Asia/Hong_Kong 311 in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. 312 313 Changes to zone name 314 315 Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in 316 English now. Spelling of other names in Ukraine has not yet 317 demonstrably changed in common English practice so for now these 318 names retain old spellings, as in other countries (e.g., 319 Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). 320 321 Changes to code 322 323 zic has a new option '-R @N' to output explicit transitions < N. 324 (Need suggested by Almaz Mingaleev.) 325 326 'zic -r @N' no longer outputs bad data when N < first transition. 327 (Problem introduced in 2021d and reported by Peter Krefting.) 328 329 zic now checks its input for NUL bytes and unterminated lines, and 330 now supports input line lengths up to 2048 (not 512) bytes. 331 332 gmtime and related code now use the abbreviation "UTC" not "GMT". 333 POSIX is being revised to require this. 334 335 When tzset and related functions set vestigial static variables 336 like tzname, they now prefer specified timestamps to unspecified ones. 337 (Problem reported by Almaz Mingaleev.) 338 339 zic no longer complains "can't determine time zone abbreviation to 340 use just after until time" when a transition to a new standard 341 time occurs simultaneously with the first DST fallback transition. 342 343 Changes to build procedure 344 345 Source data in vanguard form now uses the %z notation, introduced 346 in release 2015f. For example, for America/Sao_Paulo vanguard 347 form contains the zone continuation line "-3:00 Brazil %z", which 348 is simpler and more reliable than the line "-3:00 Brazil -03/-02" 349 used in main and rearguard forms. The plan is for the main form 350 to use %z eventually; in the meantime maintainers of zi parsers 351 are encouraged to test the parsers on vanguard.zi. 352 353 The Makefile has a new PACKRATLIST option to select a subset of 354 'backzone'. For example, 'make PACKRATDATA=backzone 355 PACKRATLIST=zone.tab' now generates TZif files identical to those 356 of the global-tz project. 357 358 The Makefile has a new tailored_tarballs target for generating 359 special-purpose tarballs. It generalizes and replaces the 360 rearguard_tarballs target and related targets and macros, which 361 are now obsolescent. 362 363 'make install' now defaults LOCALTIME to Factory not GMT, 364 which means the default abbreviation is now "-00" not "GMT". 365 366 Remove the posix_packrat target, marked obsolescent in 2016a. 367 368 369 Release 2022a - 2022-03-15 23:02:01 -0700 370 371 Briefly: 372 Palestine will spring forward on 2022-03-27, not -03-26. 373 zdump -v now outputs better failure indications. 374 Bug fixes for code that reads corrupted TZif data. 375 376 Changes to future timestamps 377 378 Palestine will spring forward on 2022-03-27, not 2022-03-26. 379 (Thanks to Heba Hamad.) Predict future transitions for first 380 Sunday >= March 25. Additionally, predict fallbacks to be the first 381 Friday on or after October 23, not October's last Friday, to be more 382 consistent with recent practice. The first differing fallback 383 prediction is on 2025-10-24, not 2025-10-31. 384 385 Changes to past timestamps 386 387 From 1992 through spring 1996, Ukraine's DST transitions were at 388 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) 389 390 Chile's Santiago Mean Time and its LMT precursor have been adjusted 391 eastward by 1 second to align with past and present law. 392 393 Changes to commentary 394 395 Add several references for Chile's 1946/1947 transitions, some of 396 which only affected portions of the country. 397 398 Changes to code 399 400 Fix bug when mktime gets confused by truncated TZif files with 401 unspecified local time. (Problem reported by Almaz Mingaleev.) 402 403 Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. 404 (Problem reported by Christos Zoulas.) 405 406 When reading a version 2 or later TZif file, the TZif reader now 407 validates the version 1 header and data block only enough to skip 408 over them, as recommended by RFC 8536 section 4. Also, the TZif 409 reader no longer mistakenly attempts to parse a version 1 TZIf 410 file header as a TZ string. 411 412 zdump -v now outputs "(localtime failed)" and "(gmtime failed)" 413 when local time and UT cannot be determined for a timestamp. 414 415 Changes to build procedure 416 417 Distribution tarballs now use standard POSIX.1-1988 ustar format 418 instead of GNU format. Although the formats are almost identical 419 for these tarballs, ustar headers' magic fields contain "ustar" 420 instead of "ustar ", and their version fields contain "00" instead 421 of " ". The two formats are planned to diverge more significantly 422 for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar 423 format becomes obsolete and the tarballs switch to pax format, an 424 extension of ustar. For details about these formats, please see 425 "pax - portable archive interchange", IEEE Std 1003.1-2017, 426 <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>. 427 428 429 Release 2021e - 2021-10-21 18:41:00 -0700 430 431 Changes to future timestamps 432 433 Palestine will fall back 10-29 (not 10-30) at 01:00. 434 (Thanks to P Chan and Heba Hemad.) 435 436 437 Release 2021d - 2021-10-15 13:48:18 -0700 438 439 Briefly: 440 Fiji suspends DST for the 2021/2022 season. 441 'zic -r' marks unspecified timestamps with "-00". 442 443 Changes to future timestamps 444 445 Fiji will suspend observance of DST for the 2021/2022 season. 446 Assume for now that it will return next year. (Thanks to Jashneel 447 Kumar and P Chan.) 448 449 Changes to code 450 451 'zic -r' now uses "-00" time zone abbreviations for intervals 452 with UT offsets that are unspecified due to -r truncation. 453 This implements a change in draft Internet RFC 8536bis. 454 455 456 Release 2021c - 2021-10-01 14:21:49 -0700 457 458 Briefly: 459 Revert most 2021b changes to 'backward'. 460 Fix 'zic -b fat' bug in pre-1970 32-bit data. 461 Fix two Link line typos. 462 Distribute SECURITY file. 463 464 This release is intended as a bugfix release, to fix compatibility 465 problems and typos reported since 2021b was released. 466 467 Changes to Link directives 468 469 Revert almost all of 2021b's changes to the 'backward' file, 470 by moving Link directives back to where they were in 2021a. 471 Although 'zic' doesn't care which source file contains a Link 472 directive, some downstream uses ran into trouble with the move. 473 (Problem reported by Stephen Colebourne for Joda-Time.) 474 475 Fix typo that linked Atlantic/Jan_Mayen to the wrong location 476 (problem reported by Chris Walton). 477 478 Fix 'backzone' typo that linked America/Virgin to the wrong 479 location (problem reported by Michael Deckers). 480 481 Changes to code 482 483 Fix a bug in 'zic -b fat' that caused old timestamps to be 484 mishandled in 32-bit-only readers (problem reported by Daniel 485 Fischer). 486 487 Changes to documentation 488 489 Distribute the SECURITY file (problem reported by Andreas Radke). 490 491 492 Release 2021b - 2021-09-24 16:23:00 -0700 493 494 Briefly: 495 Jordan now starts DST on February's last Thursday. 496 Samoa no longer observes DST. 497 Merge more location-based Zones whose timestamps agree since 1970. 498 Move some backward-compatibility links to 'backward'. 499 Rename Pacific/Enderbury to Pacific/Kanton. 500 Correct many pre-1993 transitions in Malawi, Portugal, etc. 501 zic now creates each output file or link atomically. 502 zic -L no longer omits the POSIX TZ string in its output. 503 zic fixes for truncation and leap second table expiration. 504 zic now follows POSIX for TZ strings using all-year DST. 505 Fix some localtime crashes and bugs in obscure cases. 506 zdump -v now outputs more-useful boundary cases. 507 tzfile.5 better matches a draft successor to RFC 8536. 508 A new file SECURITY. 509 510 This release is prompted by recent announcements by Jordan and Samoa. 511 It incorporates many other changes that had accumulated since 2021a. 512 However, it omits most proposed changes that merged all Zones 513 agreeing since 1970, as concerns were raised about doing too many of 514 these changes at once. It does keeps some of these changes in the 515 interest of making tzdb more equitable one step at a time; see 516 "Merge more location-based Zones" below. 517 518 Changes to future timestamps 519 520 Jordan now starts DST on February's last Thursday. 521 (Thanks to Steffen Thorsen.) 522 523 Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) 524 525 Changes to zone name 526 527 Rename Pacific/Enderbury to Pacific/Kanton. When we added 528 Enderbury in 1993, we did not know that it is uninhabited and that 529 Kanton (population two dozen) is the only inhabited location in 530 that timezone. The old name is now a backward-compatibility link. 531 532 Changes to past timestamps 533 534 Correct many pre-1993 transitions, fixing entries originally 535 derived from Shanks, Whitman, and Mundell. The fixes include: 536 - Barbados: standard time was introduced in 1911, not 1932; and 537 DST was observed in 1942-1944 538 - Cook Islands: In 1899 they switched from east to west of GMT, 539 celebrating Christmas for two days. They (and Niue) switched 540 to standard time in 1952, not 1901. 541 - Guyana: corrected LMT for Georgetown; the introduction of 542 standard time in 1911, not 1915; and corrections to 1975 and 543 1992 transitions 544 - Kanton: uninhabited before 1937-08-31 545 - Niue: only observed -11:20 from 1952 through 1964, then went to 546 -11 instead of -11:30 547 - Portugal: DST was observed in 1950 548 - Tonga: corrected LMT; the introduction of standard time in 1945, 549 not 1901; and corrections to the transition from +12:20 to +13 550 in 1961, not 1941 551 Additional fixes to entries in the 'backzone' file include: 552 - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 553 - The Gambia: 1933 and 1942 transitions 554 - Malawi: several 1911 through 1925 transitions 555 - Sierra Leone: several 1913 through 1941 transitions, and DST 556 was NOT observed in 1957 through 1962 557 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and 558 Alois Treindl.) 559 560 Merge more location-based Zones whose timestamps agree since 1970, 561 as pre-1970 timestamps are out of scope. This is part of a 562 process that has been ongoing since 2013. This does not affect 563 post-1970 timestamps, and timezone historians who build with 'make 564 PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. 565 When merging, keep the most-populous location's data, and move 566 data for other locations to 'backzone' with a backward 567 link in 'backward'. For example, move America/Creston data to 568 'backzone' with a link in 'backward' from America/Phoenix because 569 the two timezones' timestamps agree since 1970; this change 570 affects some pre-1968 timestamps in America/Creston because 571 Creston and Phoenix disagreed before 1968. The affected Zones 572 are Africa/Accra, America/Atikokan, America/Blanc-Sablon, 573 America/Creston, America/Curacao, America/Nassau, 574 America/Port_of_Spain, Antarctica/DumontDUrville, and 575 Antarctica/Syowa. 576 577 Changes to maintenance procedure 578 579 The new file SECURITY covers how to report security-related bugs. 580 581 Several backward-compatibility links have been moved to the 582 'backward' file. These links, which range from Africa/Addis_Ababa 583 to Pacific/Saipan, are only for compatibility with now-obsolete 584 guidelines suggesting an entry for every ISO 3166 code. 585 The intercontinental convenience links Asia/Istanbul and 586 Europe/Nicosia have also been moved to 'backward'. 587 588 Changes to code 589 590 zic now creates each output file or link atomically, 591 possibly by creating a temporary file and then renaming it. 592 This avoids races where a TZ setting would temporarily stop 593 working while zic was installing a replacement file or link. 594 595 zic -L no longer omits the POSIX TZ string in its output. 596 Starting with 2020a, zic -L truncated its output according to the 597 "Expires" directive or "#expires" comment in the leapseconds file. 598 The resulting TZif files omitted daylight saving transitions after 599 the leap second table expired, which led to far less-accurate 600 predictions of times after the expiry. Although future timestamps 601 cannot be converted accurately in the presence of leap seconds, it 602 is more accurate to convert near-future timestamps with a few 603 seconds error than with an hour error, so zic -L no longer 604 truncates output in this way. 605 606 Instead, when zic -L is given the "Expires" directive, it now 607 outputs the expiration by appending a no-change entry to the leap 608 second table. Although this should work well with most TZif 609 readers, it does not conform to Internet RFC 8536 and some pickier 610 clients (including tzdb 2017c through 2021a) reject it, so 611 "Expires" directives are currently disabled by default. To enable 612 them, set the EXPIRES_LINE Makefile variable. If a TZif file uses 613 this new feature it is marked with a new TZif version number 4, 614 a format intended to be documented in a successor to RFC 8536. 615 616 zic -L LEAPFILE -r @LO no longer generates an invalid TZif file 617 that omits leap second information for the range LO..B when LO 618 falls between two leap seconds A and B. Instead, it generates a 619 TZif version 4 file that represents the previously-missing 620 information. 621 622 The TZif reader now allows the leap second table to begin with a 623 correction other than -1 or +1, and to contain adjacent 624 transitions with equal corrections. This supports TZif version 4. 625 626 The TZif reader now lets leap seconds occur less than 28 days 627 apart. This supports possible future TZif extensions. 628 629 Fix bug that caused 'localtime' etc. to crash when TZ was 630 set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does 631 not conform to POSIX but does conform to Internet RFC 8536. 632 633 Fix another bug that caused 'localtime' etc. to crash when TZ was 634 set to a POSIX-conforming but unusual TZ string like 635 "EST5EDT4,0/0,J365/0", where almost all the year is DST. 636 637 Fix yet another bug that caused 'localtime' etc. to mishandle slim 638 TZif files containing leap seconds after the last explicit 639 transition in the table, or when handling far-future timestamps 640 in slim TZif files lacking leap seconds. 641 642 Fix localtime misbehavior involving positive leap seconds. 643 This change affects only behavior for "right" system time, 644 which contains leap seconds, and only if the UT offset is 645 not a multiple of 60 seconds when a positive leap second occurs. 646 (No such timezone exists in tzdb, luckily.) Without the fix, 647 the timestamp was ambiguous during a positive leap second. 648 With the fix, any seconds occurring after a positive leap second 649 and within the same localtime minute are counted through 60, not 650 through 59; their UT offset (tm_gmtoff) is the same as before. 651 Here is how the fix affects timestamps in a timezone with UT 652 offset +01:23:45 (5025 seconds) and with a positive leap second at 653 1972-06-30 23:59:60 UTC (78796800): 654 655 time_t without the fix with the fix 656 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 657 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 658 ... 659 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 660 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 661 662 Fix an unlikely bug that caused 'localtime' etc. to misbehave if 663 civil time changes a few seconds before time_t wraps around, when 664 leap seconds are enabled. 665 666 Fix bug in zic -r; in some cases, the dummy time type after the 667 last time transition disagreed with the TZ string, contrary to 668 Internet RFC 8563 section 3.3. 669 670 Fix a bug with 'zic -r @X' when X is a negative leap second that 671 has a nonnegative correction. Without the fix, the output file 672 was truncated so that X appeared to be a positive leap second. 673 Fix a similar, even-less-likely bug when truncating at a positive 674 leap second that has a nonpositive correction. 675 676 zic -r now reports an error if given rolling leap seconds, as this 677 usage has never generally worked and is evidently unused. 678 679 zic now generates a POSIX-conforming TZ string for TZif files 680 where all-year DST is predicted for the indefinite future. 681 For example, for all-year Eastern Daylight Time, zic now generates 682 "XXX3EDT4,0/0,J365/23" where it previously generated 683 "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for 684 noting the possibility of POSIX conformance.) 685 686 zic.c no longer requires sys/wait.h (thanks to spazmodius for 687 noting it wasn't needed). 688 689 When reading slim TZif files, zdump no longer mishandles leap 690 seconds on the rare platforms where time_t counts leap seconds, 691 fixing a bug introduced in 2014g. 692 693 zdump -v now outputs timestamps at boundaries of what localtime 694 and gmtime can represent, instead of the less-useful timestamps 695 one day after the minimum and one day before the maximum. 696 (Thanks to Arthur David Olson for prototype code, and to Manuela 697 Friedrich for debugging help.) 698 699 zdump's -c and -t options are now consistently inclusive for the 700 lower time bound and exclusive for the upper. Formerly they were 701 inconsistent. (Confusion noted by Martin Burnicki.) 702 703 Changes to build procedure 704 705 You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to 706 non-POSIX hosts where malloc doesn't set errno. 707 (Problem reported by Jan Engelhardt.) 708 709 Changes to documentation 710 711 tzfile.5 better matches a draft successor to RFC 8536 712 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>. 713 714 715 Release 2021a - 2021-01-24 10:54:57 -0800 716 717 Changes to future timestamps 718 719 South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. 720 (Thanks to Steffen Thorsen.) 721 722 723 Release 2020f - 2020-12-29 00:17:46 -0800 724 725 Change to build procedure 726 727 'make rearguard_tarballs' no longer generates a bad rearguard.zi, 728 fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) 729 730 731 Release 2020e - 2020-12-22 15:14:34 -0800 732 733 Briefly: 734 Volgograd switches to Moscow time on 2020-12-27 at 02:00. 735 736 Changes to future timestamps 737 738 Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. 739 (Thanks to Alexander Krivenyshev and Stepan Golosunov.) 740 741 Changes to past timestamps 742 743 Correct many pre-1986 transitions, fixing entries originally 744 derived from Shanks. The fixes include: 745 - Australia: several 1917 through 1971 transitions 746 - The Bahamas: several 1941 through 1945 transitions 747 - Bermuda: several 1917 through 1956 transitions 748 - Belize: several 1942 through 1968 transitions 749 - Ghana: several 1915 through 1956 transitions 750 - Israel and Palestine: several 1940 through 1985 transitions 751 - Kenya and adjacent: several 1908 through 1960 transitions 752 - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 753 through 1919 transitions 754 - Seychelles: the introduction of standard time in 1907, not 1906 755 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition 756 (Thanks to P Chan.) 757 758 Because of the Australia change, Australia/Currie (King Island) is 759 no longer needed, as it is identical to Australia/Hobart for all 760 timestamps since 1970 and was therefore created by mistake. 761 Australia/Currie has been moved to the 'backward' file and its 762 corrected data moved to the 'backzone' file. 763 764 Changes to past time zone abbreviations and DST flags 765 766 To better match legislation in Turks and Caicos, the 2015 shift to 767 year-round observance of -04 is now modeled as AST throughout before 768 returning to Eastern Time with US DST in 2018, rather than as 769 maintaining EDT until 2015-11-01. (Thanks to P Chan.) 770 771 Changes to documentation 772 773 The zic man page now documents zic's coalescing of transitions 774 when a zone falls back just before DST springs forward. 775 776 777 Release 2020d - 2020-10-21 11:24:13 -0700 778 779 Briefly: 780 Palestine ends DST earlier than predicted, on 2020-10-24. 781 782 Changes to past and future timestamps 783 784 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 785 as previously predicted (thanks to Sharef Mustafa.) Its 786 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen 787 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and 788 its spring 2020 transition was on March 28 at 00:00, not March 27 789 (thanks to Pierre Cashon.) This affects Asia/Gaza and 790 Asia/Hebron. Assume future spring and fall transitions will be on 791 the Saturday preceding the last Sunday of March and October, 792 respectively. 793 794 795 Release 2020c - 2020-10-16 11:15:53 -0700 796 797 Briefly: 798 Fiji starts DST later than usual, on 2020-12-20. 799 800 Changes to future timestamps 801 802 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as 803 previously predicted. DST will still end on 2021-01-17. 804 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that 805 the later-than-usual start date is a one-time departure from the 806 recent pattern. 807 808 Changes to build procedure 809 810 Rearguard tarballs now contain an empty file pacificnew. 811 Some older downstream software expects this file to exist. 812 (Problem reported by Mike Cullinan.) 813 814 815 Release 2020b - 2020-10-06 18:35:04 -0700 816 817 Briefly: 818 Revised predictions for Morocco's changes starting in 2023. 819 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. 820 Macquarie Island has stayed in sync with Tasmania since 2011. 821 Casey, Antarctica is at +08 in winter and +11 in summer. 822 zic no longer supports -y, nor the TYPE field of Rules. 823 824 Changes to future timestamps 825 826 Morocco's spring-forward after Ramadan is now predicted to occur 827 no sooner than two days after Ramadan, instead of one day. 828 (Thanks to Milamber.) The first altered prediction is for 2023, 829 now predicted to spring-forward on April 30 instead of April 23. 830 831 Changes to past and future timestamps 832 833 Casey Station, Antarctica has been using +08 in winter and +11 in 834 summer since 2018. The most recent transition from +08 to +11 was 835 2020-10-04 00:01. Also, Macquarie Island has been staying in 836 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) 837 838 Changes to past and future time zone abbreviations and DST flags 839 840 Canada's Yukon, represented by America/Whitehorse and 841 America/Dawson, changes its time zone rules from -08/-07 to 842 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. 843 This change affects only the time zone abbreviation (MST vs PDT) 844 and daylight saving flag for the period between the two dates. 845 (Thanks to Andrew G. Smith.) 846 847 Changes to past timestamps 848 849 Correct several transitions for Hungary for 1918/1983. 850 For example, the 1983-09-25 fall-back was at 01:00, not 03:00. 851 (Thanks to Gza Nyry.) Also, the 1890 transition to standard 852 time was on 11-01, not 10-01 (thanks to Michael Deckers). 853 854 The 1891 French transition was on March 16, not March 15. The 855 1911-03-11 French transition was at midnight, not a minute later. 856 Monaco's transitions were on 1892-06-01 and 1911-03-29, not 857 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) 858 859 Changes to code 860 861 Support for zic's long-obsolete '-y YEARISTYPE' option has been 862 removed and, with it, so has support for the TYPE field in Rule 863 lines, which is now reserved for compatibility with earlier zic. 864 These features were previously deprecated in release 2015f. 865 (Thanks to Tim Parenti.) 866 867 zic now defaults to '-b slim' instead of to '-b fat'. 868 869 zic's new '-l -' and '-p -' options uninstall any existing 870 localtime and posixrules files, respectively. 871 872 The undocumented and ineffective tzsetwall function has been 873 removed. 874 875 Changes to build procedure 876 877 The Makefile now defaults POSIXRULES to '-', so the posixrules 878 feature (obsolete as of 2019b) is no longer installed by default. 879 880 Changes to documentation and commentary 881 882 The long-obsolete files pacificnew, systemv, and yearistype.sh have 883 been removed from the distribution. (Thanks to Tim Parenti.) 884 885 886 Release 2020a - 2020-04-23 16:03:47 -0700 887 888 Briefly: 889 Morocco springs forward on 2020-05-31, not 2020-05-24. 890 Canada's Yukon advanced to -07 year-round on 2020-03-08. 891 America/Nuuk renamed from America/Godthab. 892 zic now supports expiration dates for leap second lists. 893 894 Changes to future timestamps 895 896 Morocco's second spring-forward transition in 2020 will be May 31, 897 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) 898 Adjust future-year predictions to use the first Sunday after the 899 day after Ramadan, not the first Sunday after Ramadan. 900 901 Canada's Yukon, represented by America/Whitehorse and 902 America/Dawson, advanced to -07 year-round, beginning with its 903 spring-forward transition on 2020-03-08, and will not fall back on 904 2020-11-01. Although a government press release calls this 905 "permanent Pacific Daylight Saving Time", we prefer MST for 906 consistency with nearby Dawson Creek, Creston, and Fort Nelson. 907 (Thanks to Tim Parenti.) 908 909 Changes to past timestamps 910 911 Shanghai observed DST in 1919. (Thanks to Phake Nick.) 912 913 Changes to timezone identifiers 914 915 To reflect current usage in English better, America/Godthab has 916 been renamed to America/Nuuk. A backwards-compatibility link 917 remains for the old name. 918 919 Changes to code 920 921 localtime.c no longer mishandles timestamps after the last 922 transition in a TZif file with leap seconds and with daylight 923 saving time transitions projected into the indefinite future. 924 For example, with TZ='America/Los_Angeles' with leap seconds, 925 zdump formerly reported a DST transition on 2038-03-14 926 from 01:59:32.999... to 02:59:33 instead of the correct transition 927 from 01:59:59.999... to 03:00:00. 