NEWS revision 1.39
1 News for the tz database 2 3 Release 2022f - 2022-10-28 18:04:57 -0700 4 5 Briefly: 6 Mexico will no longer observe DST except near the US border. 7 Chihuahua moves to year-round -06 on 2022-10-30. 8 Fiji no longer observes DST. 9 Move links to 'backward'. 10 In vanguard form, GMT is now a Zone and Etc/GMT a link. 11 zic now supports links to links, and vanguard form uses this. 12 Simplify four Ontario zones. 13 Fix a Y2438 bug when reading TZif data. 14 Enable 64-bit time_t on 32-bit glibc platforms. 15 Omit large-file support when no longer needed. 16 In C code, use some C23 features if available. 17 Remove no-longer-needed workaround for Qt bug 53071. 18 19 Changes to future timestamps. 20 21 Mexico will no longer observe DST after 2022, except for areas 22 near the US border that continue to observe US DST rules. 23 On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves 24 from -07 (-06 with DST) to year-round -06, thus not changing 25 its clocks that day. The new law states that Chihuahua 26 near the US border no longer observes US DST. 27 28 Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.) 29 For now, assume DST is suspended indefinitely. 30 31 Changes to data 32 33 Move links to 'backward' to ease and simplify link maintenance. 34 This affects generated data only if you use 'make BACKWARD='. 35 36 GMT is now a Zone and Etc/GMT a link instead of vice versa, 37 as GMT is needed for leap second support whereas Etc/GMT is not. 38 However, this change exposes a bug in TZUpdater 2.3.2 so it is 39 present only in vanguard form for now. 40 41 Vanguard form now uses links to links, as zic now supports this. 42 43 Changes to past timestamps 44 45 Simplify four Ontario zones, as most of the post-1970 differences 46 seem to have been imaginary. (Problem reported by Chris Walton.) 47 Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay 48 to 'backzone'; backward-compatibility links still work, albeit 49 with some different timestamps before November 2005. 50 51 Changes to code 52 53 zic now supports links to links regardless of input line order. 54 For example, if Australia/Sydney is a Zone, the lines 55 Link Australia/Canberra Australia/ACT 56 Link Australia/Sydney Australia/Canberra 57 now work correctly, even though the shell commands 58 ln Australia/Canberra Australia/ACT 59 ln Australia/Sydney Australia/Canberra 60 would fail because the first command attempts to use a link 61 Australia/Canberra that does not exist until after the second 62 command is executed. Previously, zic had unspecified behavior if 63 a Link line's target was another link, and zic often misbehaved if 64 a Link line's target was a later Link line. 65 66 Fix line number in zic's diagnostic for a link to a link. 67 68 Fix a bug that caused localtime to mishandle timestamps starting 69 in the year 2438 when reading data generated by 'zic -b fat' when 70 distant-future DST transitions occur at times given in standard 71 time or in UT, not the usual case of local time. This occurs when 72 the corresponding .zi Rule lines specify DST transitions with TO 73 columns of 'max' and AT columns that end in 's' or 'u'. The 74 number 2438 comes from the 32-bit limit in the year 2038, plus the 75 400-year Gregorian cycle. (Problem reported by Bradley White.) 76 77 On glibc 2.34 and later, which optionally supports 64-bit time_t 78 on platforms like x86 where time_t was traditionally 32 bits, 79 default time_t to 64 instead of 32 bits. This lets functions like 80 localtime support timestamps after the year 2038, and fixes 81 year-2038 problems in zic when accessing files dated after 2038. 82 To continue to limit time_t to 32 bits on these platforms, use 83 "make CFLAGS='-D_TIME_BITS=32'". 84 85 In C code, do not enable large-file support on platforms like AIX 86 and macOS that no longer need it now that tzcode does not use 87 off_t or related functions like 'stat'. Large-file support is 88 still enabled by default on GNU/Linux, as it is needed for 64-bit 89 time_t support. 90 91 In C code, prefer C23 keywords to pre-C23 macros for alignof, 92 bool, false, and true. Also, use the following C23 features if 93 available: __has_include, unreachable. 94 95 zic no longer works around Qt bug 53071, as the relevant Qt 96 releases have been out of support since 2019. This change affects 97 only fat TZif files, as thin files never had the workaround. 98 99 zdump no longer modifies the environ vector when compiled on 100 platforms lacking tm_zone or when compiled with -DUSE_LTZ=0. 101 This avoid undefined behavior on POSIX platforms. 102 103 104 Release 2022e - 2022-10-11 11:13:02 -0700 105 106 Briefly: 107 Jordan and Syria switch from +02/+03 with DST to year-round +03. 108 109 Changes to future timestamps 110 111 Jordan and Syria are abandoning the DST regime and are changing to 112 permanent +03, so they will not fall back from +03 to +02 on 113 2022-10-28. (Thanks to Steffen Thorsen and Issam Al-Zuwairi.) 114 115 Changes to past timestamps 116 117 On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00. 118 119 Changes to past time zone abbreviations and DST flags 120 121 The temporary advancement of clocks in central Mexico in summer 122 1931 is now treated as daylight saving time, instead of as two 123 changes to standard time. 124 125 126 Release 2022d - 2022-09-23 12:02:57 -0700 127 128 Briefly: 129 Palestine transitions are now Saturdays at 02:00. 130 Simplify three Ukraine zones into one. 131 132 Changes to future timestamps 133 134 Palestine now springs forward and falls back at 02:00 on the 135 first Saturday on or after March 24 and October 24, respectively. 136 This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00. 137 (Thanks to Heba Hamad.) 138 139 Changes to past timestamps 140 141 Simplify three Ukraine zones to one, since the post-1970 142 differences seem to have been imaginary. Move Europe/Uzhgorod and 143 Europe/Zaporozhye to 'backzone'; backward-compatibility links 144 still work, albeit with different timestamps before October 1991. 145 146 147 Release 2022c - 2022-08-15 17:47:18 -0700 148 149 Briefly: 150 Work around awk bug in FreeBSD, macOS, etc. 151 Improve tzselect on intercontinental Zones. 152 153 Changes to code 154 155 Work around a bug in onetrueawk that broke commands like 156 'make traditional_tarballs' on FreeBSD, macOS, etc. 157 (Problem reported by Deborah Goldsmith.) 158 159 Add code to tzselect that uses experimental structured comments in 160 zone1970.tab to clarify whether Zones like Africa/Abidjan and 161 Europe/Istanbul cross continent or ocean boundaries. 162 (Inspired by a problem reported by Peter Krefting.) 163 164 Fix bug with 'zic -d /a/b/c' when /a is unwritable but the 165 directory /a/b already exists. 166 167 Remove zoneinfo2tdf.pl, as it was unused and triggered false 168 malware alarms on some email servers. 169 170 171 Release 2022b - 2022-08-10 15:38:32 -0700 172 173 Briefly: 174 Chile's DST is delayed by a week in September 2022. 175 Iran no longer observes DST after 2022. 176 Rename Europe/Kiev to Europe/Kyiv. 177 New zic -R option 178 Vanguard form now uses %z. 179 Finish moving duplicate-since-1970 zones to 'backzone'. 180 New build option PACKRATLIST 181 New tailored_tarballs target, replacing rearguard_tarballs 182 183 Changes to future timestamps 184 185 Chile's 2022 DST start is delayed from September 4 to September 11. 186 (Thanks to Juan Correa.) 187 188 Iran plans to stop observing DST permanently, after it falls back 189 on 2022-09-21. (Thanks to Ali Mirjamali.) 190 191 Changes to past timestamps 192 193 Finish moving to 'backzone' the location-based zones whose 194 timestamps since 1970 are duplicates; adjust links accordingly. 195 This change ordinarily affects only pre-1970 timestamps, and with 196 the new PACKRATLIST option it does not affect any timestamps. 197 In this round the affected zones are Antarctica/Vostok, 198 Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, 199 Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, 200 Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, 201 Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, 202 Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, 203 Pacific/Wake and Pacific/Wallis, and the affected links are 204 Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, 205 Pacific/Truk, and Pacific/Yap. 206 207 From fall 1994 through fall 1995, Shanks wrote that Crimea's 208 DST transitions were at 02:00 standard time, not at 00:00. 209 (Thanks to Michael Deckers.) 210 211 Iran adopted standard time in 1935, not 1946. In 1977 it observed 212 DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 213 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 214 transition was on 05-27, not 03-21. 215 (Thanks to Roozbeh Pournader and Francis Santoni.) 216 217 Chile's observance of -04 from 1946-08-29 through 1947-03-31 was 218 considered DST, not standard time. Santiago and environs had moved 219 their clocks back to rejoin the rest of mainland Chile; put this 220 change at the end of 1946-08-28. (Thanks to Michael Deckers.) 221 222 Some old, small clock transitions have been removed, as people at 223 the time did not change their clocks. This affects Asia/Hong_Kong 224 in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. 225 226 Changes to zone name 227 228 Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in 229 English now. Spelling of other names in Ukraine has not yet 230 demonstrably changed in common English practice so for now these 231 names retain old spellings, as in other countries (e.g., 232 Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). 233 234 Changes to code 235 236 zic has a new option '-R @N' to output explicit transitions < N. 237 (Need suggested by Almaz Mingaleev.) 238 239 'zic -r @N' no longer outputs bad data when N < first transition. 240 (Problem introduced in 2021d and reported by Peter Krefting.) 241 242 zic now checks its input for NUL bytes and unterminated lines, and 243 now supports input line lengths up to 2048 (not 512) bytes. 244 245 gmtime and related code now use the abbreviation "UTC" not "GMT". 246 POSIX is being revised to require this. 247 248 When tzset and related functions set vestigial static variables 249 like tzname, they now prefer specified timestamps to unspecified ones. 250 (Problem reported by Almaz Mingaleev.) 251 252 zic no longer complains "can't determine time zone abbreviation to 253 use just after until time" when a transition to a new standard 254 time occurs simultaneously with the first DST fallback transition. 255 256 Changes to build procedure 257 258 Source data in vanguard form now uses the %z notation, introduced 259 in release 2015f. For example, for America/Sao_Paulo vanguard 260 form contains the zone continuation line "-3:00 Brazil %z", which 261 is simpler and more reliable than the line "-3:00 Brazil -03/-02" 262 used in main and rearguard forms. The plan is for the main form 263 to use %z eventually; in the meantime maintainers of zi parsers 264 are encouraged to test the parsers on vanguard.zi. 265 266 The Makefile has a new PACKRATLIST option to select a subset of 267 'backzone'. For example, 'make PACKRATDATA=backzone 268 PACKRATLIST=zone.tab' now generates TZif files identical to those 269 of the global-tz project. 270 271 The Makefile has a new tailored_tarballs target for generating 272 special-purpose tarballs. It generalizes and replaces the 273 rearguard_tarballs target and related targets and macros, which 274 are now obsolescent. 275 276 'make install' now defaults LOCALTIME to Factory not GMT, 277 which means the default abbreviation is now "-00" not "GMT". 278 279 Remove the posix_packrat target, marked obsolescent in 2016a. 280 281 282 Release 2022a - 2022-03-15 23:02:01 -0700 283 284 Briefly: 285 Palestine will spring forward on 2022-03-27, not -03-26. 286 zdump -v now outputs better failure indications. 287 Bug fixes for code that reads corrupted TZif data. 288 289 Changes to future timestamps 290 291 Palestine will spring forward on 2022-03-27, not 2022-03-26. 292 (Thanks to Heba Hamad.) Predict future transitions for first 293 Sunday >= March 25. Additionally, predict fallbacks to be the first 294 Friday on or after October 23, not October's last Friday, to be more 295 consistent with recent practice. The first differing fallback 296 prediction is on 2025-10-24, not 2025-10-31. 297 298 Changes to past timestamps 299 300 From 1992 through spring 1996, Ukraine's DST transitions were at 301 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) 302 303 Chile's Santiago Mean Time and its LMT precursor have been adjusted 304 eastward by 1 second to align with past and present law. 305 306 Changes to commentary 307 308 Add several references for Chile's 1946/1947 transitions, some of 309 which only affected portions of the country. 310 311 Changes to code 312 313 Fix bug when mktime gets confused by truncated TZif files with 314 unspecified local time. (Problem reported by Almaz Mingaleev.) 315 316 Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. 317 (Problem reported by Christos Zoulas.) 318 319 When reading a version 2 or later TZif file, the TZif reader now 320 validates the version 1 header and data block only enough to skip 321 over them, as recommended by RFC 8536 section 4. Also, the TZif 322 reader no longer mistakenly attempts to parse a version 1 TZIf 323 file header as a TZ string. 324 325 zdump -v now outputs "(localtime failed)" and "(gmtime failed)" 326 when local time and UT cannot be determined for a timestamp. 327 328 Changes to build procedure 329 330 Distribution tarballs now use standard POSIX.1-1988 ustar format 331 instead of GNU format. Although the formats are almost identical 332 for these tarballs, ustar headers' magic fields contain "ustar" 333 instead of "ustar ", and their version fields contain "00" instead 334 of " ". The two formats are planned to diverge more significantly 335 for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar 336 format becomes obsolete and the tarballs switch to pax format, an 337 extension of ustar. For details about these formats, please see 338 "pax - portable archive interchange", IEEE Std 1003.1-2017, 339 <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>. 340 341 342 Release 2021e - 2021-10-21 18:41:00 -0700 343 344 Changes to future timestamps 345 346 Palestine will fall back 10-29 (not 10-30) at 01:00. 347 (Thanks to P Chan and Heba Hemad.) 348 349 350 Release 2021d - 2021-10-15 13:48:18 -0700 351 352 Briefly: 353 Fiji suspends DST for the 2021/2022 season. 354 'zic -r' marks unspecified timestamps with "-00". 355 356 Changes to future timestamps 357 358 Fiji will suspend observance of DST for the 2021/2022 season. 359 Assume for now that it will return next year. (Thanks to Jashneel 360 Kumar and P Chan.) 361 362 Changes to code 363 364 'zic -r' now uses "-00" time zone abbreviations for intervals 365 with UT offsets that are unspecified due to -r truncation. 366 This implements a change in draft Internet RFC 8536bis. 367 368 369 Release 2021c - 2021-10-01 14:21:49 -0700 370 371 Briefly: 372 Revert most 2021b changes to 'backward'. 373 Fix 'zic -b fat' bug in pre-1970 32-bit data. 374 Fix two Link line typos. 375 Distribute SECURITY file. 376 377 This release is intended as a bugfix release, to fix compatibility 378 problems and typos reported since 2021b was released. 379 380 Changes to Link directives 381 382 Revert almost all of 2021b's changes to the 'backward' file, 383 by moving Link directives back to where they were in 2021a. 384 Although 'zic' doesn't care which source file contains a Link 385 directive, some downstream uses ran into trouble with the move. 386 (Problem reported by Stephen Colebourne for Joda-Time.) 387 388 Fix typo that linked Atlantic/Jan_Mayen to the wrong location 389 (problem reported by Chris Walton). 390 391 Fix 'backzone' typo that linked America/Virgin to the wrong 392 location (problem reported by Michael Deckers). 393 394 Changes to code 395 396 Fix a bug in 'zic -b fat' that caused old timestamps to be 397 mishandled in 32-bit-only readers (problem reported by Daniel 398 Fischer). 399 400 Changes to documentation 401 402 Distribute the SECURITY file (problem reported by Andreas Radke). 403 404 405 Release 2021b - 2021-09-24 16:23:00 -0700 406 407 Briefly: 408 Jordan now starts DST on February's last Thursday. 409 Samoa no longer observes DST. 410 Merge more location-based Zones whose timestamps agree since 1970. 411 Move some backward-compatibility links to 'backward'. 412 Rename Pacific/Enderbury to Pacific/Kanton. 413 Correct many pre-1993 transitions in Malawi, Portugal, etc. 414 zic now creates each output file or link atomically. 415 zic -L no longer omits the POSIX TZ string in its output. 416 zic fixes for truncation and leap second table expiration. 417 zic now follows POSIX for TZ strings using all-year DST. 418 Fix some localtime crashes and bugs in obscure cases. 419 zdump -v now outputs more-useful boundary cases. 420 tzfile.5 better matches a draft successor to RFC 8536. 421 A new file SECURITY. 422 423 This release is prompted by recent announcements by Jordan and Samoa. 424 It incorporates many other changes that had accumulated since 2021a. 425 However, it omits most proposed changes that merged all Zones 426 agreeing since 1970, as concerns were raised about doing too many of 427 these changes at once. It does keeps some of these changes in the 428 interest of making tzdb more equitable one step at a time; see 429 "Merge more location-based Zones" below. 430 431 Changes to future timestamps 432 433 Jordan now starts DST on February's last Thursday. 434 (Thanks to Steffen Thorsen.) 435 436 Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) 437 438 Changes to zone name 439 440 Rename Pacific/Enderbury to Pacific/Kanton. When we added 441 Enderbury in 1993, we did not know that it is uninhabited and that 442 Kanton (population two dozen) is the only inhabited location in 443 that timezone. The old name is now a backward-compatibility link. 444 445 Changes to past timestamps 446 447 Correct many pre-1993 transitions, fixing entries originally 448 derived from Shanks, Whitman, and Mundell. The fixes include: 449 - Barbados: standard time was introduced in 1911, not 1932; and 450 DST was observed in 1942-1944 451 - Cook Islands: In 1899 they switched from east to west of GMT, 452 celebrating Christmas for two days. They (and Niue) switched 453 to standard time in 1952, not 1901. 454 - Guyana: corrected LMT for Georgetown; the introduction of 455 standard time in 1911, not 1915; and corrections to 1975 and 456 1992 transitions 457 - Kanton: uninhabited before 1937-08-31 458 - Niue: only observed -11:20 from 1952 through 1964, then went to 459 -11 instead of -11:30 460 - Portugal: DST was observed in 1950 461 - Tonga: corrected LMT; the introduction of standard time in 1945, 462 not 1901; and corrections to the transition from +12:20 to +13 463 in 1961, not 1941 464 Additional fixes to entries in the 'backzone' file include: 465 - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 466 - The Gambia: 1933 and 1942 transitions 467 - Malawi: several 1911 through 1925 transitions 468 - Sierra Leone: several 1913 through 1941 transitions, and DST 469 was NOT observed in 1957 through 1962 470 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and 471 Alois Treindl.) 472 473 Merge more location-based Zones whose timestamps agree since 1970, 474 as pre-1970 timestamps are out of scope. This is part of a 475 process that has been ongoing since 2013. This does not affect 476 post-1970 timestamps, and timezone historians who build with 'make 477 PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. 478 When merging, keep the most-populous location's data, and move 479 data for other locations to 'backzone' with a backward 480 link in 'backward'. For example, move America/Creston data to 481 'backzone' with a link in 'backward' from America/Phoenix because 482 the two timezones' timestamps agree since 1970; this change 483 affects some pre-1968 timestamps in America/Creston because 484 Creston and Phoenix disagreed before 1968. The affected Zones 485 are Africa/Accra, America/Atikokan, America/Blanc-Sablon, 486 America/Creston, America/Curacao, America/Nassau, 487 America/Port_of_Spain, Antarctica/DumontDUrville, and 488 Antarctica/Syowa. 489 490 Changes to maintenance procedure 491 492 The new file SECURITY covers how to report security-related bugs. 493 494 Several backward-compatibility links have been moved to the 495 'backward' file. These links, which range from Africa/Addis_Ababa 496 to Pacific/Saipan, are only for compatibility with now-obsolete 497 guidelines suggesting an entry for every ISO 3166 code. 498 The intercontinental convenience links Asia/Istanbul and 499 Europe/Nicosia have also been moved to 'backward'. 500 501 Changes to code 502 503 zic now creates each output file or link atomically, 504 possibly by creating a temporary file and then renaming it. 505 This avoids races where a TZ setting would temporarily stop 506 working while zic was installing a replacement file or link. 507 508 zic -L no longer omits the POSIX TZ string in its output. 509 Starting with 2020a, zic -L truncated its output according to the 510 "Expires" directive or "#expires" comment in the leapseconds file. 511 The resulting TZif files omitted daylight saving transitions after 512 the leap second table expired, which led to far less-accurate 513 predictions of times after the expiry. Although future timestamps 514 cannot be converted accurately in the presence of leap seconds, it 515 is more accurate to convert near-future timestamps with a few 516 seconds error than with an hour error, so zic -L no longer 517 truncates output in this way. 518 519 Instead, when zic -L is given the "Expires" directive, it now 520 outputs the expiration by appending a no-change entry to the leap 521 second table. Although this should work well with most TZif 522 readers, it does not conform to Internet RFC 8536 and some pickier 523 clients (including tzdb 2017c through 2021a) reject it, so 524 "Expires" directives are currently disabled by default. To enable 525 them, set the EXPIRES_LINE Makefile variable. If a TZif file uses 526 this new feature it is marked with a new TZif version number 4, 527 a format intended to be documented in a successor to RFC 8536. 528 529 zic -L LEAPFILE -r @LO no longer generates an invalid TZif file 530 that omits leap second information for the range LO..B when LO 531 falls between two leap seconds A and B. Instead, it generates a 532 TZif version 4 file that represents the previously-missing 533 information. 534 535 The TZif reader now allows the leap second table to begin with a 536 correction other than -1 or +1, and to contain adjacent 537 transitions with equal corrections. This supports TZif version 4. 538 539 The TZif reader now lets leap seconds occur less than 28 days 540 apart. This supports possible future TZif extensions. 541 542 Fix bug that caused 'localtime' etc. to crash when TZ was 543 set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does 544 not conform to POSIX but does conform to Internet RFC 8536. 545 546 Fix another bug that caused 'localtime' etc. to crash when TZ was 547 set to a POSIX-conforming but unusual TZ string like 548 "EST5EDT4,0/0,J365/0", where almost all the year is DST. 549 550 Fix yet another bug that caused 'localtime' etc. to mishandle slim 551 TZif files containing leap seconds after the last explicit 552 transition in the table, or when handling far-future timestamps 553 in slim TZif files lacking leap seconds. 554 555 Fix localtime misbehavior involving positive leap seconds. 556 This change affects only behavior for "right" system time, 557 which contains leap seconds, and only if the UT offset is 558 not a multiple of 60 seconds when a positive leap second occurs. 559 (No such timezone exists in tzdb, luckily.) Without the fix, 560 the timestamp was ambiguous during a positive leap second. 561 With the fix, any seconds occurring after a positive leap second 562 and within the same localtime minute are counted through 60, not 563 through 59; their UT offset (tm_gmtoff) is the same as before. 