928 929 zic -L now supports an Expires line in the leapseconds file, and 930 truncates the TZif output accordingly. This propagates leap 931 second expiration information into the TZif file, and avoids the 932 abovementioned localtime.c bug as well as similar bugs present in 933 many client implementations. If no Expires line is present, zic 934 -L instead truncates the TZif output based on the #expires comment 935 present in leapseconds files distributed by tzdb 2018f and later; 936 however, this usage is obsolescent. For now, the distributed 937 leapseconds file has an Expires line that is commented out, so 938 that the file can be fed to older versions of zic which ignore the 939 commented-out line. Future tzdb distributions are planned to 940 contain a leapseconds file with an Expires line. 941 942 The configuration macros HAVE_TZNAME and USG_COMPAT should now be 943 set to 1 if the system library supports the feature, and 2 if not. 944 As before, these macros are nonzero if tzcode should support the 945 feature, zero otherwise. 946 947 The configuration macro ALTZONE now has the same values with the 948 same meaning as HAVE_TZNAME and USG_COMPAT. 949 950 The code's defense against CRLF in leap-seconds.list is now 951 portable to POSIX awk. (Problem reported by Deborah Goldsmith.) 952 953 Although the undocumented tzsetwall function is not changed in 954 this release, it is now deprecated in preparation for removal in 955 future releases. Due to POSIX requirements, tzsetwall has not 956 worked for some time. Any code that uses it should instead use 957 tzalloc(NULL) or, if portability trumps thread-safety, should 958 unset the TZ environment variable. 959 960 Changes to commentary 961 962 The les-de-la-Madeleine and the Listuguj reserve are noted as 963 following America/Halifax, and comments about Yukon's "south" and 964 "north" have been corrected to say "east" and "west". (Thanks to 965 Jeffery Nichols.) 966 967 968 Release 2019c - 2019-09-11 08:59:48 -0700 969 970 Briefly: 971 Fiji observes DST from 2019-11-10 to 2020-01-12. 972 Norfolk Island starts observing Australian-style DST. 973 974 Changes to future timestamps 975 976 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 977 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) 978 Adjust future guesses accordingly. 979 980 Norfolk Island will observe Australian-style DST starting in 981 spring 2019. The first transition is on 2019-10-06. (Thanks to 982 Kyle Czech and Michael Deckers.) 983 984 Changes to past timestamps 985 986 Many corrections to time in Turkey from 1940 through 1985. 987 (Thanks to Oya Vula via Alois Treindl, and to Kvan Yazan.) 988 989 The Norfolk Island 1975-03-02 transition was at 02:00 standard 990 time, not 02:00 DST. (Thanks to Michael Deckers.) 991 992 South Korea observed DST from 1948 through 1951. Although this 993 info was supposed to appear in release 2014j, a typo inadvertently 994 suppressed the change. (Thanks to Alois Treindl.) 995 996 Detroit observed DST in 1967 and 1968 following the US DST rules, 997 except that its 1967 DST began on June 14 at 00:01. (Thanks to 998 Alois Treindl for pointing out that the old data entries were 999 probably wrong.) 1000 1001 Fix several errors in pre-1970 transitions in Perry County, IN. 1002 (Thanks to Alois Treindl for pointing out the 1967/9 errors.) 1003 1004 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver 1005 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 1006 10-06. In 1945 Knigsberg (now Kaliningrad) switched from +01/+02 1007 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated 1008 EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 1009 Knigsberg switched to +03 on 04-07 not 01-01. 1010 1011 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 1012 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) 1013 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. 1014 1015 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. 1016 (Thanks to Michael Deckers.) 1017 1018 Changes to past time zone abbreviations and DST flags 1019 1020 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, 1021 is now flagged as DST and is abbreviated HKWT not HKT. 1022 1023 Changes to code 1024 1025 leapseconds.awk now relies only on its input data, rather than 1026 also relying on its comments. (Inspired by code from Dennis 1027 Ferguson and Chris Woodbury.) 1028 1029 The code now defends against CRLFs in leap-seconds.list. 1030 (Thanks to Brian Inglis and Chris Woodbury.) 1031 1032 Changes to documentation and commentary 1033 1034 theory.html discusses leap seconds. (Thanks to Steve Summit.) 1035 1036 Nashville's newspapers dueled about the time of day in the 1950s. 1037 (Thanks to John Seigenthaler.) 1038 1039 Liechtenstein observed Swiss DST in 1941/2. 1040 (Thanks to Alois Treindl.) 1041 1042 1043 Release 2019b - 2019-07-01 00:09:53 -0700 1044 1045 Briefly: 1046 Brazil no longer observes DST. 1047 'zic -b slim' outputs smaller TZif files; please try it out. 1048 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 1049 1050 Changes to future timestamps 1051 1052 Brazil has canceled DST and will stay on standard time indefinitely. 1053 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 1054 Oliveira.) 1055 1056 Predictions for Morocco now go through 2087 instead of 2037, to 1057 work around a problem on newlib when using TZif files output by 1058 zic 2019a or earlier. (Problem reported by David Gauchard.) 1059 1060 Changes to past and future timestamps 1061 1062 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 1063 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 1064 future transitions to be March's last Friday at 00:00. 1065 1066 Changes to past timestamps 1067 1068 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 1069 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 1070 not 09-15 at 00:00. In 1946 its spring-forward transition was on 1071 04-21 at 00:00, not the previous day at 03:30. From 1946 through 1072 1952 its fall-back transitions occurred at 04:30, not at 03:30. 1073 In 1947 its fall-back transition was on 11-30, not 12-30. 1074 (Thanks to P Chan.) 1075 1076 Changes to past time zone abbreviations 1077 1078 Italy's 1866 transition to Rome Mean Time was on December 12, not 1079 September 22. This affects only the time zone abbreviation for 1080 Europe/Rome between those dates. (Thanks to Stephen Trainor and 1081 Luigi Rosa.) 1082 1083 Changes affecting metadata only 1084 1085 Add info about the Crimea situation in zone1970.tab and zone.tab. 1086 (Problem reported by Serhii Demediuk.) 1087 1088 Changes to code 1089 1090 zic's new -b option supports a way to control data bloat and to 1091 test for year-2038 bugs in software that reads TZif files. 1092 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 1093 for example, changing from fat to slim shrinks the Europe/London 1094 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 1095 files represent the same set of timestamps and use the same TZif 1096 format as documented in tzfile(5) and in Internet RFC 8536. 1097 Fat format attempts to work around bugs or incompatibilities in 1098 older software, notably software that mishandles 64-bit TZif data 1099 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 1100 Slim format is more efficient and does not work around 64-bit bugs 1101 or obsolete TZ strings. Currently zic defaults to fat format 1102 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 1103 out-of-the-box default is intended to change in future releases 1104 as the buggy software often mishandles timestamps anyway. 1105 1106 zic no longer treats a set of rules ending in 2037 specially. 1107 Previously, zic assumed that such a ruleset meant that future 1108 timestamps could not be predicted, and therefore omitted a 1109 POSIX-like TZ string in the TZif output. The old behavior is no 1110 longer needed for current tzdata, and caused problems with newlib 1111 when used with older tzdata (reported by David Gauchard). 1112 1113 zic no longer generates some artifact transitions. For example, 1114 Europe/London no longer has a no-op transition in January 1996. 1115 1116 Changes to build procedure 1117 1118 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 1119 by a percent or so. 1120 1121 Changes to documentation and commentary 1122 1123 The Makefile now documents the POSIXRULES macro as being obsolete, 1124 and similarly, zic's -p POSIXRULES option is now documented as 1125 being obsolete. Although the POSIXRULES feature still exists and 1126 works as before, in practice it is rarely used for its intended 1127 purpose, and it does not work either in the default reference 1128 implementation (for timestamps after 2037) or in common 1129 implementations such as GNU/Linux (for contemporary timestamps). 1130 Since POSIXRULES was designed primarily as a temporary transition 1131 facility for System V platforms that died off decades ago, it is 1132 being decommissioned rather than institutionalized. 1133 1134 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 1135 1136 1137 Release 2019a - 2019-03-25 22:01:33 -0700 1138 1139 Briefly: 1140 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 1141 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 1142 1143 Changes to past and future timestamps 1144 1145 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 1146 previously predicted. Adjust our prediction by guessing that spring 1147 transitions will be between 24 and 30 March, which matches recent practice 1148 since 2016. (Thanks to Even Scharning and Tim Parenti.) 1149 1150 Metlakatla ended its observance of Pacific standard time, 1151 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 1152 Stanley and Tim Parenti.) 1153 1154 Changes to past timestamps 1155 1156 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 1157 (Thanks to Alois Treindl and Isaac Starkman.) 1158 1159 Changes to time zone abbreviations 1160 1161 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 1162 of being a separate zone that generates the abbreviation "UCT", 1163 which nowadays is typically a typo. (Problem reported by Isiah 1164 Meadows.) 1165 1166 Changes to code 1167 1168 zic now has an -r option to limit the time range of output data. 1169 For example, 'zic -r @1000000000' limits the output data to 1170 timestamps starting 1000000000 seconds after the Epoch. 1171 This helps shrink output size and can be useful for applications 1172 not needing the full timestamp history, such as TZDIST truncation; 1173 see Internet RFC 8536 section 5.1. (Inspired by a feature request 1174 from Christopher Wong, helped along by bug reports from Wong and 1175 from Tim Parenti.) 1176 1177 Changes to documentation 1178 1179 Mention Internet RFC 8536 (February 2019), which documents TZif. 1180 1181 tz-link.html now cites tzdata-meta 1182 <https://tzdata-meta.timtimeonline.com/>. 1183 1184 1185 Release 2018i - 2018-12-30 11:05:43 -0800 1186 1187 Briefly: 1188 So Tom and Prncipe switches from +01 to +00 on 2019-01-01. 1189 1190 Changes to future timestamps 1191 1192 Due to a change in government, So Tom and Prncipe switches back 1193 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 1194 Nasardinov and Michael Deckers.) 1195 1196 1197 Release 2018h - 2018-12-23 17:59:32 -0800 1198 1199 Briefly: 1200 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 1201 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 1202 Metlakatla, Alaska observes PST this winter only. 1203 Guess Morocco will continue to adjust clocks around Ramadan. 1204 Add predictions for Iran from 2038 through 2090. 1205 1206 Changes to future timestamps 1207 1208 Guess that Morocco will continue to fall back just before and 1209 spring forward just after Ramadan, the practice since 2012. 1210 (Thanks to Maamar Abdelkader.) This means Morocco will observe 1211 negative DST during Ramadan in main and vanguard formats, and in 1212 rearguard format it stays in the +00 timezone and observes 1213 ordinary DST in all months other than Ramadan. As before, extend 1214 this guesswork to the year 2037. As a consequence, Morocco is 1215 scheduled to observe three DST transitions in some Gregorian years 1216 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 1217 calendars. 1218 1219 The table of exact transitions for Iranian DST has been extended. 1220 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 1221 It now cuts off before 2091 as there is doubt about how the Persian 1222 calendar will treat 2091. This change predicts DST transitions in 1223 2038-9, 2042-3, and 2046-7 to occur one day later than previously 1224 predicted. As before, post-cutoff transitions are approximated. 1225 1226 Changes to past and future timestamps 1227 1228 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 1229 +05 on 2018-12-21. This is a zone split as Qostanay (aka 1230 Kostanay) did not switch, so create a zone Asia/Qostanay. 1231 1232 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 1233 It did not change clocks that day and remains on -08 this winter. 1234 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 1235 rules next spring, so this change affects only timestamps 1236 from 2018-11-04 through 2019-03-10. 1237 1238 Change to past timestamps 1239 1240 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 1241 not 00:00. I transcribed the time incorrectly from Shanks. 1242 (Thanks to Phake Nick.) 1243 1244 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 1245 (Thanks to Phake Nick.) 1246 1247 Guam observed DST irregularly from 1959 through 1977. 1248 (Thanks to Phake Nick.) 1249 1250 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 1251 10-01 changed standard time to +08:30 (not +08). Its transition 1252 back to +08 after WWII was on 1945-09-15, not the previous day. 1253 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 1254 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 1255 its 1952 fallback was on 11-02 (not 10-25). 1256 1257 This release contains many changes to timestamps before 1946 due 1258 to Japanese possession or occupation of Pacific/Chuuk, 1259 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 1260 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 1261 (Thanks to Phake Nick.) 1262 1263 Assume that the Spanish East Indies was like the Philippines and 1264 observed American time until the end of 1844. This affects 1265 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 1266 1267 Changes to past tm_isdst flags 1268 1269 For the recent Morocco change, the tm_isdst flag should be 1 from 1270 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 1271 Give a URL to the official decree. (Thanks to Matt Johnson.) 1272 1273 1274 Release 2018g - 2018-10-26 22:22:45 -0700 1275 1276 Briefly: 1277 Morocco switches to permanent +01 on 2018-10-28. 1278 1279 Changes to future timestamps 1280 1281 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 1282 so its clocks will not fall back as previously scheduled. 1283 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 1284 1285 Changes to code 1286 1287 When generating TZif files with leap seconds, zic no longer uses a 1288 format that trips up older 32-bit clients, fixing a bug introduced 1289 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 1290 for QTBUG-53071 now also works for TZif files with leap seconds. 1291 1292 The translator to rearguard format now rewrites the line 1293 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 1294 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 1295 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 1296 and earlier. (Reported by Christos Zoulas.) 1297 1298 Changes to past time zone abbreviations 1299 1300 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 1301 This reverts to 2011h, as the abbreviation change in 2011i was 1302 likely inadvertent. 1303 1304 Changes to documentation 1305 1306 tzfile.5 has new sections on interoperability issues. 1307 1308 1309 Release 2018f - 2018-10-18 00:14:18 -0700 1310 1311 Briefly: 1312 Volgograd moves from +03 to +04 on 2018-10-28. 1313 Fiji ends DST 2019-01-13, not 2019-01-20. 1314 Most of Chile changes DST dates, effective 2019-04-06. 1315 1316 Changes to future timestamps 1317 1318 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 1319 (Thanks to Alexander Fetisov and Stepan Golosunov.) 1320 1321 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 1322 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 1323 accordingly. 1324 1325 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 1326 time, and resume DST on the first Saturday in September at 24:00 mainland 1327 time. The changes are effective from 2019-04-06, and do not affect the 1328 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 1329 and Tim Parenti.) Adjust future predictions accordingly. 1330 1331 Changes to past timestamps 1332 1333 The 2018-05-05 North Korea 30-minute time zone change took place 1334 at 23:30 the previous day, not at 00:00 that day. 1335 1336 China's 1988 spring-forward transition was on April 17, not 1337 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 1338 (Thanks to P Chan.) 1339 1340 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 1341 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 1342 temporarily switched to +09/+10 during World War II. Macau 1343 observed DST in 1942/79, not 1961/80, and there were several 1344 errors for transition times and dates. (Thanks to P Chan.) 1345 1346 The 1948-1951 fallback transitions in Japan were at 25:00 on 1347 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 1348 zic turns this into 01:00 on the day after September's second 1349 Saturday, which is the best that POSIX or C platforms can do. 1350 1351 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 1352 paper by Li Yu, replacing more-questionable data from Shanks. 1353 1354 Changes to time zone abbreviations 1355 1356 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 1357 1358 Changes to code 1359 1360 zic now always generates TZif files where time type 0 is used for 1361 timestamps before the first transition. This simplifies the 1362 reading of TZif files and should not affect behavior of existing 1363 TZif readers because the same set of time types is used; only 1364 their internal indexes may have changed. This affects only the 1365 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 1366 EET, which previously used nonzero types for these timestamps. 1367 1368 Because of the type 0 change, zic no longer outputs a dummy 1369 transition at time -2**59 (before the Big Bang), as clients should 1370 no longer need this to handle historical timestamps correctly. 1371 This reverts a change introduced in 2013d and shrinks most TZif 1372 files by a few bytes. 1373 1374 zic now supports negative time-of-day in Rule and Leap lines, e.g., 1375 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 1376 occurs at 18:00 on the Saturday before the last Sunday in April. 1377 This behavior was documented in 2018a but the code did not 1378 entirely match the documentation. 1379 1380 localtime.c no longer requires at least one time type in TZif 1381 files that lack transitions or have a POSIX-style TZ string. This 1382 future-proofs the code against possible future extensions to the 1383 format that would allow TZif files with POSIX-style TZ strings and 1384 without transitions or time types. 1385 1386 A read-access subscript error in localtime.c has been fixed. 1387 It could occur only in TZif files with timecnt == 0, something that 1388 does not happen in practice now but could happen in future versions. 1389 1390 localtime.c no longer ignores TZif POSIX-style TZ strings that 1391 specify only standard time. Instead, these TZ strings now 1392 override the default time type for timestamps after the last 1393 transition (or for all timestamps if there are no transitions), 1394 just as DST strings specifying DST have always done. 1395 1396 leapseconds.awk now outputs "#updated" and "#expires" comments, 1397 and supports leap seconds at the ends of months other than June 1398 and December. (Inspired by suggestions from Chris Woodbury.) 1399 1400 Changes to documentation 1401 1402 New restrictions: A Rule name must start with a character that 1403 is neither an ASCII digit nor "-" nor "+", and an unquoted name 1404 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 1405 The latter restriction makes room for future extensions (a 1406 possibility noted by Tom Lane). 1407 1408 tzfile.5 now documents what time types apply before the first and 1409 after the last transition, if any. 1410 1411 Documentation now uses the spelling "timezone" for a TZ setting 1412 that determines timestamp history, and "time zone" for a 1413 geographic region currently sharing the same standard time. 1414 1415 The name "TZif" is now used for the tz binary data format. 1416 1417 tz-link.htm now mentions the A0 TimeZone Migration utilities. 1418 (Thanks to Aldrin Martoq for the link.) 1419 1420 Changes to build procedure 1421 1422 New 'make' target 'rearguard_tarballs' to build the rearguard 1423 tarball only. This is a convenience on platforms that lack lzip 1424 if you want to build the rearguard tarball. (Problem reported by 1425 Deborah Goldsmith.) 1426 1427 tzdata.zi is now more stable from release to release. (Problem 1428 noted by Tom Lane.) It is also a bit shorter. 1429 1430 tzdata.zi now can contain comment lines documenting configuration 1431 information, such as which data format was selected, which input 1432 files were used, and how leap seconds are treated. (Problems 1433 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 1434 are used these comment lines are absent, for backward 1435 compatibility. A redistributor intending to alter its copy of the 1436 files should also append "-LABEL" to the 'version' file's first 1437 line, where "LABEL" identifies the redistributor's change. 1438 1439 1440 Release 2018e - 2018-05-01 23:42:51 -0700 1441 1442 Briefly: 1443 1444 North Korea switches back to +09 on 2018-05-05. 1445 The main format uses negative DST again, for Ireland etc. 1446 'make tarballs' now also builds a rearguard tarball. 1447 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 1448 1449 Changes to past and future timestamps 1450 1451 North Korea switches back from +0830 to +09 on 2018-05-05. 1452 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 1453 and Tim Parenti.) 1454 1455 Bring back the negative-DST changes of 2018a, except be more 1456 compatible with data parsers that do not support negative DST. 1457 Also, this now affects historical timestamps in Namibia and the 1458 former Czechoslovakia, not just Ireland. The main format now uses 1459 negative DST to model timestamps in Europe/Dublin (from 1971 on), 1460 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 1461 does not affect UT offsets, only time zone abbreviations and the 1462 tm_isdst flag. Also, this does not affect rearguard or vanguard 1463 formats; effectively the main format now uses vanguard instead of 1464 rearguard format. Data parsers that do not support negative DST 1465 can still use data from the rearguard tarball described below. 1466 1467 Changes to build procedure 1468 1469 The command 'make tarballs' now also builds the tarball 1470 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 1471 except that it uses rearguard format intended for trailing-edge 1472 data parsers. 1473 1474 Changes to data format and to code 1475 1476 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 1477 suffix, which specifies whether the adjusted time is standard time 1478 or daylight saving time. If no suffix is given, daylight saving 1479 time is used if and only if the SAVE column is nonzero; this is 1480 the longstanding behavior. Although this new feature is not used 1481 in tzdata, it could be used to specify the legal time in Namibia 1482 1994-2017, as opposed to the popular time (see below). 1483 1484 Changes to past timestamps 1485 1486 From 1994 through 2017 Namibia observed DST in winter, not summer. 1487 That is, it used negative DST, as Ireland still does. This change 1488 does not affect UTC offsets; it affects only the tm_isdst flag and 1489 the abbreviation used during summer, which is now CAT, not WAST. 1490 Although (as noted by Michael Deckers) summer and winter time were 1491 both simply called "standard time" in Namibian law, in common 1492 practice winter time was considered to be DST (as noted by Stephen 1493 Colebourne). The full effect of this change is only in vanguard 1494 and main format; in rearguard format, the tm_isdst flag is still 1495 zero in winter and nonzero in summer. 1496 1497 In 1946/7 Czechoslovakia also observed negative DST in winter. 1498 The full effect of this change is only in vanguard and main 1499 formats; in rearguard format, it is modeled as plain GMT without 1500 daylight saving. Also, the dates of some 1944/5 DST transitions 1501 in Czechoslovakia have been changed. 1502 1503 1504 Release 2018d - 2018-03-22 07:05:46 -0700 1505 1506 Briefly: 1507 1508 Palestine starts DST a week earlier in 2018. 1509 Add support for vanguard and rearguard data consumers. 1510 Add subsecond precision to source data format, though not to data. 1511 1512 Changes to future timestamps 1513 1514 In 2018, Palestine starts DST on March 24, not March 31. 1515 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 1516 1517 Changes to past and future timestamps 1518 1519 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 1520 at 04:00. (Thanks to Steffen Thorsen.) 1521 1522 Changes to past timestamps 1523 1524 Historical transitions for Uruguay, represented by 1525 America/Montevideo, have been updated per official legal documents, 1526 replacing previous data mainly originating from the inventions of 1527 Shanks & Pottenger. This has resulted in adjustments ranging from 1528 30 to 90 minutes in either direction over at least two dozen 1529 distinct periods ranging from one day to several years in length. 1530 A mere handful of pre-1991 transitions are unaffected; data since 1531 then has come from more reliable contemporaneous reporting. These 1532 changes affect various timestamps in 1920-1923, 1936, 1939, 1533 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 1534 Additionally, Uruguay's pre-standard-time UT offset has been 1535 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 1536 match the location of the Observatory of the National Meteorological 1537 Institute in Montevideo. 1538 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 1539 1540 East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. 