564 Here is how the fix affects timestamps in a timezone with UT 565 offset +01:23:45 (5025 seconds) and with a positive leap second at 566 1972-06-30 23:59:60 UTC (78796800): 567 568 time_t without the fix with the fix 569 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 570 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 571 ... 572 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 573 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 574 575 Fix an unlikely bug that caused 'localtime' etc. to misbehave if 576 civil time changes a few seconds before time_t wraps around, when 577 leap seconds are enabled. 578 579 Fix bug in zic -r; in some cases, the dummy time type after the 580 last time transition disagreed with the TZ string, contrary to 581 Internet RFC 8563 section 3.3. 582 583 Fix a bug with 'zic -r @X' when X is a negative leap second that 584 has a nonnegative correction. Without the fix, the output file 585 was truncated so that X appeared to be a positive leap second. 586 Fix a similar, even-less-likely bug when truncating at a positive 587 leap second that has a nonpositive correction. 588 589 zic -r now reports an error if given rolling leap seconds, as this 590 usage has never generally worked and is evidently unused. 591 592 zic now generates a POSIX-conforming TZ string for TZif files 593 where all-year DST is predicted for the indefinite future. 594 For example, for all-year Eastern Daylight Time, zic now generates 595 "XXX3EDT4,0/0,J365/23" where it previously generated 596 "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for 597 noting the possibility of POSIX conformance.) 598 599 zic.c no longer requires sys/wait.h (thanks to spazmodius for 600 noting it wasn't needed). 601 602 When reading slim TZif files, zdump no longer mishandles leap 603 seconds on the rare platforms where time_t counts leap seconds, 604 fixing a bug introduced in 2014g. 605 606 zdump -v now outputs timestamps at boundaries of what localtime 607 and gmtime can represent, instead of the less-useful timestamps 608 one day after the minimum and one day before the maximum. 609 (Thanks to Arthur David Olson for prototype code, and to Manuela 610 Friedrich for debugging help.) 611 612 zdump's -c and -t options are now consistently inclusive for the 613 lower time bound and exclusive for the upper. Formerly they were 614 inconsistent. (Confusion noted by Martin Burnicki.) 615 616 Changes to build procedure 617 618 You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to 619 non-POSIX hosts where malloc doesn't set errno. 620 (Problem reported by Jan Engelhardt.) 621 622 Changes to documentation 623 624 tzfile.5 better matches a draft successor to RFC 8536 625 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>. 626 627 628 Release 2021a - 2021-01-24 10:54:57 -0800 629 630 Changes to future timestamps 631 632 South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. 633 (Thanks to Steffen Thorsen.) 634 635 636 Release 2020f - 2020-12-29 00:17:46 -0800 637 638 Change to build procedure 639 640 'make rearguard_tarballs' no longer generates a bad rearguard.zi, 641 fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) 642 643 644 Release 2020e - 2020-12-22 15:14:34 -0800 645 646 Briefly: 647 Volgograd switches to Moscow time on 2020-12-27 at 02:00. 648 649 Changes to future timestamps 650 651 Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. 652 (Thanks to Alexander Krivenyshev and Stepan Golosunov.) 653 654 Changes to past timestamps 655 656 Correct many pre-1986 transitions, fixing entries originally 657 derived from Shanks. The fixes include: 658 - Australia: several 1917 through 1971 transitions 659 - The Bahamas: several 1941 through 1945 transitions 660 - Bermuda: several 1917 through 1956 transitions 661 - Belize: several 1942 through 1968 transitions 662 - Ghana: several 1915 through 1956 transitions 663 - Israel and Palestine: several 1940 through 1985 transitions 664 - Kenya and adjacent: several 1908 through 1960 transitions 665 - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 666 through 1919 transitions 667 - Seychelles: the introduction of standard time in 1907, not 1906 668 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition 669 (Thanks to P Chan.) 670 671 Because of the Australia change, Australia/Currie (King Island) is 672 no longer needed, as it is identical to Australia/Hobart for all 673 timestamps since 1970 and was therefore created by mistake. 674 Australia/Currie has been moved to the 'backward' file and its 675 corrected data moved to the 'backzone' file. 676 677 Changes to past time zone abbreviations and DST flags 678 679 To better match legislation in Turks and Caicos, the 2015 shift to 680 year-round observance of -04 is now modeled as AST throughout before 681 returning to Eastern Time with US DST in 2018, rather than as 682 maintaining EDT until 2015-11-01. (Thanks to P Chan.) 683 684 Changes to documentation 685 686 The zic man page now documents zic's coalescing of transitions 687 when a zone falls back just before DST springs forward. 688 689 690 Release 2020d - 2020-10-21 11:24:13 -0700 691 692 Briefly: 693 Palestine ends DST earlier than predicted, on 2020-10-24. 694 695 Changes to past and future timestamps 696 697 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 698 as previously predicted (thanks to Sharef Mustafa.) Its 699 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen 700 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and 701 its spring 2020 transition was on March 28 at 00:00, not March 27 702 (thanks to Pierre Cashon.) This affects Asia/Gaza and 703 Asia/Hebron. Assume future spring and fall transitions will be on 704 the Saturday preceding the last Sunday of March and October, 705 respectively. 706 707 708 Release 2020c - 2020-10-16 11:15:53 -0700 709 710 Briefly: 711 Fiji starts DST later than usual, on 2020-12-20. 712 713 Changes to future timestamps 714 715 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as 716 previously predicted. DST will still end on 2021-01-17. 717 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that 718 the later-than-usual start date is a one-time departure from the 719 recent pattern. 720 721 Changes to build procedure 722 723 Rearguard tarballs now contain an empty file pacificnew. 724 Some older downstream software expects this file to exist. 725 (Problem reported by Mike Cullinan.) 726 727 728 Release 2020b - 2020-10-06 18:35:04 -0700 729 730 Briefly: 731 Revised predictions for Morocco's changes starting in 2023. 732 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. 733 Macquarie Island has stayed in sync with Tasmania since 2011. 734 Casey, Antarctica is at +08 in winter and +11 in summer. 735 zic no longer supports -y, nor the TYPE field of Rules. 736 737 Changes to future timestamps 738 739 Morocco's spring-forward after Ramadan is now predicted to occur 740 no sooner than two days after Ramadan, instead of one day. 741 (Thanks to Milamber.) The first altered prediction is for 2023, 742 now predicted to spring-forward on April 30 instead of April 23. 743 744 Changes to past and future timestamps 745 746 Casey Station, Antarctica has been using +08 in winter and +11 in 747 summer since 2018. The most recent transition from +08 to +11 was 748 2020-10-04 00:01. Also, Macquarie Island has been staying in 749 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) 750 751 Changes to past and future time zone abbreviations and DST flags 752 753 Canada's Yukon, represented by America/Whitehorse and 754 America/Dawson, changes its time zone rules from -08/-07 to 755 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. 756 This change affects only the time zone abbreviation (MST vs PDT) 757 and daylight saving flag for the period between the two dates. 758 (Thanks to Andrew G. Smith.) 759 760 Changes to past timestamps 761 762 Correct several transitions for Hungary for 1918/1983. 763 For example, the 1983-09-25 fall-back was at 01:00, not 03:00. 764 (Thanks to Gza Nyry.) Also, the 1890 transition to standard 765 time was on 11-01, not 10-01 (thanks to Michael Deckers). 766 767 The 1891 French transition was on March 16, not March 15. The 768 1911-03-11 French transition was at midnight, not a minute later. 769 Monaco's transitions were on 1892-06-01 and 1911-03-29, not 770 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) 771 772 Changes to code 773 774 Support for zic's long-obsolete '-y YEARISTYPE' option has been 775 removed and, with it, so has support for the TYPE field in Rule 776 lines, which is now reserved for compatibility with earlier zic. 777 These features were previously deprecated in release 2015f. 778 (Thanks to Tim Parenti.) 779 780 zic now defaults to '-b slim' instead of to '-b fat'. 781 782 zic's new '-l -' and '-p -' options uninstall any existing 783 localtime and posixrules files, respectively. 784 785 The undocumented and ineffective tzsetwall function has been 786 removed. 787 788 Changes to build procedure 789 790 The Makefile now defaults POSIXRULES to '-', so the posixrules 791 feature (obsolete as of 2019b) is no longer installed by default. 792 793 Changes to documentation and commentary 794 795 The long-obsolete files pacificnew, systemv, and yearistype.sh have 796 been removed from the distribution. (Thanks to Tim Parenti.) 797 798 799 Release 2020a - 2020-04-23 16:03:47 -0700 800 801 Briefly: 802 Morocco springs forward on 2020-05-31, not 2020-05-24. 803 Canada's Yukon advanced to -07 year-round on 2020-03-08. 804 America/Nuuk renamed from America/Godthab. 805 zic now supports expiration dates for leap second lists. 806 807 Changes to future timestamps 808 809 Morocco's second spring-forward transition in 2020 will be May 31, 810 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) 811 Adjust future-year predictions to use the first Sunday after the 812 day after Ramadan, not the first Sunday after Ramadan. 813 814 Canada's Yukon, represented by America/Whitehorse and 815 America/Dawson, advanced to -07 year-round, beginning with its 816 spring-forward transition on 2020-03-08, and will not fall back on 817 2020-11-01. Although a government press release calls this 818 "permanent Pacific Daylight Saving Time", we prefer MST for 819 consistency with nearby Dawson Creek, Creston, and Fort Nelson. 820 (Thanks to Tim Parenti.) 821 822 Changes to past timestamps 823 824 Shanghai observed DST in 1919. (Thanks to Phake Nick.) 825 826 Changes to timezone identifiers 827 828 To reflect current usage in English better, America/Godthab has 829 been renamed to America/Nuuk. A backwards-compatibility link 830 remains for the old name. 831 832 Changes to code 833 834 localtime.c no longer mishandles timestamps after the last 835 transition in a TZif file with leap seconds and with daylight 836 saving time transitions projected into the indefinite future. 837 For example, with TZ='America/Los_Angeles' with leap seconds, 838 zdump formerly reported a DST transition on 2038-03-14 839 from 01:59:32.999... to 02:59:33 instead of the correct transition 840 from 01:59:59.999... to 03:00:00. 841 842 zic -L now supports an Expires line in the leapseconds file, and 843 truncates the TZif output accordingly. This propagates leap 844 second expiration information into the TZif file, and avoids the 845 abovementioned localtime.c bug as well as similar bugs present in 846 many client implementations. If no Expires line is present, zic 847 -L instead truncates the TZif output based on the #expires comment 848 present in leapseconds files distributed by tzdb 2018f and later; 849 however, this usage is obsolescent. For now, the distributed 850 leapseconds file has an Expires line that is commented out, so 851 that the file can be fed to older versions of zic which ignore the 852 commented-out line. Future tzdb distributions are planned to 853 contain a leapseconds file with an Expires line. 854 855 The configuration macros HAVE_TZNAME and USG_COMPAT should now be 856 set to 1 if the system library supports the feature, and 2 if not. 857 As before, these macros are nonzero if tzcode should support the 858 feature, zero otherwise. 859 860 The configuration macro ALTZONE now has the same values with the 861 same meaning as HAVE_TZNAME and USG_COMPAT. 862 863 The code's defense against CRLF in leap-seconds.list is now 864 portable to POSIX awk. (Problem reported by Deborah Goldsmith.) 865 866 Although the undocumented tzsetwall function is not changed in 867 this release, it is now deprecated in preparation for removal in 868 future releases. Due to POSIX requirements, tzsetwall has not 869 worked for some time. Any code that uses it should instead use 870 tzalloc(NULL) or, if portability trumps thread-safety, should 871 unset the TZ environment variable. 872 873 Changes to commentary 874 875 The les-de-la-Madeleine and the Listuguj reserve are noted as 876 following America/Halifax, and comments about Yukon's "south" and 877 "north" have been corrected to say "east" and "west". (Thanks to 878 Jeffery Nichols.) 879 880 881 Release 2019c - 2019-09-11 08:59:48 -0700 882 883 Briefly: 884 Fiji observes DST from 2019-11-10 to 2020-01-12. 885 Norfolk Island starts observing Australian-style DST. 886 887 Changes to future timestamps 888 889 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 890 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) 891 Adjust future guesses accordingly. 892 893 Norfolk Island will observe Australian-style DST starting in 894 spring 2019. The first transition is on 2019-10-06. (Thanks to 895 Kyle Czech and Michael Deckers.) 896 897 Changes to past timestamps 898 899 Many corrections to time in Turkey from 1940 through 1985. 900 (Thanks to Oya Vula via Alois Treindl, and to Kvan Yazan.) 901 902 The Norfolk Island 1975-03-02 transition was at 02:00 standard 903 time, not 02:00 DST. (Thanks to Michael Deckers.) 904 905 South Korea observed DST from 1948 through 1951. Although this 906 info was supposed to appear in release 2014j, a typo inadvertently 907 suppressed the change. (Thanks to Alois Treindl.) 908 909 Detroit observed DST in 1967 and 1968 following the US DST rules, 910 except that its 1967 DST began on June 14 at 00:01. (Thanks to 911 Alois Treindl for pointing out that the old data entries were 912 probably wrong.) 913 914 Fix several errors in pre-1970 transitions in Perry County, IN. 915 (Thanks to Alois Treindl for pointing out the 1967/9 errors.) 916 917 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver 918 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 919 10-06. In 1945 Knigsberg (now Kaliningrad) switched from +01/+02 920 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated 921 EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 922 Knigsberg switched to +03 on 04-07 not 01-01. 923 924 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 925 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) 926 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. 927 928 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. 929 (Thanks to Michael Deckers.) 930 931 Changes to past time zone abbreviations and DST flags 932 933 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, 934 is now flagged as DST and is abbreviated HKWT not HKT. 935 936 Changes to code 937 938 leapseconds.awk now relies only on its input data, rather than 939 also relying on its comments. (Inspired by code from Dennis 940 Ferguson and Chris Woodbury.) 941 942 The code now defends against CRLFs in leap-seconds.list. 943 (Thanks to Brian Inglis and Chris Woodbury.) 944 945 Changes to documentation and commentary 946 947 theory.html discusses leap seconds. (Thanks to Steve Summit.) 948 949 Nashville's newspapers dueled about the time of day in the 1950s. 950 (Thanks to John Seigenthaler.) 951 952 Liechtenstein observed Swiss DST in 1941/2. 953 (Thanks to Alois Treindl.) 954 955 956 Release 2019b - 2019-07-01 00:09:53 -0700 957 958 Briefly: 959 Brazil no longer observes DST. 960 'zic -b slim' outputs smaller TZif files; please try it out. 961 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 962 963 Changes to future timestamps 964 965 Brazil has canceled DST and will stay on standard time indefinitely. 966 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 967 Oliveira.) 968 969 Predictions for Morocco now go through 2087 instead of 2037, to 970 work around a problem on newlib when using TZif files output by 971 zic 2019a or earlier. (Problem reported by David Gauchard.) 972 973 Changes to past and future timestamps 974 975 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 976 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 977 future transitions to be March's last Friday at 00:00. 978 979 Changes to past timestamps 980 981 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 982 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 983 not 09-15 at 00:00. In 1946 its spring-forward transition was on 984 04-21 at 00:00, not the previous day at 03:30. From 1946 through 985 1952 its fall-back transitions occurred at 04:30, not at 03:30. 986 In 1947 its fall-back transition was on 11-30, not 12-30. 987 (Thanks to P Chan.) 988 989 Changes to past time zone abbreviations 990 991 Italy's 1866 transition to Rome Mean Time was on December 12, not 992 September 22. This affects only the time zone abbreviation for 993 Europe/Rome between those dates. (Thanks to Stephen Trainor and 994 Luigi Rosa.) 995 996 Changes affecting metadata only 997 998 Add info about the Crimea situation in zone1970.tab and zone.tab. 999 (Problem reported by Serhii Demediuk.) 1000 1001 Changes to code 1002 1003 zic's new -b option supports a way to control data bloat and to 1004 test for year-2038 bugs in software that reads TZif files. 1005 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 1006 for example, changing from fat to slim shrinks the Europe/London 1007 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 1008 files represent the same set of timestamps and use the same TZif 1009 format as documented in tzfile(5) and in Internet RFC 8536. 1010 Fat format attempts to work around bugs or incompatibilities in 1011 older software, notably software that mishandles 64-bit TZif data 1012 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 1013 Slim format is more efficient and does not work around 64-bit bugs 1014 or obsolete TZ strings. Currently zic defaults to fat format 1015 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 1016 out-of-the-box default is intended to change in future releases 1017 as the buggy software often mishandles timestamps anyway. 1018 1019 zic no longer treats a set of rules ending in 2037 specially. 1020 Previously, zic assumed that such a ruleset meant that future 1021 timestamps could not be predicted, and therefore omitted a 1022 POSIX-like TZ string in the TZif output. The old behavior is no 1023 longer needed for current tzdata, and caused problems with newlib 1024 when used with older tzdata (reported by David Gauchard). 1025 1026 zic no longer generates some artifact transitions. For example, 1027 Europe/London no longer has a no-op transition in January 1996. 1028 1029 Changes to build procedure 1030 1031 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 1032 by a percent or so. 1033 1034 Changes to documentation and commentary 1035 1036 The Makefile now documents the POSIXRULES macro as being obsolete, 1037 and similarly, zic's -p POSIXRULES option is now documented as 1038 being obsolete. Although the POSIXRULES feature still exists and 1039 works as before, in practice it is rarely used for its intended 1040 purpose, and it does not work either in the default reference 1041 implementation (for timestamps after 2037) or in common 1042 implementations such as GNU/Linux (for contemporary timestamps). 1043 Since POSIXRULES was designed primarily as a temporary transition 1044 facility for System V platforms that died off decades ago, it is 1045 being decommissioned rather than institutionalized. 1046 1047 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 1048 1049 1050 Release 2019a - 2019-03-25 22:01:33 -0700 1051 1052 Briefly: 1053 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 1054 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 1055 1056 Changes to past and future timestamps 1057 1058 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 1059 previously predicted. Adjust our prediction by guessing that spring 1060 transitions will be between 24 and 30 March, which matches recent practice 1061 since 2016. (Thanks to Even Scharning and Tim Parenti.) 1062 1063 Metlakatla ended its observance of Pacific standard time, 1064 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 1065 Stanley and Tim Parenti.) 1066 1067 Changes to past timestamps 1068 1069 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 1070 (Thanks to Alois Treindl and Isaac Starkman.) 1071 1072 Changes to time zone abbreviations 1073 1074 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 1075 of being a separate zone that generates the abbreviation "UCT", 1076 which nowadays is typically a typo. (Problem reported by Isiah 1077 Meadows.) 1078 1079 Changes to code 1080 1081 zic now has an -r option to limit the time range of output data. 1082 For example, 'zic -r @1000000000' limits the output data to 1083 timestamps starting 1000000000 seconds after the Epoch. 1084 This helps shrink output size and can be useful for applications 1085 not needing the full timestamp history, such as TZDIST truncation; 1086 see Internet RFC 8536 section 5.1. (Inspired by a feature request 1087 from Christopher Wong, helped along by bug reports from Wong and 1088 from Tim Parenti.) 1089 1090 Changes to documentation 1091 1092 Mention Internet RFC 8536 (February 2019), which documents TZif. 1093 1094 tz-link.html now cites tzdata-meta 1095 <https://tzdata-meta.timtimeonline.com/>. 1096 1097 1098 Release 2018i - 2018-12-30 11:05:43 -0800 1099 1100 Briefly: 1101 So Tom and Prncipe switches from +01 to +00 on 2019-01-01. 1102 1103 Changes to future timestamps 1104 1105 Due to a change in government, So Tom and Prncipe switches back 1106 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 1107 Nasardinov and Michael Deckers.) 1108 1109 1110 Release 2018h - 2018-12-23 17:59:32 -0800 1111 1112 Briefly: 1113 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 1114 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 1115 Metlakatla, Alaska observes PST this winter only. 1116 Guess Morocco will continue to adjust clocks around Ramadan. 1117 Add predictions for Iran from 2038 through 2090. 1118 1119 Changes to future timestamps 1120 1121 Guess that Morocco will continue to fall back just before and 1122 spring forward just after Ramadan, the practice since 2012. 1123 (Thanks to Maamar Abdelkader.) This means Morocco will observe 1124 negative DST during Ramadan in main and vanguard formats, and in 1125 rearguard format it stays in the +00 timezone and observes 1126 ordinary DST in all months other than Ramadan. As before, extend 1127 this guesswork to the year 2037. As a consequence, Morocco is 1128 scheduled to observe three DST transitions in some Gregorian years 1129 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 1130 calendars. 1131 1132 The table of exact transitions for Iranian DST has been extended. 1133 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 1134 It now cuts off before 2091 as there is doubt about how the Persian 1135 calendar will treat 2091. This change predicts DST transitions in 1136 2038-9, 2042-3, and 2046-7 to occur one day later than previously 1137 predicted. As before, post-cutoff transitions are approximated. 1138 1139 Changes to past and future timestamps 1140 1141 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 1142 +05 on 2018-12-21. This is a zone split as Qostanay (aka 1143 Kostanay) did not switch, so create a zone Asia/Qostanay. 1144 1145 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 1146 It did not change clocks that day and remains on -08 this winter. 