1541 (Thanks to Kerry Shetline.) 1542 1543 Fix the 1912-01-01 transition for Portugal and its colonies. 1544 This transition was at 00:00 according to the new UT offset, not 1545 according to the old one. Also assume that Cape Verde switched on 1546 the same date as the rest, not in 1907. This affects 1547 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 1548 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 1549 (Thanks to Michael Deckers.) 1550 1551 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 1552 Turks & Caicos. 1553 1554 Changes to past time zone abbreviations 1555 1556 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 1557 is no clock change associated with the transition. 1558 1559 Changes to build procedure 1560 1561 The new DATAFORM macro in the Makefile lets the installer choose 1562 among three source data formats. The idea is to lessen downstream 1563 disruption when data formats are improved. 1564 1565 * DATAFORM=vanguard installs from the latest, bleeding-edge 1566 format. DATAFORM=main (the default) installs from the format 1567 used in the 'africa' etc. files. DATAFORM=rearguard installs 1568 from a trailing-edge format. Eventually, elements of today's 1569 vanguard format should move to the main format, and similarly 1570 the main format's features should eventually move to the 1571 rearguard format. 1572 1573 * In the current version, the main and rearguard formats are 1574 identical and match that of 2018c, so this change does not 1575 affect default behavior. The vanguard format currently contains 1576 one feature not in the main format: negative SAVE values. This 1577 improves support for Ireland, which uses Irish Standard Time 1578 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 1579 supported negative SAVE values for decades, and this feature 1580 should move to the main format soon. However, it will not move 1581 to the rearguard format for quite some time because some 1582 downstream parsers do not support it. 1583 1584 * The build procedure constructs three files vanguard.zi, main.zi, 1585 and rearguard.zi, one for each format. Although the files 1586 represent essentially the same data, they may have minor 1587 discrepancies that users are not likely to notice. The files 1588 are intended for downstream data consumers and are not 1589 installed. Zoneinfo parsers that do not support negative SAVE values 1590 should start using rearguard.zi, so that they will be unaffected 1591 when the negative-DST feature moves from vanguard to main. 1592 Bleeding-edge Zoneinfo parsers that support the new features 1593 already can use vanguard.zi; in this respect, current tzcode is 1594 bleeding-edge. 1595 1596 The Makefile should now be safe for parallelized builds, and 'make 1597 -j to2050new.tzs' is now much faster on a multiprocessor host 1598 with GNU Make. 1599 1600 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 1601 prepends TZDIR/ to file names that do not begin with '/'. This is 1602 not recommended for general use, due to its security implications. 1603 (From a suggestion by Manuela Friedrich.) 1604 1605 Changes to code 1606 1607 zic now accepts subsecond precision in expressions like 1608 00:19:32.13, which is approximately the legal time of the 1609 Netherlands from 1835 to 1937. However, because it is 1610 questionable whether the few recorded uses of non-integer offsets 1611 had subsecond precision in practice, there are no plans for tzdata 1612 to use this feature. (Thanks to Steve Allen for pointing out 1613 the limitations of historical data in this area.) 1614 1615 The code is a bit more portable to MS-Windows. Installers can 1616 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 1617 reserve identifiers like 'localtime'. (Thanks to Manuela 1618 Friedrich.) 1619 1620 Changes to documentation and commentary 1621 1622 theory.html now outlines tzdb's extensions to POSIX's model for 1623 civil time, and has a section "POSIX features no longer needed" 1624 that lists POSIX API components that are now vestigial. 1625 (From suggestions by Steve Summit.) It also better distinguishes 1626 time zones from tz regions. (From a suggestion by Guy Harris.) 1627 1628 Commentary is now more consistent about using the phrase "daylight 1629 saving time", to match the C name tm_isdst. Daylight saving time 1630 need not occur in summer, and need not have a positive offset from 1631 standard time. 1632 1633 Commentary about historical transitions in Uruguay has been expanded 1634 with links to many relevant legal documents. 1635 (Thanks to Tim Parenti.) 1636 1637 Commentary now uses some non-ASCII characters with Unicode value 1638 less than U+0100, as they can be useful and should work even with 1639 older editors such as XEmacs. 1640 1641 1642 Release 2018c - 2018-01-22 23:00:44 -0800 1643 1644 Briefly: 1645 Revert Irish changes that relied on negative SAVE values. 1646 1647 Changes to tm_isdst 1648 1649 Revert the 2018a change to Europe/Dublin. As before, this change 1650 does not affect UT offsets or abbreviations; it affects only 1651 whether timestamps are considered to be standard time or 1652 daylight-saving time, as expressed in the tm_isdst flag of C's 1653 struct tm type. This reversion is intended to be a temporary 1654 workaround for problems discovered with downstream uses of 1655 releases 2018a and 2018b, which implemented Irish time by using 1656 negative SAVE values in the Eire rules of the 'europe' file. 1657 Although negative SAVE values have been part of tzcode for many 1658 years and are supported by many platforms, they were not 1659 documented before 2018a and ICU and OpenJDK do not currently 1660 support them. A mechanism to export data to platforms lacking 1661 support for negative DST is planned to be developed before the 1662 change is reapplied. (Problems reported by Deborah Goldsmith and 1663 Stephen Colebourne.) 1664 1665 Changes to past timestamps 1666 1667 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 1668 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 1669 1670 Changes to build procedure 1671 1672 The build procedure now works around mawk 1.3.3's lack of support 1673 for character class expressions. (Problem reported by Ohyama.) 1674 1675 1676 Release 2018b - 2018-01-17 23:24:48 -0800 1677 1678 Briefly: 1679 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 1680 1681 Changes to build procedure 1682 1683 The distribution now contains the file 'pacificnew' again. 1684 This file was inadvertently omitted in the 2018a distribution. 1685 (Problem reported by Matias Fonzo.) 1686 1687 1688 Release 2018a - 2018-01-12 22:29:21 -0800 1689 1690 Briefly: 1691 So Tom and Prncipe switched from +00 to +01. 1692 Brazil's DST will now start on November's first Sunday. 1693 Ireland's standard time is now in the summer, not the winter. 1694 Use Debian-style installation locations, instead of 4.3BSD-style. 1695 New zic option -t. 1696 1697 Changes to past and future timestamps 1698 1699 So Tom and Prncipe switched from +00 to +01 on 2018-01-01 at 1700 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 1701 1702 Changes to future timestamps 1703 1704 Starting in 2018 southern Brazil will begin DST on November's 1705 first Sunday instead of October's third Sunday. (Thanks to 1706 Steffen Thorsen.) 1707 1708 Changes to past timestamps 1709 1710 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 1711 been corrected. The 'backzone' and 'zone.tab' files did not agree 1712 with the 'africa' and 'zone1970.tab' files. (Problem reported by 1713 Michael Deckers.) 1714 1715 The abbreviation invented for Bolivia Summer Time (1931-2) is now 1716 BST instead of BOST, to be more consistent with the convention 1717 used for Latvian Summer Time (1918-9) and for British Summer Time. 1718 1719 Changes to tm_isdst 1720 1721 Change Europe/Dublin so that it observes Irish Standard Time (UT 1722 +01) in summer and GMT (as negative daylight-saving) in winter, 1723 instead of observing standard time (GMT) in winter and Irish 1724 Summer Time (UT +01) in summer. This change does not affect UT 1725 offsets or abbreviations; it affects only whether timestamps are 1726 considered to be standard time or daylight-saving time, as 1727 expressed in the tm_isdst flag of C's struct tm type. 1728 (Discrepancy noted by Derick Rethans.) 1729 1730 Changes to build procedure 1731 1732 The default installation locations have been changed to mostly 1733 match Debian circa 2017, instead of being designed as an add-on to 1734 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 1735 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 1736 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 1737 locations more precisely. (This responds to suggestions from 1738 Brian Inglis and from Steve Summit.) 1739 1740 The default installation procedure no longer creates the 1741 backward-compatibility link US/Pacific-New, which causes 1742 confusion during user setup (e.g., see Debian bug 815200). 1743 Use 'make BACKWARD="backward pacificnew"' to create the link 1744 anyway, for now. Eventually we plan to remove the link entirely. 1745 1746 tzdata.zi now contains a version-number comment. 1747 (Suggested by Tom Lane.) 1748 1749 The Makefile now quotes values like BACKWARD more carefully when 1750 passing them to the shell. (Problem reported by Zefram.) 1751 1752 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 1753 that have snprintf and use pre-C99 compilers. (Problem reported 1754 by Jon Skeet.) 1755 1756 Changes to code 1757 1758 zic has a new option -t FILE that specifies the location of the 1759 file that determines local time when TZ is unset. The default for 1760 this location can be configured via the new TZDEFAULT makefile 1761 macro, which defaults to /etc/localtime. 1762 1763 Diagnostics and commentary now distinguish UT from UTC more 1764 carefully; see theory.html for more information about UT vs UTC. 1765 1766 zic has been ported to GCC 8's -Wstringop-truncation option. 1767 (Problem reported by Martin Sebor.) 1768 1769 Changes to documentation and commentary 1770 1771 The zic man page now documents the longstanding behavior that 1772 times and years can be out of the usual range, with negative times 1773 counting backwards from midnight and with year 0 preceding year 1. 1774 (Problem reported by Michael Deckers.) 1775 1776 The theory.html file now mentions the POSIX limit of six chars 1777 per abbreviation, and lists alphabetic abbreviations used. 1778 1779 The files tz-art.htm and tz-link.htm have been renamed to 1780 tz-art.html and tz-link.html, respectively, for consistency with 1781 other file names and to simplify web server configuration. 1782 1783 1784 Release 2017c - 2017-10-20 14:49:34 -0700 1785 1786 Briefly: 1787 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 1788 Fiji ends DST 2018-01-14, not 2018-01-21. 1789 Namibia switches from +01/+02 to +02 on 2018-04-01. 1790 Sudan switches from +03 to +02 on 2017-11-01. 1791 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 1792 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 1793 A new file tzdata.zi now holds a small text copy of all data. 1794 The zic input format has been regularized slightly. 1795 1796 Changes to future timestamps 1797 1798 Northern Cyprus has decided to resume EU rules starting 1799 2017-10-29, thus reinstituting winter time. 1800 1801 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 1802 predicted. (Thanks to Dominic Fok.) Adjust future predictions 1803 accordingly. 1804 1805 Namibia will switch from +01 with DST to +02 all year on 1806 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 1807 at 02:00. (Thanks to Steffen Thorsen.) 1808 1809 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 1810 Atyya and Yahia Abdalla.) South Sudan is not switching, so 1811 Africa/Juba is no longer a link to Africa/Khartoum. 1812 1813 Tonga has likely ended its experiment with DST, and will not 1814 adjust its clocks on 2017-11-05. Although Tonga has not announced 1815 whether it will continue to observe DST, the IATA is assuming that 1816 it will not. (Thanks to David Wade.) 1817 1818 Turks & Caicos will switch from -04 all year to -05 with US DST on 1819 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 1820 at 02:00. (Thanks to Steffen Thorsen.) 1821 1822 Changes to past timestamps 1823 1824 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 1825 (Thanks to Arthur David Olson.) 1826 1827 Detroit did not observe DST in 1967. 1828 1829 Use railway time for Asia/Kolkata before 1941, by switching to 1830 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 1831 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 1832 1833 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 1834 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 1835 1836 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 1837 American time in 1892, not 1879. (Thanks to Michael Deckers.) 1838 1839 Adjust the 1867 transition in Alaska to better reflect the 1840 historical record, by changing it to occur on 1867-10-18 at 15:30 1841 Sitka time rather than at the start of 1867-10-17 local time. 1842 Although strictly speaking this is accurate only for Sitka, 1843 the rest of Alaska's blanks need to be filled in somehow. 1844 1845 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 1846 (Thanks to Michael Deckers.) 1847 1848 Add 7 s to the UT offset in Asia/Yangon before 1920. 1849 1850 Changes to zone names 1851 1852 Remove Canada/East-Saskatchewan from the 'backward' file, as it 1853 exceeded the 14-character limit and was an unused misnomer anyway. 1854 1855 Changes to build procedure 1856 1857 To support applications that prefer to read time zone data in text 1858 form, two zic input files tzdata.zi and leapseconds are now 1859 installed by default. The commands 'zic tzdata.zi' and 'zic -L 1860 leapseconds tzdata.zi' can reproduce the tzdata binary files 1861 without and with leap seconds, respectively. To prevent these two 1862 new files from being installed, use 'make TZDATA_TEXT=', and to 1863 suppress leap seconds from the tzdata text installation, use 'make 1864 TZDATA_TEXT=tzdata.zi'. 1865 1866 'make BACKWARD=' now suppresses backward-compatibility names 1867 like 'US/Pacific' that are defined in the 'backward' and 1868 'pacificnew' files. 1869 1870 'make check' now works on systems that lack a UTF-8 locale, 1871 or that lack the nsgmls program. Set UTF8_LOCALE to configure 1872 the name of a UTF-8 locale, if you have one. 1873 1874 Y2K runtime checks are no longer enabled by default. Add 1875 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 1876 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 1877 to disable them. (New name suggested by Brian Inglis.) 1878 1879 The build procedure for zdump now works on AIX 7.1. 1880 (Problem reported by Kees Dekker.) 1881 1882 Changes to code 1883 1884 zic and the reference runtime now reject multiple leap seconds 1885 within 28 days of each other, or leap seconds before the Epoch. 1886 As a result, support for double leap seconds, which was 1887 obsolescent and undocumented, has been removed. Double leap 1888 seconds were an error in the C89 standard; they have never existed 1889 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 1890 noticing glitches in the code that uncovered this problem.) 1891 1892 zic now warns about use of the obsolescent and undocumented -y 1893 option, and about use of the obsolescent TYPE field of Rule lines. 1894 1895 zic now allows unambiguous abbreviations like "Sa" and "Su" for 1896 weekdays; formerly it rejected them due to a bug. Conversely, zic 1897 no longer considers non-prefixes to be abbreviations; for example, 1898 it no longer accepts "lF" as an abbreviation for "lastFriday". 1899 Also, zic warns about the undocumented usage with a "last-" 1900 prefix, e.g., "last-Fri". 1901 1902 Similarly, zic now accepts the unambiguous abbreviation "L" for 1903 "Link" in ordinary context and for "Leap" in leap-second context. 1904 Conversely, zic no longer accepts non-prefixes such as "La" as 1905 abbreviations for words like "Leap". 1906 1907 zic no longer accepts leap second lines in ordinary input, or 1908 ordinary lines in leap second input. Formerly, zic sometimes 1909 warned about this undocumented usage and handled it incorrectly. 1910 1911 The new macro HAVE_TZNAME governs whether the tzname external 1912 variable is exported, instead of USG_COMPAT. USG_COMPAT now 1913 governs only the external variables "timezone" and "daylight". 1914 This change is needed because the three variables are not in the 1915 same category: although POSIX requires tzname, it specifies the 1916 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 1917 if not defined, the code attempts to guess it from other macros. 1918 1919 localtime.c and difftime.c no longer require stdio.h, and .c files 1920 other than zic.c no longer require sys/wait.h. 1921 1922 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 1923 1924 Calculation of time_t extrema works around a bug in GCC 4.8.4 1925 (Reported by Stan Shebs and Joseph Myers.) 1926 1927 zic.c no longer mistranslates formats of line numbers in non-English 1928 locales. (Problem reported by Benno Schulenberg.) 1929 1930 Several minor changes have been made to the code to make it a 1931 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 1932 Dekker for reporting the problems.) 1933 1934 Changes to documentation and commentary 1935 1936 The two new files 'theory.html' and 'calendars' contain the 1937 contents of the removed file 'Theory'. The goal is to document 1938 tzdb theory more accessibly. 1939 1940 The zic man page now documents abbreviation rules. 1941 1942 tz-link.htm now covers how to apply tzdata changes to clients. 1943 (Thanks to Jorge Fbregas for the AIX link.) It also mentions MySQL. 1944 1945 The leap-seconds.list URL has been updated to something that is 1946 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 1947 1948 Release 2017b - 2017-03-17 07:30:38 -0700 1949 1950 Briefly: Haiti has resumed DST. 1951 1952 Changes to past and future timestamps 1953 1954 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 1955 1956 Changes to past timestamps 1957 1958 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 1959 1960 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 1961 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 1962 1963 Changes to code 1964 1965 The reference localtime implementation now falls back on the 1966 current US daylight-saving transition rules rather than the 1967 1987-2006 rules. This fallback occurs only when (1) the TZ 1968 environment variable has a value like "AST4ADT" that asks 1969 for daylight saving time but does not specify the rules, (2) there 1970 is no file by that name, and (3) the TZDEFRULES file cannot be 1971 loaded. (Thanks to Tom Lane.) 1972 1973 1974 Release 2017a - 2017-02-28 00:05:36 -0800 1975 1976 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 1977 discontinues DST. 1978 1979 Changes to future timestamps 1980 1981 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 1982 1983 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 1984 Its clocks diverge from America/Santiago starting 2017-05-13 at 1985 23:00, hiving off a new zone America/Punta_Arenas. Although the 1986 Chilean government says this change expires in May 2019, for now 1987 assume it's permanent. (Thanks to Juan Correa and Deborah 1988 Goldsmith.) This also affects Antarctica/Palmer. 1989 1990 Changes to past timestamps 1991 1992 Fix many entries for historical timestamps for Europe/Madrid 1993 before 1979, to agree with tables compiled by Pere Planesas of the 1994 National Astronomical Observatory of Spain. As a side effect, 1995 this changes some timestamps for Africa/Ceuta before 1929, which 1996 are probably guesswork anyway. (Thanks to Steve Allen and 1997 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 1998 correcting the 1901 transition.) 1999 2000 Ecuador observed DST from 1992-11-28 to 1993-02-05. 2001 (Thanks to Alois Treindl.) 2002 2003 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 2004 (Thanks to Stepan Golosunov.) 2005 2006 Changes to past and future time zone abbreviations 2007 2008 Switch to numeric time zone abbreviations for South America, as 2009 part of the ongoing project of removing invented abbreviations. 2010 This avoids the need to invent an abbreviation for the new Chilean 2011 new zone. Similarly, switch from invented to numeric time zone 2012 abbreviations for Afghanistan, American Samoa, the Azores, 2013 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 2014 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 2015 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 2016 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 2017 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 2018 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 2019 Papua New Guinea, the Philippines, Pitcairn, Qatar, Runion, St 2020 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 2021 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 2022 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 2023 for half-hour daylight saving time in Belize before 1944 and in 2024 the Dominican Republic before 1975; and for Canary Islands before 2025 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 2026 Indian Summer Time before 1942, for Indonesia before around 1964, 2027 for Kenya before 1960, for Liberia before 1973, for Madeira before 2028 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 2029 Pakistan before 1971, for Western Sahara before 1977, and for 2030 Zaporozhye in 1880-1924. 2031 2032 For Alaska time from 1900 through 1967, instead of "CAT" use the 2033 abbreviation "AST", the abbreviation commonly used at the time 2034 (Atlantic Standard Time had not been standardized yet). Use "AWT" 2035 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 2036 2037 Use "CST" and "CDT" instead of invented abbreviations for Macau 2038 before 1999 and Taiwan before 1938, and use "JST" instead of the 2039 invented abbreviation "JCST" for Japan and Korea before 1938. 2040 2041 Change to database entry category 2042 2043 Move the Pacific/Johnston link from 'australasia' to 'backward', 2044 since Johnston is now uninhabited. 2045 2046 Changes to code 2047 2048 zic no longer mishandles some transitions in January 2038 when it 2049 attempts to work around Qt bug 53071. This fixes a bug affecting 2050 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 2051 now contains a workaround, useful when loading a file generated by 2052 a buggy zic. (Problem and localtime.c fix reported by Bradley 2053 White.) 2054 2055 zdump -i now outputs non-hour numeric time zone abbreviations 2056 without a colon, e.g., "+0530" rather than "+05:30". This agrees 2057 with zic %z and with common practice, and simplifies auditing of 2058 zdump output. 2059 2060 zdump is now buildable again with -DUSE_LTZ=0. 2061 (Problem reported by Joseph Myers.) 2062 2063 zdump.c now always includes private.h, to avoid code duplication 2064 with private.h. (Problem reported by Kees Dekker.) 2065 2066 localtime.c no longer mishandles early or late timestamps 2067 when TZ is set to a POSIX-style string that specifies DST. 2068 (Problem reported by Kees Dekker.) 2069 2070 date and strftime now cause %z to generate "-0000" instead of 2071 "+0000" when the UT offset is zero and the time zone abbreviation 2072 begins with "-". 2073 2074 Changes to documentation and commentary 2075 2076 The 'Theory' file now better documents choice of historical time 2077 zone abbreviations. (Problems reported by Michael Deckers.) 2078 2079 tz-link.htm now covers leap smearing, which is popular in clouds. 2080 2081 2082 Release 2016j - 2016-11-22 23:17:13 -0800 2083 2084 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 2085 2086 Changes to future timestamps 2087 2088 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 2089 This hives off a new zone Europe/Saratov from Europe/Volgograd. 2090 (Thanks to Yuri Konotopov and Stepan Golosunov.) 2091 2092 Changes to past timestamps 2093 2094 The new zone Asia/Atyrau for Atyra Region, Kazakhstan, is like 2095 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 2096 1999, not fall 1994. (Thanks to Stepan Golosunov.) 2097 2098 Changes to past time zone abbreviations 2099 2100 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 2101 summer time before 1948. The old use of "EET" was a typo. 2102 2103 Changes to code 2104 2105 zic no longer mishandles file systems that lack hard links, fixing 2106 bugs introduced in 2016g. (Problems reported by Tom Lane.) 2107 Also, when the destination already contains symbolic links, zic 2108 should now work better on systems where the 'link' system call 2109 does not follow symbolic links. 2110 2111 Changes to documentation and commentary 2112 2113 tz-link.htm now documents the relationship between release version 2114 numbers and development-repository commit tags. (Suggested by 2115 Paul Koning.) 2116 2117 The 'Theory' file now documents UT. 2118 2119 iso3166.tab now accents "Curaao", and commentary now mentions 2120 the names "Cabo Verde" and "Czechia". (Thanks to Ji Boh.) 2121 2122 2123 Release 2016i - 2016-11-01 23:19:52 -0700 2124 2125 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 2126 reintroduces DST on 2016-11-06. 2127 2128 Changes to future timestamps 2129 2130 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 2131 2017-01-15 at 03:00. Assume future observances in Tonga will be 2132 from the first Sunday in November through the third Sunday in 2133 January, like Fiji. (Thanks to Pulu Anau.) Switch to numeric 2134 time zone abbreviations for this zone. 2135 2136 Changes to past and future timestamps 2137 2138 Northern Cyprus is now +03 year round, causing a split in Cyprus 2139 time zones starting 2016-10-30 at 04:00. This creates a zone 2140 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 2141 2142 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 2143 (Thanks to Steffen Thorsen.) 2144 2145 Changes to past timestamps 2146 2147 Several corrections were made for pre-1975 timestamps in Italy. 2148 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 2149 Europe/Vatican. 2150 2151 First, the 1893-11-01 00:00 transition in Italy used the new UT 2152 offset (+01), not the old (+00:49:56). (Thanks to Michael 2153 Deckers.) 2154 2155 Second, rules for daylight saving in Italy were changed to agree 2156 with Italy's National Institute of Metrological Research (INRiM) 2157 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 2158 Inglis, and Michael Deckers): 2159 2160 The 1916-06-03 transition was at 24:00, not 00:00. 2161 2162 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 2163 00:00, not 01:00. 2164 2165 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 2166 01:00. 2167 2168 The 1944-09-17 transition was at 03:00, not 01:00. This 2169 particular change is taken from Italian law as INRiM's table, 2170 (which says 02:00) appears to have a typo here. Also, keep the 2171 1944-04-03 transition for Europe/Rome, as Rome was controlled by 2172 Germany then. 2173 2174 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 2175 not 00:00. 2176 2177 Changes to code 2178 2179 The code should now be buildable on AmigaOS merely by setting the 2180 appropriate Makefile variables. (From a patch by Carsten Larsen.) 2181 2182 2183 Release 2016h - 2016-10-19 23:17:57 -0700 2184 2185 Changes to future timestamps 2186 2187 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 2188 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 2189 future fall transitions will be on the last Saturday of October 2190 at 01:00, which is consistent with predicted spring transitions 2191 on the last Saturday of March. (Thanks to Tim Parenti.) 2192 2193 Changes to past timestamps 2194 2195 In Turkey, transitions in 1986-1990 were at 01:00 standard time 2196 not at 02:00, and the spring 1994 transition was on March 20, not 2197 March 27. (Thanks to Kvan Yazan.) 2198 2199 Changes to past and future time zone abbreviations 2200 2201 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 2202 instead of alphabetic ones like "IST" and "LKT". Various 2203 English-language sources use "IST", "LKT" and "SLST", with no 2204 working consensus. (Usage of "SLST" mentioned by Sadika 2205 Sumanapala.) 2206 2207 Changes to code 2208 2209 zic no longer mishandles relativizing file names when creating 2210 symbolic links like /etc/localtime, when these symbolic links 2211 are outside the usual directory hierarchy. This fixes a bug 2212 introduced in 2016g. (Problem reported by Andreas Stieger.) 2213 2214 Changes to build procedure 2215 2216 New rules 'traditional_tarballs' and 'traditional_signatures' for 2217 building just the traditional-format distribution. (Requested by 2218 Deborah Goldsmith.) 2219 2220 The file 'version' is now put into the tzdata tarball too. 2221 (Requested by Howard Hinnant.) 2222 2223 Changes to documentation and commentary 2224 2225 The 'Theory' file now has a section on interface stability. 2226 (Requested by Paul Koning.) It also mentions features like 2227 tm_zone and localtime_rz that have long been supported by the 2228 reference code. 2229 2230 tz-link.htm has improved coverage of time zone boundaries suitable 2231 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 2232 Johnson.) 2233 2234 The US commentary now mentions Allen and the "day of two noons". 2235 2236 The Fiji commentary mentions the government's 2016-10-03 press 2237 release. (Thanks to Raymond Kumar.) 2238 2239 2240 Release 2016g - 2016-09-13 08:56:38 -0700 2241 2242 Changes to future timestamps 2243 2244 Turkey switched from EET/EEST (+02/+03) to permanent +03, 2245 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 2246 than an invented abbreviation for the new time. 2247 2248 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 2249 (Thanks to Tim Parenti.) 2250 2251 Changes to past timestamps 2252 2253 For America/Los_Angeles, spring-forward transition times have been 2254 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 2255 1950-1966. 2256 2257 For zones using Soviet time on 1919-07-01, transitions to UT-based 2258 time were at 00:00 UT, not at 02:00 local time. The affected 2259 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 2260 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 2261 2262 Changes to past and future time zone abbreviations 2263 2264 The Factory zone now uses the time zone abbreviation -00 instead 2265 of a long English-language string, as -00 is now the normal way to 2266 represent an undefined time zone. 2267 2268 Several zones in Antarctica and the former Soviet Union, along 2269 with zones intended for ships at sea that cannot use POSIX TZ 2270 strings, now use numeric time zone abbreviations instead of 2271 invented or obsolete alphanumeric abbreviations. The affected 2272 zones are Antarctica/Casey, Antarctica/Davis, 2273 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 2274 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 2275 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 2276 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 2277 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 2278 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 2279 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 2280 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 2281 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 2282 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 2283 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 2284 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 2285 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 2286 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 2287 was replaced by +05, whereas MSK and MSD were kept as they are not 2288 our invention and are widely used. 2289 2290 Changes to zone names 2291 2292 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 2293 (Thanks to David Massoud.) 2294 2295 Changes to code 2296 2297 zic no longer generates binary files containing POSIX TZ-like 2298 strings that disagree with the local time type after the last 2299 explicit transition in the data. This fixes a bug with 2300 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 2301 on the reference platform. (Thanks to Alexander Belopolsky for 2302 reporting the bug and suggesting a way forward.) 2303 2304 If the installed localtime and/or posixrules files are symbolic 2305 links, zic now keeps them symbolic links when updating them, for 2306 compatibility with platforms like OpenSUSE where other programs 2307 configure these files as symlinks. 2308 2309 zic now avoids hard linking to symbolic links, avoids some 2310 unnecessary mkdir and stat system calls, and uses shorter file 2311 names internally. 2312 2313 zdump has a new -i option to generate transitions in a 2314 more-compact but still human-readable format. This option is 2315 experimental, and the output format may change in future versions. 2316 (Thanks to Jon Skeet for suggesting that an option was needed, 2317 and thanks to Tim Parenti and Chris Rovick for further comments.) 2318 2319 Changes to build procedure 2320 2321 An experimental distribution format is available, in addition 2322 to the traditional format which will continue to be distributed. 2323 The new format is a tarball tzdb-VERSION.tar.lz with signature 2324 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 2325 tzdb-VERSION containing the code and data of the traditional 2326 two-tarball format, along with extra data that may be useful. 2327 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 2328 for comments about the experimental format.) 2329 2330 The release version number is now more accurate in the usual case 2331 where releases are built from a Git repository. For example, if 2332 23 commits and some working-file changes have been made since 2333 release 2016g, the version number is now something like 2334 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 2335 Tagged releases use the same version number format as before, 2336 e.g., '2016g'. To support the more-accurate version number, its 2337 specification has moved from a line in the Makefile to a new 2338 source file 'version'. 2339 2340 The experimental distribution contains a file to2050.tzs that 2341 contains what should be the output of 'zdump -i -c 2050' on 2342 primary zones. If this file is available, 'make check' now checks 2343 that zdump generates this output. 2344 2345 'make check_web' now works on Fedora-like distributions. 2346 2347 Changes to documentation and commentary 2348 2349 tzfile.5 now documents the new restriction on POSIX TZ-like 2350 strings that is now implemented by zic. 2351 2352 Comments now cite URLs for some 1917-1921 Russian DST decrees. 2353 (Thanks to Alexander Belopolsky.) 2354 2355 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 2356 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 2357 description of Java 8 has been brought up to date (thanks to 2358 Stephen Colebourne). Its description of local time on Mars has 2359 been updated to match current practice, and URLs have been updated 2360 and some obsolete ones removed. 2361 2362 2363 Release 2016f - 2016-07-05 16:26:51 +0200 2364 2365 Changes affecting future timestamps 2366 2367 The Egyptian government changed its mind on short notice, and 2368 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 2369 (Thanks to Mina Samuel.) 2370 2371 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 2372 (Thanks to Stepan Golosunov.) 2373 2374 Changes to past and future timestamps 2375 2376 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 2377 abbreviations instead of invented ones. 2378 2379 Changes affecting past timestamps 2380 2381 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 2382 (Thanks to Stepan Golosunov.) 2383 2384 2385 Release 2016e - 2016-06-14 08:46:16 -0700 2386 2387 Changes affecting future timestamps 2388 2389 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 2390 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 2391 For future years, guess April's last Thursday to October's last 2392 Thursday except for Ramadan. 2393 2394 Changes affecting past timestamps 2395 2396 Locations while uninhabited now use '-00', not 'zzz', as a 2397 placeholder time zone abbreviation. This is inspired by Internet 2398 RFC 3339 and is more consistent with numeric time zone 2399 abbreviations already used elsewhere. The change affects several 2400 arctic and antarctic locations, e.g., America/Cambridge_Bay before 2401 1920 and Antarctica/Troll before 2005. 2402 2403 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 2404 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 2405 2406 Changes to code 2407 2408 zic now outputs a dummy transition at time 2**31 - 1 in zones 2409 whose POSIX-style TZ strings contain a '<'. This mostly works 2410 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 2411 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 2412 2413 Changes affecting documentation and commentary 2414 2415 tz-link.htm says why governments should give plenty of notice for 2416 time zone or DST changes, and refers to Matt Johnson's blog post. 2417 2418 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 2419 2420 2421 Release 2016d - 2016-04-17 22:50:29 -0700 2422 2423 Changes affecting future timestamps 2424 2425 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 2426 (Thanks to Alexander Krivenyshev for the heads-up.) 2427 2428 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 2429 (Thanks to Alexander Krivenyshev and Matt Johnson.) 2430 2431 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 2432 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 2433 at 02:00. (Thanks to Stepan Golosunov.) 2434 2435 Changes affecting past timestamps 2436 2437 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 2438 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 2439 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 2440 the same change. (Thanks to Stepan Golosunov.) 2441 2442 Russia and nearby locations had daylight-saving transitions on 2443 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 2444 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 2445 Golosunov.) 2446 2447 Many corrections to historical time in Kazakhstan from 1991 2448 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 2449 invented time zone abbreviations with numeric abbreviations. 2450 2451 Changes to commentary 2452 2453 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 2454 2455 2456 Release 2016c - 2016-03-23 00:51:27 -0700 2457 2458 Changes affecting future timestamps 2459 2460 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 2461 2462 Chile reverts from permanent to seasonal DST. (Thanks to Juan 2463 Correa for the heads-up, and to Tim Parenti for corrections.) 2464 Guess that future transitions are August's and May's second 2465 Saturdays at 24:00 mainland time. Also, call the period from 2466 2014-09-07 through 2016-05-14 daylight saving time instead of 2467 standard time, as that seems more appropriate now. 2468 2469 Changes affecting past timestamps 2470 2471 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 2472 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 2473 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 2474 (Thanks to Stepan Golosunov.) 2475 2476 Changes to commentary 2477 2478 Several updates and URLs for historical and proposed Russian changes. 2479 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 2480 2481 2482 Release 2016b - 2016-03-12 17:30:14 -0800 2483 2484 Compatibility note 2485 2486 Starting with release 2016b, some data entries cause zic implementations 2487 derived from tz releases 2005j through 2015e to issue warnings like 2488 "time zone abbreviation differs from POSIX standard (+03)". 2489 These warnings should not otherwise affect zic's output and can safely be 2490 ignored on today's platforms, as the warnings refer to a restriction in 2491 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 2492 warnings is to upgrade to zic derived from tz releases 2015f and later. 2493 2494 Changes affecting future timestamps 2495 2496 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 2497 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 2498 2016-03-27 at 02:00 local time. They need distinct zones since their 2499 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 2500 Altai Republic, Russia, which will switch from +06 to +07 on the same date 2501 and local time. The Astrakhan change is already official; the others have 2502 passed the first reading in the State Duma and are extremely likely. 2503 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 2504 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 2505 and Stepan Golosunov for followup.) 2506 2507 As a trial of a new system that needs less information to be made up, 2508 the new zones use numeric time zone abbreviations like "+04" 2509 instead of invented abbreviations like "ASTT". 2510 2511 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 2512 Steffen Thorsen.) 2513 2514 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 2515 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 2516 Saturday at 01:00, not March's last Friday at 24:00. 2517 2518 Changes affecting past timestamps 2519 2520 Europe/Chisinau observed DST during 1990, and switched from +04 to 2521 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 2522 (Thanks to Stepan Golosunov.) 2523 2524 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 2525 KUYT/KUYST. (Thanks to Stepan Golosunov.) 2526 2527 Changes to code 2528 2529 tzselect's diagnostics and checking, and checktab.awk's checking, 2530 have been improved. (Thanks to J William Piggott.) 2531 2532 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 2533 2534 tzselect now tests Julian-date TZ settings more accurately. 2535 (Thanks to J William Piggott.) 2536 2537 Changes to commentary 2538 2539 Comments in zone tables have been improved. (Thanks to J William Piggott.) 2540 2541 tzselect again limits its menu comments so that menus fit on a 2542 2480 alphanumeric display. 2543 2544 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 2545 2546 In the Theory file, the description of possible time zone abbreviations in 2547 tzdata has been cleaned up, as the old description was unclear and 2548 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 2549 2550 2551 Release 2016a - 2016-01-26 23:28:02 -0800 2552 2553 Changes affecting future timestamps 2554 2555 America/Cayman will not observe daylight saving this year after all. 2556 Revert our guess that it would. (Thanks to Matt Johnson.) 2557 2558 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 2559 (Thanks to Alexander Krivenyshev.) 2560 2561 Asia/Tehran now has DST predictions for the year 2038 and later, 2562 to be March 21 00:00 to September 21 00:00. This is likely better 2563 than predicting no DST, albeit off by a day every now and then. 2564 2565 Changes affecting past and future timestamps 2566 2567 America/Metlakatla switched from PST all year to AKST/AKDT on 2568 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 2569 2570 America/Santa_Isabel has been removed, and replaced with a 2571 backward compatibility link to America/Tijuana. Its contents were 2572 apparently based on a misreading of Mexican legislation. 2573 2574 Changes affecting past timestamps 2575 2576 Asia/Karachi's two transition times in 2002 were off by a minute. 2577 (Thanks to Matt Johnson.) 2578 2579 Changes affecting build procedure 2580 2581 An installer can now combine leap seconds with use of the backzone file, 2582 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 2583 The old 'make posix_packrat' rule is now marked as obsolescent. 2584 (Thanks to Ian Abbott for an initial implementation.) 2585 2586 Changes affecting documentation and commentary 2587 2588 A new file LICENSE makes it easier to see that the code and data 2589 are mostly public-domain. (Thanks to James Knight.) The three 2590 non-public-domain files now use the current (3-clause) BSD license 2591 instead of older versions of that license. 2592 2593 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 2594 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 2595 on editing tz source files (with a mention of Sublime zoneinfo, 2596 thanks to Gilmore Davidson). 2597 2598 The Theory and asia files now mention the 2015 book "The Global 2599 Transformation of Time, 1870-1950", and cite a couple of reviews. 2600 2601 The America/Chicago entry now documents the informal use of US 2602 central time in Fort Pierre, South Dakota. (Thanks to Rick 2603 McDermid, Matt Johnson, and Steve Jones.) 2604 2605 2606 Release 2015g - 2015-10-01 00:39:51 -0700 2607 2608 Changes affecting future timestamps 2609 2610 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 2611 (Thanks to Fatih.) 2612 2613 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 2614 (Thanks to Alexander Krivenyshev.) 2615 2616 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 2617 (Thanks to Ken Rylander.) 2618 2619 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 2620 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 2621 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 2622 2623 Changes affecting past timestamps 2624 2625 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 2626 2627 Changes affecting code 2628 2629 localtime no longer mishandles America/Anchorage after 2037. 2630 (Thanks to Bradley White for reporting the bug.) 2631 2632 On hosts with signed 32-bit time_t, localtime no longer mishandles 2633 Pacific/Fiji after 2038-01-16 14:00 UTC. 2634 2635 The localtime module allows the variables 'timezone', 'daylight', 2636 and 'altzone' to be in common storage shared with other modules, 2637 and declares them in case the system <time.h> does not. 2638 (Problems reported by Kees Dekker.) 2639 2640 On platforms with tm_zone, strftime.c now assumes it is not NULL. 2641 This simplifies the code and is consistent with zdump.c. 2642 (Problem reported by Christos Zoulas.) 2643 2644 Changes affecting documentation 2645 2646 The tzfile man page now documents that transition times denote the 2647 starts (not the ends) of the corresponding time periods. 2648 (Ambiguity reported by Bill Seymour.) 2649 2650 2651 Release 2015f - 2015-08-10 18:06:56 -0700 2652 2653 Changes affecting future timestamps 2654 2655 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 2656 The abbreviation remains "KST". (Thanks to Robert Elz.) 2657 2658 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 2659 and Pablo Camargo.) 2660 2661 Changes affecting past and future timestamps 2662 2663 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 2664 (Thanks to Roman Tudos.) 2665 2666 Changes affecting data format and code 2667 2668 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 2669 field of a Rule line should now be '-'; the old values 'even', 2670 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 2671 Although the implementation has not changed, these features do not 2672 work in the default installation, they are not used in the data, 2673 and they are now considered obsolescent. 2674 2675 zic now checks that two rules don't take effect at the same time. 2676 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 2677 simultaneity are now documented. 2678 2679 The two characters '%z' in a zone format now stand for the UT 2680 offset, e.g., '-07' for seven hours behind UT and '+0530' for 2681 five hours and thirty minutes ahead. This better supports time 2682 zone abbreviations conforming to POSIX.1-2001 and later. 2683 2684 Changes affecting installed data files 2685 2686 Comments for America/Halifax and America/Glace_Bay have been improved. 2687 (Thanks to Brian Inglis.) 2688 2689 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 2690 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 2691 installed data files for Europe/Simferopol and Europe/Tallinn. 2692 It does not affect timestamps. (Thanks to Howard Hinnant.) 2693 2694 Changes affecting code 2695 2696 zdump and zic no longer warn about valid time zone abbreviations 2697 like '-05'. 2698 2699 Some Visual Studio 2013 warnings have been suppressed. 2700 (Thanks to Kees Dekker.) 2701 2702 'date' no longer sets the time of day and its -a, -d, -n and -t 2703 options have been removed. Long obsolescent, the implementation 2704 of these features had porting problems. Builders no longer need 2705 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 2706 (Thanks to Kees Dekker for pointing out the problem.) 2707 2708 Changes affecting documentation 2709 2710 The Theory file mentions naming issues earlier, as these seem to be 2711 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 2712 2713 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 2714 2715 Mention that Herbert Samuel introduced the term "Summer Time". 2716 2717 2718 Release 2015e - 2015-06-13 10:56:02 -0700 2719 2720 Changes affecting future timestamps 2721 2722 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 2723 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 2724 2725 Assume Cayman Islands will observe DST starting next year, using US rules. 2726 Although it isn't guaranteed, it is the most likely. 2727 2728 Changes affecting data format 2729 2730 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 2731 spell the names of land Islands, Cte d'Ivoire, and Runion. 2732 2733 Changes affecting code 2734 2735 When displaying data, tzselect converts it to the current locale's 2736 encoding if the iconv command works. (Problem reported by random832.) 2737 2738 tzselect no longer mishandles Dominica, fixing a bug introduced 2739 in Release 2014f. (Problem reported by Owen Leibman.) 2740 2741 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 2742 This fixes a bug introduced in Release 2014f. 2743 (Problem reported by Leonardo Chiquitto.) 2744 2745 2746 Release 2015d - 2015-04-24 08:09:46 -0700 2747 2748 Changes affecting future timestamps 2749 2750 Egypt will not observe DST in 2015 and will consider canceling it 2751 permanently. For now, assume no DST indefinitely. 2752 (Thanks to Ahmed Nazmy and Tim Parenti.) 2753 2754 Changes affecting past timestamps 2755 2756 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 2757 1966-07-01. Also, Yukon's time zone history is documented better. 2758 (Thanks to Brian Inglis and Dennis Ferguson.) 2759 2760 Change affecting past and future time zone abbreviations 2761 2762 The abbreviations for Hawaii-Aleutian standard and daylight times 2763 have been changed from HAST/HADT to HST/HDT, as per US Government 2764 Printing Office style. This affects only America/Adak since 1983, 2765 as America/Honolulu was already using the new style. 2766 2767 Changes affecting code 2768 2769 zic has some minor performance improvements. 2770 2771 2772 Release 2015c - 2015-04-11 08:55:55 -0700 2773 2774 Changes affecting future timestamps 2775 2776 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 2777 not 00:00 on April's last Friday. 2015's transition will therefore be on 2778 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 2779 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 2780 2781 Changes affecting past timestamps 2782 2783 The following changes affect some pre-1991 Chile-related timestamps 2784 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 2785 2786 The 1910 transition was January 10, not January 1. 2787 2788 The 1918 transition was September 10, not September 1. 2789 2790 The UT -04 time observed from 1932 to 1942 is now considered to 2791 be standard time, not year-round DST. 2792 2793 Santiago observed DST (UT -03) from 1946-07-15 through 2794 1946-08-31, then reverted to standard time, then switched to -05 2795 on 1947-04-01. 2796 2797 Assume transitions before 1968 were at 00:00, since we have no data 2798 saying otherwise. 2799 2800 The spring 1988 transition was 1988-10-09, not 1988-10-02. 2801 The fall 1990 transition was 1990-03-11, not 1990-03-18. 2802 2803 Assume no UT offset change for Pacific/Easter on 1890-01-01, 2804 and omit all transitions on Pacific/Easter from 1942 through 1946 2805 since we have no data suggesting that they existed. 2806 2807 One more zone has been turned into a link, as it differed 2808 from an existing zone only for older timestamps. As usual, 2809 this change affects UT offsets in pre-1970 timestamps only. 2810 The zone's old contents have been moved to the 'backzone' file. 2811 The affected zone is America/Montreal. 2812 2813 Changes affecting commentary 2814 2815 Mention the TZUpdater tool. 2816 2817 Mention "The Time Now". (Thanks to Brandon Ramsey.) 