1147 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 1148 rules next spring, so this change affects only timestamps 1149 from 2018-11-04 through 2019-03-10. 1150 1151 Change to past timestamps 1152 1153 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 1154 not 00:00. I transcribed the time incorrectly from Shanks. 1155 (Thanks to Phake Nick.) 1156 1157 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 1158 (Thanks to Phake Nick.) 1159 1160 Guam observed DST irregularly from 1959 through 1977. 1161 (Thanks to Phake Nick.) 1162 1163 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 1164 10-01 changed standard time to +08:30 (not +08). Its transition 1165 back to +08 after WWII was on 1945-09-15, not the previous day. 1166 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 1167 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 1168 its 1952 fallback was on 11-02 (not 10-25). 1169 1170 This release contains many changes to timestamps before 1946 due 1171 to Japanese possession or occupation of Pacific/Chuuk, 1172 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 1173 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 1174 (Thanks to Phake Nick.) 1175 1176 Assume that the Spanish East Indies was like the Philippines and 1177 observed American time until the end of 1844. This affects 1178 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 1179 1180 Changes to past tm_isdst flags 1181 1182 For the recent Morocco change, the tm_isdst flag should be 1 from 1183 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 1184 Give a URL to the official decree. (Thanks to Matt Johnson.) 1185 1186 1187 Release 2018g - 2018-10-26 22:22:45 -0700 1188 1189 Briefly: 1190 Morocco switches to permanent +01 on 2018-10-28. 1191 1192 Changes to future timestamps 1193 1194 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 1195 so its clocks will not fall back as previously scheduled. 1196 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 1197 1198 Changes to code 1199 1200 When generating TZif files with leap seconds, zic no longer uses a 1201 format that trips up older 32-bit clients, fixing a bug introduced 1202 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 1203 for QTBUG-53071 now also works for TZif files with leap seconds. 1204 1205 The translator to rearguard format now rewrites the line 1206 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 1207 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 1208 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 1209 and earlier. (Reported by Christos Zoulas.) 1210 1211 Changes to past time zone abbreviations 1212 1213 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 1214 This reverts to 2011h, as the abbreviation change in 2011i was 1215 likely inadvertent. 1216 1217 Changes to documentation 1218 1219 tzfile.5 has new sections on interoperability issues. 1220 1221 1222 Release 2018f - 2018-10-18 00:14:18 -0700 1223 1224 Briefly: 1225 Volgograd moves from +03 to +04 on 2018-10-28. 1226 Fiji ends DST 2019-01-13, not 2019-01-20. 1227 Most of Chile changes DST dates, effective 2019-04-06. 1228 1229 Changes to future timestamps 1230 1231 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 1232 (Thanks to Alexander Fetisov and Stepan Golosunov.) 1233 1234 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 1235 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 1236 accordingly. 1237 1238 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 1239 time, and resume DST on the first Saturday in September at 24:00 mainland 1240 time. The changes are effective from 2019-04-06, and do not affect the 1241 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 1242 and Tim Parenti.) Adjust future predictions accordingly. 1243 1244 Changes to past timestamps 1245 1246 The 2018-05-05 North Korea 30-minute time zone change took place 1247 at 23:30 the previous day, not at 00:00 that day. 1248 1249 China's 1988 spring-forward transition was on April 17, not 1250 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 1251 (Thanks to P Chan.) 1252 1253 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 1254 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 1255 temporarily switched to +09/+10 during World War II. Macau 1256 observed DST in 1942/79, not 1961/80, and there were several 1257 errors for transition times and dates. (Thanks to P Chan.) 1258 1259 The 1948-1951 fallback transitions in Japan were at 25:00 on 1260 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 1261 zic turns this into 01:00 on the day after September's second 1262 Saturday, which is the best that POSIX or C platforms can do. 1263 1264 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 1265 paper by Li Yu, replacing more-questionable data from Shanks. 1266 1267 Changes to time zone abbreviations 1268 1269 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 1270 1271 Changes to code 1272 1273 zic now always generates TZif files where time type 0 is used for 1274 timestamps before the first transition. This simplifies the 1275 reading of TZif files and should not affect behavior of existing 1276 TZif readers because the same set of time types is used; only 1277 their internal indexes may have changed. This affects only the 1278 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 1279 EET, which previously used nonzero types for these timestamps. 1280 1281 Because of the type 0 change, zic no longer outputs a dummy 1282 transition at time -2**59 (before the Big Bang), as clients should 1283 no longer need this to handle historical timestamps correctly. 1284 This reverts a change introduced in 2013d and shrinks most TZif 1285 files by a few bytes. 1286 1287 zic now supports negative time-of-day in Rule and Leap lines, e.g., 1288 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 1289 occurs at 18:00 on the Saturday before the last Sunday in April. 1290 This behavior was documented in 2018a but the code did not 1291 entirely match the documentation. 1292 1293 localtime.c no longer requires at least one time type in TZif 1294 files that lack transitions or have a POSIX-style TZ string. This 1295 future-proofs the code against possible future extensions to the 1296 format that would allow TZif files with POSIX-style TZ strings and 1297 without transitions or time types. 1298 1299 A read-access subscript error in localtime.c has been fixed. 1300 It could occur only in TZif files with timecnt == 0, something that 1301 does not happen in practice now but could happen in future versions. 1302 1303 localtime.c no longer ignores TZif POSIX-style TZ strings that 1304 specify only standard time. Instead, these TZ strings now 1305 override the default time type for timestamps after the last 1306 transition (or for all timestamps if there are no transitions), 1307 just as DST strings specifying DST have always done. 1308 1309 leapseconds.awk now outputs "#updated" and "#expires" comments, 1310 and supports leap seconds at the ends of months other than June 1311 and December. (Inspired by suggestions from Chris Woodbury.) 1312 1313 Changes to documentation 1314 1315 New restrictions: A Rule name must start with a character that 1316 is neither an ASCII digit nor "-" nor "+", and an unquoted name 1317 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 1318 The latter restriction makes room for future extensions (a 1319 possibility noted by Tom Lane). 1320 1321 tzfile.5 now documents what time types apply before the first and 1322 after the last transition, if any. 1323 1324 Documentation now uses the spelling "timezone" for a TZ setting 1325 that determines timestamp history, and "time zone" for a 1326 geographic region currently sharing the same standard time. 1327 1328 The name "TZif" is now used for the tz binary data format. 1329 1330 tz-link.htm now mentions the A0 TimeZone Migration utilities. 1331 (Thanks to Aldrin Martoq for the link.) 1332 1333 Changes to build procedure 1334 1335 New 'make' target 'rearguard_tarballs' to build the rearguard 1336 tarball only. This is a convenience on platforms that lack lzip 1337 if you want to build the rearguard tarball. (Problem reported by 1338 Deborah Goldsmith.) 1339 1340 tzdata.zi is now more stable from release to release. (Problem 1341 noted by Tom Lane.) It is also a bit shorter. 1342 1343 tzdata.zi now can contain comment lines documenting configuration 1344 information, such as which data format was selected, which input 1345 files were used, and how leap seconds are treated. (Problems 1346 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 1347 are used these comment lines are absent, for backward 1348 compatibility. A redistributor intending to alter its copy of the 1349 files should also append "-LABEL" to the 'version' file's first 1350 line, where "LABEL" identifies the redistributor's change. 1351 1352 1353 Release 2018e - 2018-05-01 23:42:51 -0700 1354 1355 Briefly: 1356 1357 North Korea switches back to +09 on 2018-05-05. 1358 The main format uses negative DST again, for Ireland etc. 1359 'make tarballs' now also builds a rearguard tarball. 1360 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 1361 1362 Changes to past and future timestamps 1363 1364 North Korea switches back from +0830 to +09 on 2018-05-05. 1365 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 1366 and Tim Parenti.) 1367 1368 Bring back the negative-DST changes of 2018a, except be more 1369 compatible with data parsers that do not support negative DST. 1370 Also, this now affects historical timestamps in Namibia and the 1371 former Czechoslovakia, not just Ireland. The main format now uses 1372 negative DST to model timestamps in Europe/Dublin (from 1971 on), 1373 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 1374 does not affect UT offsets, only time zone abbreviations and the 1375 tm_isdst flag. Also, this does not affect rearguard or vanguard 1376 formats; effectively the main format now uses vanguard instead of 1377 rearguard format. Data parsers that do not support negative DST 1378 can still use data from the rearguard tarball described below. 1379 1380 Changes to build procedure 1381 1382 The command 'make tarballs' now also builds the tarball 1383 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 1384 except that it uses rearguard format intended for trailing-edge 1385 data parsers. 1386 1387 Changes to data format and to code 1388 1389 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 1390 suffix, which specifies whether the adjusted time is standard time 1391 or daylight saving time. If no suffix is given, daylight saving 1392 time is used if and only if the SAVE column is nonzero; this is 1393 the longstanding behavior. Although this new feature is not used 1394 in tzdata, it could be used to specify the legal time in Namibia 1395 1994-2017, as opposed to the popular time (see below). 1396 1397 Changes to past timestamps 1398 1399 From 1994 through 2017 Namibia observed DST in winter, not summer. 1400 That is, it used negative DST, as Ireland still does. This change 1401 does not affect UTC offsets; it affects only the tm_isdst flag and 1402 the abbreviation used during summer, which is now CAT, not WAST. 1403 Although (as noted by Michael Deckers) summer and winter time were 1404 both simply called "standard time" in Namibian law, in common 1405 practice winter time was considered to be DST (as noted by Stephen 1406 Colebourne). The full effect of this change is only in vanguard 1407 and main format; in rearguard format, the tm_isdst flag is still 1408 zero in winter and nonzero in summer. 1409 1410 In 1946/7 Czechoslovakia also observed negative DST in winter. 1411 The full effect of this change is only in vanguard and main 1412 formats; in rearguard format, it is modeled as plain GMT without 1413 daylight saving. Also, the dates of some 1944/5 DST transitions 1414 in Czechoslovakia have been changed. 1415 1416 1417 Release 2018d - 2018-03-22 07:05:46 -0700 1418 1419 Briefly: 1420 1421 Palestine starts DST a week earlier in 2018. 1422 Add support for vanguard and rearguard data consumers. 1423 Add subsecond precision to source data format, though not to data. 1424 1425 Changes to future timestamps 1426 1427 In 2018, Palestine starts DST on March 24, not March 31. 1428 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 1429 1430 Changes to past and future timestamps 1431 1432 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 1433 at 04:00. (Thanks to Steffen Thorsen.) 1434 1435 Changes to past timestamps 1436 1437 Historical transitions for Uruguay, represented by 1438 America/Montevideo, have been updated per official legal documents, 1439 replacing previous data mainly originating from the inventions of 1440 Shanks & Pottenger. This has resulted in adjustments ranging from 1441 30 to 90 minutes in either direction over at least two dozen 1442 distinct periods ranging from one day to several years in length. 1443 A mere handful of pre-1991 transitions are unaffected; data since 1444 then has come from more reliable contemporaneous reporting. These 1445 changes affect various timestamps in 1920-1923, 1936, 1939, 1446 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 1447 Additionally, Uruguay's pre-standard-time UT offset has been 1448 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 1449 match the location of the Observatory of the National Meteorological 1450 Institute in Montevideo. 1451 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 1452 1453 East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. 1454 (Thanks to Kerry Shetline.) 1455 1456 Fix the 1912-01-01 transition for Portugal and its colonies. 1457 This transition was at 00:00 according to the new UT offset, not 1458 according to the old one. Also assume that Cape Verde switched on 1459 the same date as the rest, not in 1907. This affects 1460 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 1461 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 1462 (Thanks to Michael Deckers.) 1463 1464 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 1465 Turks & Caicos. 1466 1467 Changes to past time zone abbreviations 1468 1469 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 1470 is no clock change associated with the transition. 1471 1472 Changes to build procedure 1473 1474 The new DATAFORM macro in the Makefile lets the installer choose 1475 among three source data formats. The idea is to lessen downstream 1476 disruption when data formats are improved. 1477 1478 * DATAFORM=vanguard installs from the latest, bleeding-edge 1479 format. DATAFORM=main (the default) installs from the format 1480 used in the 'africa' etc. files. DATAFORM=rearguard installs 1481 from a trailing-edge format. Eventually, elements of today's 1482 vanguard format should move to the main format, and similarly 1483 the main format's features should eventually move to the 1484 rearguard format. 1485 1486 * In the current version, the main and rearguard formats are 1487 identical and match that of 2018c, so this change does not 1488 affect default behavior. The vanguard format currently contains 1489 one feature not in the main format: negative SAVE values. This 1490 improves support for Ireland, which uses Irish Standard Time 1491 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 1492 supported negative SAVE values for decades, and this feature 1493 should move to the main format soon. However, it will not move 1494 to the rearguard format for quite some time because some 1495 downstream parsers do not support it. 1496 1497 * The build procedure constructs three files vanguard.zi, main.zi, 1498 and rearguard.zi, one for each format. Although the files 1499 represent essentially the same data, they may have minor 1500 discrepancies that users are not likely to notice. The files 1501 are intended for downstream data consumers and are not 1502 installed. Zoneinfo parsers that do not support negative SAVE values 1503 should start using rearguard.zi, so that they will be unaffected 1504 when the negative-DST feature moves from vanguard to main. 1505 Bleeding-edge Zoneinfo parsers that support the new features 1506 already can use vanguard.zi; in this respect, current tzcode is 1507 bleeding-edge. 1508 1509 The Makefile should now be safe for parallelized builds, and 'make 1510 -j to2050new.tzs' is now much faster on a multiprocessor host 1511 with GNU Make. 1512 1513 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 1514 prepends TZDIR/ to file names that do not begin with '/'. This is 1515 not recommended for general use, due to its security implications. 1516 (From a suggestion by Manuela Friedrich.) 1517 1518 Changes to code 1519 1520 zic now accepts subsecond precision in expressions like 1521 00:19:32.13, which is approximately the legal time of the 1522 Netherlands from 1835 to 1937. However, because it is 1523 questionable whether the few recorded uses of non-integer offsets 1524 had subsecond precision in practice, there are no plans for tzdata 1525 to use this feature. (Thanks to Steve Allen for pointing out 1526 the limitations of historical data in this area.) 1527 1528 The code is a bit more portable to MS-Windows. Installers can 1529 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 1530 reserve identifiers like 'localtime'. (Thanks to Manuela 1531 Friedrich.) 1532 1533 Changes to documentation and commentary 1534 1535 theory.html now outlines tzdb's extensions to POSIX's model for 1536 civil time, and has a section "POSIX features no longer needed" 1537 that lists POSIX API components that are now vestigial. 1538 (From suggestions by Steve Summit.) It also better distinguishes 1539 time zones from tz regions. (From a suggestion by Guy Harris.) 1540 1541 Commentary is now more consistent about using the phrase "daylight 1542 saving time", to match the C name tm_isdst. Daylight saving time 1543 need not occur in summer, and need not have a positive offset from 1544 standard time. 1545 1546 Commentary about historical transitions in Uruguay has been expanded 1547 with links to many relevant legal documents. 1548 (Thanks to Tim Parenti.) 1549 1550 Commentary now uses some non-ASCII characters with Unicode value 1551 less than U+0100, as they can be useful and should work even with 1552 older editors such as XEmacs. 1553 1554 1555 Release 2018c - 2018-01-22 23:00:44 -0800 1556 1557 Briefly: 1558 Revert Irish changes that relied on negative SAVE values. 1559 1560 Changes to tm_isdst 1561 1562 Revert the 2018a change to Europe/Dublin. As before, this change 1563 does not affect UT offsets or abbreviations; it affects only 1564 whether timestamps are considered to be standard time or 1565 daylight-saving time, as expressed in the tm_isdst flag of C's 1566 struct tm type. This reversion is intended to be a temporary 1567 workaround for problems discovered with downstream uses of 1568 releases 2018a and 2018b, which implemented Irish time by using 1569 negative SAVE values in the Eire rules of the 'europe' file. 1570 Although negative SAVE values have been part of tzcode for many 1571 years and are supported by many platforms, they were not 1572 documented before 2018a and ICU and OpenJDK do not currently 1573 support them. A mechanism to export data to platforms lacking 1574 support for negative DST is planned to be developed before the 1575 change is reapplied. (Problems reported by Deborah Goldsmith and 1576 Stephen Colebourne.) 1577 1578 Changes to past timestamps 1579 1580 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 1581 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 1582 1583 Changes to build procedure 1584 1585 The build procedure now works around mawk 1.3.3's lack of support 1586 for character class expressions. (Problem reported by Ohyama.) 1587 1588 1589 Release 2018b - 2018-01-17 23:24:48 -0800 1590 1591 Briefly: 1592 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 1593 1594 Changes to build procedure 1595 1596 The distribution now contains the file 'pacificnew' again. 1597 This file was inadvertently omitted in the 2018a distribution. 1598 (Problem reported by Matias Fonzo.) 1599 1600 1601 Release 2018a - 2018-01-12 22:29:21 -0800 1602 1603 Briefly: 1604 So Tom and Prncipe switched from +00 to +01. 1605 Brazil's DST will now start on November's first Sunday. 1606 Ireland's standard time is now in the summer, not the winter. 1607 Use Debian-style installation locations, instead of 4.3BSD-style. 1608 New zic option -t. 1609 1610 Changes to past and future timestamps 1611 1612 So Tom and Prncipe switched from +00 to +01 on 2018-01-01 at 1613 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 1614 1615 Changes to future timestamps 1616 1617 Starting in 2018 southern Brazil will begin DST on November's 1618 first Sunday instead of October's third Sunday. (Thanks to 1619 Steffen Thorsen.) 1620 1621 Changes to past timestamps 1622 1623 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 1624 been corrected. The 'backzone' and 'zone.tab' files did not agree 1625 with the 'africa' and 'zone1970.tab' files. (Problem reported by 1626 Michael Deckers.) 1627 1628 The abbreviation invented for Bolivia Summer Time (1931-2) is now 1629 BST instead of BOST, to be more consistent with the convention 1630 used for Latvian Summer Time (1918-9) and for British Summer Time. 1631 1632 Changes to tm_isdst 1633 1634 Change Europe/Dublin so that it observes Irish Standard Time (UT 1635 +01) in summer and GMT (as negative daylight-saving) in winter, 1636 instead of observing standard time (GMT) in winter and Irish 1637 Summer Time (UT +01) in summer. This change does not affect UT 1638 offsets or abbreviations; it affects only whether timestamps are 1639 considered to be standard time or daylight-saving time, as 1640 expressed in the tm_isdst flag of C's struct tm type. 1641 (Discrepancy noted by Derick Rethans.) 1642 1643 Changes to build procedure 1644 1645 The default installation locations have been changed to mostly 1646 match Debian circa 2017, instead of being designed as an add-on to 1647 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 1648 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 1649 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 1650 locations more precisely. (This responds to suggestions from 1651 Brian Inglis and from Steve Summit.) 1652 1653 The default installation procedure no longer creates the 1654 backward-compatibility link US/Pacific-New, which causes 1655 confusion during user setup (e.g., see Debian bug 815200). 1656 Use 'make BACKWARD="backward pacificnew"' to create the link 1657 anyway, for now. Eventually we plan to remove the link entirely. 1658 1659 tzdata.zi now contains a version-number comment. 1660 (Suggested by Tom Lane.) 1661 1662 The Makefile now quotes values like BACKWARD more carefully when 1663 passing them to the shell. (Problem reported by Zefram.) 1664 1665 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 1666 that have snprintf and use pre-C99 compilers. (Problem reported 1667 by Jon Skeet.) 1668 1669 Changes to code 1670 1671 zic has a new option -t FILE that specifies the location of the 1672 file that determines local time when TZ is unset. The default for 1673 this location can be configured via the new TZDEFAULT makefile 1674 macro, which defaults to /etc/localtime. 1675 1676 Diagnostics and commentary now distinguish UT from UTC more 1677 carefully; see theory.html for more information about UT vs UTC. 1678 1679 zic has been ported to GCC 8's -Wstringop-truncation option. 1680 (Problem reported by Martin Sebor.) 1681 1682 Changes to documentation and commentary 1683 1684 The zic man page now documents the longstanding behavior that 1685 times and years can be out of the usual range, with negative times 1686 counting backwards from midnight and with year 0 preceding year 1. 1687 (Problem reported by Michael Deckers.) 1688 1689 The theory.html file now mentions the POSIX limit of six chars 1690 per abbreviation, and lists alphabetic abbreviations used. 1691 1692 The files tz-art.htm and tz-link.htm have been renamed to 1693 tz-art.html and tz-link.html, respectively, for consistency with 1694 other file names and to simplify web server configuration. 