2818 2819 2820 Release 2015b - 2015-03-19 23:28:11 -0700 2821 2822 Changes affecting future timestamps 2823 2824 Mongolia will start observing DST again this year, from the last 2825 Saturday in March at 02:00 to the last Saturday in September at 00:00. 2826 (Thanks to Ganbold Tsagaankhuu.) 2827 2828 Palestine will start DST on March 28, not March 27. Also, 2829 correct the fall 2014 transition from September 26 to October 24. 2830 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 2831 2832 Changes affecting past timestamps 2833 2834 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 2835 regression. (Thanks to Stuart Bishop for reporting the problem.) 2836 2837 Some more zones have been turned into links, when they differed 2838 from existing zones only for older timestamps. As usual, 2839 these changes affect UT offsets in pre-1970 timestamps only. 2840 Their old contents have been moved to the 'backzone' file. 2841 The affected zones are: America/Antigua, America/Cayman, 2842 Pacific/Midway, and Pacific/Saipan. 2843 2844 Changes affecting time zone abbreviations 2845 2846 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 2847 (Thanks to Hank W.) 2848 2849 Changes affecting code 2850 2851 Fix integer overflow bug in reference 'mktime' implementation. 2852 (Problem reported by Jrg Richter.) 2853 2854 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 2855 to be used in the same executable as standard-library time_t functions. 2856 (Problems reported by Bradley White.) 2857 2858 Changes affecting commentary 2859 2860 Cite the recent Mexican decree changing Quintana Roo's time zone. 2861 (Thanks to Carlos Ral Perasso.) 2862 2863 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 2864 2865 Update info about Mars time. 2866 2867 2868 Release 2015a - 2015-01-29 22:35:20 -0800 2869 2870 Changes affecting future timestamps 2871 2872 The Mexican state of Quintana Roo, represented by America/Cancun, 2873 will shift from Central Time with DST to Eastern Time without DST 2874 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 2875 2876 Chile will not change clocks in April or thereafter; its new standard time 2877 will be its old daylight saving time. This affects America/Santiago, 2878 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 2879 2880 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 2881 (Thanks to Tim Parenti.) 2882 2883 Changes affecting past timestamps 2884 2885 Iceland observed DST in 1919 and 1921, and its 1939 fallback 2886 transition was Oct. 29, not Nov. 29. Remove incorrect data from 2887 Shanks about time in Iceland between 1837 and 1908. 2888 2889 Some more zones have been turned into links, when they differed 2890 from existing zones only for older timestamps. As usual, 2891 these changes affect UT offsets in pre-1970 timestamps only. 2892 Their old contents have been moved to the 'backzone' file. 2893 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 2894 and Asia/Muscat. 2895 2896 Changes affecting code 2897 2898 tzalloc now scrubs time zone abbreviations compatibly with the way 2899 that tzset always has, by replacing invalid bytes with '_' and by 2900 shortening too-long abbreviations. 2901 2902 tzselect ports to POSIX awk implementations, no longer mishandles 2903 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 2904 settings to the user. (Thanks to Stefan Kuhn.) 2905 2906 Changes affecting build procedure 2907 2908 'make check' now checks for links to links in the data. 2909 One such link (for Africa/Asmera) has been fixed. 2910 (Thanks to Stephen Colebourne for pointing out the problem.) 2911 2912 Changes affecting commentary 2913 2914 The leapseconds file commentary now mentions the expiration date. 2915 (Problem reported by Martin Burnicki.) 2916 2917 Update Mexican Library of Congress URL. 2918 2919 2920 Release 2014j - 2014-11-10 17:37:11 -0800 2921 2922 Changes affecting current and future timestamps 2923 2924 Turks & Caicos' switch from US eastern time to UT -04 year-round 2925 did not occur on 2014-11-02 at 02:00. It's currently scheduled 2926 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 2927 2928 Changes affecting past timestamps 2929 2930 Many pre-1989 timestamps have been corrected for Asia/Seoul and 2931 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 2932 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 2933 longer guess that Pyongyang mimicked Seoul time after World War II, 2934 as this is politically implausible. 2935 2936 Some more zones have been turned into links, when they differed 2937 from existing zones only for older timestamps. As usual, 2938 these changes affect UT offsets in pre-1970 timestamps only. 2939 Their old contents have been moved to the 'backzone' file. 2940 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 2941 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 2942 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 2943 Indian/Mayotte. 2944 2945 Changes affecting commentary 2946 2947 The commentary is less enthusiastic about Shanks as a source, 2948 and is more careful to distinguish UT from UTC. 2949 2950 2951 Release 2014i - 2014-10-21 22:04:57 -0700 2952 2953 Changes affecting future timestamps 2954 2955 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 2956 (Thanks to Ken Rylander for the heads-up.) Guess that future 2957 years will use a similar pattern. 2958 2959 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 2960 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 2961 (Thanks to Kiley Walbom for the heads-up.) 2962 2963 Changes affecting time zone abbreviations 2964 2965 Since Belarus is not changing its clocks even though Moscow is, 2966 the time zone abbreviation in Europe/Minsk is changing from FET 2967 to its more-traditional value MSK on 2014-10-26 at 01:00. 2968 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 2969 2970 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 2971 Indochina, to distinguish it better from ICT (+07). 2972 2973 Changes affecting past timestamps 2974 2975 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 2976 (thanks to Trn Ngc Qun for an indirect pointer to Trn Tin Bnh's 2977 authoritative book). Asia/Ho_Chi_Minh has been added to 2978 zone1970.tab, to give tzselect users in Vietnam two choices, 2979 since north and south Vietnam disagreed after our 1970 cutoff. 2980 2981 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 2982 they differed from existing zones only for older timestamps. As 2983 usual, these changes affect pre-1970 timestamps only. Their old 2984 contents have been moved to the 'backzone' file. 2985 2986 Changes affecting code 2987 2988 The time-related library functions now set errno on failure, and 2989 some crashes in the new tzalloc-related library functions have 2990 been fixed. (Thanks to Christos Zoulas for reporting most of 2991 these problems and for suggesting fixes.) 2992 2993 If USG_COMPAT is defined and the requested timestamp is standard time, 2994 the tz library's localtime and mktime functions now set the extern 2995 variable timezone to a value appropriate for that timestamp; and 2996 similarly for ALTZONE, daylight saving time, and the altzone variable. 2997 This change is a companion to the tzname change in 2014h, and is 2998 designed to make timezone and altzone more compatible with tzname. 2999 3000 The tz library's functions now set errno to EOVERFLOW if they fail 3001 because the result cannot be represented. ctime and ctime_r now 3002 return NULL and set errno when a timestamp is out of range, rather 3003 than having undefined behavior. 3004 3005 Some bugs associated with the new 2014g functions have been fixed. 3006 This includes a bug that largely incapacitated the new functions 3007 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 3008 It also includes some uses of uninitialized variables after tzalloc. 3009 The new code uses the standard type 'ssize_t', which the Makefile 3010 now gives porting advice about. 3011 3012 Changes affecting commentary 3013 3014 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 3015 3016 3017 Release 2014h - 2014-09-25 18:59:03 -0700 3018 3019 Changes affecting past timestamps 3020 3021 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 3022 3023 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 3024 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 3025 3026 Some more zones have been turned into links, when they differed 3027 from existing zones only for older timestamps. As usual, 3028 these changes affect UT offsets in pre-1970 timestamps only. 3029 Their old contents have been moved to the 'backzone' file. 3030 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 3031 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 3032 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 3033 3034 Changes affecting code 3035 3036 zdump -V and -v now output gmtoff= values on all platforms, 3037 not merely on platforms defining TM_GMTOFF. 3038 3039 The tz library's localtime and mktime functions now set tzname to a value 3040 appropriate for the requested timestamp, and zdump now uses this 3041 on platforms not defining TM_ZONE, fixing a 2014g regression. 3042 (Thanks to Tim Parenti for reporting the problem.) 3043 3044 The tz library no longer sets tzname if localtime or mktime fails. 3045 3046 zdump -c no longer mishandles transitions near year boundaries. 3047 (Thanks to Tim Parenti for reporting the problem.) 3048 3049 An access to uninitialized data has been fixed. 3050 (Thanks to Jrg Richter for reporting the problem.) 3051 3052 When THREAD_SAFE is defined, the code ports to the C11 memory model. 3053 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 3054 and two threads race to initialize data used by gmtime-like functions. 3055 (Thanks to Andy Heninger for reporting the problems.) 3056 3057 Changes affecting build procedure 3058 3059 'make check' now checks better for properly-sorted data. 3060 3061 Changes affecting documentation and commentary 3062 3063 zdump's gmtoff=N output is now documented, and its isdst=D output 3064 is now documented to possibly output D values other than 0 or 1. 3065 3066 zdump -c's treatment of years is now documented to use the 3067 Gregorian calendar and Universal Time without leap seconds, 3068 and its behavior at cutoff boundaries is now documented better. 3069 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 3070 3071 Programs are now documented to use the proleptic Gregorian calendar. 3072 (Thanks to Alan Barrett for the suggestion.) 3073 3074 Fractional-second GMT offsets have been documented for civil time 3075 in 19th-century Chennai, Jakarta, and New York. 3076 3077 3078 Release 2014g - 2014-08-28 12:31:23 -0700 3079 3080 Changes affecting future timestamps 3081 3082 Turks & Caicos is switching from US eastern time to UT -04 3083 year-round, modeled as a switch on 2014-11-02 at 02:00. 3084 [As noted in 2014j, this switch was later delayed.] 3085 3086 Changes affecting past timestamps 3087 3088 Time in Russia or the USSR before 1926 or so has been corrected by 3089 a few seconds in the following zones: Asia/Irkutsk, 3090 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 3091 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 3092 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 3093 Vladimir Karpinsky.) 3094 3095 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 3096 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 3097 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 3098 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 3099 (Thanks to Stephen Colebourne for pointing to the decree.) 3100 3101 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 3102 3103 A new file 'backzone' contains data which may appeal to 3104 connoisseurs of old timestamps, although it is out of scope for 3105 the tz database, is often poorly sourced, and contains some data 3106 that is known to be incorrect. The new file is not recommended 3107 for ordinary use and its entries are not installed by default. 3108 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 3109 Isle of Man entries.) 3110 3111 Some more zones have been turned into links, when they differed 3112 from existing zones only for older timestamps. As usual, 3113 these changes affect UT offsets in pre-1970 timestamps only. 3114 Their old contents have been moved to the 'backzone' file. 3115 The affected zones are: Africa/Bangui, Africa/Brazzaville, 3116 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 3117 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 3118 3119 Changes affecting code 3120 3121 Unless NETBSD_INSPIRED is defined to 0, the tz library now 3122 supplies functions for creating and using objects that represent 3123 timezones. The new functions are tzalloc, tzfree, localtime_rz, 3124 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 3125 time2posix_z. They are intended for performance: for example, 3126 localtime_rz (unlike localtime_r) is trivially thread-safe without 3127 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 3128 functions, and to Alan Barrett and Jonathan Lennox for helping to 3129 debug the change.) 3130 3131 zdump now builds with the tz library unless USE_LTZ is defined to 0, 3132 This lets zdump use tz features even if the system library lacks them. 3133 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 3134 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 3135 3136 zdump now uses localtime_rz if available, as it's significantly faster, 3137 and it can help zdump better diagnose invalid timezone names. 3138 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 3139 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 3140 not available, zdump now uses localtime_r and tzset if available, 3141 as this is a bit cleaner and faster than plain localtime. Compile 3142 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 3143 lacks these two functions. 3144 3145 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 3146 Although not needed for tz's own applications, which are single-threaded, 3147 this supports POSIX better if the tz library is used in multithreaded apps. 3148 3149 Some crashes have been fixed when zdump or the tz library is given 3150 invalid or outlandish input. 3151 3152 The tz library no longer mishandles leap seconds on platforms with 3153 unsigned time_t in timezones that lack ordinary transitions after 1970. 3154 3155 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 3156 already defined, to make it easier to configure on common platforms. 3157 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 3158 3159 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 3160 assumes that reading uninitialized memory yields garbage values 3161 but does not cause other problems such as traps. 3162 3163 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 3164 more likely to guess right for ambiguous timestamps near 3165 transitions where tm_isdst does not change. 3166 3167 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 3168 strftime_l for compatibility with recent versions of POSIX. 3169 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 3170 to 1 on recent POSIX versions, and to 0 otherwise. 3171 3172 tzselect -c now uses a hybrid distance measure that works better 3173 in Africa. (Thanks to Alan Barrett for noting the problem.) 3174 3175 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 3176 or when time_tz is defined. 3177 3178 When HAVE_UTMPX_H is set the 'date' command now builds on systems 3179 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 3180 the date it updates the wtmpx file if _PATH_WTMPX is defined. 3181 This affects GNU/Linux and similar systems. 3182 3183 For easier maintenance later, some C code has been simplified, 3184 some lint has been removed, and the code has been tweaked so that 3185 plain 'make' is more likely to work. 3186 3187 The C type 'bool' is now used for boolean values, instead of 'int'. 3188 3189 The long-obsolete LOCALE_HOME code has been removed. 3190 3191 The long-obsolete 'gtime' function has been removed. 3192 3193 Changes affecting build procedure 3194 3195 'zdump' no longer links in ialloc.o, as it's not needed. 3196 3197 'make check_time_t_alternatives' no longer assumes GNU diff. 3198 3199 Changes affecting distribution tarballs 3200 3201 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 3202 the tzdata tarball instead of the tzcode tarball, since they help 3203 maintain the data. The NEWS and Theory files are now also 3204 distributed in the tzdata tarball, as they're relevant for data. 3205 (Thanks to Alan Barrett for pointing this out.) Also, the 3206 leapseconds.awk file is no longer distributed in the tzcode 3207 tarball, since it belongs in the tzdata tarball (where 2014f 3208 inadvertently also distributed it). 3209 3210 Changes affecting documentation and commentary 3211 3212 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 3213 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 3214 for debugging it.) 3215 3216 The man pages have been updated to use function prototypes, 3217 to document thread-safe variants like localtime_r, and to document 3218 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 3219 mktime_z. 3220 3221 The fields in Link lines have been renamed to be more descriptive 3222 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 3223 and LINK-TO has become LINK-NAME. 3224 3225 tz-link.htm mentions the IETF's tzdist working group; Windows 3226 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 3227 3228 Some broken URLs have been fixed in the commentary. (Thanks to 3229 Lester Caine.) 3230 3231 Commentary about Philippines DST has been updated, and commentary 3232 on pre-1970 time in India has been added. 3233 3234 3235 Release 2014f - 2014-08-05 17:42:36 -0700 3236 3237 Changes affecting future timestamps 3238 3239 Russia will subtract an hour from most of its time zones on 2014-10-26 3240 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 3241 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 3242 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 3243 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 3244 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 3245 (Europe/Samara) are not changing their clocks. The changed zones are 3246 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 3247 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 3248 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 3249 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 3250 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 3251 but not its UTC offset. Two zones are added: Asia/Chita (split 3252 from Asia/Yakutsk, and also with two hours subtracted) and 3253 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 3254 subtracted). (Thanks to Tim Parenti for much of the above.) 3255 3256 Changes affecting time zone abbreviations 3257 3258 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 3259 and similarly for the other Australian zones. That is, for eastern 3260 standard and daylight saving time the abbreviations are AEST and AEDT 3261 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 3262 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 3263 This change does not affect UT offsets, only time zone abbreviations. 3264 (Thanks to Rich Tibbett and many others.) 3265 3266 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 3267 effective 2014-10-26 at 02:00 local time. 3268 3269 The time zone abbreviation for Xinjiang Time (observed in rmqi) 3270 has been changed from URUT to XJT. (Thanks to Luther Ma.) 3271 3272 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 3273 Similarly, prefer EET/EEST for eastern European time in Russia. 3274 3275 Change time zone abbreviations in (western) Samoa to use "ST" and 3276 "DT" suffixes, as this is more likely to match common practice. 3277 Prefix "W" to (western) Samoa time when its standard-time offset 3278 disagrees with that of American Samoa. 3279 3280 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 3281 3282 Time zone abbreviations have been updated for Japan's two time 3283 zones used 1896-1937. JWST now stands for Western Standard 3284 Time, and JCST for Central Standard Time (formerly this was CJT). 3285 These abbreviations are now used for time in Korea, Taiwan, 3286 and Sakhalin while controlled by Japan. 3287 3288 Changes affecting past timestamps 3289 3290 China's five zones have been simplified to two, since the post-1970 3291 differences in the other three seem to have been imaginary. The 3292 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 3293 removed; backwards-compatibility links still work, albeit with 3294 different behaviors for timestamps before May 1980. Asia/Urumqi's 3295 1980 transition to UT +08 has been removed, so that it is now at 3296 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 3297 Treindl sent helpful translations of two papers by Guo Qingsheng.) 3298 3299 Some zones have been turned into links, when they differed from existing 3300 zones only for older UT offsets where data entries were likely invented. 3301 These changes affect UT offsets in pre-1970 timestamps only. This is 3302 similar to the change in release 2013e, except this time for western 3303 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 3304 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 3305 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 3306 Atlantic/St_Helena. This also affects the backwards-compatibility 3307 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 3308 Tim Parenti, and David Patte for reporting problems in earlier 3309 versions of this change.) 3310 3311 Asia/Shanghai's pre-standard-time UT offset has been changed from 3312 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 3313 transition to standard time has been changed from 1928 to 1901. 3314 3315 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 3316 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 3317 In 1946 it observed DST from 05-15 through 09-30; in 1947 3318 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 3319 (Thanks to Yu-Cheng Chuang.) 3320 3321 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 3322 3323 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 3324 10-03 at 00:00. (Thanks to Konstantin Hyppnen.) 3325 3326 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 3327 period from 1911 to 1950. 3328 3329 Pacific/Chatham has been changed to New Zealand standard time plus 3330 45 minutes for the period before 1957, reflecting a 1956 remark in 3331 the New Zealand parliament. 3332 3333 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 3334 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 3335 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 3336 not 04-06 at 02:00; and there was no DST in 1920. 3337 3338 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 3339 3340 Time in Russia before 1927 or so has been corrected by a few seconds in 3341 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 3342 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 3343 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 3344 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 3345 3346 Changes affecting data format 3347 3348 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 3349 The new file's extended format allows multiple country codes per zone. 3350 The older file is still installed but is deprecated; its format is 3351 not changing and it will still be distributed for a while, but new 3352 applications should use the new file. 3353 3354 The new file format simplifies maintenance of obscure locations. 3355 To test this, it adds coverage for the Crozet Islands and the 3356 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 3357 3358 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 3359 It is still ASCII now, but commentary about the switch has been added. 3360 The new file 'zone1970.tab' already uses UTF-8. 3361 3362 Changes affecting code 3363 3364 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 3365 is defined. (Thanks to Elliott Hughes for reporting the problem.) 3366 3367 'zic' no longer mishandles input when ignoring case in locales that 3368 are not compatible with English, e.g., unibyte Turkish locales when 3369 compiled with HAVE_GETTEXT. 3370 3371 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 3372 they no longer use ASCII '-' as if it were a dash. 3373 3374 'zic' now rejects output file names that contain '.' or '..' components. 3375 (Thanks to Tim Parenti for reporting the problem.) 3376 3377 'zic -v' now warns about output file names that do not follow 3378 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 3379 David Olson for starting the ball rolling on this.) 3380 3381 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 3382 3383 Changes affecting build procedure 3384 3385 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 3386 (Thanks to John Cochran.) 3387 3388 Changes affecting documentation and commentary 3389 3390 The 'Theory' file documents legacy names, the longstanding 3391 exceptions to the POSIX-inspired file name rules. 3392 3393 The 'zic' documentation clarifies the role of time types when 3394 interpreting dates. (Thanks to Arthur David Olson.) 3395 3396 Documentation and commentary now prefer UTF-8 to US-ASCII, 3397 allowing the use of proper accents in foreign words and names. 3398 Code and data have not changed because of this. (Thanks to 3399 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 3400 this.) 3401 3402 Non-HTML documentation and commentary now use plain-text URLs instead of 3403 HTML insertions, and are more consistent about bracketing URLs when they 3404 are not already surrounded by white space. (Thanks to suggestions by 3405 Steffen Nurpmeso.) 3406 3407 There is new commentary about Xujiahui Observatory, the five time-zone 3408 project in China from 1918 to 1949, timekeeping in Japanese-occupied 3409 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 3410 warlord Jin Shuren in the data. 3411 3412 Commentary about the coverage of each Russian zone has been standardized. 3413 (Thanks to Tim Parenti.) 3414 3415 There is new commentary about contemporary timekeeping in Ethiopia. 3416 3417 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 3418 3419 There is new commentary about time in Poland in 1919. 3420 3421 Proper credit has been given to DST inventor George Vernon Hudson. 3422 3423 Commentary about time in Metlakatla, AK and Resolute, NU has been 3424 improved, with a new source for the former. 3425 3426 In zone.tab, Pacific/Easter no longer mentions Salas y Gmez, as it 3427 is uninhabited. 3428 3429 Commentary about permanent Antarctic bases has been updated. 3430 3431 Several typos have been corrected. (Thanks to Tim Parenti for 3432 contributing some of these fixes.) 3433 3434 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 3435 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 3436 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 3437 (Thanks to a heads-up from Dirkjan Ochtman.) 3438 3439 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 3440 have been removed. These obsolescent US Naval Observatory entries were no 3441 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 3442 3443 3444 Release 2014e - 2014-06-12 21:53:52 -0700 3445 3446 Changes affecting near-future timestamps 3447 3448 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 3449 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 3450 switch to standard time at 24:00 the last Thursday before Ramadan, and 3451 back to DST at 00:00 the first Friday after Ramadan. 3452 3453 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 3454 to Milamber Space Network.) Guess that from 2015 on Morocco will 3455 temporarily switch to standard time at 03:00 the last Saturday before 3456 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 3457 3458 Changes affecting past timestamps 3459 3460 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 3461 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 3462 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 3463 in 1991. (Thanks to Hank W. for reporting the problems.) 3464 3465 Changes affecting commentary 3466 3467 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 3468 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 3469 removes stale pointers to World Time Explorer and WORLDTIME. 3470 3471 3472 Release 2014d - 2014-05-27 21:34:40 -0700 3473 3474 Changes affecting code 3475 3476 zic no longer generates files containing timestamps before the Big Bang. 3477 This works around GNOME glib bug 878 3478 <https://gitlab.gnome.org/GNOME/glib/issues/878> 3479 (Thanks to Leonardo Chiquitto for reporting the bug, and to 3480 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 3481 3482 Changes affecting documentation 3483 3484 tz-link.htm now mentions GNOME. 3485 3486 3487 Release 2014c - 2014-05-13 07:44:13 -0700 3488 3489 Changes affecting near-future timestamps 3490 3491 Egypt observes DST starting 2014-05-15 at 24:00. 3492 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 3493 Details have not been announced, except that DST will not be observed 3494 during Ramadan. Guess that DST will stop during the same Ramadan dates as 3495 Morocco, and that Egypt's future spring and fall transitions will be the 3496 same as 2010 when it last observed DST, namely April's last Friday at 3497 00:00 to September's last Thursday at 23:00 standard time. Also, guess 3498 that Ramadan transitions will be at 00:00 standard time. 3499 3500 Changes affecting code 3501 3502 zic now generates transitions for minimum time values, eliminating guesswork 3503 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 3504 3505 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 3506 3507 Changes affecting commentary and documentation 3508 3509 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 3510 3511 3512 Release 2014b - 2014-03-24 21:28:50 -0700 3513 3514 Changes affecting near-future timestamps 3515 3516 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 3517 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 3518 3519 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 3520 Bengt-Inge Larsson.) This is currently an approximation; a better version 3521 will require the zic and localtime fixes mentioned below, and the plan is 3522 to wait for a while until at least the zic fixes propagate. 3523 3524 Changes affecting code 3525 3526 'zic' and 'localtime' no longer reject locations needing four transitions 3527 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 3528 Also, 'zic' avoids some unlikely failures due to integer overflow. 3529 3530 Changes affecting build procedure 3531 3532 'make check' now detects Rule lines defined but never used. 3533 The NZAQ rules, an instance of this problem, have been removed. 3534 3535 Changes affecting commentary and documentation 3536 3537 Fix Tuesday/Thursday typo in description of time in Israel. 3538 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 3539 3540 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 3541 to Donald MacQueen.) Instead, the Microsoft Windows Store app 3542 library supports them. 3543 3544 Add comments about Johnston Island time in the 1960s. 3545 (Thanks to Lyle McElhaney.) 3546 3547 Morocco's 2014 DST start will be as predicted. 3548 (Thanks to Sebastien Willemijns.) 3549 3550 3551 Release 2014a - 2014-03-07 23:30:29 -0800 3552 3553 Changes affecting near-future timestamps 3554 3555 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 3556 the heads-up, and to Tim Parenti for simplifying the update.) 3557 3558 Changes affecting past timestamps 3559 3560 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00. 3561 (Thanks to Steffen Thorsen.) 3562 3563 Ukraine switched from Moscow to Eastern European time on 1990-07-01 3564 (not 1992-01-01), and observed DST during the entire next winter. 3565 (Thanks to Vladimir in Moscow via Alois Treindl.) 3566 3567 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 3568 (Thanks to Avigdor Finkelstein.) 3569 3570 Changes affecting code 3571 3572 A uninitialized-storage bug in 'localtime' has been fixed. 3573 (Thanks to Logan Chien.) 3574 3575 Changes affecting the build procedure 3576 3577 The settings for 'make check_web' now default to Ubuntu 13.10. 3578 3579 Changes affecting commentary and documentation 3580 3581 The boundary of the US Pacific time zone is given more accurately. 3582 (Thanks to Alan Mintz.) 3583 3584 Chile's 2014 DST will be as predicted. (Thanks to Jos Miguel Garrido.) 3585 3586 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Ral Perasso.) 3587 3588 Better descriptions of countries with same time zone history as 3589 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 3590 3591 Several changes affect tz-link.htm, the main web page. 3592 3593 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 3594 David Braverman). 3595 3596 Mention xCal (Internet RFC 6321) and jCal. 3597 3598 Microsoft has some support for tz database names. 3599 3600 CLDR data formats include both XML and JSON. 3601 3602 Mention Maggiolo's map of solar vs standard time. 3603 (Thanks to Arthur David Olson.) 3604 3605 Mention TZ4Net. (Thanks to Matt Johnson.) 3606 3607 Mention the timezone-olson Haskell package. 3608 3609 Mention zeitverschiebung.net. (Thanks to Martin Jger.) 3610 3611 Remove moribund links to daylight-savings-time.info and to 3612 Simple Timer + Clocks. 3613 3614 Update two links. (Thanks to Oscar van Vlijmen.) 3615 3616 Fix some formatting glitches, e.g., remove random newlines from 3617 abbr elements' title attributes. 3618 3619 3620 Release 2013i - 2013-12-17 07:25:23 -0800 3621 3622 Changes affecting near-future timestamps: 3623 3624 Jordan switches back to standard time at 00:00 on December 20, 2013. 3625 The 2006-2011 transition schedule is planned to resume in 2014. 3626 (Thanks to Steffen Thorsen.) 3627 3628 Changes affecting past timestamps: 3629 3630 In 2004, Cuba began DST on March 28, not April 4. 3631 (Thanks to Steffen Thorsen.) 3632 3633 Changes affecting code 3634 3635 The compile-time flag NOSOLAR has been removed, as nowadays the 3636 benefit of slightly shrinking runtime table size is outweighed by the 3637 cost of disallowing potential future updates that exceed old limits. 3638 3639 Changes affecting documentation and commentary 3640 3641 The files solar87, solar88, and solar89 are no longer distributed. 3642 They were a negative experiment - that is, a demonstration that 3643 tz data can represent solar time only with some difficulty and error. 3644 Their presence in the distribution caused confusion, as Riyadh 3645 civil time was generally not solar time in those years. 3646 3647 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 3648 3649 3650 Release 2013h - 2013-10-25 15:32:32 -0700 3651 3652 Changes affecting current and future timestamps: 3653 3654 Libya has switched its UT offset back to +02 without DST, instead 3655 of +01 with DST. (Thanks to Even Scharning.) 3656 3657 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 3658 (Thanks to Gwillim Law.) 3659 3660 Changes affecting future timestamps: 3661 3662 Acre and (we guess) western Amazonas will switch from UT -04 to -05 3663 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 3664 (Thanks to Steffen Thorsen.) 3665 3666 Add entries for DST transitions in Morocco in the year 2038. 3667 This avoids some year-2038 glitches introduced in 2013g. 3668 (Thanks to Yoshito Umaoka for reporting the problem.) 3669 3670 Changes affecting API 3671 3672 The 'tzselect' command no longer requires the 'select' command, 3673 and should now work with /bin/sh on more platforms. It also works 3674 around a bug in BusyBox awk before version 1.21.0. (Thanks to 3675 Patrick 'P. J.' McDermott and Alan Barrett.) 3676 3677 Changes affecting code 3678 3679 Fix localtime overflow bugs with 32-bit unsigned time_t. 3680 3681 zdump no longer assumes sscanf returns maximal values on overflow. 3682 3683 Changes affecting the build procedure 3684 3685 The builder can specify which programs to use, if any, instead of 3686 'ar' and 'ranlib', and libtz.a is now built locally before being 3687 installed. (Thanks to Michael Forney.) 3688 3689 A dependency typo in the 'zdump' rule has been fixed. 3690 (Thanks to Andrew Paprocki.) 3691 3692 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 3693 work as specified by POSIX.2-1992 or later; this is portable nowadays. 3694 3695 'make clean' no longer removes 'leapseconds', since it's 3696 host-independent and is part of the distribution. 3697 3698 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 3699 3700 Changes affecting documentation and commentary 3701 3702 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 3703 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 3704 3705 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 3706 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 3707 longer maintained) and for old advisories. SOFA now does C. 3708 3709 Release 2013g - 2013-09-30 21:08:26 -0700 3710 3711 Changes affecting current and near-future timestamps 3712 3713 Morocco now observes DST from the last Sunday in March to the last 3714 Sunday in October, not April to September respectively. (Thanks 3715 to Steffen Thorsen.) 3716 3717 Changes affecting 'zic' 3718 3719 'zic' now runs on platforms that lack both hard links and symlinks. 3720 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 3721 Also, fix some bugs on platforms that lack hard links but have symlinks. 3722 3723 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 3724 to predict the far future, fixing a bug introduced in 2013e. 3725 3726 Changes affecting the build procedure 3727 3728 The 'leapseconds' file is again put into the tzdata tarball. 3729 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 3730 Matt Burgess and Ian Abbott.) The timestamps of these and other 3731 dependent files in tarballs are adjusted more consistently. 3732 3733 Changes affecting documentation and commentary 3734 3735 The README file is now part of the data tarball as well as the code. 3736 It now states that files are public domain unless otherwise specified. 3737 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 3738 Its details about the 1989 release moved to a place of honor near 3739 the end of NEWS. 3740 3741 3742 Release 2013f - 2013-09-24 23:37:36 -0700 3743 3744 Changes affecting near-future timestamps 3745 3746 Tocantins will very likely not observe DST starting this spring. 3747 (Thanks to Steffen Thorsen.) 3748 3749 Jordan will likely stay at UT +03 indefinitely, and will not fall 3750 back this fall. 3751 3752 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 3753 3754 Changes affecting API 3755 3756 The types of the global variables 'timezone' and 'altzone' (if present) 3757 have been changed back to 'long'. This is required for 'timezone' 3758 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 3759 These variables were originally 'long' in the tz code, but were 3760 mistakenly changed to 'time_t' in 1987; nobody reported the 3761 incompatibility until now. The difference matters on x32, where 3762 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 3763 3764 Changes affecting the build procedure 3765 3766 Avoid long strings in leapseconds.awk to work around a mawk bug. 3767 (Thanks to Cyril Baurand.) 3768 3769 Changes affecting documentation and commentary 3770 3771 New file 'NEWS' that contains release notes like this one. 3772 3773 Paraguay's law does not specify DST transition time; 00:00 is customary. 3774 (Thanks to Waldemar Villamayor-Venialbo.) 3775 3776 Minor capitalization fixes. 3777 3778 Changes affecting version-control only 3779 3780 The experimental GitHub repository now contains annotated and 3781 signed tags for recent releases, e.g., '2013e' for Release 2013e. 3782 Releases are tagged starting with 2012e; earlier releases were 3783 done differently, and tags would either not have a simple name or 3784 not exactly match what was released. 3785 3786 'make set-timestamps' is now simpler and a bit more portable. 3787 3788 3789 Release 2013e - 2013-09-19 23:50:04 -0700 3790 3791 Changes affecting near-future timestamps 3792 3793 This year Fiji will start DST on October 27, not October 20. 3794 (Thanks to David Wheeler for the heads-up.) For now, guess that 3795 Fiji will continue to spring forward the Sunday before the fourth 3796 Monday in October. 3797 3798 Changes affecting current and future time zone abbreviations 3799 3800 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 3801 time zone abbreviations since 1932. (Thanks to George Ziegler, 3802 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 3803 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 3804 Asia/Makassar, and Asia/Pontianak. 3805 3806 Use ART (UT -03, standard time), rather than WARST (also -03, but 3807 daylight saving time) for San Luis, Argentina since 2009. 3808 3809 Changes affecting Godthb timestamps after 2037 if version mismatch 3810 3811 Allow POSIX-like TZ strings where the transition time's hour can 3812 range from -167 through 167, instead of the POSIX-required 0 3813 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 3814 new Fiji rules. This is a more-compact way to represent 3815 far-future timestamps for America/Godthab, America/Santiago, 3816 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 3817 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 3818 this change. (Derived from a suggestion by Arthur David Olson.) 3819 3820 Allow POSIX-like TZ strings where daylight saving time is in 3821 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 3822 Argentina Summer Time all year. This supports a more-compact way 3823 to represent the 2013d data for America/Argentina/San_Luis. 3824 Because of the change for San Luis noted above this change does not 3825 affect the current data. (Thanks to Andrew Main (Zefram) for 3826 suggestions that improved this change.) 3827 3828 Where these two TZ changes take effect, there is a minor extension 3829 to the tz file format in that it allows new values for the 3830 embedded TZ-format string, and the tz file format version number 3831 has therefore been increased from 2 to 3 as a precaution. 3832 Version-2-based client code should continue to work as before for 3833 all timestamps before 2038. Existing version-2-based client code 3834 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 3835 files, and typically works in practice even for timestamps after 3836 2037; the only known exception is America/Godthab. 3837 3838 Changes affecting timestamps before 1970 3839 3840 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 3841 some errors before 1947. 3842 3843 Some zones have been turned into links, when they differ from existing 3844 zones only in older data entries that were likely invented or that 3845 differ only in LMT or transitions from LMT. These changes affect 3846 only timestamps before 1943. The affected zones are: 3847 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 3848 America/Grenada, America/Guadeloupe, America/Marigot, 3849 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 3850 America/St_Lucia, America/St_Thomas, America/St_Vincent, 3851 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 3852 confirming that the old Europe/Vaduz zone was wrong and the new 3853 link is better for WWII-era times.) 3854 3855 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 3856 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 3857 from 1890 to 1912. 3858 3859 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 3860 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 3861 to Alois Treindl.) 3862 3863 Change the date of the circa-1850 Zurich transition from 1849-09-12 3864 to 1853-07-16, overriding Shanks with data from Messerli about 3865 postal and telegraph time in Switzerland. 3866 3867 Changes affecting time zone abbreviations before 1970 3868 3869 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 3870 as Jakarta was called Batavia back then. 3871 3872 Changes affecting API 3873 3874 The 'zic' command now outputs a dummy transition when far-future 3875 data can't be summarized using a TZ string, and uses a 402-year 3876 window rather than a 400-year window. For the current data, this 3877 affects only the Asia/Tehran file. It does not affect any of the 3878 timestamps that this file represents, so zdump outputs the same 3879 information as before. (Thanks to Andrew Main (Zefram).) 3880 3881 The 'date' command has a new '-r' option, which lets you specify 3882 the integer time to display, a la FreeBSD. 3883 3884 The 'tzselect' command has two new options '-c' and '-n', which lets you 3885 select a zone based on latitude and longitude. 3886 3887 The 'zic' command's '-v' option now warns about constructs that 3888 require the new version-3 binary file format. (Thanks to Arthur 3889 David Olson for the suggestion.) 3890 3891 Support for floating-point time_t has been removed. 3892 It was always dicey, and POSIX no longer requires it. 3893 (Thanks to Eric Blake for suggesting to the POSIX committee to 3894 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 3895 Heninger, Arthur David Olson, and Alois Treindl, for reporting 3896 bugs and elucidating some of the corners of the old floating-point 3897 implementation.) 3898 3899 The signatures of 'offtime', 'timeoff', and 'gtime' have been 3900 changed back to the old practice of using 'long' to represent UT 3901 offsets. This had been inadvertently and mistakenly changed to 3902 'int_fast32_t'. (Thanks to Christos Zoulas.) 3903 3904 The code avoids undefined behavior on integer overflow in some 3905 more places, including gmtime, localtime, mktime and zdump. 3906 3907 Changes affecting the zdump utility 3908 3909 zdump now outputs "UT" when referring to Universal Time, not "UTC". 3910 "UTC" does not make sense for timestamps that predate the introduction 3911 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen 3912 for clarifying UT vs UTC.) 3913 3914 Data changes affecting behavior of tzselect and similar programs 3915 3916 Country code BQ is now called the more-common name "Caribbean Netherlands" 3917 rather than the more-official "Bonaire, St Eustatius & Saba". 3918 3919 Remove from zone.tab the names America/Montreal, America/Shiprock, 3920 and Antarctica/South_Pole, as they are equivalent to existing 3921 same-country-code zones for post-1970 timestamps. The data entries for 3922 these names are unchanged, so the names continue to work as before. 3923 3924 Changes affecting code internals 3925 3926 zic -c now runs way faster on 64-bit hosts when given large numbers. 3927 3928 zic now uses vfprintf to avoid allocating and freeing some memory. 3929 3930 tzselect now computes the list of continents from the data, 3931 rather than have it hard-coded. 3932 3933 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 3934 3935 Changes affecting the build procedure 3936 3937 The 'leapseconds' file is now generated automatically from a 3938 new file 'leap-seconds.list', which is a copy of 3939 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 3940 A new source file 'leapseconds.awk' implements this. 3941 The goal is simplification of the future maintenance of 'leapseconds'. 3942 3943 When building the 'posix' or 'right' subdirectories, if the 3944 subdirectory would be a copy of the default subdirectory, it is 3945 now made a symbolic link if that is supported. This saves about 3946 2 MB of file system space. 3947 3948 The links America/Shiprock and Antarctica/South_Pole have been 3949 moved to the 'backward' file. This affects only nondefault builds 3950 that omit 'backward'. 3951 3952 Changes affecting version-control only 3953 3954 .gitignore now ignores 'date'. 3955 3956 Changes affecting documentation and commentary 3957 3958 Changes to the 'tzfile' man page 3959 3960 It now mentions that the binary file format may be extended in 3961 future versions by appending data. 3962 3963 It now refers to the 'zdump' and 'zic' man pages. 3964 3965 Changes to the 'zic' man page 3966 3967 It lists conditions that elicit a warning with '-v'. 3968 3969 It says that the behavior is unspecified when duplicate names 3970 are given, or if the source of one link is the target of another. 3971 3972 Its examples are updated to match the latest data. 3973 3974 The definition of white space has been clarified slightly. 3975 (Thanks to Michael Deckers.) 3976 3977 Changes to the 'Theory' file 3978 3979 There is a new section about the accuracy of the tz database, 3980 describing the many ways that errors can creep in, and 3981 explaining why so many of the pre-1970 timestamps are wrong or 3982 misleading (thanks to Steve Allen, Lester Caine, and Garrett 3983 Wollman for discussions that contributed to this). 3984 3985 The 'Theory' file describes LMT better (this follows a 3986 suggestion by Guy Harris). 3987 3988 It refers to the 2013 edition of POSIX rather than the 2004 edition. 3989 3990 It's mentioned that excluding 'backward' should not affect the 3991 other data, and it suggests at least one zone.tab name per 3992 inhabited country (thanks to Stephen Colebourne). 3993 3994 Some longstanding restrictions on names are documented, e.g., 3995 'America/New_York' precludes 'America/New_York/Bronx'. 3996 3997 It gives more reasons for the 1970 cutoff. 3998 3999 It now mentions which time_t variants are supported, such as 4000 signed integer time_t. (Thanks to Paul Goyette for reporting 4001 typos in an experimental version of this change.) 4002 4003 (Thanks to Philip Newton for correcting typos in these changes.) 4004 4005 Documentation and commentary is more careful to distinguish UT in 4006 general from UTC in particular. (Thanks to Steve Allen.) 4007 4008 Add a better source for the Zurich 1894 transition. 4009 (Thanks to Pierre-Yves Berger.) 4010 4011 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 4012 4013 4014 Release 2013d - 2013-07-05 07:38:01 -0700 4015 4016 Changes affecting future timestamps: 4017 4018 Morocco's midsummer transitions this year are July 7 and August 10, 4019 not July 9 and August 8. (Thanks to Andrew Paprocki.) 4020 4021 Israel now falls back on the last Sunday of October. 4022 (Thanks to Ephraim Silverberg.) 4023 4024 Changes affecting past timestamps: 4025 4026 Specify Jerusalem's location more precisely; this changes the pre-1880 4027 times by 2 s. 4028 4029 Changing affecting metadata only: 4030 4031 Fix typos in the entries for country codes BQ and SX. 4032 4033 Changes affecting code: 4034 4035 Rework the code to fix a bug with handling Australia/Macquarie on 4036 32-bit hosts (thanks to Arthur David Olson). 4037 4038 Port to platforms like NetBSD, where time_t can be wider than long. 4039 4040 Add support for testing time_t types other than the system's. 4041 Run 'make check_time_t_alternatives' to try this out. 4042 Currently, the tests fail for unsigned time_t; 4043 this should get fixed at some point. 4044 4045 Changes affecting documentation and commentary: 4046 4047 Deemphasize the significance of national borders. 4048 4049 Update the zdump man page. 4050 4051 Remove obsolete NOID comment (thanks to Denis Excoffier). 4052 4053 Update several URLs and comments in the web pages. 4054 4055 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 4056 4057 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 4058 4059 4060 Release 2013c - 2013-04-19 16:17:40 -0700 4061 4062 Changes affecting current and future timestamps: 4063 4064 Palestine observed DST starting March 29, 2013. (Thanks to 4065 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 4066 with the predicted rules being the last Thursday in March at 24:00 4067 to the first Friday on or after September 21 at 01:00. 4068 4069 Assume that the recent change to Paraguay's DST rules is permanent, 4070 by moving the end of DST to the 4th Sunday in March every year. 4071 (Thanks to Carlos Ral Perasso.) 4072 4073 Changes affecting past timestamps: 4074 4075 Fix some historical data for Palestine to agree with that of 4076 timeanddate.com, as follows: 4077 4078 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 4079 00:00 Apr 1. 4080 4081 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 4082 02:00. 4083 4084 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 4085 4086 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 4087 4088 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 4089 4090 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 4091 4092 Fix times of habitation for Macquarie to agree with the Tasmania 4093 Parks & Wildlife Service history, which indicates that permanent 4094 habitation was 1899-1919 and 1948 on. 4095 4096 Changing affecting metadata only: 4097 4098 Macquarie Island is politically part of Australia, not Antarctica. 