1695 1696 1697 Release 2017c - 2017-10-20 14:49:34 -0700 1698 1699 Briefly: 1700 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 1701 Fiji ends DST 2018-01-14, not 2018-01-21. 1702 Namibia switches from +01/+02 to +02 on 2018-04-01. 1703 Sudan switches from +03 to +02 on 2017-11-01. 1704 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 1705 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 1706 A new file tzdata.zi now holds a small text copy of all data. 1707 The zic input format has been regularized slightly. 1708 1709 Changes to future timestamps 1710 1711 Northern Cyprus has decided to resume EU rules starting 1712 2017-10-29, thus reinstituting winter time. 1713 1714 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 1715 predicted. (Thanks to Dominic Fok.) Adjust future predictions 1716 accordingly. 1717 1718 Namibia will switch from +01 with DST to +02 all year on 1719 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 1720 at 02:00. (Thanks to Steffen Thorsen.) 1721 1722 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 1723 Atyya and Yahia Abdalla.) South Sudan is not switching, so 1724 Africa/Juba is no longer a link to Africa/Khartoum. 1725 1726 Tonga has likely ended its experiment with DST, and will not 1727 adjust its clocks on 2017-11-05. Although Tonga has not announced 1728 whether it will continue to observe DST, the IATA is assuming that 1729 it will not. (Thanks to David Wade.) 1730 1731 Turks & Caicos will switch from -04 all year to -05 with US DST on 1732 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 1733 at 02:00. (Thanks to Steffen Thorsen.) 1734 1735 Changes to past timestamps 1736 1737 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 1738 (Thanks to Arthur David Olson.) 1739 1740 Detroit did not observe DST in 1967. 1741 1742 Use railway time for Asia/Kolkata before 1941, by switching to 1743 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 1744 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 1745 1746 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 1747 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 1748 1749 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 1750 American time in 1892, not 1879. (Thanks to Michael Deckers.) 1751 1752 Adjust the 1867 transition in Alaska to better reflect the 1753 historical record, by changing it to occur on 1867-10-18 at 15:30 1754 Sitka time rather than at the start of 1867-10-17 local time. 1755 Although strictly speaking this is accurate only for Sitka, 1756 the rest of Alaska's blanks need to be filled in somehow. 1757 1758 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 1759 (Thanks to Michael Deckers.) 1760 1761 Add 7 s to the UT offset in Asia/Yangon before 1920. 1762 1763 Changes to zone names 1764 1765 Remove Canada/East-Saskatchewan from the 'backward' file, as it 1766 exceeded the 14-character limit and was an unused misnomer anyway. 1767 1768 Changes to build procedure 1769 1770 To support applications that prefer to read time zone data in text 1771 form, two zic input files tzdata.zi and leapseconds are now 1772 installed by default. The commands 'zic tzdata.zi' and 'zic -L 1773 leapseconds tzdata.zi' can reproduce the tzdata binary files 1774 without and with leap seconds, respectively. To prevent these two 1775 new files from being installed, use 'make TZDATA_TEXT=', and to 1776 suppress leap seconds from the tzdata text installation, use 'make 1777 TZDATA_TEXT=tzdata.zi'. 1778 1779 'make BACKWARD=' now suppresses backward-compatibility names 1780 like 'US/Pacific' that are defined in the 'backward' and 1781 'pacificnew' files. 1782 1783 'make check' now works on systems that lack a UTF-8 locale, 1784 or that lack the nsgmls program. Set UTF8_LOCALE to configure 1785 the name of a UTF-8 locale, if you have one. 1786 1787 Y2K runtime checks are no longer enabled by default. Add 1788 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 1789 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 1790 to disable them. (New name suggested by Brian Inglis.) 1791 1792 The build procedure for zdump now works on AIX 7.1. 1793 (Problem reported by Kees Dekker.) 1794 1795 Changes to code 1796 1797 zic and the reference runtime now reject multiple leap seconds 1798 within 28 days of each other, or leap seconds before the Epoch. 1799 As a result, support for double leap seconds, which was 1800 obsolescent and undocumented, has been removed. Double leap 1801 seconds were an error in the C89 standard; they have never existed 1802 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 1803 noticing glitches in the code that uncovered this problem.) 1804 1805 zic now warns about use of the obsolescent and undocumented -y 1806 option, and about use of the obsolescent TYPE field of Rule lines. 1807 1808 zic now allows unambiguous abbreviations like "Sa" and "Su" for 1809 weekdays; formerly it rejected them due to a bug. Conversely, zic 1810 no longer considers non-prefixes to be abbreviations; for example, 1811 it no longer accepts "lF" as an abbreviation for "lastFriday". 1812 Also, zic warns about the undocumented usage with a "last-" 1813 prefix, e.g., "last-Fri". 1814 1815 Similarly, zic now accepts the unambiguous abbreviation "L" for 1816 "Link" in ordinary context and for "Leap" in leap-second context. 1817 Conversely, zic no longer accepts non-prefixes such as "La" as 1818 abbreviations for words like "Leap". 1819 1820 zic no longer accepts leap second lines in ordinary input, or 1821 ordinary lines in leap second input. Formerly, zic sometimes 1822 warned about this undocumented usage and handled it incorrectly. 1823 1824 The new macro HAVE_TZNAME governs whether the tzname external 1825 variable is exported, instead of USG_COMPAT. USG_COMPAT now 1826 governs only the external variables "timezone" and "daylight". 1827 This change is needed because the three variables are not in the 1828 same category: although POSIX requires tzname, it specifies the 1829 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 1830 if not defined, the code attempts to guess it from other macros. 1831 1832 localtime.c and difftime.c no longer require stdio.h, and .c files 1833 other than zic.c no longer require sys/wait.h. 1834 1835 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 1836 1837 Calculation of time_t extrema works around a bug in GCC 4.8.4 1838 (Reported by Stan Shebs and Joseph Myers.) 1839 1840 zic.c no longer mistranslates formats of line numbers in non-English 1841 locales. (Problem reported by Benno Schulenberg.) 1842 1843 Several minor changes have been made to the code to make it a 1844 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 1845 Dekker for reporting the problems.) 1846 1847 Changes to documentation and commentary 1848 1849 The two new files 'theory.html' and 'calendars' contain the 1850 contents of the removed file 'Theory'. The goal is to document 1851 tzdb theory more accessibly. 1852 1853 The zic man page now documents abbreviation rules. 1854 1855 tz-link.htm now covers how to apply tzdata changes to clients. 1856 (Thanks to Jorge Fbregas for the AIX link.) It also mentions MySQL. 1857 1858 The leap-seconds.list URL has been updated to something that is 1859 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 1860 1861 Release 2017b - 2017-03-17 07:30:38 -0700 1862 1863 Briefly: Haiti has resumed DST. 1864 1865 Changes to past and future timestamps 1866 1867 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 1868 1869 Changes to past timestamps 1870 1871 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 1872 1873 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 1874 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 1875 1876 Changes to code 1877 1878 The reference localtime implementation now falls back on the 1879 current US daylight-saving transition rules rather than the 1880 1987-2006 rules. This fallback occurs only when (1) the TZ 1881 environment variable has a value like "AST4ADT" that asks 1882 for daylight saving time but does not specify the rules, (2) there 1883 is no file by that name, and (3) the TZDEFRULES file cannot be 1884 loaded. (Thanks to Tom Lane.) 1885 1886 1887 Release 2017a - 2017-02-28 00:05:36 -0800 1888 1889 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 1890 discontinues DST. 1891 1892 Changes to future timestamps 1893 1894 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 1895 1896 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 1897 Its clocks diverge from America/Santiago starting 2017-05-13 at 1898 23:00, hiving off a new zone America/Punta_Arenas. Although the 1899 Chilean government says this change expires in May 2019, for now 1900 assume it's permanent. (Thanks to Juan Correa and Deborah 1901 Goldsmith.) This also affects Antarctica/Palmer. 1902 1903 Changes to past timestamps 1904 1905 Fix many entries for historical timestamps for Europe/Madrid 1906 before 1979, to agree with tables compiled by Pere Planesas of the 1907 National Astronomical Observatory of Spain. As a side effect, 1908 this changes some timestamps for Africa/Ceuta before 1929, which 1909 are probably guesswork anyway. (Thanks to Steve Allen and 1910 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 1911 correcting the 1901 transition.) 1912 1913 Ecuador observed DST from 1992-11-28 to 1993-02-05. 1914 (Thanks to Alois Treindl.) 1915 1916 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 1917 (Thanks to Stepan Golosunov.) 1918 1919 Changes to past and future time zone abbreviations 1920 1921 Switch to numeric time zone abbreviations for South America, as 1922 part of the ongoing project of removing invented abbreviations. 1923 This avoids the need to invent an abbreviation for the new Chilean 1924 new zone. Similarly, switch from invented to numeric time zone 1925 abbreviations for Afghanistan, American Samoa, the Azores, 1926 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 1927 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 1928 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 1929 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 1930 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 1931 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 1932 Papua New Guinea, the Philippines, Pitcairn, Qatar, Runion, St 1933 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 1934 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 1935 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 1936 for half-hour daylight saving time in Belize before 1944 and in 1937 the Dominican Republic before 1975; and for Canary Islands before 1938 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 1939 Indian Summer Time before 1942, for Indonesia before around 1964, 1940 for Kenya before 1960, for Liberia before 1973, for Madeira before 1941 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 1942 Pakistan before 1971, for Western Sahara before 1977, and for 1943 Zaporozhye in 1880-1924. 1944 1945 For Alaska time from 1900 through 1967, instead of "CAT" use the 1946 abbreviation "AST", the abbreviation commonly used at the time 1947 (Atlantic Standard Time had not been standardized yet). Use "AWT" 1948 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 1949 1950 Use "CST" and "CDT" instead of invented abbreviations for Macau 1951 before 1999 and Taiwan before 1938, and use "JST" instead of the 1952 invented abbreviation "JCST" for Japan and Korea before 1938. 1953 1954 Change to database entry category 1955 1956 Move the Pacific/Johnston link from 'australasia' to 'backward', 1957 since Johnston is now uninhabited. 1958 1959 Changes to code 1960 1961 zic no longer mishandles some transitions in January 2038 when it 1962 attempts to work around Qt bug 53071. This fixes a bug affecting 1963 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 1964 now contains a workaround, useful when loading a file generated by 1965 a buggy zic. (Problem and localtime.c fix reported by Bradley 1966 White.) 1967 1968 zdump -i now outputs non-hour numeric time zone abbreviations 1969 without a colon, e.g., "+0530" rather than "+05:30". This agrees 1970 with zic %z and with common practice, and simplifies auditing of 1971 zdump output. 1972 1973 zdump is now buildable again with -DUSE_LTZ=0. 1974 (Problem reported by Joseph Myers.) 1975 1976 zdump.c now always includes private.h, to avoid code duplication 1977 with private.h. (Problem reported by Kees Dekker.) 1978 1979 localtime.c no longer mishandles early or late timestamps 1980 when TZ is set to a POSIX-style string that specifies DST. 1981 (Problem reported by Kees Dekker.) 1982 1983 date and strftime now cause %z to generate "-0000" instead of 1984 "+0000" when the UT offset is zero and the time zone abbreviation 1985 begins with "-". 1986 1987 Changes to documentation and commentary 1988 1989 The 'Theory' file now better documents choice of historical time 1990 zone abbreviations. (Problems reported by Michael Deckers.) 1991 1992 tz-link.htm now covers leap smearing, which is popular in clouds. 1993 1994 1995 Release 2016j - 2016-11-22 23:17:13 -0800 1996 1997 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 1998 1999 Changes to future timestamps 2000 2001 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 2002 This hives off a new zone Europe/Saratov from Europe/Volgograd. 2003 (Thanks to Yuri Konotopov and Stepan Golosunov.) 2004 2005 Changes to past timestamps 2006 2007 The new zone Asia/Atyrau for Atyra Region, Kazakhstan, is like 2008 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 2009 1999, not fall 1994. (Thanks to Stepan Golosunov.) 2010 2011 Changes to past time zone abbreviations 2012 2013 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 2014 summer time before 1948. The old use of "EET" was a typo. 2015 2016 Changes to code 2017 2018 zic no longer mishandles file systems that lack hard links, fixing 2019 bugs introduced in 2016g. (Problems reported by Tom Lane.) 2020 Also, when the destination already contains symbolic links, zic 2021 should now work better on systems where the 'link' system call 2022 does not follow symbolic links. 2023 2024 Changes to documentation and commentary 2025 2026 tz-link.htm now documents the relationship between release version 2027 numbers and development-repository commit tags. (Suggested by 2028 Paul Koning.) 2029 2030 The 'Theory' file now documents UT. 2031 2032 iso3166.tab now accents "Curaao", and commentary now mentions 2033 the names "Cabo Verde" and "Czechia". (Thanks to Ji Boh.) 2034 2035 2036 Release 2016i - 2016-11-01 23:19:52 -0700 2037 2038 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 2039 reintroduces DST on 2016-11-06. 2040 2041 Changes to future timestamps 2042 2043 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 2044 2017-01-15 at 03:00. Assume future observances in Tonga will be 2045 from the first Sunday in November through the third Sunday in 2046 January, like Fiji. (Thanks to Pulu Anau.) Switch to numeric 2047 time zone abbreviations for this zone. 2048 2049 Changes to past and future timestamps 2050 2051 Northern Cyprus is now +03 year round, causing a split in Cyprus 2052 time zones starting 2016-10-30 at 04:00. This creates a zone 2053 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 2054 2055 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 2056 (Thanks to Steffen Thorsen.) 2057 2058 Changes to past timestamps 2059 2060 Several corrections were made for pre-1975 timestamps in Italy. 2061 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 2062 Europe/Vatican. 2063 2064 First, the 1893-11-01 00:00 transition in Italy used the new UT 2065 offset (+01), not the old (+00:49:56). (Thanks to Michael 2066 Deckers.) 2067 2068 Second, rules for daylight saving in Italy were changed to agree 2069 with Italy's National Institute of Metrological Research (INRiM) 2070 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 2071 Inglis, and Michael Deckers): 2072 2073 The 1916-06-03 transition was at 24:00, not 00:00. 2074 2075 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 2076 00:00, not 01:00. 2077 2078 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 2079 01:00. 2080 2081 The 1944-09-17 transition was at 03:00, not 01:00. This 2082 particular change is taken from Italian law as INRiM's table, 2083 (which says 02:00) appears to have a typo here. Also, keep the 2084 1944-04-03 transition for Europe/Rome, as Rome was controlled by 2085 Germany then. 2086 2087 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 2088 not 00:00. 2089 2090 Changes to code 2091 2092 The code should now be buildable on AmigaOS merely by setting the 2093 appropriate Makefile variables. (From a patch by Carsten Larsen.) 2094 2095 2096 Release 2016h - 2016-10-19 23:17:57 -0700 2097 2098 Changes to future timestamps 2099 2100 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 2101 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 2102 future fall transitions will be on the last Saturday of October 2103 at 01:00, which is consistent with predicted spring transitions 2104 on the last Saturday of March. (Thanks to Tim Parenti.) 2105 2106 Changes to past timestamps 2107 2108 In Turkey, transitions in 1986-1990 were at 01:00 standard time 2109 not at 02:00, and the spring 1994 transition was on March 20, not 2110 March 27. (Thanks to Kvan Yazan.) 2111 2112 Changes to past and future time zone abbreviations 2113 2114 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 2115 instead of alphabetic ones like "IST" and "LKT". Various 2116 English-language sources use "IST", "LKT" and "SLST", with no 2117 working consensus. (Usage of "SLST" mentioned by Sadika 2118 Sumanapala.) 2119 2120 Changes to code 2121 2122 zic no longer mishandles relativizing file names when creating 2123 symbolic links like /etc/localtime, when these symbolic links 2124 are outside the usual directory hierarchy. This fixes a bug 2125 introduced in 2016g. (Problem reported by Andreas Stieger.) 2126 2127 Changes to build procedure 2128 2129 New rules 'traditional_tarballs' and 'traditional_signatures' for 2130 building just the traditional-format distribution. (Requested by 2131 Deborah Goldsmith.) 2132 2133 The file 'version' is now put into the tzdata tarball too. 2134 (Requested by Howard Hinnant.) 2135 2136 Changes to documentation and commentary 2137 2138 The 'Theory' file now has a section on interface stability. 2139 (Requested by Paul Koning.) It also mentions features like 2140 tm_zone and localtime_rz that have long been supported by the 2141 reference code. 2142 2143 tz-link.htm has improved coverage of time zone boundaries suitable 2144 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 2145 Johnson.) 2146 2147 The US commentary now mentions Allen and the "day of two noons". 2148 2149 The Fiji commentary mentions the government's 2016-10-03 press 2150 release. (Thanks to Raymond Kumar.) 2151 2152 2153 Release 2016g - 2016-09-13 08:56:38 -0700 2154 2155 Changes to future timestamps 2156 2157 Turkey switched from EET/EEST (+02/+03) to permanent +03, 2158 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 2159 than an invented abbreviation for the new time. 2160 2161 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 2162 (Thanks to Tim Parenti.) 2163 2164 Changes to past timestamps 2165 2166 For America/Los_Angeles, spring-forward transition times have been 2167 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 2168 1950-1966. 2169 2170 For zones using Soviet time on 1919-07-01, transitions to UT-based 2171 time were at 00:00 UT, not at 02:00 local time. The affected 2172 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 2173 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 2174 2175 Changes to past and future time zone abbreviations 2176 2177 The Factory zone now uses the time zone abbreviation -00 instead 2178 of a long English-language string, as -00 is now the normal way to 2179 represent an undefined time zone. 2180 2181 Several zones in Antarctica and the former Soviet Union, along 2182 with zones intended for ships at sea that cannot use POSIX TZ 2183 strings, now use numeric time zone abbreviations instead of 2184 invented or obsolete alphanumeric abbreviations. The affected 2185 zones are Antarctica/Casey, Antarctica/Davis, 2186 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 2187 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 2188 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 2189 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 2190 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 2191 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 2192 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 2193 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 2194 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 2195 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 2196 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 2197 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 2198 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 2199 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 2200 was replaced by +05, whereas MSK and MSD were kept as they are not 2201 our invention and are widely used. 2202 2203 Changes to zone names 2204 2205 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 2206 (Thanks to David Massoud.) 2207 2208 Changes to code 2209 2210 zic no longer generates binary files containing POSIX TZ-like 2211 strings that disagree with the local time type after the last 2212 explicit transition in the data. This fixes a bug with 2213 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 2214 on the reference platform. (Thanks to Alexander Belopolsky for 2215 reporting the bug and suggesting a way forward.) 2216 2217 If the installed localtime and/or posixrules files are symbolic 2218 links, zic now keeps them symbolic links when updating them, for 2219 compatibility with platforms like OpenSUSE where other programs 2220 configure these files as symlinks. 2221 2222 zic now avoids hard linking to symbolic links, avoids some 2223 unnecessary mkdir and stat system calls, and uses shorter file 2224 names internally. 2225 2226 zdump has a new -i option to generate transitions in a 2227 more-compact but still human-readable format. This option is 2228 experimental, and the output format may change in future versions. 2229 (Thanks to Jon Skeet for suggesting that an option was needed, 2230 and thanks to Tim Parenti and Chris Rovick for further comments.) 2231 2232 Changes to build procedure 2233 2234 An experimental distribution format is available, in addition 2235 to the traditional format which will continue to be distributed. 2236 The new format is a tarball tzdb-VERSION.tar.lz with signature 2237 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 2238 tzdb-VERSION containing the code and data of the traditional 2239 two-tarball format, along with extra data that may be useful. 2240 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 2241 for comments about the experimental format.) 2242 2243 The release version number is now more accurate in the usual case 2244 where releases are built from a Git repository. For example, if 2245 23 commits and some working-file changes have been made since 2246 release 2016g, the version number is now something like 2247 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 2248 Tagged releases use the same version number format as before, 2249 e.g., '2016g'. To support the more-accurate version number, its 2250 specification has moved from a line in the Makefile to a new 2251 source file 'version'. 2252 2253 The experimental distribution contains a file to2050.tzs that 2254 contains what should be the output of 'zdump -i -c 2050' on 2255 primary zones. If this file is available, 'make check' now checks 2256 that zdump generates this output. 2257 2258 'make check_web' now works on Fedora-like distributions. 2259 2260 Changes to documentation and commentary 2261 2262 tzfile.5 now documents the new restriction on POSIX TZ-like 2263 strings that is now implemented by zic. 2264 2265 Comments now cite URLs for some 1917-1921 Russian DST decrees. 2266 (Thanks to Alexander Belopolsky.) 2267 2268 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 2269 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 2270 description of Java 8 has been brought up to date (thanks to 2271 Stephen Colebourne). Its description of local time on Mars has 2272 been updated to match current practice, and URLs have been updated 2273 and some obsolete ones removed. 2274 2275 2276 Release 2016f - 2016-07-05 16:26:51 +0200 2277 2278 Changes affecting future timestamps 2279 2280 The Egyptian government changed its mind on short notice, and 2281 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 2282 (Thanks to Mina Samuel.) 2283 2284 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 2285 (Thanks to Stepan Golosunov.) 2286 2287 Changes to past and future timestamps 2288 2289 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 2290 abbreviations instead of invented ones. 2291 2292 Changes affecting past timestamps 2293 2294 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 2295 (Thanks to Stepan Golosunov.) 2296 2297 2298 Release 2016e - 2016-06-14 08:46:16 -0700 2299 2300 Changes affecting future timestamps 2301 2302 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 2303 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 2304 For future years, guess April's last Thursday to October's last 2305 Thursday except for Ramadan. 2306 2307 Changes affecting past timestamps 2308 2309 Locations while uninhabited now use '-00', not 'zzz', as a 2310 placeholder time zone abbreviation. This is inspired by Internet 2311 RFC 3339 and is more consistent with numeric time zone 2312 abbreviations already used elsewhere. The change affects several 2313 arctic and antarctic locations, e.g., America/Cambridge_Bay before 2314 1920 and Antarctica/Troll before 2005. 2315 2316 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 2317 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 2318 2319 Changes to code 2320 2321 zic now outputs a dummy transition at time 2**31 - 1 in zones 2322 whose POSIX-style TZ strings contain a '<'. This mostly works 2323 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 2324 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 2325 2326 Changes affecting documentation and commentary 2327 2328 tz-link.htm says why governments should give plenty of notice for 2329 time zone or DST changes, and refers to Matt Johnson's blog post. 2330 2331 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 2332 2333 2334 Release 2016d - 2016-04-17 22:50:29 -0700 2335 2336 Changes affecting future timestamps 2337 2338 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 2339 (Thanks to Alexander Krivenyshev for the heads-up.) 2340 2341 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 2342 (Thanks to Alexander Krivenyshev and Matt Johnson.) 2343 2344 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 2345 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 2346 at 02:00. (Thanks to Stepan Golosunov.) 2347 2348 Changes affecting past timestamps 2349 2350 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 2351 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 2352 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 2353 the same change. (Thanks to Stepan Golosunov.) 2354 2355 Russia and nearby locations had daylight-saving transitions on 2356 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 2357 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 2358 Golosunov.) 2359 2360 Many corrections to historical time in Kazakhstan from 1991 2361 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 2362 invented time zone abbreviations with numeric abbreviations. 2363 2364 Changes to commentary 2365 2366 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 2367 2368 2369 Release 2016c - 2016-03-23 00:51:27 -0700 2370 2371 Changes affecting future timestamps 2372 2373 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 2374 2375 Chile reverts from permanent to seasonal DST. (Thanks to Juan 2376 Correa for the heads-up, and to Tim Parenti for corrections.) 2377 Guess that future transitions are August's and May's second 2378 Saturdays at 24:00 mainland time. Also, call the period from 2379 2014-09-07 through 2016-05-14 daylight saving time instead of 2380 standard time, as that seems more appropriate now. 2381 2382 Changes affecting past timestamps 2383 2384 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 2385 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 2386 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 2387 (Thanks to Stepan Golosunov.) 2388 2389 Changes to commentary 2390 2391 Several updates and URLs for historical and proposed Russian changes. 2392 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 2393 2394 2395 Release 2016b - 2016-03-12 17:30:14 -0800 2396 2397 Compatibility note 2398 2399 Starting with release 2016b, some data entries cause zic implementations 2400 derived from tz releases 2005j through 2015e to issue warnings like 2401 "time zone abbreviation differs from POSIX standard (+03)". 2402 These warnings should not otherwise affect zic's output and can safely be 2403 ignored on today's platforms, as the warnings refer to a restriction in 2404 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 2405 warnings is to upgrade to zic derived from tz releases 2015f and later. 2406 2407 Changes affecting future timestamps 2408 2409 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 2410 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 2411 2016-03-27 at 02:00 local time. They need distinct zones since their 2412 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 2413 Altai Republic, Russia, which will switch from +06 to +07 on the same date 2414 and local time. The Astrakhan change is already official; the others have 2415 passed the first reading in the State Duma and are extremely likely. 2416 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 2417 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 2418 and Stepan Golosunov for followup.) 2419 2420 As a trial of a new system that needs less information to be made up, 2421 the new zones use numeric time zone abbreviations like "+04" 2422 instead of invented abbreviations like "ASTT". 2423 2424 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 2425 Steffen Thorsen.) 2426 2427 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 2428 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 2429 Saturday at 01:00, not March's last Friday at 24:00. 2430 2431 Changes affecting past timestamps 2432 2433 Europe/Chisinau observed DST during 1990, and switched from +04 to 2434 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 2435 (Thanks to Stepan Golosunov.) 2436 2437 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 2438 KUYT/KUYST. (Thanks to Stepan Golosunov.) 2439 2440 Changes to code 2441 2442 tzselect's diagnostics and checking, and checktab.awk's checking, 2443 have been improved. (Thanks to J William Piggott.) 2444 2445 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 2446 2447 tzselect now tests Julian-date TZ settings more accurately. 2448 (Thanks to J William Piggott.) 2449 2450 Changes to commentary 2451 2452 Comments in zone tables have been improved. (Thanks to J William Piggott.) 2453 2454 tzselect again limits its menu comments so that menus fit on a 2455 2480 alphanumeric display. 2456 2457 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 2458 2459 In the Theory file, the description of possible time zone abbreviations in 2460 tzdata has been cleaned up, as the old description was unclear and 2461 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 2462 2463 2464 Release 2016a - 2016-01-26 23:28:02 -0800 2465 2466 Changes affecting future timestamps 2467 2468 America/Cayman will not observe daylight saving this year after all. 2469 Revert our guess that it would. (Thanks to Matt Johnson.) 2470 2471 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 2472 (Thanks to Alexander Krivenyshev.) 2473 2474 Asia/Tehran now has DST predictions for the year 2038 and later, 2475 to be March 21 00:00 to September 21 00:00. This is likely better 2476 than predicting no DST, albeit off by a day every now and then. 2477 2478 Changes affecting past and future timestamps 2479 2480 America/Metlakatla switched from PST all year to AKST/AKDT on 2481 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 2482 2483 America/Santa_Isabel has been removed, and replaced with a 2484 backward compatibility link to America/Tijuana. Its contents were 2485 apparently based on a misreading of Mexican legislation. 2486 2487 Changes affecting past timestamps 2488 2489 Asia/Karachi's two transition times in 2002 were off by a minute. 2490 (Thanks to Matt Johnson.) 2491 2492 Changes affecting build procedure 2493 2494 An installer can now combine leap seconds with use of the backzone file, 2495 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 2496 The old 'make posix_packrat' rule is now marked as obsolescent. 2497 (Thanks to Ian Abbott for an initial implementation.) 2498 2499 Changes affecting documentation and commentary 2500 2501 A new file LICENSE makes it easier to see that the code and data 2502 are mostly public-domain. (Thanks to James Knight.) The three 2503 non-public-domain files now use the current (3-clause) BSD license 2504 instead of older versions of that license. 2505 2506 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 2507 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 2508 on editing tz source files (with a mention of Sublime zoneinfo, 2509 thanks to Gilmore Davidson). 2510 2511 The Theory and asia files now mention the 2015 book "The Global 2512 Transformation of Time, 1870-1950", and cite a couple of reviews. 2513 2514 The America/Chicago entry now documents the informal use of US 2515 central time in Fort Pierre, South Dakota. (Thanks to Rick 2516 McDermid, Matt Johnson, and Steve Jones.) 2517 2518 2519 Release 2015g - 2015-10-01 00:39:51 -0700 2520 2521 Changes affecting future timestamps 2522 2523 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 2524 (Thanks to Fatih.) 2525 2526 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 2527 (Thanks to Alexander Krivenyshev.) 2528 2529 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 2530 (Thanks to Ken Rylander.) 2531 2532 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 2533 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 2534 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 2535 2536 Changes affecting past timestamps 2537 2538 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 2539 2540 Changes affecting code 2541 2542 localtime no longer mishandles America/Anchorage after 2037. 2543 (Thanks to Bradley White for reporting the bug.) 2544 2545 On hosts with signed 32-bit time_t, localtime no longer mishandles 2546 Pacific/Fiji after 2038-01-16 14:00 UTC. 2547 2548 The localtime module allows the variables 'timezone', 'daylight', 2549 and 'altzone' to be in common storage shared with other modules, 2550 and declares them in case the system <time.h> does not. 2551 (Problems reported by Kees Dekker.) 2552 2553 On platforms with tm_zone, strftime.c now assumes it is not NULL. 2554 This simplifies the code and is consistent with zdump.c. 2555 (Problem reported by Christos Zoulas.) 2556 2557 Changes affecting documentation 2558 2559 The tzfile man page now documents that transition times denote the 2560 starts (not the ends) of the corresponding time periods. 2561 (Ambiguity reported by Bill Seymour.) 2562 2563 2564 Release 2015f - 2015-08-10 18:06:56 -0700 2565 2566 Changes affecting future timestamps 2567 2568 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 2569 The abbreviation remains "KST". (Thanks to Robert Elz.) 2570 2571 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 2572 and Pablo Camargo.) 2573 2574 Changes affecting past and future timestamps 2575 2576 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 2577 (Thanks to Roman Tudos.) 2578 2579 Changes affecting data format and code 2580 2581 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 2582 field of a Rule line should now be '-'; the old values 'even', 2583 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 2584 Although the implementation has not changed, these features do not 2585 work in the default installation, they are not used in the data, 2586 and they are now considered obsolescent. 2587 2588 zic now checks that two rules don't take effect at the same time. 2589 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 2590 simultaneity are now documented. 2591 2592 The two characters '%z' in a zone format now stand for the UT 2593 offset, e.g., '-07' for seven hours behind UT and '+0530' for 2594 five hours and thirty minutes ahead. This better supports time 2595 zone abbreviations conforming to POSIX.1-2001 and later. 2596 2597 Changes affecting installed data files 2598 2599 Comments for America/Halifax and America/Glace_Bay have been improved. 2600 (Thanks to Brian Inglis.) 2601 2602 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 2603 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 2604 installed data files for Europe/Simferopol and Europe/Tallinn. 2605 It does not affect timestamps. (Thanks to Howard Hinnant.) 2606 2607 Changes affecting code 2608 2609 zdump and zic no longer warn about valid time zone abbreviations 2610 like '-05'. 2611 2612 Some Visual Studio 2013 warnings have been suppressed. 2613 (Thanks to Kees Dekker.) 2614 2615 'date' no longer sets the time of day and its -a, -d, -n and -t 2616 options have been removed. Long obsolescent, the implementation 2617 of these features had porting problems. Builders no longer need 2618 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 2619 (Thanks to Kees Dekker for pointing out the problem.) 2620 2621 Changes affecting documentation 2622 2623 The Theory file mentions naming issues earlier, as these seem to be 2624 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 2625 2626 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 2627 2628 Mention that Herbert Samuel introduced the term "Summer Time". 2629 2630 2631 Release 2015e - 2015-06-13 10:56:02 -0700 2632 2633 Changes affecting future timestamps 2634 2635 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 2636 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 2637 2638 Assume Cayman Islands will observe DST starting next year, using US rules. 2639 Although it isn't guaranteed, it is the most likely. 2640 2641 Changes affecting data format 2642 2643 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 2644 spell the names of land Islands, Cte d'Ivoire, and Runion. 2645 2646 Changes affecting code 2647 2648 When displaying data, tzselect converts it to the current locale's 2649 encoding if the iconv command works. (Problem reported by random832.) 2650 2651 tzselect no longer mishandles Dominica, fixing a bug introduced 2652 in Release 2014f. (Problem reported by Owen Leibman.) 2653 2654 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 2655 This fixes a bug introduced in Release 2014f. 2656 (Problem reported by Leonardo Chiquitto.) 2657 2658 2659 Release 2015d - 2015-04-24 08:09:46 -0700 2660 2661 Changes affecting future timestamps 2662 2663 Egypt will not observe DST in 2015 and will consider canceling it 2664 permanently. For now, assume no DST indefinitely. 2665 (Thanks to Ahmed Nazmy and Tim Parenti.) 2666 2667 Changes affecting past timestamps 2668 2669 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 2670 1966-07-01. Also, Yukon's time zone history is documented better. 2671 (Thanks to Brian Inglis and Dennis Ferguson.) 2672 2673 Change affecting past and future time zone abbreviations 2674 2675 The abbreviations for Hawaii-Aleutian standard and daylight times 2676 have been changed from HAST/HADT to HST/HDT, as per US Government 2677 Printing Office style. This affects only America/Adak since 1983, 2678 as America/Honolulu was already using the new style. 2679 2680 Changes affecting code 2681 2682 zic has some minor performance improvements. 2683 2684 2685 Release 2015c - 2015-04-11 08:55:55 -0700 2686 2687 Changes affecting future timestamps 2688 2689 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 2690 not 00:00 on April's last Friday. 2015's transition will therefore be on 2691 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 2692 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 2693 2694 Changes affecting past timestamps 2695 2696 The following changes affect some pre-1991 Chile-related timestamps 2697 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 2698 2699 The 1910 transition was January 10, not January 1. 2700 2701 The 1918 transition was September 10, not September 1. 2702 2703 The UT -04 time observed from 1932 to 1942 is now considered to 2704 be standard time, not year-round DST. 2705 2706 Santiago observed DST (UT -03) from 1946-07-15 through 2707 1946-08-31, then reverted to standard time, then switched to -05 2708 on 1947-04-01. 2709 2710 Assume transitions before 1968 were at 00:00, since we have no data 2711 saying otherwise. 2712 2713 The spring 1988 transition was 1988-10-09, not 1988-10-02. 2714 The fall 1990 transition was 1990-03-11, not 1990-03-18. 2715 2716 Assume no UT offset change for Pacific/Easter on 1890-01-01, 2717 and omit all transitions on Pacific/Easter from 1942 through 1946 2718 since we have no data suggesting that they existed. 2719 2720 One more zone has been turned into a link, as it differed 2721 from an existing zone only for older timestamps. As usual, 2722 this change affects UT offsets in pre-1970 timestamps only. 2723 The zone's old contents have been moved to the 'backzone' file. 2724 The affected zone is America/Montreal. 2725 2726 Changes affecting commentary 2727 2728 Mention the TZUpdater tool. 2729 2730 Mention "The Time Now". (Thanks to Brandon Ramsey.) 2731 2732 2733 Release 2015b - 2015-03-19 23:28:11 -0700 2734 2735 Changes affecting future timestamps 2736 2737 Mongolia will start observing DST again this year, from the last 2738 Saturday in March at 02:00 to the last Saturday in September at 00:00. 2739 (Thanks to Ganbold Tsagaankhuu.) 2740 2741 Palestine will start DST on March 28, not March 27. Also, 2742 correct the fall 2014 transition from September 26 to October 24. 2743 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 2744 2745 Changes affecting past timestamps 2746 2747 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 2748 regression. (Thanks to Stuart Bishop for reporting the problem.) 2749 2750 Some more zones have been turned into links, when they differed 2751 from existing zones only for older timestamps. As usual, 2752 these changes affect UT offsets in pre-1970 timestamps only. 2753 Their old contents have been moved to the 'backzone' file. 2754 The affected zones are: America/Antigua, America/Cayman, 2755 Pacific/Midway, and Pacific/Saipan. 2756 2757 Changes affecting time zone abbreviations 2758 2759 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 2760 (Thanks to Hank W.) 2761 2762 Changes affecting code 2763 2764 Fix integer overflow bug in reference 'mktime' implementation. 2765 (Problem reported by Jrg Richter.) 2766 2767 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 2768 to be used in the same executable as standard-library time_t functions. 2769 (Problems reported by Bradley White.) 2770 2771 Changes affecting commentary 2772 2773 Cite the recent Mexican decree changing Quintana Roo's time zone. 2774 (Thanks to Carlos Ral Perasso.) 2775 2776 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 2777 2778 Update info about Mars time. 2779 2780 2781 Release 2015a - 2015-01-29 22:35:20 -0800 2782 2783 Changes affecting future timestamps 2784 2785 The Mexican state of Quintana Roo, represented by America/Cancun, 2786 will shift from Central Time with DST to Eastern Time without DST 2787 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 2788 2789 Chile will not change clocks in April or thereafter; its new standard time 2790 will be its old daylight saving time. This affects America/Santiago, 2791 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 2792 2793 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 2794 (Thanks to Tim Parenti.) 2795 2796 Changes affecting past timestamps 2797 2798 Iceland observed DST in 1919 and 1921, and its 1939 fallback 2799 transition was Oct. 29, not Nov. 29. Remove incorrect data from 2800 Shanks about time in Iceland between 1837 and 1908. 2801 2802 Some more zones have been turned into links, when they differed 2803 from existing zones only for older timestamps. As usual, 2804 these changes affect UT offsets in pre-1970 timestamps only. 2805 Their old contents have been moved to the 'backzone' file. 2806 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 2807 and Asia/Muscat. 2808 2809 Changes affecting code 2810 2811 tzalloc now scrubs time zone abbreviations compatibly with the way 2812 that tzset always has, by replacing invalid bytes with '_' and by 2813 shortening too-long abbreviations. 2814 2815 tzselect ports to POSIX awk implementations, no longer mishandles 2816 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 2817 settings to the user. (Thanks to Stefan Kuhn.) 2818 2819 Changes affecting build procedure 2820 2821 'make check' now checks for links to links in the data. 2822 One such link (for Africa/Asmera) has been fixed. 2823 (Thanks to Stephen Colebourne for pointing out the problem.) 2824 2825 Changes affecting commentary 2826 2827 The leapseconds file commentary now mentions the expiration date. 2828 (Problem reported by Martin Burnicki.) 2829 2830 Update Mexican Library of Congress URL. 2831 2832 2833 Release 2014j - 2014-11-10 17:37:11 -0800 2834 2835 Changes affecting current and future timestamps 2836 2837 Turks & Caicos' switch from US eastern time to UT -04 year-round 2838 did not occur on 2014-11-02 at 02:00. It's currently scheduled 2839 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 2840 2841 Changes affecting past timestamps 2842 2843 Many pre-1989 timestamps have been corrected for Asia/Seoul and 2844 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 2845 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 2846 longer guess that Pyongyang mimicked Seoul time after World War II, 2847 as this is politically implausible. 2848 2849 Some more zones have been turned into links, when they differed 2850 from existing zones only for older timestamps. As usual, 2851 these changes affect UT offsets in pre-1970 timestamps only. 2852 Their old contents have been moved to the 'backzone' file. 2853 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 2854 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 2855 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 2856 Indian/Mayotte. 2857 2858 Changes affecting commentary 2859 2860 The commentary is less enthusiastic about Shanks as a source, 2861 and is more careful to distinguish UT from UTC. 2862 2863 2864 Release 2014i - 2014-10-21 22:04:57 -0700 2865 2866 Changes affecting future timestamps 2867 2868 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 2869 (Thanks to Ken Rylander for the heads-up.) Guess that future 2870 years will use a similar pattern. 2871 2872 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 2873 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 2874 (Thanks to Kiley Walbom for the heads-up.) 2875 2876 Changes affecting time zone abbreviations 2877 2878 Since Belarus is not changing its clocks even though Moscow is, 2879 the time zone abbreviation in Europe/Minsk is changing from FET 2880 to its more-traditional value MSK on 2014-10-26 at 01:00. 2881 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 2882 2883 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 2884 Indochina, to distinguish it better from ICT (+07). 2885 2886 Changes affecting past timestamps 2887 2888 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 2889 (thanks to Trn Ngc Qun for an indirect pointer to Trn Tin Bnh's 2890 authoritative book). Asia/Ho_Chi_Minh has been added to 2891 zone1970.tab, to give tzselect users in Vietnam two choices, 2892 since north and south Vietnam disagreed after our 1970 cutoff. 