4099 (Thanks to Tobias Conradi.) 4100 4101 Sort Macquarie more-consistently with other parts of Australia. 4102 (Thanks to Tim Parenti.) 4103 4104 4105 Release 2013b - 2013-03-10 22:33:40 -0700 4106 4107 Changes affecting current and future timestamps: 4108 4109 Haiti uses US daylight-saving rules this year, and presumably future years. 4110 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 4111 4112 Paraguay will end DST on March 24 this year. 4113 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 4114 4115 Morocco does not observe DST during Ramadan; 4116 try to predict Ramadan in Morocco as best we can. 4117 (Thanks to Erik Homoet for the heads-up.) 4118 4119 Changes affecting commentary: 4120 4121 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 4122 Update URL for Solaris. Mention Internet RFC 6557. 4123 Update Internet RFCs 2445->5545, 2822->5322. 4124 Switch from FTP to HTTP for Internet RFCs. 4125 4126 4127 Release 2013a - 2013-02-27 09:20:35 -0800 4128 4129 Change affecting binary data format: 4130 4131 The zone offset at the end of version-2-format zone files is now 4132 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 4133 4134 Changes affecting current and future timestamps: 4135 4136 Chile's 2013 rules, and we guess rules for 2014 and later, will be 4137 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 4138 (Thanks to Steffen Thorsen and Robert Elz.) 4139 4140 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 4141 (Thanks to Tobias Conradi and Arthur David Olson.) 4142 4143 Many changes affect historical timestamps before 1940. 4144 These were deduced from: Milne J. Civil time. Geogr J. 1899 4145 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 4146 4147 Changes affecting the code: 4148 4149 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 4150 the data). (Thanks to Arthur David Olson.) 4151 4152 Fix localtime bug when time_t is unsigned and data files were generated 4153 by a signed time_t system. (Thanks to Doug Bailey for reporting and 4154 to Arthur David Olson for fixing.) 4155 4156 Allow the email address for bug reports to be set by the packager. 4157 The default is tz (a] iana.org, as before. (Thanks to Joseph S. Myers.) 4158 4159 Update HTML checking to be compatible with Ubuntu 12.10. 4160 4161 Check that files are a safe subset of ASCII. At some point we may 4162 relax this requirement to a safe subset of UTF-8. Without the 4163 check, some non-UTF-8 encodings were leaking into the distribution. 4164 4165 Commentary changes: 4166 4167 Restore a comment about copyright notices that was inadvertently deleted. 4168 (Thanks to Arthur David Olson.) 4169 4170 Improve the commentary about which districts observe what times 4171 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 4172 4173 Add web page links to tz.js. 4174 4175 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 4176 4177 4178 Release 2012j - 2012-11-12 18:34:49 -0800 4179 4180 Libya moved to CET this weekend, but with DST planned next year. 4181 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 4182 4183 Signatures now have the extension .asc, not .sign, as that's more 4184 standard. (Thanks to Phil Pennock.) 4185 4186 The output of 'zdump --version', and of 'zic --version', now 4187 uses a format that is more typical for --version. 4188 (Thanks to Joseph S. Myers.) 4189 4190 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 4191 now uses tz (a] iana.org rather than the old elsie address. 4192 4193 zic -v now complains about abbreviations that are less than 3 4194 or more than 6 characters, as per Posix. Formerly, it checked 4195 for abbreviations that were more than 3. 4196 4197 'make public' no longer puts its temporary directory under /tmp, 4198 and uses the just-built zic rather than the system zic. 4199 4200 Various fixes to documentation and commentary. 4201 4202 4203 Release 2012i - 2012-11-03 12:57:09 -0700 4204 4205 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 4206 4207 Linker flags can now be specified via LDFLAGS. 4208 AWK now defaults to 'awk', not 'nawk'. 4209 The shell in tzselect now defaults to /bin/bash, but this can 4210 be overridden by specifying KSHELL. 4211 The main web page now mentions the unofficial GitHub repository. 4212 (Thanks to Mike Frysinger.) 4213 4214 Tarball signatures can now be built by running 'make signatures'. 4215 There are also new makefile rules 'tarballs', 'check_public', and 4216 separate makefile rules for each tarball and signature file. 4217 A few makefile rules are now more portable to strict POSIX. 4218 4219 The main web page now lists the canonical IANA URL. 4220 4221 4222 Release 2012h - 2012-10-26 22:49:10 -0700 4223 4224 Bahia no longer has DST. (Thanks to Kelley Cook.) 4225 4226 Tocantins has DST. (Thanks to Rodrigo Severo.) 4227 4228 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 4229 4230 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 4231 4232 Web page updates. 4233 4234 More C modernization, except that at Arthur David Olson's suggestion 4235 the instances of 'register' were kept. 4236 4237 4238 Release 2012g - 2012-10-17 20:59:45 -0700 4239 4240 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 4241 4242 Palestine fall 2012. (Thanks to Steffen Thorsen.) 4243 4244 Assume C89. 4245 4246 To attack the version-number problem, this release ships the file 4247 'Makefile' (which contains the release number) in both the tzcode and 4248 the tzdata tarballs. The two Makefiles are identical, and should be 4249 identical in any matching pair of tarballs, so it shouldn't matter 4250 which order you extract the tarballs. Perhaps we can come up with a 4251 better version-number scheme at some point; this scheme does have the 4252 virtue of not adding more files. 4253 4254 4255 Release 2012f - 2012-09-12 23:17:03 -0700 4256 4257 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 4258 20 this year. (Thanks to Steffen Thorsen.) 4259 4260 4261 Release 2012e - 2012-08-02 20:44:55 -0700 4262 4263 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 4264 (Thanks to Steffen Thorsen.) 4265 4266 * Use a single version number for both code and data. 4267 4268 * .gitignore: New file. 4269 4270 * Remove trailing white space. 4271 4272 4273 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 4274 4275 Changes for Morocco's timestamps, which take effect in a couple of 4276 hours, along with infrastructure changes to accommodate how the tz 4277 code and data are released on IANA. 4278 4279 4280 Release data2012c - 2012-03-27 12:17:25 -0400 4281 4282 africa 4283 Summer time changes for Morocco (to start late April 2012) 4284 4285 asia 4286 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 4287 4288 northamerica 4289 Haiti following US/Canada rules for 2012 (and we're assuming, 4290 for now anyway, for the future). 4291 4292 4293 Release 2012b - 2012-03-02 12:29:15 +0700 4294 4295 There is just one change to tzcode2012b (compared with 2012a): 4296 the Makefile that was accidentally included with 2012a has been 4297 replaced with the version that should have been there, which is 4298 identical with the previous version (from tzcode2011i). 4299 4300 There are just two changes in tzdata2012b compared with 2012a. 4301 4302 Most significantly, summer time in Cuba has been delayed 3 weeks 4303 (now starts April 1 rather than March 11). Since Mar 11 (the old start 4304 date, as listed in 2012a) is just a little over a week away, this 4305 change is urgent. 4306 4307 Less importantly, an excess tab in one of the changes in zone.tab 4308 in 2012a has been removed. 4309 4310 4311 Release 2012a - 2012-03-01 18:28:10 +0700 4312 4313 The changes in tzcode2012a (compared to the previous version, 2011i) 4314 are entirely to the README and tz-art.htm and tz-link.htm files, if 4315 none of those concern you, you can ignore the code update. The changes 4316 reflect the changed addresses for the mailing list and the code and 4317 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 4318 has been added to tz-link.htm). 4319 4320 In tzdata2012a (compared to the previous release, which was 2011n) 4321 the major changes are: 4322 Chile 2011/2012 and 2012/2013 summer time date adjustments. 4323 Falkland Islands onto permanent summer time (we're assuming for the 4324 foreseeable future, though 2012 is all we're fairly certain of.) 4325 Armenia has abolished Summer Time. 4326 Tokelau jumped the International Date Line back last December 4327 (just the same as their near neighbour, Samoa). 4328 America/Creston is a new zone for a small area of British Columbia 4329 There will be a leapsecond 2012-06-30 23:59:60 UTC. 4330 4331 Other minor changes are: 4332 Corrections to 1918 Canadian summer time end dates. 4333 Updated URL for UK time zone history (in comments) 4334 A few typos in Le Corre's list of free French place names (comments) 4335 4336 4337 Release data2011n - 2011-10-30 14:57:54 +0700 4338 4339 There are three changes of note - most urgently, Cuba (America/Havana) 4340 has extended summer time by two weeks, now to end on Nov 13, rather than 4341 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 4342 (Europe/Tiraspol) decided not to split from the rest of Moldova after 4343 all, and consequently that zone has been removed (again) and reinstated 4344 in the "backward" file as a link to Europe/Chisinau. And third, the 4345 end date for Fiji's summer time this summer was moved forward from the 4346 earlier planned Feb 26, to Jan 22. 4347 4348 Apart from that, Moldova (MD) returns to a single entry in zone.tab 4349 (and the incorrect syntax that was in the 2011m version of that file 4350 is so fixed - it would have been fixed in a different way had this 4351 change not happened - that's the "missing" sccs version id). 4352 4353 4354 Release data2011m - 2011-10-24 21:42:16 +0700 4355 4356 In particular, the typos in comments in the data (2011-11-17 should have 4357 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 4358 Tim Parenti noted) have been fixed, and the change for Ukraine has been 4359 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to 4360 Tim Parenti, and also Denys Gavrysh) 4361 4362 In addition, I added Europe/Tiraspol to zone.tab. 4363 4364 This time, all the files have new version numbers... (including the files 4365 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 4366 version numbers there...) 4367 4368 4369 Release data2011l - 2011-10-10 11:15:43 +0700 4370 4371 There are just 2 changes that cause different generated tzdata files from 4372 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 4373 is included, but commented out. Compared with the diff I sent out last week, 4374 this version also includes attributions for the sources for the changes 4375 (in much the same format as ado used, but the html tags have not been 4376 checked, verified, or used in any way at all, so if there are errors there, 4377 please let me know.) 4378 4379 4380 Release data2011k - 2011-09-20 17:54:03 -0400 4381 4382 [not summarized] 4383 4384 4385 Release data2011j - 2011-09-12 09:22:49 -0400 4386 4387 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 4388 Tanzania); there are also two spelling corrections to comments in 4389 the australasia file (with thanks to Christos Zoulas). 4390 4391 4392 Release 2011i - 2011-08-29 05:56:32 -0400 4393 4394 [not summarized] 4395 4396 4397 Release data2011h - 2011-06-15 18:41:48 -0400 4398 4399 Russia and Curaao changes 4400 4401 4402 Release 2011g - 2011-04-25 09:07:22 -0400 4403 4404 update the rules for Egypt to reflect its abandonment of DST this year 4405 4406 4407 Release 2011f - 2011-04-06 17:14:53 -0400 4408 4409 [not summarized] 4410 4411 4412 Release 2011e - 2011-03-31 16:04:38 -0400 4413 4414 Morocco, Chile, and tz-link changes 4415 4416 4417 Release 2011d - 2011-03-14 09:18:01 -0400 4418 4419 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 4420 4421 4422 Release 2011c - 2011-03-07 09:30:09 -0500 4423 4424 These do affect current timestamps in Chile and Annette Island, Canada. 4425 4426 4427 Release 2011b - 2011-02-07 08:44:50 -0500 4428 4429 [not summarized] 4430 4431 4432 Release 2011a - 2011-01-24 10:30:16 -0500 4433 4434 [not summarized] 4435 4436 4437 Release data2010o - 2010-11-01 09:18:23 -0400 4438 4439 change to the end of DST in Fiji in 2011 4440 4441 4442 Release 2010n - 2010-10-25 08:19:17 -0400 4443 4444 [not summarized] 4445 4446 4447 Release 2010m - 2010-09-27 09:24:48 -0400 4448 4449 Hong Kong, Vostok, and zic.c changes 4450 4451 4452 Release 2010l - 2010-08-16 06:57:25 -0400 4453 4454 [not summarized] 4455 4456 4457 Release 2010k - 2010-07-26 10:42:27 -0400 4458 4459 [not summarized] 4460 4461 4462 Release 2010j - 2010-05-10 09:07:48 -0400 4463 4464 changes for Baha de Banderas and for version naming 4465 4466 4467 Release data2010i - 2010-04-16 18:50:45 -0400 4468 4469 the end of DST in Morocco on 2010-08-08 4470 4471 4472 Release data2010h - 2010-04-05 09:58:56 -0400 4473 4474 [not summarized] 4475 4476 4477 Release data2010g - 2010-03-24 11:14:53 -0400 4478 4479 [not summarized] 4480 4481 4482 Release 2010f - 2010-03-22 09:45:46 -0400 4483 4484 [not summarized] 4485 4486 4487 Release data2010e - 2010-03-08 14:24:27 -0500 4488 4489 corrects the Dhaka bug found by Danvin Ruangchan 4490 4491 4492 Release data2010d - 2010-03-06 07:26:01 -0500 4493 4494 [not summarized] 4495 4496 4497 Release 2010c - 2010-03-01 09:20:58 -0500 4498 4499 changes including KRE's suggestion for earlier initialization of 4500 "goahead" and "goback" structure elements 4501 4502 4503 Release code2010a - 2010-02-16 10:40:04 -0500 4504 4505 [not summarized] 4506 4507 4508 Release data2010b - 2010-01-20 12:37:01 -0500 4509 4510 Mexico changes 4511 4512 4513 Release data2010a - 2010-01-18 08:30:04 -0500 4514 4515 changes to Dhaka 4516 4517 4518 Release data2009u - 2009-12-26 08:32:28 -0500 4519 4520 changes to DST in Bangladesh 4521 4522 4523 Release 2009t - 2009-12-21 13:24:27 -0500 4524 4525 [not summarized] 4526 4527 4528 Release data2009s - 2009-11-14 10:26:32 -0500 4529 4530 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 4531 4532 4533 Release 2009r - 2009-11-09 10:10:31 -0500 4534 4535 "antarctica" and "tz-link.htm" changes 4536 4537 4538 Release 2009q - 2009-11-02 09:12:40 -0500 4539 4540 with two corrections as reported by Eric Muller and Philip Newton 4541 4542 4543 Release data2009p - 2009-10-23 15:05:27 -0400 4544 4545 Argentina (including San Luis) changes (with the correction from 4546 Mariano Absatz) 4547 4548 4549 Release data2009o - 2009-10-14 16:49:38 -0400 4550 4551 Samoa (commentary only), Pakistan, and Bangladesh changes 4552 4553 4554 Release data2009n - 2009-09-22 15:13:38 -0400 4555 4556 added commentary for Argentina and a change to the end of DST in 4557 2009 in Pakistan 4558 4559 4560 Release data2009m - 2009-09-03 10:23:43 -0400 4561 4562 Samoa and Palestine changes 4563 4564 4565 Release data2009l - 2009-08-14 09:13:07 -0400 4566 4567 Samoa (comments only) and Egypt 4568 4569 4570 Release 2009k - 2009-07-20 09:46:08 -0400 4571 4572 [not summarized] 4573 4574 4575 Release data2009j - 2009-06-15 06:43:59 -0400 4576 4577 Bangladesh change (with a short turnaround since the DST change is 4578 impending) 4579 4580 4581 Release 2009i - 2009-06-08 09:21:22 -0400 4582 4583 updating for DST in Bangladesh this year 4584 4585 4586 Release 2009h - 2009-05-26 09:19:14 -0400 4587 4588 [not summarized] 4589 4590 4591 Release data2009g - 2009-04-20 16:34:07 -0400 4592 4593 Cairo 4594 4595 4596 Release data2009f - 2009-04-10 11:00:52 -0400 4597 4598 correct DST in Pakistan 4599 4600 4601 Release 2009e - 2009-04-06 09:08:11 -0400 4602 4603 [not summarized] 4604 4605 4606 Release 2009d - 2009-03-23 09:38:12 -0400 4607 4608 Morocco, Tunisia, Argentina, and American Astronomical Society changes 4609 4610 4611 Release data2009c - 2009-03-16 09:47:51 -0400 4612 4613 change to the start of Cuban DST 4614 4615 4616 Release 2009b - 2009-02-09 11:15:22 -0500 4617 4618 [not summarized] 4619 4620 4621 Release 2009a - 2009-01-21 10:09:39 -0500 4622 4623 [not summarized] 4624 4625 4626 Release data2008i - 2008-10-21 12:10:25 -0400 4627 4628 southamerica and zone.tab files, with Argentina DST rule changes and 4629 United States zone reordering and recommenting 4630 4631 4632 Release 2008h - 2008-10-13 07:33:56 -0400 4633 4634 [not summarized] 4635 4636 4637 Release 2008g - 2008-10-06 09:03:18 -0400 4638 4639 Fix a broken HTML anchor and update Brazil's DST transitions; 4640 there's also a slight reordering of information in tz-art.htm. 4641 4642 4643 Release data2008f - 2008-09-09 22:33:26 -0400 4644 4645 [not summarized] 4646 4647 4648 Release 2008e - 2008-07-28 14:11:17 -0400 4649 4650 changes by Arthur David Olson and Jesper Nrgaard Welen 4651 4652 4653 Release data2008d - 2008-07-07 09:51:38 -0400 4654 4655 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 4656 4657 4658 Release data2008c - 2008-05-19 17:48:03 -0400 4659 4660 Pakistan, Morocco, and Mongolia 4661 4662 4663 Release data2008b - 2008-03-24 08:30:59 -0400 4664 4665 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 4666 link provided 4667 4668 4669 Release 2008a - 2008-03-08 05:42:16 -0500 4670 4671 [not summarized] 4672 4673 4674 Release 2007k - 2007-12-31 10:25:22 -0500 4675 4676 most importantly, changes to the "southamerica" file based on 4677 Argentina's readoption of daylight saving time 4678 4679 4680 Release 2007j - 2007-12-03 09:51:01 -0500 4681 4682 1. eliminate the "P" (parameter) macro; 4683 4684 2. the "noncontroversial" changes circulated on the time zone 4685 mailing list (less the changes to "logwtmp.c"); 4686 4687 3. eliminate "too many transition" errors when "min" is used in time 4688 zone rules; 4689 4690 4. changes by Paul Eggert (including updated information for Venezuela). 4691 4692 4693 Release data2007i - 2007-10-30 10:28:11 -0400 4694 4695 changes for Cuba and Syria 4696 4697 4698 Release 2007h - 2007-10-01 10:05:51 -0400 4699 4700 changes by Paul Eggert, as well as an updated link to the ICU 4701 project in tz-link.htm 4702 4703 4704 Release 2007g - 2007-08-20 10:47:59 -0400 4705 4706 changes by Paul Eggert 4707 4708 The "leapseconds" file has been updated to incorporate the most 4709 recent International Earth Rotation and Reference Systems Service 4710 (IERS) bulletin. 4711 4712 There's an addition to tz-art.htm regarding the television show "Medium". 4713 4714 4715 Release 2007f - 2007-05-07 10:46:46 -0400 4716 4717 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 4718 Zealand) 4719 4720 changes to zic.c to allow hour values greater than 24 (along with 4721 Paul's improved time value overflow checking) 4722 4723 4724 Release 2007e - 2007-04-02 10:11:52 -0400 4725 4726 Syria and Honduras changes by Paul Eggert 4727 4728 zic.c variable renaming changes by Arthur David Olson 4729 4730 4731 Release 2007d - 2007-03-20 08:48:30 -0400 4732 4733 changes by Paul Eggert 4734 4735 the elimination of white space at the ends of lines 4736 4737 4738 Release 2007c - 2007-02-26 09:09:37 -0500 4739 4740 changes by Paul Eggert 4741 4742 4743 Release 2007b - 2007-02-12 09:34:20 -0500 4744 4745 Paul Eggert's proposed change to the quotation handling logic in zic.c. 4746 4747 changes to the commentary in "leapseconds" reflecting the IERS 4748 announcement that there is to be no positive leap second at the end 4749 of June 2007. 4750 4751 4752 Release 2007a - 2007-01-08 12:28:29 -0500 4753 4754 changes by Paul Eggert 4755 4756 Derick Rethans's Asmara change 4757 4758 Oscar van Vlijmen's Easter Island local mean time change 4759 4760 symbolic link changes 4761 4762 4763 Release 2006p - 2006-11-27 08:54:27 -0500 4764 4765 changes by Paul Eggert 4766 4767 4768 Release 2006o - 2006-11-06 09:18:07 -0500 4769 4770 changes by Paul Eggert 4771 4772 4773 Release 2006n - 2006-10-10 11:32:06 -0400 4774 4775 changes by Paul Eggert 4776 4777 4778 Release 2006m - 2006-10-02 15:32:35 -0400 4779 4780 changes for Uruguay, Palestine, and Egypt by Paul Eggert 4781 4782 (minimalist) changes to zic.8 to clarify "until" information 4783 4784 4785 Release data2006l - 2006-09-18 12:58:11 -0400 4786 4787 Paul's best-effort work on this coming weekend's Egypt time change 4788 4789 4790 Release 2006k - 2006-08-28 12:19:09 -0400 4791 4792 changes by Paul Eggert 4793 4794 4795 Release 2006j - 2006-08-21 09:56:32 -0400 4796 4797 changes by Paul Eggert 4798 4799 4800 Release code2006i - 2006-08-07 12:30:55 -0400 4801 4802 localtime.c fixes 4803 4804 Ken Pizzini's conversion script 4805 4806 4807 Release code2006h - 2006-07-24 09:19:37 -0400 4808 4809 adds public domain notices to four files 4810 4811 includes a fix for transition times being off by a second 4812 4813 adds a new recording to the "arts" file (information courtesy Colin Bowern) 4814 4815 4816 Release 2006g - 2006-05-08 17:18:09 -0400 4817 4818 northamerica changes by Paul Eggert 4819 4820 4821 Release 2006f - 2006-05-01 11:46:00 -0400 4822 4823 a missing version number problem is fixed (with thanks to Bradley 4824 White for catching the problem) 4825 4826 4827 Release 2006d - 2006-04-17 14:33:43 -0400 4828 4829 changes by Paul Eggert 4830 4831 added new items to tz-arts.htm that were found by Paul 4832 4833 4834 Release 2006c - 2006-04-03 10:09:32 -0400 4835 4836 two sets of data changes by Paul Eggert 4837 4838 a fencepost error fix in zic.c 4839 4840 changes to zic.c and the "europe" file to minimize differences 4841 between output produced by the old 32-bit zic and the new 64-bit 4842 version 4843 4844 4845 Release 2006b - 2006-02-20 10:08:18 -0500 4846 [tz32code2006b + tz64code2006b + tzdata2006b] 4847 4848 64-bit code 4849 4850 All SCCS IDs were bumped to "8.1" for this release. 4851 4852 4853 Release 2006a - 2006-01-30 08:59:31 -0500 4854 4855 changes by Paul Eggert (in particular, Indiana time zone moves) 4856 4857 an addition to the zic manual page to describe how special-case 4858 transitions are handled 4859 4860 4861 Release 2005r - 2005-12-27 09:27:13 -0500 4862 4863 Canadian changes by Paul Eggert 4864 4865 They also add "<pre>" directives to time zone data files and reflect 4866 changes to warning message logic in "zdump.c" (but with calls to 4867 "gettext" kept unbundled at the suggestion of Ken Pizzini). 4868 4869 4870 Release 2005q - 2005-12-13 09:17:09 -0500 4871 4872 Nothing earth-shaking here: 4873 1. Electronic mail addresses have been removed. 4874 2. Casts of the return value of exit have been removed. 4875 3. Casts of the argument of is.* macros have been added. 4876 4. Indentation in one section of zic.c has been fixed. 4877 5. References to dead URLs in the data files have been dealt with. 4878 4879 4880 Release 2005p - 2005-12-05 10:30:53 -0500 4881 4882 "systemv", "tz-link.htm", and "zdump.c" changes 4883 (less the casts of arguments to the is* macros) 4884 4885 4886 Release 2005o - 2005-11-28 10:55:26 -0500 4887 4888 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 4889 4890 zdump.c lint fixes by Arthur David Olson 4891 4892 4893 Release 2005n - 2005-10-03 09:44:09 -0400 4894 4895 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 4896 et al. changes) 4897 4898 4899 Release 2005m - 2005-08-29 12:15:40 -0400 4900 4901 changes by Paul Eggert (with a small tweak to the tz-art change) 4902 4903 a declaration of an unused variable has been removed from zdump.c 4904 4905 4906 Release 2005l - 2005-08-22 12:06:39 -0400 4907 4908 changes by Paul Eggert 4909 4910 overflow/underflow checks by Arthur David Olson, minus changes to 4911 the "Theory" file about the pending addition of 64-bit data (I grow 4912 less confident of the changes being accepted with each passing day, 4913 and the changes no longer increase the data files nine-fold--there's 4914 less than a doubling in size by my local Sun's reckoning) 4915 4916 4917 Release 2005k - 2005-07-14 14:14:24 -0400 4918 4919 The "leapseconds" file has been edited to reflect the recently 4920 announced leap second at the end of 2005. 4921 4922 I've also deleted electronic mail addresses from the files as an 4923 anti-spam measure. 4924 4925 4926 Release 2005j - 2005-06-13 14:34:13 -0400 4927 4928 These reflect changes to limit the length of time zone abbreviations 4929 and the characters used in those abbreviations. 4930 4931 There are also changes to handle POSIX-style "quoted" timezone 4932 environment variables. 4933 4934 The changes were circulated on the time zone mailing list; the only 4935 change since then was the removal of a couple of minimum-length of 4936 abbreviation checks. 4937 4938 4939 Release data2005i - 2005-04-21 15:04:16 -0400 4940 4941 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 4942 4943 4944 Release 2005h - 2005-04-04 11:24:47 -0400 4945 4946 changes by Paul Eggert 4947 4948 minor changes to Makefile and zdump.c to produce more useful output 4949 when doing a "make typecheck" 4950 4951 4952 Release 2005g - 2005-03-14 10:11:21 -0500 4953 4954 changes by Paul Eggert (a change to current DST rules in Uruguay and 4955 an update to a link to time zone software) 4956 4957 4958 Release 2005f - 2005-03-01 08:45:32 -0500 4959 4960 data and documentation changes by Paul Eggert 4961 4962 4963 Release 2005e - 2005-02-10 15:59:44 -0500 4964 4965 [not summarized] 4966 4967 4968 Release code2005d - 2005-01-31 09:21:47 -0500 4969 4970 make zic complain about links to links if the -v flag is used 4971 4972 have "make public" do more code checking 4973 4974 add an include to "localtime.c" for the benefit of gcc systems 4975 4976 4977 Release 2005c - 2005-01-17 18:36:29 -0500 4978 4979 get better results when mktime runs on a system where time_t is double 4980 4981 changes to the data files (most importantly to Paraguay) 4982 4983 4984 Release 2005b - 2005-01-10 09:19:54 -0500 4985 4986 Get localtime and gmtime working on systems with exotic time_t types. 4987 4988 Update the leap second commentary in the "leapseconds" file. 4989 4990 4991 Release 2005a - 2005-01-01 13:13:44 -0500 4992 4993 [not summarized] 4994 4995 4996 Release code2004i - 2004-12-14 13:42:58 -0500 4997 4998 Deal with systems where time_t is unsigned. 