2893 2894 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 2895 they differed from existing zones only for older timestamps. As 2896 usual, these changes affect pre-1970 timestamps only. Their old 2897 contents have been moved to the 'backzone' file. 2898 2899 Changes affecting code 2900 2901 The time-related library functions now set errno on failure, and 2902 some crashes in the new tzalloc-related library functions have 2903 been fixed. (Thanks to Christos Zoulas for reporting most of 2904 these problems and for suggesting fixes.) 2905 2906 If USG_COMPAT is defined and the requested timestamp is standard time, 2907 the tz library's localtime and mktime functions now set the extern 2908 variable timezone to a value appropriate for that timestamp; and 2909 similarly for ALTZONE, daylight saving time, and the altzone variable. 2910 This change is a companion to the tzname change in 2014h, and is 2911 designed to make timezone and altzone more compatible with tzname. 2912 2913 The tz library's functions now set errno to EOVERFLOW if they fail 2914 because the result cannot be represented. ctime and ctime_r now 2915 return NULL and set errno when a timestamp is out of range, rather 2916 than having undefined behavior. 2917 2918 Some bugs associated with the new 2014g functions have been fixed. 2919 This includes a bug that largely incapacitated the new functions 2920 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 2921 It also includes some uses of uninitialized variables after tzalloc. 2922 The new code uses the standard type 'ssize_t', which the Makefile 2923 now gives porting advice about. 2924 2925 Changes affecting commentary 2926 2927 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 2928 2929 2930 Release 2014h - 2014-09-25 18:59:03 -0700 2931 2932 Changes affecting past timestamps 2933 2934 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 2935 2936 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 2937 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 2938 2939 Some more zones have been turned into links, when they differed 2940 from existing zones only for older timestamps. As usual, 2941 these changes affect UT offsets in pre-1970 timestamps only. 2942 Their old contents have been moved to the 'backzone' file. 2943 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 2944 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 2945 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 2946 2947 Changes affecting code 2948 2949 zdump -V and -v now output gmtoff= values on all platforms, 2950 not merely on platforms defining TM_GMTOFF. 2951 2952 The tz library's localtime and mktime functions now set tzname to a value 2953 appropriate for the requested timestamp, and zdump now uses this 2954 on platforms not defining TM_ZONE, fixing a 2014g regression. 2955 (Thanks to Tim Parenti for reporting the problem.) 2956 2957 The tz library no longer sets tzname if localtime or mktime fails. 2958 2959 zdump -c no longer mishandles transitions near year boundaries. 2960 (Thanks to Tim Parenti for reporting the problem.) 2961 2962 An access to uninitialized data has been fixed. 2963 (Thanks to Jrg Richter for reporting the problem.) 2964 2965 When THREAD_SAFE is defined, the code ports to the C11 memory model. 2966 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 2967 and two threads race to initialize data used by gmtime-like functions. 2968 (Thanks to Andy Heninger for reporting the problems.) 2969 2970 Changes affecting build procedure 2971 2972 'make check' now checks better for properly-sorted data. 2973 2974 Changes affecting documentation and commentary 2975 2976 zdump's gmtoff=N output is now documented, and its isdst=D output 2977 is now documented to possibly output D values other than 0 or 1. 2978 2979 zdump -c's treatment of years is now documented to use the 2980 Gregorian calendar and Universal Time without leap seconds, 2981 and its behavior at cutoff boundaries is now documented better. 2982 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 2983 2984 Programs are now documented to use the proleptic Gregorian calendar. 2985 (Thanks to Alan Barrett for the suggestion.) 2986 2987 Fractional-second GMT offsets have been documented for civil time 2988 in 19th-century Chennai, Jakarta, and New York. 2989 2990 2991 Release 2014g - 2014-08-28 12:31:23 -0700 2992 2993 Changes affecting future timestamps 2994 2995 Turks & Caicos is switching from US eastern time to UT -04 2996 year-round, modeled as a switch on 2014-11-02 at 02:00. 2997 [As noted in 2014j, this switch was later delayed.] 2998 2999 Changes affecting past timestamps 3000 3001 Time in Russia or the USSR before 1926 or so has been corrected by 3002 a few seconds in the following zones: Asia/Irkutsk, 3003 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 3004 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 3005 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 3006 Vladimir Karpinsky.) 3007 3008 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 3009 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 3010 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 3011 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 3012 (Thanks to Stephen Colebourne for pointing to the decree.) 3013 3014 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 3015 3016 A new file 'backzone' contains data which may appeal to 3017 connoisseurs of old timestamps, although it is out of scope for 3018 the tz database, is often poorly sourced, and contains some data 3019 that is known to be incorrect. The new file is not recommended 3020 for ordinary use and its entries are not installed by default. 3021 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 3022 Isle of Man entries.) 3023 3024 Some more zones have been turned into links, when they differed 3025 from existing zones only for older timestamps. As usual, 3026 these changes affect UT offsets in pre-1970 timestamps only. 3027 Their old contents have been moved to the 'backzone' file. 3028 The affected zones are: Africa/Bangui, Africa/Brazzaville, 3029 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 3030 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 3031 3032 Changes affecting code 3033 3034 Unless NETBSD_INSPIRED is defined to 0, the tz library now 3035 supplies functions for creating and using objects that represent 3036 timezones. The new functions are tzalloc, tzfree, localtime_rz, 3037 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 3038 time2posix_z. They are intended for performance: for example, 3039 localtime_rz (unlike localtime_r) is trivially thread-safe without 3040 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 3041 functions, and to Alan Barrett and Jonathan Lennox for helping to 3042 debug the change.) 3043 3044 zdump now builds with the tz library unless USE_LTZ is defined to 0, 3045 This lets zdump use tz features even if the system library lacks them. 3046 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 3047 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 3048 3049 zdump now uses localtime_rz if available, as it's significantly faster, 3050 and it can help zdump better diagnose invalid timezone names. 3051 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 3052 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 3053 not available, zdump now uses localtime_r and tzset if available, 3054 as this is a bit cleaner and faster than plain localtime. Compile 3055 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 3056 lacks these two functions. 3057 3058 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 3059 Although not needed for tz's own applications, which are single-threaded, 3060 this supports POSIX better if the tz library is used in multithreaded apps. 3061 3062 Some crashes have been fixed when zdump or the tz library is given 3063 invalid or outlandish input. 3064 3065 The tz library no longer mishandles leap seconds on platforms with 3066 unsigned time_t in timezones that lack ordinary transitions after 1970. 3067 3068 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 3069 already defined, to make it easier to configure on common platforms. 3070 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 3071 3072 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 3073 assumes that reading uninitialized memory yields garbage values 3074 but does not cause other problems such as traps. 3075 3076 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 3077 more likely to guess right for ambiguous timestamps near 3078 transitions where tm_isdst does not change. 3079 3080 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 3081 strftime_l for compatibility with recent versions of POSIX. 3082 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 3083 to 1 on recent POSIX versions, and to 0 otherwise. 3084 3085 tzselect -c now uses a hybrid distance measure that works better 3086 in Africa. (Thanks to Alan Barrett for noting the problem.) 3087 3088 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 3089 or when time_tz is defined. 3090 3091 When HAVE_UTMPX_H is set the 'date' command now builds on systems 3092 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 3093 the date it updates the wtmpx file if _PATH_WTMPX is defined. 3094 This affects GNU/Linux and similar systems. 3095 3096 For easier maintenance later, some C code has been simplified, 3097 some lint has been removed, and the code has been tweaked so that 3098 plain 'make' is more likely to work. 3099 3100 The C type 'bool' is now used for boolean values, instead of 'int'. 3101 3102 The long-obsolete LOCALE_HOME code has been removed. 3103 3104 The long-obsolete 'gtime' function has been removed. 3105 3106 Changes affecting build procedure 3107 3108 'zdump' no longer links in ialloc.o, as it's not needed. 3109 3110 'make check_time_t_alternatives' no longer assumes GNU diff. 3111 3112 Changes affecting distribution tarballs 3113 3114 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 3115 the tzdata tarball instead of the tzcode tarball, since they help 3116 maintain the data. The NEWS and Theory files are now also 3117 distributed in the tzdata tarball, as they're relevant for data. 3118 (Thanks to Alan Barrett for pointing this out.) Also, the 3119 leapseconds.awk file is no longer distributed in the tzcode 3120 tarball, since it belongs in the tzdata tarball (where 2014f 3121 inadvertently also distributed it). 3122 3123 Changes affecting documentation and commentary 3124 3125 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 3126 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 3127 for debugging it.) 3128 3129 The man pages have been updated to use function prototypes, 3130 to document thread-safe variants like localtime_r, and to document 3131 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 3132 mktime_z. 3133 3134 The fields in Link lines have been renamed to be more descriptive 3135 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 3136 and LINK-TO has become LINK-NAME. 3137 3138 tz-link.htm mentions the IETF's tzdist working group; Windows 3139 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 3140 3141 Some broken URLs have been fixed in the commentary. (Thanks to 3142 Lester Caine.) 3143 3144 Commentary about Philippines DST has been updated, and commentary 3145 on pre-1970 time in India has been added. 3146 3147 3148 Release 2014f - 2014-08-05 17:42:36 -0700 3149 3150 Changes affecting future timestamps 3151 3152 Russia will subtract an hour from most of its time zones on 2014-10-26 3153 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 3154 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 3155 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 3156 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 3157 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 3158 (Europe/Samara) are not changing their clocks. The changed zones are 3159 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 3160 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 3161 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 3162 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 3163 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 3164 but not its UTC offset. Two zones are added: Asia/Chita (split 3165 from Asia/Yakutsk, and also with two hours subtracted) and 3166 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 3167 subtracted). (Thanks to Tim Parenti for much of the above.) 3168 3169 Changes affecting time zone abbreviations 3170 3171 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 3172 and similarly for the other Australian zones. That is, for eastern 3173 standard and daylight saving time the abbreviations are AEST and AEDT 3174 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 3175 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 3176 This change does not affect UT offsets, only time zone abbreviations. 3177 (Thanks to Rich Tibbett and many others.) 3178 3179 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 3180 effective 2014-10-26 at 02:00 local time. 3181 3182 The time zone abbreviation for Xinjiang Time (observed in rmqi) 3183 has been changed from URUT to XJT. (Thanks to Luther Ma.) 3184 3185 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 3186 Similarly, prefer EET/EEST for eastern European time in Russia. 3187 3188 Change time zone abbreviations in (western) Samoa to use "ST" and 3189 "DT" suffixes, as this is more likely to match common practice. 3190 Prefix "W" to (western) Samoa time when its standard-time offset 3191 disagrees with that of American Samoa. 3192 3193 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 3194 3195 Time zone abbreviations have been updated for Japan's two time 3196 zones used 1896-1937. JWST now stands for Western Standard 3197 Time, and JCST for Central Standard Time (formerly this was CJT). 3198 These abbreviations are now used for time in Korea, Taiwan, 3199 and Sakhalin while controlled by Japan. 3200 3201 Changes affecting past timestamps 3202 3203 China's five zones have been simplified to two, since the post-1970 3204 differences in the other three seem to have been imaginary. The 3205 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 3206 removed; backwards-compatibility links still work, albeit with 3207 different behaviors for timestamps before May 1980. Asia/Urumqi's 3208 1980 transition to UT +08 has been removed, so that it is now at 3209 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 3210 Treindl sent helpful translations of two papers by Guo Qingsheng.) 3211 3212 Some zones have been turned into links, when they differed from existing 3213 zones only for older UT offsets where data entries were likely invented. 3214 These changes affect UT offsets in pre-1970 timestamps only. This is 3215 similar to the change in release 2013e, except this time for western 3216 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 3217 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 3218 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 3219 Atlantic/St_Helena. This also affects the backwards-compatibility 3220 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 3221 Tim Parenti, and David Patte for reporting problems in earlier 3222 versions of this change.) 3223 3224 Asia/Shanghai's pre-standard-time UT offset has been changed from 3225 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 3226 transition to standard time has been changed from 1928 to 1901. 3227 3228 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 3229 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 3230 In 1946 it observed DST from 05-15 through 09-30; in 1947 3231 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 3232 (Thanks to Yu-Cheng Chuang.) 3233 3234 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 3235 3236 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 3237 10-03 at 00:00. (Thanks to Konstantin Hyppnen.) 3238 3239 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 3240 period from 1911 to 1950. 3241 3242 Pacific/Chatham has been changed to New Zealand standard time plus 3243 45 minutes for the period before 1957, reflecting a 1956 remark in 3244 the New Zealand parliament. 3245 3246 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 3247 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 3248 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 3249 not 04-06 at 02:00; and there was no DST in 1920. 3250 3251 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 3252 3253 Time in Russia before 1927 or so has been corrected by a few seconds in 3254 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 3255 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 3256 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 3257 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 3258 3259 Changes affecting data format 3260 3261 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 3262 The new file's extended format allows multiple country codes per zone. 3263 The older file is still installed but is deprecated; its format is 3264 not changing and it will still be distributed for a while, but new 3265 applications should use the new file. 3266 3267 The new file format simplifies maintenance of obscure locations. 3268 To test this, it adds coverage for the Crozet Islands and the 3269 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 3270 3271 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 3272 It is still ASCII now, but commentary about the switch has been added. 3273 The new file 'zone1970.tab' already uses UTF-8. 3274 3275 Changes affecting code 3276 3277 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 3278 is defined. (Thanks to Elliott Hughes for reporting the problem.) 3279 3280 'zic' no longer mishandles input when ignoring case in locales that 3281 are not compatible with English, e.g., unibyte Turkish locales when 3282 compiled with HAVE_GETTEXT. 3283 3284 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 3285 they no longer use ASCII '-' as if it were a dash. 3286 3287 'zic' now rejects output file names that contain '.' or '..' components. 3288 (Thanks to Tim Parenti for reporting the problem.) 3289 3290 'zic -v' now warns about output file names that do not follow 3291 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 3292 David Olson for starting the ball rolling on this.) 3293 3294 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 3295 3296 Changes affecting build procedure 3297 3298 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 3299 (Thanks to John Cochran.) 3300 3301 Changes affecting documentation and commentary 3302 3303 The 'Theory' file documents legacy names, the longstanding 3304 exceptions to the POSIX-inspired file name rules. 3305 3306 The 'zic' documentation clarifies the role of time types when 3307 interpreting dates. (Thanks to Arthur David Olson.) 3308 3309 Documentation and commentary now prefer UTF-8 to US-ASCII, 3310 allowing the use of proper accents in foreign words and names. 3311 Code and data have not changed because of this. (Thanks to 3312 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 3313 this.) 3314 3315 Non-HTML documentation and commentary now use plain-text URLs instead of 3316 HTML insertions, and are more consistent about bracketing URLs when they 3317 are not already surrounded by white space. (Thanks to suggestions by 3318 Steffen Nurpmeso.) 3319 3320 There is new commentary about Xujiahui Observatory, the five time-zone 3321 project in China from 1918 to 1949, timekeeping in Japanese-occupied 3322 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 3323 warlord Jin Shuren in the data. 3324 3325 Commentary about the coverage of each Russian zone has been standardized. 3326 (Thanks to Tim Parenti.) 3327 3328 There is new commentary about contemporary timekeeping in Ethiopia. 3329 3330 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 3331 3332 There is new commentary about time in Poland in 1919. 3333 3334 Proper credit has been given to DST inventor George Vernon Hudson. 3335 3336 Commentary about time in Metlakatla, AK and Resolute, NU has been 3337 improved, with a new source for the former. 3338 3339 In zone.tab, Pacific/Easter no longer mentions Salas y Gmez, as it 3340 is uninhabited. 3341 3342 Commentary about permanent Antarctic bases has been updated. 3343 3344 Several typos have been corrected. (Thanks to Tim Parenti for 3345 contributing some of these fixes.) 3346 3347 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 3348 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 3349 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 3350 (Thanks to a heads-up from Dirkjan Ochtman.) 3351 3352 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 3353 have been removed. These obsolescent US Naval Observatory entries were no 3354 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 3355 3356 3357 Release 2014e - 2014-06-12 21:53:52 -0700 3358 3359 Changes affecting near-future timestamps 3360 3361 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 3362 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 3363 switch to standard time at 24:00 the last Thursday before Ramadan, and 3364 back to DST at 00:00 the first Friday after Ramadan. 3365 3366 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 3367 to Milamber Space Network.) Guess that from 2015 on Morocco will 3368 temporarily switch to standard time at 03:00 the last Saturday before 3369 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 3370 3371 Changes affecting past timestamps 3372 3373 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 3374 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 3375 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 3376 in 1991. (Thanks to Hank W. for reporting the problems.) 3377 3378 Changes affecting commentary 3379 3380 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 3381 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 3382 removes stale pointers to World Time Explorer and WORLDTIME. 3383 3384 3385 Release 2014d - 2014-05-27 21:34:40 -0700 3386 3387 Changes affecting code 3388 3389 zic no longer generates files containing timestamps before the Big Bang. 3390 This works around GNOME glib bug 878 3391 <https://gitlab.gnome.org/GNOME/glib/issues/878> 3392 (Thanks to Leonardo Chiquitto for reporting the bug, and to 3393 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 3394 3395 Changes affecting documentation 3396 3397 tz-link.htm now mentions GNOME. 3398 3399 3400 Release 2014c - 2014-05-13 07:44:13 -0700 3401 3402 Changes affecting near-future timestamps 3403 3404 Egypt observes DST starting 2014-05-15 at 24:00. 3405 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 3406 Details have not been announced, except that DST will not be observed 3407 during Ramadan. Guess that DST will stop during the same Ramadan dates as 3408 Morocco, and that Egypt's future spring and fall transitions will be the 3409 same as 2010 when it last observed DST, namely April's last Friday at 3410 00:00 to September's last Thursday at 23:00 standard time. Also, guess 3411 that Ramadan transitions will be at 00:00 standard time. 3412 3413 Changes affecting code 3414 3415 zic now generates transitions for minimum time values, eliminating guesswork 3416 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 3417 3418 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 3419 3420 Changes affecting commentary and documentation 3421 3422 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 3423 3424 3425 Release 2014b - 2014-03-24 21:28:50 -0700 3426 3427 Changes affecting near-future timestamps 3428 3429 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 3430 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 3431 3432 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 3433 Bengt-Inge Larsson.) This is currently an approximation; a better version 3434 will require the zic and localtime fixes mentioned below, and the plan is 3435 to wait for a while until at least the zic fixes propagate. 3436 3437 Changes affecting code 3438 3439 'zic' and 'localtime' no longer reject locations needing four transitions 3440 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 3441 Also, 'zic' avoids some unlikely failures due to integer overflow. 3442 3443 Changes affecting build procedure 3444 3445 'make check' now detects Rule lines defined but never used. 3446 The NZAQ rules, an instance of this problem, have been removed. 3447 3448 Changes affecting commentary and documentation 3449 3450 Fix Tuesday/Thursday typo in description of time in Israel. 3451 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 3452 3453 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 3454 to Donald MacQueen.) Instead, the Microsoft Windows Store app 3455 library supports them. 3456 3457 Add comments about Johnston Island time in the 1960s. 3458 (Thanks to Lyle McElhaney.) 3459 3460 Morocco's 2014 DST start will be as predicted. 3461 (Thanks to Sebastien Willemijns.) 3462 3463 3464 Release 2014a - 2014-03-07 23:30:29 -0800 3465 3466 Changes affecting near-future timestamps 3467 3468 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 3469 the heads-up, and to Tim Parenti for simplifying the update.) 3470 3471 Changes affecting past timestamps 3472 3473 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00. 3474 (Thanks to Steffen Thorsen.) 3475 3476 Ukraine switched from Moscow to Eastern European time on 1990-07-01 3477 (not 1992-01-01), and observed DST during the entire next winter. 3478 (Thanks to Vladimir in Moscow via Alois Treindl.) 3479 3480 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 3481 (Thanks to Avigdor Finkelstein.) 3482 3483 Changes affecting code 3484 3485 A uninitialized-storage bug in 'localtime' has been fixed. 3486 (Thanks to Logan Chien.) 3487 3488 Changes affecting the build procedure 3489 3490 The settings for 'make check_web' now default to Ubuntu 13.10. 3491 3492 Changes affecting commentary and documentation 3493 3494 The boundary of the US Pacific time zone is given more accurately. 3495 (Thanks to Alan Mintz.) 3496 3497 Chile's 2014 DST will be as predicted. (Thanks to Jos Miguel Garrido.) 3498 3499 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Ral Perasso.) 3500 3501 Better descriptions of countries with same time zone history as 3502 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 3503 3504 Several changes affect tz-link.htm, the main web page. 3505 3506 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 3507 David Braverman). 3508 3509 Mention xCal (Internet RFC 6321) and jCal. 3510 3511 Microsoft has some support for tz database names. 3512 3513 CLDR data formats include both XML and JSON. 3514 3515 Mention Maggiolo's map of solar vs standard time. 3516 (Thanks to Arthur David Olson.) 3517 3518 Mention TZ4Net. (Thanks to Matt Johnson.) 3519 3520 Mention the timezone-olson Haskell package. 3521 3522 Mention zeitverschiebung.net. (Thanks to Martin Jger.) 3523 3524 Remove moribund links to daylight-savings-time.info and to 3525 Simple Timer + Clocks. 3526 3527 Update two links. (Thanks to Oscar van Vlijmen.) 3528 3529 Fix some formatting glitches, e.g., remove random newlines from 3530 abbr elements' title attributes. 3531 3532 3533 Release 2013i - 2013-12-17 07:25:23 -0800 3534 3535 Changes affecting near-future timestamps: 3536 3537 Jordan switches back to standard time at 00:00 on December 20, 2013. 3538 The 2006-2011 transition schedule is planned to resume in 2014. 3539 (Thanks to Steffen Thorsen.) 3540 3541 Changes affecting past timestamps: 3542 3543 In 2004, Cuba began DST on March 28, not April 4. 3544 (Thanks to Steffen Thorsen.) 3545 3546 Changes affecting code 3547 3548 The compile-time flag NOSOLAR has been removed, as nowadays the 3549 benefit of slightly shrinking runtime table size is outweighed by the 3550 cost of disallowing potential future updates that exceed old limits. 3551 3552 Changes affecting documentation and commentary 3553 3554 The files solar87, solar88, and solar89 are no longer distributed. 3555 They were a negative experiment - that is, a demonstration that 3556 tz data can represent solar time only with some difficulty and error. 3557 Their presence in the distribution caused confusion, as Riyadh 3558 civil time was generally not solar time in those years. 3559 3560 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 3561 3562 3563 Release 2013h - 2013-10-25 15:32:32 -0700 3564 3565 Changes affecting current and future timestamps: 3566 3567 Libya has switched its UT offset back to +02 without DST, instead 3568 of +01 with DST. (Thanks to Even Scharning.) 3569 3570 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 3571 (Thanks to Gwillim Law.) 3572 3573 Changes affecting future timestamps: 3574 3575 Acre and (we guess) western Amazonas will switch from UT -04 to -05 3576 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 3577 (Thanks to Steffen Thorsen.) 3578 3579 Add entries for DST transitions in Morocco in the year 2038. 3580 This avoids some year-2038 glitches introduced in 2013g. 3581 (Thanks to Yoshito Umaoka for reporting the problem.) 3582 3583 Changes affecting API 3584 3585 The 'tzselect' command no longer requires the 'select' command, 3586 and should now work with /bin/sh on more platforms. It also works 3587 around a bug in BusyBox awk before version 1.21.0. (Thanks to 3588 Patrick 'P. J.' McDermott and Alan Barrett.) 3589 3590 Changes affecting code 3591 3592 Fix localtime overflow bugs with 32-bit unsigned time_t. 3593 3594 zdump no longer assumes sscanf returns maximal values on overflow. 3595 3596 Changes affecting the build procedure 3597 3598 The builder can specify which programs to use, if any, instead of 3599 'ar' and 'ranlib', and libtz.a is now built locally before being 3600 installed. (Thanks to Michael Forney.) 3601 3602 A dependency typo in the 'zdump' rule has been fixed. 3603 (Thanks to Andrew Paprocki.) 3604 3605 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 3606 work as specified by POSIX.2-1992 or later; this is portable nowadays. 3607 3608 'make clean' no longer removes 'leapseconds', since it's 3609 host-independent and is part of the distribution. 3610 3611 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 3612 3613 Changes affecting documentation and commentary 3614 3615 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 3616 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 3617 3618 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 3619 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 3620 longer maintained) and for old advisories. SOFA now does C. 3621 3622 Release 2013g - 2013-09-30 21:08:26 -0700 3623 3624 Changes affecting current and near-future timestamps 3625 3626 Morocco now observes DST from the last Sunday in March to the last 3627 Sunday in October, not April to September respectively. (Thanks 3628 to Steffen Thorsen.) 3629 3630 Changes affecting 'zic' 3631 3632 'zic' now runs on platforms that lack both hard links and symlinks. 3633 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 3634 Also, fix some bugs on platforms that lack hard links but have symlinks. 3635 3636 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 3637 to predict the far future, fixing a bug introduced in 2013e. 3638 3639 Changes affecting the build procedure 3640 3641 The 'leapseconds' file is again put into the tzdata tarball. 3642 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 3643 Matt Burgess and Ian Abbott.) The timestamps of these and other 3644 dependent files in tarballs are adjusted more consistently. 3645 3646 Changes affecting documentation and commentary 3647 3648 The README file is now part of the data tarball as well as the code. 3649 It now states that files are public domain unless otherwise specified. 3650 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 3651 Its details about the 1989 release moved to a place of honor near 3652 the end of NEWS. 3653 3654 3655 Release 2013f - 2013-09-24 23:37:36 -0700 3656 3657 Changes affecting near-future timestamps 3658 3659 Tocantins will very likely not observe DST starting this spring. 3660 (Thanks to Steffen Thorsen.) 3661 3662 Jordan will likely stay at UT +03 indefinitely, and will not fall 3663 back this fall. 3664 3665 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 3666 3667 Changes affecting API 3668 3669 The types of the global variables 'timezone' and 'altzone' (if present) 3670 have been changed back to 'long'. This is required for 'timezone' 3671 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 3672 These variables were originally 'long' in the tz code, but were 3673 mistakenly changed to 'time_t' in 1987; nobody reported the 3674 incompatibility until now. The difference matters on x32, where 3675 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 3676 3677 Changes affecting the build procedure 3678 3679 Avoid long strings in leapseconds.awk to work around a mawk bug. 3680 (Thanks to Cyril Baurand.) 3681 3682 Changes affecting documentation and commentary 3683 3684 New file 'NEWS' that contains release notes like this one. 3685 3686 Paraguay's law does not specify DST transition time; 00:00 is customary. 3687 (Thanks to Waldemar Villamayor-Venialbo.) 3688 3689 Minor capitalization fixes. 3690 3691 Changes affecting version-control only 3692 3693 The experimental GitHub repository now contains annotated and 3694 signed tags for recent releases, e.g., '2013e' for Release 2013e. 3695 Releases are tagged starting with 2012e; earlier releases were 3696 done differently, and tags would either not have a simple name or 3697 not exactly match what was released. 3698 3699 'make set-timestamps' is now simpler and a bit more portable. 3700 3701 3702 Release 2013e - 2013-09-19 23:50:04 -0700 3703 3704 Changes affecting near-future timestamps 3705 3706 This year Fiji will start DST on October 27, not October 20. 3707 (Thanks to David Wheeler for the heads-up.) For now, guess that 3708 Fiji will continue to spring forward the Sunday before the fourth 3709 Monday in October. 3710 3711 Changes affecting current and future time zone abbreviations 3712 3713 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 3714 time zone abbreviations since 1932. (Thanks to George Ziegler, 3715 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 3716 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 3717 Asia/Makassar, and Asia/Pontianak. 3718 3719 Use ART (UT -03, standard time), rather than WARST (also -03, but 3720 daylight saving time) for San Luis, Argentina since 2009. 3721 3722 Changes affecting Godthb timestamps after 2037 if version mismatch 3723 3724 Allow POSIX-like TZ strings where the transition time's hour can 3725 range from -167 through 167, instead of the POSIX-required 0 3726 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 3727 new Fiji rules. This is a more-compact way to represent 3728 far-future timestamps for America/Godthab, America/Santiago, 3729 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 3730 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 3731 this change. (Derived from a suggestion by Arthur David Olson.) 3732 3733 Allow POSIX-like TZ strings where daylight saving time is in 3734 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 3735 Argentina Summer Time all year. This supports a more-compact way 3736 to represent the 2013d data for America/Argentina/San_Luis. 3737 Because of the change for San Luis noted above this change does not 3738 affect the current data. (Thanks to Andrew Main (Zefram) for 3739 suggestions that improved this change.) 3740 3741 Where these two TZ changes take effect, there is a minor extension 3742 to the tz file format in that it allows new values for the 3743 embedded TZ-format string, and the tz file format version number 3744 has therefore been increased from 2 to 3 as a precaution. 3745 Version-2-based client code should continue to work as before for 3746 all timestamps before 2038. Existing version-2-based client code 3747 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 3748 files, and typically works in practice even for timestamps after 3749 2037; the only known exception is America/Godthab. 3750 3751 Changes affecting timestamps before 1970 3752 3753 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 3754 some errors before 1947. 3755 3756 Some zones have been turned into links, when they differ from existing 3757 zones only in older data entries that were likely invented or that 3758 differ only in LMT or transitions from LMT. These changes affect 3759 only timestamps before 1943. The affected zones are: 3760 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 3761 America/Grenada, America/Guadeloupe, America/Marigot, 3762 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 3763 America/St_Lucia, America/St_Thomas, America/St_Vincent, 3764 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 3765 confirming that the old Europe/Vaduz zone was wrong and the new 3766 link is better for WWII-era times.) 3767 3768 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 3769 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 3770 from 1890 to 1912. 3771 3772 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 3773 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 3774 to Alois Treindl.) 3775 3776 Change the date of the circa-1850 Zurich transition from 1849-09-12 3777 to 1853-07-16, overriding Shanks with data from Messerli about 3778 postal and telegraph time in Switzerland. 3779 3780 Changes affecting time zone abbreviations before 1970 3781 3782 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 3783 as Jakarta was called Batavia back then. 3784 3785 Changes affecting API 3786 3787 The 'zic' command now outputs a dummy transition when far-future 3788 data can't be summarized using a TZ string, and uses a 402-year 3789 window rather than a 400-year window. For the current data, this 3790 affects only the Asia/Tehran file. It does not affect any of the 3791 timestamps that this file represents, so zdump outputs the same 3792 information as before. (Thanks to Andrew Main (Zefram).) 3793 3794 The 'date' command has a new '-r' option, which lets you specify 3795 the integer time to display, a la FreeBSD. 3796 3797 The 'tzselect' command has two new options '-c' and '-n', which lets you 3798 select a zone based on latitude and longitude. 3799 3800 The 'zic' command's '-v' option now warns about constructs that 3801 require the new version-3 binary file format. (Thanks to Arthur 3802 David Olson for the suggestion.) 3803 3804 Support for floating-point time_t has been removed. 3805 It was always dicey, and POSIX no longer requires it. 3806 (Thanks to Eric Blake for suggesting to the POSIX committee to 3807 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 3808 Heninger, Arthur David Olson, and Alois Treindl, for reporting 3809 bugs and elucidating some of the corners of the old floating-point 3810 implementation.) 3811 3812 The signatures of 'offtime', 'timeoff', and 'gtime' have been 3813 changed back to the old practice of using 'long' to represent UT 3814 offsets. This had been inadvertently and mistakenly changed to 3815 'int_fast32_t'. (Thanks to Christos Zoulas.) 3816 3817 The code avoids undefined behavior on integer overflow in some 3818 more places, including gmtime, localtime, mktime and zdump. 3819 3820 Changes affecting the zdump utility 3821 3822 zdump now outputs "UT" when referring to Universal Time, not "UTC". 3823 "UTC" does not make sense for timestamps that predate the introduction 3824 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen 3825 for clarifying UT vs UTC.) 3826 3827 Data changes affecting behavior of tzselect and similar programs 3828 3829 Country code BQ is now called the more-common name "Caribbean Netherlands" 3830 rather than the more-official "Bonaire, St Eustatius & Saba". 3831 3832 Remove from zone.tab the names America/Montreal, America/Shiprock, 3833 and Antarctica/South_Pole, as they are equivalent to existing 3834 same-country-code zones for post-1970 timestamps. The data entries for 3835 these names are unchanged, so the names continue to work as before. 3836 3837 Changes affecting code internals 3838 3839 zic -c now runs way faster on 64-bit hosts when given large numbers. 3840 3841 zic now uses vfprintf to avoid allocating and freeing some memory. 3842 3843 tzselect now computes the list of continents from the data, 3844 rather than have it hard-coded. 3845 3846 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 3847 3848 Changes affecting the build procedure 3849 3850 The 'leapseconds' file is now generated automatically from a 3851 new file 'leap-seconds.list', which is a copy of 3852 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 3853 A new source file 'leapseconds.awk' implements this. 3854 The goal is simplification of the future maintenance of 'leapseconds'. 3855 3856 When building the 'posix' or 'right' subdirectories, if the 3857 subdirectory would be a copy of the default subdirectory, it is 3858 now made a symbolic link if that is supported. This saves about 3859 2 MB of file system space. 3860 3861 The links America/Shiprock and Antarctica/South_Pole have been 3862 moved to the 'backward' file. This affects only nondefault builds 3863 that omit 'backward'. 3864 3865 Changes affecting version-control only 3866 3867 .gitignore now ignores 'date'. 3868 3869 Changes affecting documentation and commentary 3870 3871 Changes to the 'tzfile' man page 3872 3873 It now mentions that the binary file format may be extended in 3874 future versions by appending data. 3875 3876 It now refers to the 'zdump' and 'zic' man pages. 3877 3878 Changes to the 'zic' man page 3879 3880 It lists conditions that elicit a warning with '-v'. 3881 3882 It says that the behavior is unspecified when duplicate names 3883 are given, or if the source of one link is the target of another. 3884 3885 Its examples are updated to match the latest data. 3886 3887 The definition of white space has been clarified slightly. 3888 (Thanks to Michael Deckers.) 3889 3890 Changes to the 'Theory' file 3891 3892 There is a new section about the accuracy of the tz database, 3893 describing the many ways that errors can creep in, and 3894 explaining why so many of the pre-1970 timestamps are wrong or 3895 misleading (thanks to Steve Allen, Lester Caine, and Garrett 3896 Wollman for discussions that contributed to this). 3897 3898 The 'Theory' file describes LMT better (this follows a 3899 suggestion by Guy Harris). 3900 3901 It refers to the 2013 edition of POSIX rather than the 2004 edition. 3902 3903 It's mentioned that excluding 'backward' should not affect the 3904 other data, and it suggests at least one zone.tab name per 3905 inhabited country (thanks to Stephen Colebourne). 3906 3907 Some longstanding restrictions on names are documented, e.g., 3908 'America/New_York' precludes 'America/New_York/Bronx'. 3909 3910 It gives more reasons for the 1970 cutoff. 3911 3912 It now mentions which time_t variants are supported, such as 3913 signed integer time_t. (Thanks to Paul Goyette for reporting 3914 typos in an experimental version of this change.) 3915 3916 (Thanks to Philip Newton for correcting typos in these changes.) 3917 3918 Documentation and commentary is more careful to distinguish UT in 3919 general from UTC in particular. (Thanks to Steve Allen.) 3920 3921 Add a better source for the Zurich 1894 transition. 3922 (Thanks to Pierre-Yves Berger.) 3923 3924 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 3925 3926 3927 Release 2013d - 2013-07-05 07:38:01 -0700 3928 3929 Changes affecting future timestamps: 3930 3931 Morocco's midsummer transitions this year are July 7 and August 10, 3932 not July 9 and August 8. (Thanks to Andrew Paprocki.) 3933 3934 Israel now falls back on the last Sunday of October. 3935 (Thanks to Ephraim Silverberg.) 3936 3937 Changes affecting past timestamps: 3938 3939 Specify Jerusalem's location more precisely; this changes the pre-1880 3940 times by 2 s. 3941 3942 Changing affecting metadata only: 3943 3944 Fix typos in the entries for country codes BQ and SX. 3945 3946 Changes affecting code: 3947 3948 Rework the code to fix a bug with handling Australia/Macquarie on 3949 32-bit hosts (thanks to Arthur David Olson). 3950 3951 Port to platforms like NetBSD, where time_t can be wider than long. 3952 3953 Add support for testing time_t types other than the system's. 3954 Run 'make check_time_t_alternatives' to try this out. 3955 Currently, the tests fail for unsigned time_t; 3956 this should get fixed at some point. 3957 3958 Changes affecting documentation and commentary: 3959 3960 Deemphasize the significance of national borders. 3961 3962 Update the zdump man page. 3963 3964 Remove obsolete NOID comment (thanks to Denis Excoffier). 3965 3966 Update several URLs and comments in the web pages. 3967 3968 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 3969 3970 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 3971 3972 3973 Release 2013c - 2013-04-19 16:17:40 -0700 3974 3975 Changes affecting current and future timestamps: 3976 3977 Palestine observed DST starting March 29, 2013. (Thanks to 3978 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 3979 with the predicted rules being the last Thursday in March at 24:00 3980 to the first Friday on or after September 21 at 01:00. 3981 3982 Assume that the recent change to Paraguay's DST rules is permanent, 3983 by moving the end of DST to the 4th Sunday in March every year. 3984 (Thanks to Carlos Ral Perasso.) 3985 3986 Changes affecting past timestamps: 3987 3988 Fix some historical data for Palestine to agree with that of 3989 timeanddate.com, as follows: 3990 3991 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 3992 00:00 Apr 1. 3993 3994 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 3995 02:00. 3996 3997 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 3998 3999 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 4000 4001 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 4002 4003 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 4004 4005 Fix times of habitation for Macquarie to agree with the Tasmania 4006 Parks & Wildlife Service history, which indicates that permanent 4007 habitation was 1899-1919 and 1948 on. 4008 4009 Changing affecting metadata only: 4010 4011 Macquarie Island is politically part of Australia, not Antarctica. 4012 (Thanks to Tobias Conradi.) 4013 4014 Sort Macquarie more-consistently with other parts of Australia. 4015 (Thanks to Tim Parenti.) 4016 4017 4018 Release 2013b - 2013-03-10 22:33:40 -0700 4019 4020 Changes affecting current and future timestamps: 4021 4022 Haiti uses US daylight-saving rules this year, and presumably future years. 4023 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 4024 4025 Paraguay will end DST on March 24 this year. 4026 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 4027 4028 Morocco does not observe DST during Ramadan; 4029 try to predict Ramadan in Morocco as best we can. 4030 (Thanks to Erik Homoet for the heads-up.) 4031 4032 Changes affecting commentary: 4033 4034 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 4035 Update URL for Solaris. Mention Internet RFC 6557. 4036 Update Internet RFCs 2445->5545, 2822->5322. 4037 Switch from FTP to HTTP for Internet RFCs. 4038 4039 4040 Release 2013a - 2013-02-27 09:20:35 -0800 4041 4042 Change affecting binary data format: 4043 4044 The zone offset at the end of version-2-format zone files is now 4045 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 4046 4047 Changes affecting current and future timestamps: 4048 4049 Chile's 2013 rules, and we guess rules for 2014 and later, will be 4050 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 4051 (Thanks to Steffen Thorsen and Robert Elz.) 4052 4053 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 4054 (Thanks to Tobias Conradi and Arthur David Olson.) 4055 4056 Many changes affect historical timestamps before 1940. 