4999 5000 5001 Release code2004h - 2004-12-07 11:40:18 -0500 5002 5003 64-bit-time_t changes 5004 5005 5006 Release 2004g - 2004-11-02 09:06:01 -0500 5007 5008 update to Cuba (taking effect this weekend) 5009 5010 other changes by Paul Eggert 5011 5012 correction of the spelling of Oslo 5013 5014 changed versions of difftime.c and private.h 5015 5016 5017 Release code2004f - 2004-10-21 10:25:22 -0400 5018 5019 Cope with wide-ranging tm_year values. 5020 5021 5022 Release 2004e - 2004-10-11 14:47:21 -0400 5023 5024 Brazil/Argentina/Israel changes by Paul Eggert 5025 5026 changes to tz-link.htm by Paul 5027 5028 one small fix to Makefile 5029 5030 5031 Release 2004d - 2004-09-22 08:27:29 -0400 5032 5033 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 5034 5035 5036 Release 2004c - 2004-08-11 12:06:26 -0400 5037 5038 asctime-related changes 5039 5040 (variants of) some of the documentation changes suggested by Paul Eggert 5041 5042 5043 Release 2004b - 2004-07-19 14:33:35 -0400 5044 5045 data changes by Paul Eggert - most importantly, updates for Argentina 5046 5047 5048 Release 2004a - 2004-05-27 12:00:47 -0400 5049 5050 changes by Paul Eggert 5051 5052 Handle DST transitions that occur at the end of a month in some 5053 years but at the start of the following month in other years. 5054 5055 Add a copy of the correspondence that's the basis for claims about 5056 DST in the Navajo Nation. 5057 5058 5059 Release 2003e - 2003-12-15 09:36:47 -0500 5060 5061 changes by Arthur David Olson (primarily code changes) 5062 5063 changes by Paul Eggert (primarily data changes) 5064 5065 minor changes to "Makefile" and "northamerica" (in the latter case, 5066 optimization of the "Toronto" rules) 5067 5068 5069 Release 2003d - 2003-10-06 09:34:44 -0400 5070 5071 changes by Paul Eggert 5072 5073 5074 Release 2003c - 2003-09-16 10:47:05 -0400 5075 5076 Fix bad returns in zic.c's inleap function. 5077 Thanks to Bradley White for catching the problem! 5078 5079 5080 Release 2003b - 2003-09-16 07:13:44 -0400 5081 5082 Add a "--version" option (and documentation) to the zic and zdump commands. 5083 5084 changes to overflow/underflow checking in zic 5085 5086 a localtime typo fix. 5087 5088 Update the leapseconds and tz-art.htm files. 5089 5090 5091 Release 2003a - 2003-03-24 09:30:54 -0500 5092 5093 changes by Paul Eggert 5094 5095 a few additions and modifications to the tz-art.htm file 5096 5097 5098 Release 2002d - 2002-10-15 13:12:42 -0400 5099 5100 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 5101 5102 There's also a new time zone quote in "tz-art.htm". 5103 5104 5105 Release 2002c - 2002-04-04 11:55:20 -0500 5106 5107 changes by Paul Eggert 5108 5109 Change zic.c to avoid creating symlinks to files that don't exist. 5110 5111 5112 Release 2002b - 2002-01-28 12:56:03 -0500 5113 5114 [These change notes are for Release 2002a, which was corrupted. 5115 2002b was a corrected version of 2002a.] 5116 5117 changes by Paul Eggert 5118 5119 Update the "leapseconds" file to note that there'll be no leap 5120 second at the end of June, 2002. 5121 5122 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 5123 5124 Change to "difftime.c" to avoid sizeof problems. 5125 5126 5127 Release 2001d - 2001-10-09 13:31:32 -0400 5128 5129 changes by Paul Eggert 5130 5131 5132 Release 2001c - 2001-06-05 13:59:55 -0400 5133 5134 changes by Paul Eggert and Andrew Brown 5135 5136 5137 Release 2001b - 2001-04-05 16:44:38 -0400 5138 5139 changes by Paul Eggert (modulo jnorgard's typo fix) 5140 5141 tz-art.htm has been HTMLified. 5142 5143 5144 Release 2001a - 2001-03-13 12:57:44 -0500 5145 5146 changes by Paul Eggert 5147 5148 An addition to the "leapseconds" file: comments with the text of the 5149 latest IERS leap second notice. 5150 5151 Trailing white space has been removed from data file lines, and 5152 repeated spaces in "Rule Jordan" lines in the "asia" file have been 5153 converted to tabs. 5154 5155 5156 Release 2000h - 2000-12-14 15:33:38 -0500 5157 5158 changes by Paul Eggert 5159 5160 one typo fix in the "art" file 5161 5162 With providence, this is the last update of the millennium. 5163 5164 5165 Release 2000g - 2000-10-10 11:35:22 -0400 5166 5167 changes by Paul Eggert 5168 5169 correction of John Mackin's name submitted by Robert Elz 5170 5171 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 5172 Emmy Awards broadcast. 5173 5174 5175 Release 2000f - 2000-08-10 09:31:58 -0400 5176 5177 changes by Paul Eggert 5178 5179 Added information in "tz-art.htm" on a Seinfeld reference to DST. 5180 5181 Error checking and messages in the "yearistype" script have been 5182 improved. 5183 5184 5185 Release 2000e - 2000-07-31 09:27:54 -0400 5186 5187 data changes by Paul Eggert 5188 5189 a change to the default value of the defined constant HAVE_STRERROR 5190 5191 the addition of a Dave Barry quote on DST to the tz-arts file 5192 5193 5194 Release 2000d - 2000-04-20 15:43:04 -0400 5195 5196 changes to the documentation and code of strftime for C99 conformance 5197 5198 a bug fix for date.c 5199 5200 These are based on (though modified from) changes by Paul Eggert. 5201 5202 5203 Release 2000c - 2000-03-04 10:31:43 -0500 5204 5205 changes by Paul Eggert 5206 5207 5208 Release 2000b - 2000-02-21 12:16:29 -0500 5209 5210 changes by Paul Eggert and Joseph Myers 5211 5212 modest tweaks to the tz-art.htm and tz-link.htm files 5213 5214 5215 Release 2000a - 2000-01-18 09:21:26 -0500 5216 5217 changes by Paul Eggert 5218 5219 The two hypertext documents have also been renamed. 5220 5221 5222 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 5223 5224 Paul Eggert's changes 5225 5226 additions to the "zic" manual page and the "Arts.htm" file 5227 5228 5229 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 5230 5231 [not summarized] 5232 5233 5234 Release data1999h - 1999-10-07 03:50:29 -0400 5235 5236 changes by Paul Eggert to "europe" (most importantly, fixing 5237 Lithuania and Estonia) 5238 5239 5240 Release 1999g - 1999-09-28 11:06:18 -0400 5241 5242 data changes by Paul Eggert (most importantly, the change for 5243 Lebanon that buys correctness for this coming Sunday) 5244 5245 The "code" file contains changes to "Makefile" and "checktab.awk" to 5246 allow better checking of time zone files before they are published. 5247 5248 5249 Release 1999f - 1999-09-23 09:48:14 -0400 5250 5251 changes by Arthur David Olson and Paul Eggert 5252 5253 5254 Release 1999e - 1999-08-17 15:20:54 -0400 5255 5256 changes circulated by Paul Eggert, although the change to handling 5257 of DST-specifying timezone names has been commented out for now 5258 (search for "XXX" in "localtime.c" for details). These files also 5259 do not make any changes to the start of DST in Brazil. 5260 5261 In addition to Paul's changes, there are updates to "Arts.htm" and 5262 cleanups of URLs. 5263 5264 5265 Release 1999d - 1999-03-30 11:31:07 -0500 5266 5267 changes by Paul Eggert 5268 5269 The Makefile's "make public" rule has also been changed to do a test 5270 compile of each individual time zone data file (which should help 5271 avoid problems such as the one we had with Nicosia). 5272 5273 5274 Release 1999c - 1999-03-25 09:47:47 -0500 5275 5276 changes by Paul Eggert, most importantly the change for Chile. 5277 5278 5279 Release 1999b - 1999-02-01 17:51:44 -0500 5280 5281 changes by Paul Eggert 5282 5283 code changes (suggested by Mani Varadarajan, mani at be.com) for 5284 correct handling of symbolic links when building using a relative directory 5285 5286 code changes to generate correct messages for failed links 5287 5288 updates to the URLs in Arts.htm 5289 5290 5291 Release 1999a - 1999-01-19 16:20:29 -0500 5292 5293 error message internationalizations and corrections in zic.c and 5294 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 5295 to whom thanks!) 5296 5297 5298 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 5299 5300 changes for Brazil, Chile, and Germany 5301 5302 support for use of "24:00" in the input files for the time zone compiler 5303 5304 5305 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 5306 5307 changes by Paul Eggert 5308 5309 correction to a define in the "private.h" file 5310 5311 5312 Release data1998g - 1998-08-11 03:28:35 -0000 5313 [tzdata1998g.tar.gz is missing!] 5314 5315 Lithuanian change provided by mgedmin at pub.osf.it 5316 5317 Move creation of the GMT link with Etc/GMT to "etcetera" (from 5318 "backward") to ensure that the GMT file is created even where folks 5319 don't want the "backward" links (as suggested by Paul Eggert). 5320 5321 5322 Release data1998f - 1998-07-20 13:50:00 -0000 5323 [tzdata1998f.tar.gz is missing!] 5324 5325 Update the "leapseconds" file to include the newly-announced 5326 insertion at the end of 1998. 5327 5328 5329 Release code1998f - 1998-06-01 10:18:31 -0400 5330 5331 addition to localtime.c by Guy Harris 5332 5333 5334 Release 1998e - 1998-05-28 09:56:26 -0400 5335 5336 The Makefile is changed to produce zoneinfo-posix rather than 5337 zoneinfo/posix, and to produce zoneinfo-leaps rather than 5338 zoneinfo/right. 5339 5340 data changes by Paul Eggert 5341 5342 changes from Guy Harris to provide asctime_r and ctime_r 5343 5344 A usno1998 file (substantially identical to usno1997) has been added. 5345 5346 5347 Release 1998d - 1998-05-14 11:58:34 -0400 5348 5349 changes to comments (in particular, elimination of references to CIA maps). 5350 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 5351 where changes occur. 5352 5353 5354 Release 1998c - 1998-02-28 12:32:26 -0500 5355 5356 changes by Paul Eggert (save the "French correction," on which I'll 5357 wait for the dust to settle) 5358 5359 symlink changes 5360 5361 changes and additions to Arts.htm 5362 5363 5364 Release 1998b - 1998-01-17 14:31:51 -0500 5365 5366 URL cleanups and additions 5367 5368 5369 Release 1998a - 1998-01-13 12:37:35 -0500 5370 5371 changes by Paul Eggert 5372 5373 5374 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 5375 5376 changes by Paul Eggert, with minor modifications from Arthur David 5377 Olson to make the files more browser friendly 5378 5379 5380 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 5381 5382 minor changes to put "TZif" at the start of each timezone information file 5383 5384 a rule has also been added to the Makefile so you can 5385 make zones 5386 to just recompile the zone information files (rather than doing a 5387 full "make install" with its other effects). 5388 5389 5390 Release data1997i - 1997-10-07 08:45:38 -0400 5391 5392 changes to Africa by Paul Eggert 5393 5394 5395 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 5396 5397 corrections for Uruguay (and other locations) 5398 5399 Arthur David Olson's simple-minded fix allowing mktime to both 5400 correctly handle leap seconds and correctly handle tm_sec values 5401 upon which arithmetic has been performed. 5402 5403 5404 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 5405 5406 Paul Eggert's updates 5407 5408 a small change to a function prototype; 5409 5410 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 5411 include information on Around the World in Eighty Days. 5412 5413 5414 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 5415 5416 fixes to zic's error handling 5417 5418 changes inspired by the item circulated on Slovenia 5419 5420 The description of Web resources has been HTMLified for browsing 5421 convenience. 5422 5423 A new piece of tz-related music has been added to the "Music" file. 5424 5425 5426 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 5427 5428 Paul Eggert's latest suggestions 5429 5430 5431 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 5432 5433 changes to "zic.c" to correct performance of the "-s" option 5434 5435 a new file "usno1997" 5436 5437 5438 Release data1997c - 1997-03-04 09:58:18 -0500 5439 5440 changes in Israel 5441 5442 5443 Release 1997b - 1997-02-27 18:34:19 -0500 5444 5445 The data file incorporates the 1997 leap second. 5446 5447 The code file incorporates Arthur David Olson's take on the 5448 zic/multiprocessor/directory-creation situation. 5449 5450 5451 Release 1997a - 1997-01-21 09:11:10 -0500 5452 5453 Paul Eggert's Antarctica (and other changes) 5454 5455 Arthur David Olson finessed the "getopt" issue by checking against 5456 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 5457 is returned while SunOS 5.5's manual says EOF is returned). 5458 5459 5460 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 5461 5462 Paul Eggert's latest changes 5463 5464 5465 Release code1996n - 1996-12-16 09:42:02 -0500 5466 5467 link snapping fix from Bruce Evans (via Garrett Wollman) 5468 5469 5470 Release data1996m - 1996-11-24 02:37:34 -0000 5471 [tzdata1996m.tar.gz is missing!] 5472 5473 Paul Eggert's batch of changes 5474 5475 5476 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 5477 5478 No functional changes here; the files have simply been changed to 5479 make more use of ISO style dates in comments. The names of the above 5480 files now include the year in full. 5481 5482 5483 Release code96l - 1996-09-08 17:12:20 -0400 5484 5485 tzcode96k was missing a couple of pieces. 5486 5487 5488 Release 96k - 1996-09-08 16:06:22 -0400 5489 5490 the latest round of changes from Paul Eggert 5491 5492 the recent Year 2000 material 5493 5494 5495 Release code96j - 1996-07-30 13:18:53 -0400 5496 5497 Set sp->typecnt as suggested by Timothy Patrick Murphy. 5498 5499 5500 Release code96i - 1996-07-27 20:11:35 -0400 5501 5502 Paul's suggested patch for strftime %V week numbers 5503 5504 5505 Release data96i - 1996-07-01 18:13:04 -0400 5506 5507 "northamerica" and "europe" changes by Paul Eggert 5508 5509 5510 Release code96h - 1996-06-05 08:02:21 -0400 5511 5512 fix for handling transitions specified in Universal Time 5513 5514 Some "public domain" notices have also been added. 5515 5516 5517 Release code96g - 1996-05-16 14:00:26 -0400 5518 5519 fix for the simultaneous-DST-and-zone-change challenge 5520 5521 5522 Release data96h - 1996-05-09 17:40:51 -0400 5523 5524 changes by Paul Eggert 5525 5526 5527 Release code96f-data96g - 1996-05-03 03:09:59 -0000 5528 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 5529 5530 The changes get us some of the way to fixing the problems noted in Paul 5531 Eggert's letter yesterday (in addition to a few others). The approach 5532 has been to make zic a bit smarter about figuring out what time zone 5533 abbreviations apply just after the time specified in the "UNTIL" part 5534 of a zone line. Putting the smarts in zic means avoiding having 5535 transition times show up in both "Zone" lines and "Rule" lines, which 5536 in turn avoids multiple transition time entries in time zone files. 5537 (This also makes the zic input files such as "europe" a bit shorter and 5538 should ease maintenance.) 5539 5540 5541 Release data96f - 1996-04-19 19:20:03 -0000 5542 [tzdata96f.tar.gz is missing!] 5543 5544 The only changes are to the "northamerica" file; the time zone 5545 abbreviation for Denver is corrected to MST (and MDT), and the 5546 comments for Mexico have been updated. 5547 5548 5549 Release data96e - 1996-03-19 17:37:26 -0500 5550 5551 Proposals by Paul Eggert, in particular the Portugal change that 5552 comes into play at the end of this month. 5553 5554 5555 Release data96d - 1996-03-18 20:49:39 -0500 5556 5557 [not summarized] 5558 5559 5560 Release code96e - 1996-02-29 15:43:27 -0000 5561 [tzcode96e.tar.gz is missing!] 5562 5563 internationalization changes and the fix to the documentation for strftime 5564 5565 5566 Release code96d-data96c - 1996-02-12 11:05:27 -0500 5567 5568 The "code" file simply updates Bob Kridle's electronic address. 5569 5570 The "data" file updates rules for Mexico. 5571 5572 5573 Release data96b - 1996-01-27 15:44:42 -0500 5574 5575 Kiribati change 5576 5577 5578 Release code96c - 1996-01-16 16:58:15 -0500 5579 5580 leap-year streamlining and binary-search changes 5581 5582 fix to newctime.3 5583 5584 5585 Release code96b - 1996-01-10 20:42:39 -0500 5586 5587 fixes and enhancements from Paul Eggert, including code that 5588 emulates the behavior of recent versions of the SunOS "date" 5589 command. 5590 5591 5592 Release 96a - 1996-01-06 09:08:24 -0500 5593 5594 Israel updates 5595 5596 fixes to strftime.c for correct ISO 8601 week number generation, 5597 plus support for two new formats ('G' and 'g') to give ISO 8601 year 5598 numbers (which are not necessarily the same as calendar year numbers) 5599 5600 5601 Release code95i-data95m - 1995-12-21 12:46:47 -0500 5602 5603 The latest revisions from Paul Eggert are included, the usno1995 5604 file has been updated, and a new file ("WWW") covering useful URLs 5605 has been added. 5606 5607 5608 Release code95h-data95l - 1995-12-19 18:10:12 -0500 5609 5610 A simplification of a macro definition, a change to data for Sudan, 5611 and (for last minute shoppers) notes in the "Music" file on the CD 5612 "Old Man Time". 5613 5614 5615 Release code95g-data95k - 1995-10-30 10:32:47 -0500 5616 5617 (slightly reformatted) 8-bit-clean proposed patch 5618 5619 minor patch: US/Eastern -> America/New_York 5620 5621 snapshot of the USNO's latest data ("usno1995") 5622 5623 some other minor cleanups 5624 5625 5626 Release code95f-data95j - 1995-10-28 21:01:34 -0000 5627 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 5628 5629 European cleanups 5630 5631 support for 64-bit time_t's 5632 5633 optimization in localtime.c 5634 5635 5636 Release code95e - 1995-10-13 13:23:57 -0400 5637 5638 the mktime change to scan from future to past when trying to find time zone 5639 offsets 5640 5641 5642 Release data95i - 1995-09-26 10:43:26 -0400 5643 5644 For Canada/Central, guess that the Sun customer's "one week too 5645 early" was just a approximation, and the true error is one month 5646 too early. This is consistent with the rest of Canada. 5647 5648 5649 Release data95h - 1995-09-21 11:26:48 -0400 5650 5651 latest changes from Paul Eggert 5652 5653 5654 Release code95d - 1995-09-14 11:14:45 -0400 5655 5656 the addition of a "Music" file, which documents four recorded 5657 versions of the tune "Save That Time". 5658 5659 5660 Release data95g - 1995-09-01 17:21:36 -0400 5661 5662 "yearistype" correction 5663 5664 5665 Release data95f - 1995-08-28 20:46:56 -0400 5666 5667 Paul Eggert's change to the australasia file 5668 5669 5670 Release data95e - 1995-07-08 18:02:34 -0400 5671 5672 The only change is a leap second at the end of this year. 5673 Thanks to Bradley White for forwarding news on the leap second. 5674 5675 5676 Release data95d - 1995-07-03 13:26:22 -0400 5677 5678 Paul Eggert's changes 5679 5680 5681 Release data95c - 1995-07-02 19:19:28 -0400 5682 5683 changes to "asia", "backward", "europe", and "southamerica" 5684 (read: northamericacentrics need not apply) 5685 5686 5687 Release code95c - 1995-03-13 14:00:46 -0500 5688 5689 one-line fix for sign extension problems in detzcode 5690 5691 5692 Release 95b - 1995-03-04 11:22:38 -0500 5693 5694 Minor changes in both: 5695 5696 The "code" file contains a workaround for the lack of "unistd.h" in 5697 Microsoft C++ version 7. 5698 5699 The "data" file contains a fixed "Link" for America/Shiprock. 5700 5701 5702 Release 94h - 1994-12-10 12:51:14 -0500 5703 5704 The files: 5705 5706 * incorporate the changes to "zdump" and "date" to make changes to 5707 the "TZ" environment variable permanent; 5708 5709 * incorporate the table changes by Paul Eggert; 5710 5711 * include (and document) support for universal time specifications in 5712 data files - but do not (yet) include use of this feature in the 5713 data files. 5714 5715 Think of this as "TZ Classic" - the software has been set up not to break if 5716 universal time shows up in its input, and data entries have been 5717 left as is so as not to break existing implementations. 5718 5719 5720 Release data94f - 1994-08-20 12:56:09 -0400 5721 5722 (with thanks!) the latest data updates from Paul Eggert 5723 5724 5725 Release data94e - 1994-06-04 13:13:53 -0400 5726 5727 [not summarized] 5728 5729 5730 Release code94g - 1994-05-05 12:14:07 -0400 5731 5732 fix missing "optind.c" and a reference to it in the Makefile 5733 5734 5735 Release code94f - 1994-05-05 13:00:33 -0000 5736 [tzcode94f.tar.gz is missing!] 5737 5738 changes to avoid overflow in difftime, as well as changes to cope 5739 with the 52/53 challenge in strftime 5740 5741 5742 Release code94e - 1994-03-30 23:32:59 -0500 5743 5744 change for the benefit of PCTS 5745 5746 5747 Release 94d - 1994-02-24 15:42:25 -0500 5748 5749 Avoid clashes with POSIX semantics for zones such as GMT+4. 5750 5751 Some other very minor housekeeping is also present. 5752 5753 5754 Release code94c - 1994-02-10 08:52:40 -0500 5755 5756 Fix bug where mkdirs was broken unless you compile with 5757 -fwritable-strings (which is generally losing to do). 5758 5759 5760 Release 94b - 1994-02-07 10:04:33 -0500 5761 5762 work by Paul Eggert who notes: 5763 5764 I found another book of time zone histories by E W Whitman; it's not 5765 as extensive as Shanks but has a few goodies of its own. I used it 5766 to update the tables. I also fixed some more as a result of 5767 correspondence with Adam David and Peter Ilieve, and move some stray 5768 links from 'europe' to 'backward'. I corrected some scanning errors 5769 in usno1989. 5770 5771 As far as the code goes, I fixed zic to allow years in the range 5772 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 5773 And I cleaned up the zic documentation a little bit. 5774 5775 5776 Release data94a - 1994-02-03 08:58:54 -0500 5777 5778 It simply incorporates the recently announced leap second into the 5779 "leapseconds" file. 5780 5781 5782 Release 93g - 1993-11-22 17:28:27 -0500 5783 5784 Paul Eggert has provided a good deal of historic information (based 5785 on Shanks), and there are some code changes to deal with the buglets 5786 that crawled out in dealing with the new information. 5787 5788 5789 Release 93f - 1993-10-15 12:27:46 -0400 5790 5791 Paul Eggert's changes 5792 5793 5794 Release 93e - 1993-09-05 21:21:44 -0400 5795 5796 This has updated data for Israel, England, and Kwajalein. There's 5797 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 5798 Thanks to Paul Eggert and Peter Ilieve for the changes. 5799 5800 5801 Release 93d - 1993-06-17 23:34:17 -0400 5802 5803 new fix and new data on Israel 5804 5805 5806 Release 93c - 1993-06-06 19:31:55 -0400 5807 5808 [not summarized] 5809 5810 5811 Release 93b - 1993-02-02 14:53:58 -0500 5812 5813 updated "leapseconds" file 5814 5815 5816 Release 93 - 1993-01-08 07:01:06 -0500 5817 5818 At kre's suggestion, the package has been split in two - a code piece 5819 (which also includes documentation) that's only of use to folks who 5820 want to recompile things and a data piece useful to anyone who can 5821 run "zic". 5822 5823 The new version has a few changes to the data files, a few 5824 portability changes, and an off-by-one fix (with thanks to 5825 Tom Karzes at deshaw.com for providing a description and a 5826 solution). 5827 5828 5829 Release 92c - 1992-11-21 17:35:36 -0000 5830 [tz92c.tar.Z is missing!] 5831 5832 The fallout from the latest round of DST transitions. 5833 5834 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 5835 there's also a change to "zic.c" that makes it portable to more systems. 5836 5837 5838 Release 92 - 1992-04-25 18:17:03 -0000 5839 [tz92.tar.Z is missing!] 5840 5841 By popular demand (well, at any rate, following a request by kre at munnari) 5842 5843 5844 The 1989 update of the time zone package featured: 5845 5846 * POSIXization (including interpretation of POSIX-style TZ environment 5847 variables, provided by Guy Harris), 5848 * ANSIfication (including versions of "mktime" and "difftime"), 5849 * SVIDulation (an "altzone" variable) 5850 * MACHination (the "gtime" function) 5851 * corrections to some time zone data (including corrections to the rules 5852 for Great Britain and New Zealand) 5853 * reference data from the United States Naval Observatory for folks who 5854 want to do additional time zones 5855 * and the 1989 data for Saudi Arabia. 5856 5857 (Since this code will be treated as "part of the implementation" in some 5858 places and as "part of the application" in others, there's no good way to 5859 name functions, such as timegm, that are not part of the proposed ANSI C 5860 standard; such functions have kept their old, underscore-free names in this 5861 update.) 5862 5863 And the "dysize" function has disappeared; it was present to allow 5864 compilation of the "date" command on old BSD systems, and a version of "date" 5865 is now provided in the package. The "date" command is not created when you 5866 "make all" since it may lack options provided by the version distributed with 5867 your operating system, or may not interact with the system in the same way 5868 the native version does. 5869 5870 Since POSIX frowns on correct leap second handling, the default behavior of 5871 the "zic" command (in the absence of a "-L" option) has been changed to omit 5872 leap second information from its output files. 5873 5874 5875 ----- 5876 Notes 5877 5878 This file contains copies of the part of each release announcement 5879 that talks about the changes in that release. The text has been 5880 adapted and reformatted for the purposes of this file. 5881 5882 Traditionally a release R consists of a pair of tarball files, 5883 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 5884 code2010a, data2012c) consist of just one or the other tarball, and a 5885 few (e.g., code2012c-data2012d) have tarballs with mixed version 5886 numbers. Recent releases also come in an experimental format 5887 consisting of a single tarball tzdb-R.tar.lz with extra data. 5888 5889 Release timestamps are taken from the release's commit (for newer, 5890 Git-based releases), from the newest file in the tarball (for older 5891 releases, where this info is available) or from the email announcing 5892 the release (if all else fails; these are marked with a time zone 5893 abbreviation of -0000 and an "is missing!" comment). 5894 5895 Earlier versions of the code and data were not announced on the tz 5896 list and are not summarized here. 5897 5898 This file is in the public domain. 5899 5900 Local Variables: 5901 coding: utf-8 5902 End: 5903
Indexes created Tue Sep 30 07:10:03 GMT 2025