4057 These were deduced from: Milne J. Civil time. Geogr J. 1899 4058 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 4059 4060 Changes affecting the code: 4061 4062 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 4063 the data). (Thanks to Arthur David Olson.) 4064 4065 Fix localtime bug when time_t is unsigned and data files were generated 4066 by a signed time_t system. (Thanks to Doug Bailey for reporting and 4067 to Arthur David Olson for fixing.) 4068 4069 Allow the email address for bug reports to be set by the packager. 4070 The default is tz (a] iana.org, as before. (Thanks to Joseph S. Myers.) 4071 4072 Update HTML checking to be compatible with Ubuntu 12.10. 4073 4074 Check that files are a safe subset of ASCII. At some point we may 4075 relax this requirement to a safe subset of UTF-8. Without the 4076 check, some non-UTF-8 encodings were leaking into the distribution. 4077 4078 Commentary changes: 4079 4080 Restore a comment about copyright notices that was inadvertently deleted. 4081 (Thanks to Arthur David Olson.) 4082 4083 Improve the commentary about which districts observe what times 4084 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 4085 4086 Add web page links to tz.js. 4087 4088 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 4089 4090 4091 Release 2012j - 2012-11-12 18:34:49 -0800 4092 4093 Libya moved to CET this weekend, but with DST planned next year. 4094 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 4095 4096 Signatures now have the extension .asc, not .sign, as that's more 4097 standard. (Thanks to Phil Pennock.) 4098 4099 The output of 'zdump --version', and of 'zic --version', now 4100 uses a format that is more typical for --version. 4101 (Thanks to Joseph S. Myers.) 4102 4103 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 4104 now uses tz (a] iana.org rather than the old elsie address. 4105 4106 zic -v now complains about abbreviations that are less than 3 4107 or more than 6 characters, as per Posix. Formerly, it checked 4108 for abbreviations that were more than 3. 4109 4110 'make public' no longer puts its temporary directory under /tmp, 4111 and uses the just-built zic rather than the system zic. 4112 4113 Various fixes to documentation and commentary. 4114 4115 4116 Release 2012i - 2012-11-03 12:57:09 -0700 4117 4118 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 4119 4120 Linker flags can now be specified via LDFLAGS. 4121 AWK now defaults to 'awk', not 'nawk'. 4122 The shell in tzselect now defaults to /bin/bash, but this can 4123 be overridden by specifying KSHELL. 4124 The main web page now mentions the unofficial GitHub repository. 4125 (Thanks to Mike Frysinger.) 4126 4127 Tarball signatures can now be built by running 'make signatures'. 4128 There are also new makefile rules 'tarballs', 'check_public', and 4129 separate makefile rules for each tarball and signature file. 4130 A few makefile rules are now more portable to strict POSIX. 4131 4132 The main web page now lists the canonical IANA URL. 4133 4134 4135 Release 2012h - 2012-10-26 22:49:10 -0700 4136 4137 Bahia no longer has DST. (Thanks to Kelley Cook.) 4138 4139 Tocantins has DST. (Thanks to Rodrigo Severo.) 4140 4141 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 4142 4143 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 4144 4145 Web page updates. 4146 4147 More C modernization, except that at Arthur David Olson's suggestion 4148 the instances of 'register' were kept. 4149 4150 4151 Release 2012g - 2012-10-17 20:59:45 -0700 4152 4153 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 4154 4155 Palestine fall 2012. (Thanks to Steffen Thorsen.) 4156 4157 Assume C89. 4158 4159 To attack the version-number problem, this release ships the file 4160 'Makefile' (which contains the release number) in both the tzcode and 4161 the tzdata tarballs. The two Makefiles are identical, and should be 4162 identical in any matching pair of tarballs, so it shouldn't matter 4163 which order you extract the tarballs. Perhaps we can come up with a 4164 better version-number scheme at some point; this scheme does have the 4165 virtue of not adding more files. 4166 4167 4168 Release 2012f - 2012-09-12 23:17:03 -0700 4169 4170 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 4171 20 this year. (Thanks to Steffen Thorsen.) 4172 4173 4174 Release 2012e - 2012-08-02 20:44:55 -0700 4175 4176 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 4177 (Thanks to Steffen Thorsen.) 4178 4179 * Use a single version number for both code and data. 4180 4181 * .gitignore: New file. 4182 4183 * Remove trailing white space. 4184 4185 4186 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 4187 4188 Changes for Morocco's timestamps, which take effect in a couple of 4189 hours, along with infrastructure changes to accommodate how the tz 4190 code and data are released on IANA. 4191 4192 4193 Release data2012c - 2012-03-27 12:17:25 -0400 4194 4195 africa 4196 Summer time changes for Morocco (to start late April 2012) 4197 4198 asia 4199 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 4200 4201 northamerica 4202 Haiti following US/Canada rules for 2012 (and we're assuming, 4203 for now anyway, for the future). 4204 4205 4206 Release 2012b - 2012-03-02 12:29:15 +0700 4207 4208 There is just one change to tzcode2012b (compared with 2012a): 4209 the Makefile that was accidentally included with 2012a has been 4210 replaced with the version that should have been there, which is 4211 identical with the previous version (from tzcode2011i). 4212 4213 There are just two changes in tzdata2012b compared with 2012a. 4214 4215 Most significantly, summer time in Cuba has been delayed 3 weeks 4216 (now starts April 1 rather than March 11). Since Mar 11 (the old start 4217 date, as listed in 2012a) is just a little over a week away, this 4218 change is urgent. 4219 4220 Less importantly, an excess tab in one of the changes in zone.tab 4221 in 2012a has been removed. 4222 4223 4224 Release 2012a - 2012-03-01 18:28:10 +0700 4225 4226 The changes in tzcode2012a (compared to the previous version, 2011i) 4227 are entirely to the README and tz-art.htm and tz-link.htm files, if 4228 none of those concern you, you can ignore the code update. The changes 4229 reflect the changed addresses for the mailing list and the code and 4230 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 4231 has been added to tz-link.htm). 4232 4233 In tzdata2012a (compared to the previous release, which was 2011n) 4234 the major changes are: 4235 Chile 2011/2012 and 2012/2013 summer time date adjustments. 4236 Falkland Islands onto permanent summer time (we're assuming for the 4237 foreseeable future, though 2012 is all we're fairly certain of.) 4238 Armenia has abolished Summer Time. 4239 Tokelau jumped the International Date Line back last December 4240 (just the same as their near neighbour, Samoa). 4241 America/Creston is a new zone for a small area of British Columbia 4242 There will be a leapsecond 2012-06-30 23:59:60 UTC. 4243 4244 Other minor changes are: 4245 Corrections to 1918 Canadian summer time end dates. 4246 Updated URL for UK time zone history (in comments) 4247 A few typos in Le Corre's list of free French place names (comments) 4248 4249 4250 Release data2011n - 2011-10-30 14:57:54 +0700 4251 4252 There are three changes of note - most urgently, Cuba (America/Havana) 4253 has extended summer time by two weeks, now to end on Nov 13, rather than 4254 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 4255 (Europe/Tiraspol) decided not to split from the rest of Moldova after 4256 all, and consequently that zone has been removed (again) and reinstated 4257 in the "backward" file as a link to Europe/Chisinau. And third, the 4258 end date for Fiji's summer time this summer was moved forward from the 4259 earlier planned Feb 26, to Jan 22. 4260 4261 Apart from that, Moldova (MD) returns to a single entry in zone.tab 4262 (and the incorrect syntax that was in the 2011m version of that file 4263 is so fixed - it would have been fixed in a different way had this 4264 change not happened - that's the "missing" sccs version id). 4265 4266 4267 Release data2011m - 2011-10-24 21:42:16 +0700 4268 4269 In particular, the typos in comments in the data (2011-11-17 should have 4270 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 4271 Tim Parenti noted) have been fixed, and the change for Ukraine has been 4272 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to 4273 Tim Parenti, and also Denys Gavrysh) 4274 4275 In addition, I added Europe/Tiraspol to zone.tab. 4276 4277 This time, all the files have new version numbers... (including the files 4278 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 4279 version numbers there...) 4280 4281 4282 Release data2011l - 2011-10-10 11:15:43 +0700 4283 4284 There are just 2 changes that cause different generated tzdata files from 4285 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 4286 is included, but commented out. Compared with the diff I sent out last week, 4287 this version also includes attributions for the sources for the changes 4288 (in much the same format as ado used, but the html tags have not been 4289 checked, verified, or used in any way at all, so if there are errors there, 4290 please let me know.) 4291 4292 4293 Release data2011k - 2011-09-20 17:54:03 -0400 4294 4295 [not summarized] 4296 4297 4298 Release data2011j - 2011-09-12 09:22:49 -0400 4299 4300 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 4301 Tanzania); there are also two spelling corrections to comments in 4302 the australasia file (with thanks to Christos Zoulas). 4303 4304 4305 Release 2011i - 2011-08-29 05:56:32 -0400 4306 4307 [not summarized] 4308 4309 4310 Release data2011h - 2011-06-15 18:41:48 -0400 4311 4312 Russia and Curaao changes 4313 4314 4315 Release 2011g - 2011-04-25 09:07:22 -0400 4316 4317 update the rules for Egypt to reflect its abandonment of DST this year 4318 4319 4320 Release 2011f - 2011-04-06 17:14:53 -0400 4321 4322 [not summarized] 4323 4324 4325 Release 2011e - 2011-03-31 16:04:38 -0400 4326 4327 Morocco, Chile, and tz-link changes 4328 4329 4330 Release 2011d - 2011-03-14 09:18:01 -0400 4331 4332 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 4333 4334 4335 Release 2011c - 2011-03-07 09:30:09 -0500 4336 4337 These do affect current timestamps in Chile and Annette Island, Canada. 4338 4339 4340 Release 2011b - 2011-02-07 08:44:50 -0500 4341 4342 [not summarized] 4343 4344 4345 Release 2011a - 2011-01-24 10:30:16 -0500 4346 4347 [not summarized] 4348 4349 4350 Release data2010o - 2010-11-01 09:18:23 -0400 4351 4352 change to the end of DST in Fiji in 2011 4353 4354 4355 Release 2010n - 2010-10-25 08:19:17 -0400 4356 4357 [not summarized] 4358 4359 4360 Release 2010m - 2010-09-27 09:24:48 -0400 4361 4362 Hong Kong, Vostok, and zic.c changes 4363 4364 4365 Release 2010l - 2010-08-16 06:57:25 -0400 4366 4367 [not summarized] 4368 4369 4370 Release 2010k - 2010-07-26 10:42:27 -0400 4371 4372 [not summarized] 4373 4374 4375 Release 2010j - 2010-05-10 09:07:48 -0400 4376 4377 changes for Baha de Banderas and for version naming 4378 4379 4380 Release data2010i - 2010-04-16 18:50:45 -0400 4381 4382 the end of DST in Morocco on 2010-08-08 4383 4384 4385 Release data2010h - 2010-04-05 09:58:56 -0400 4386 4387 [not summarized] 4388 4389 4390 Release data2010g - 2010-03-24 11:14:53 -0400 4391 4392 [not summarized] 4393 4394 4395 Release 2010f - 2010-03-22 09:45:46 -0400 4396 4397 [not summarized] 4398 4399 4400 Release data2010e - 2010-03-08 14:24:27 -0500 4401 4402 corrects the Dhaka bug found by Danvin Ruangchan 4403 4404 4405 Release data2010d - 2010-03-06 07:26:01 -0500 4406 4407 [not summarized] 4408 4409 4410 Release 2010c - 2010-03-01 09:20:58 -0500 4411 4412 changes including KRE's suggestion for earlier initialization of 4413 "goahead" and "goback" structure elements 4414 4415 4416 Release code2010a - 2010-02-16 10:40:04 -0500 4417 4418 [not summarized] 4419 4420 4421 Release data2010b - 2010-01-20 12:37:01 -0500 4422 4423 Mexico changes 4424 4425 4426 Release data2010a - 2010-01-18 08:30:04 -0500 4427 4428 changes to Dhaka 4429 4430 4431 Release data2009u - 2009-12-26 08:32:28 -0500 4432 4433 changes to DST in Bangladesh 4434 4435 4436 Release 2009t - 2009-12-21 13:24:27 -0500 4437 4438 [not summarized] 4439 4440 4441 Release data2009s - 2009-11-14 10:26:32 -0500 4442 4443 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 4444 4445 4446 Release 2009r - 2009-11-09 10:10:31 -0500 4447 4448 "antarctica" and "tz-link.htm" changes 4449 4450 4451 Release 2009q - 2009-11-02 09:12:40 -0500 4452 4453 with two corrections as reported by Eric Muller and Philip Newton 4454 4455 4456 Release data2009p - 2009-10-23 15:05:27 -0400 4457 4458 Argentina (including San Luis) changes (with the correction from 4459 Mariano Absatz) 4460 4461 4462 Release data2009o - 2009-10-14 16:49:38 -0400 4463 4464 Samoa (commentary only), Pakistan, and Bangladesh changes 4465 4466 4467 Release data2009n - 2009-09-22 15:13:38 -0400 4468 4469 added commentary for Argentina and a change to the end of DST in 4470 2009 in Pakistan 4471 4472 4473 Release data2009m - 2009-09-03 10:23:43 -0400 4474 4475 Samoa and Palestine changes 4476 4477 4478 Release data2009l - 2009-08-14 09:13:07 -0400 4479 4480 Samoa (comments only) and Egypt 4481 4482 4483 Release 2009k - 2009-07-20 09:46:08 -0400 4484 4485 [not summarized] 4486 4487 4488 Release data2009j - 2009-06-15 06:43:59 -0400 4489 4490 Bangladesh change (with a short turnaround since the DST change is 4491 impending) 4492 4493 4494 Release 2009i - 2009-06-08 09:21:22 -0400 4495 4496 updating for DST in Bangladesh this year 4497 4498 4499 Release 2009h - 2009-05-26 09:19:14 -0400 4500 4501 [not summarized] 4502 4503 4504 Release data2009g - 2009-04-20 16:34:07 -0400 4505 4506 Cairo 4507 4508 4509 Release data2009f - 2009-04-10 11:00:52 -0400 4510 4511 correct DST in Pakistan 4512 4513 4514 Release 2009e - 2009-04-06 09:08:11 -0400 4515 4516 [not summarized] 4517 4518 4519 Release 2009d - 2009-03-23 09:38:12 -0400 4520 4521 Morocco, Tunisia, Argentina, and American Astronomical Society changes 4522 4523 4524 Release data2009c - 2009-03-16 09:47:51 -0400 4525 4526 change to the start of Cuban DST 4527 4528 4529 Release 2009b - 2009-02-09 11:15:22 -0500 4530 4531 [not summarized] 4532 4533 4534 Release 2009a - 2009-01-21 10:09:39 -0500 4535 4536 [not summarized] 4537 4538 4539 Release data2008i - 2008-10-21 12:10:25 -0400 4540 4541 southamerica and zone.tab files, with Argentina DST rule changes and 4542 United States zone reordering and recommenting 4543 4544 4545 Release 2008h - 2008-10-13 07:33:56 -0400 4546 4547 [not summarized] 4548 4549 4550 Release 2008g - 2008-10-06 09:03:18 -0400 4551 4552 Fix a broken HTML anchor and update Brazil's DST transitions; 4553 there's also a slight reordering of information in tz-art.htm. 4554 4555 4556 Release data2008f - 2008-09-09 22:33:26 -0400 4557 4558 [not summarized] 4559 4560 4561 Release 2008e - 2008-07-28 14:11:17 -0400 4562 4563 changes by Arthur David Olson and Jesper Nrgaard Welen 4564 4565 4566 Release data2008d - 2008-07-07 09:51:38 -0400 4567 4568 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 4569 4570 4571 Release data2008c - 2008-05-19 17:48:03 -0400 4572 4573 Pakistan, Morocco, and Mongolia 4574 4575 4576 Release data2008b - 2008-03-24 08:30:59 -0400 4577 4578 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 4579 link provided 4580 4581 4582 Release 2008a - 2008-03-08 05:42:16 -0500 4583 4584 [not summarized] 4585 4586 4587 Release 2007k - 2007-12-31 10:25:22 -0500 4588 4589 most importantly, changes to the "southamerica" file based on 4590 Argentina's readoption of daylight saving time 4591 4592 4593 Release 2007j - 2007-12-03 09:51:01 -0500 4594 4595 1. eliminate the "P" (parameter) macro; 4596 4597 2. the "noncontroversial" changes circulated on the time zone 4598 mailing list (less the changes to "logwtmp.c"); 4599 4600 3. eliminate "too many transition" errors when "min" is used in time 4601 zone rules; 4602 4603 4. changes by Paul Eggert (including updated information for Venezuela). 4604 4605 4606 Release data2007i - 2007-10-30 10:28:11 -0400 4607 4608 changes for Cuba and Syria 4609 4610 4611 Release 2007h - 2007-10-01 10:05:51 -0400 4612 4613 changes by Paul Eggert, as well as an updated link to the ICU 4614 project in tz-link.htm 4615 4616 4617 Release 2007g - 2007-08-20 10:47:59 -0400 4618 4619 changes by Paul Eggert 4620 4621 The "leapseconds" file has been updated to incorporate the most 4622 recent International Earth Rotation and Reference Systems Service 4623 (IERS) bulletin. 4624 4625 There's an addition to tz-art.htm regarding the television show "Medium". 4626 4627 4628 Release 2007f - 2007-05-07 10:46:46 -0400 4629 4630 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 4631 Zealand) 4632 4633 changes to zic.c to allow hour values greater than 24 (along with 4634 Paul's improved time value overflow checking) 4635 4636 4637 Release 2007e - 2007-04-02 10:11:52 -0400 4638 4639 Syria and Honduras changes by Paul Eggert 4640 4641 zic.c variable renaming changes by Arthur David Olson 4642 4643 4644 Release 2007d - 2007-03-20 08:48:30 -0400 4645 4646 changes by Paul Eggert 4647 4648 the elimination of white space at the ends of lines 4649 4650 4651 Release 2007c - 2007-02-26 09:09:37 -0500 4652 4653 changes by Paul Eggert 4654 4655 4656 Release 2007b - 2007-02-12 09:34:20 -0500 4657 4658 Paul Eggert's proposed change to the quotation handling logic in zic.c. 4659 4660 changes to the commentary in "leapseconds" reflecting the IERS 4661 announcement that there is to be no positive leap second at the end 4662 of June 2007. 4663 4664 4665 Release 2007a - 2007-01-08 12:28:29 -0500 4666 4667 changes by Paul Eggert 4668 4669 Derick Rethans's Asmara change 4670 4671 Oscar van Vlijmen's Easter Island local mean time change 4672 4673 symbolic link changes 4674 4675 4676 Release 2006p - 2006-11-27 08:54:27 -0500 4677 4678 changes by Paul Eggert 4679 4680 4681 Release 2006o - 2006-11-06 09:18:07 -0500 4682 4683 changes by Paul Eggert 4684 4685 4686 Release 2006n - 2006-10-10 11:32:06 -0400 4687 4688 changes by Paul Eggert 4689 4690 4691 Release 2006m - 2006-10-02 15:32:35 -0400 4692 4693 changes for Uruguay, Palestine, and Egypt by Paul Eggert 4694 4695 (minimalist) changes to zic.8 to clarify "until" information 4696 4697 4698 Release data2006l - 2006-09-18 12:58:11 -0400 4699 4700 Paul's best-effort work on this coming weekend's Egypt time change 4701 4702 4703 Release 2006k - 2006-08-28 12:19:09 -0400 4704 4705 changes by Paul Eggert 4706 4707 4708 Release 2006j - 2006-08-21 09:56:32 -0400 4709 4710 changes by Paul Eggert 4711 4712 4713 Release code2006i - 2006-08-07 12:30:55 -0400 4714 4715 localtime.c fixes 4716 4717 Ken Pizzini's conversion script 4718 4719 4720 Release code2006h - 2006-07-24 09:19:37 -0400 4721 4722 adds public domain notices to four files 4723 4724 includes a fix for transition times being off by a second 4725 4726 adds a new recording to the "arts" file (information courtesy Colin Bowern) 4727 4728 4729 Release 2006g - 2006-05-08 17:18:09 -0400 4730 4731 northamerica changes by Paul Eggert 4732 4733 4734 Release 2006f - 2006-05-01 11:46:00 -0400 4735 4736 a missing version number problem is fixed (with thanks to Bradley 4737 White for catching the problem) 4738 4739 4740 Release 2006d - 2006-04-17 14:33:43 -0400 4741 4742 changes by Paul Eggert 4743 4744 added new items to tz-arts.htm that were found by Paul 4745 4746 4747 Release 2006c - 2006-04-03 10:09:32 -0400 4748 4749 two sets of data changes by Paul Eggert 4750 4751 a fencepost error fix in zic.c 4752 4753 changes to zic.c and the "europe" file to minimize differences 4754 between output produced by the old 32-bit zic and the new 64-bit 4755 version 4756 4757 4758 Release 2006b - 2006-02-20 10:08:18 -0500 4759 [tz32code2006b + tz64code2006b + tzdata2006b] 4760 4761 64-bit code 4762 4763 All SCCS IDs were bumped to "8.1" for this release. 4764 4765 4766 Release 2006a - 2006-01-30 08:59:31 -0500 4767 4768 changes by Paul Eggert (in particular, Indiana time zone moves) 4769 4770 an addition to the zic manual page to describe how special-case 4771 transitions are handled 4772 4773 4774 Release 2005r - 2005-12-27 09:27:13 -0500 4775 4776 Canadian changes by Paul Eggert 4777 4778 They also add "<pre>" directives to time zone data files and reflect 4779 changes to warning message logic in "zdump.c" (but with calls to 4780 "gettext" kept unbundled at the suggestion of Ken Pizzini). 4781 4782 4783 Release 2005q - 2005-12-13 09:17:09 -0500 4784 4785 Nothing earth-shaking here: 4786 1. Electronic mail addresses have been removed. 4787 2. Casts of the return value of exit have been removed. 4788 3. Casts of the argument of is.* macros have been added. 4789 4. Indentation in one section of zic.c has been fixed. 4790 5. References to dead URLs in the data files have been dealt with. 4791 4792 4793 Release 2005p - 2005-12-05 10:30:53 -0500 4794 4795 "systemv", "tz-link.htm", and "zdump.c" changes 4796 (less the casts of arguments to the is* macros) 4797 4798 4799 Release 2005o - 2005-11-28 10:55:26 -0500 4800 4801 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 4802 4803 zdump.c lint fixes by Arthur David Olson 4804 4805 4806 Release 2005n - 2005-10-03 09:44:09 -0400 4807 4808 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 4809 et al. changes) 4810 4811 4812 Release 2005m - 2005-08-29 12:15:40 -0400 4813 4814 changes by Paul Eggert (with a small tweak to the tz-art change) 4815 4816 a declaration of an unused variable has been removed from zdump.c 4817 4818 4819 Release 2005l - 2005-08-22 12:06:39 -0400 4820 4821 changes by Paul Eggert 4822 4823 overflow/underflow checks by Arthur David Olson, minus changes to 4824 the "Theory" file about the pending addition of 64-bit data (I grow 4825 less confident of the changes being accepted with each passing day, 4826 and the changes no longer increase the data files nine-fold--there's 4827 less than a doubling in size by my local Sun's reckoning) 4828 4829 4830 Release 2005k - 2005-07-14 14:14:24 -0400 4831 4832 The "leapseconds" file has been edited to reflect the recently 4833 announced leap second at the end of 2005. 4834 4835 I've also deleted electronic mail addresses from the files as an 4836 anti-spam measure. 4837 4838 4839 Release 2005j - 2005-06-13 14:34:13 -0400 4840 4841 These reflect changes to limit the length of time zone abbreviations 4842 and the characters used in those abbreviations. 4843 4844 There are also changes to handle POSIX-style "quoted" timezone 4845 environment variables. 4846 4847 The changes were circulated on the time zone mailing list; the only 4848 change since then was the removal of a couple of minimum-length of 4849 abbreviation checks. 4850 4851 4852 Release data2005i - 2005-04-21 15:04:16 -0400 4853 4854 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 4855 4856 4857 Release 2005h - 2005-04-04 11:24:47 -0400 4858 4859 changes by Paul Eggert 4860 4861 minor changes to Makefile and zdump.c to produce more useful output 4862 when doing a "make typecheck" 4863 4864 4865 Release 2005g - 2005-03-14 10:11:21 -0500 4866 4867 changes by Paul Eggert (a change to current DST rules in Uruguay and 4868 an update to a link to time zone software) 4869 4870 4871 Release 2005f - 2005-03-01 08:45:32 -0500 4872 4873 data and documentation changes by Paul Eggert 4874 4875 4876 Release 2005e - 2005-02-10 15:59:44 -0500 4877 4878 [not summarized] 4879 4880 4881 Release code2005d - 2005-01-31 09:21:47 -0500 4882 4883 make zic complain about links to links if the -v flag is used 4884 4885 have "make public" do more code checking 4886 4887 add an include to "localtime.c" for the benefit of gcc systems 4888 4889 4890 Release 2005c - 2005-01-17 18:36:29 -0500 4891 4892 get better results when mktime runs on a system where time_t is double 4893 4894 changes to the data files (most importantly to Paraguay) 4895 4896 4897 Release 2005b - 2005-01-10 09:19:54 -0500 4898 4899 Get localtime and gmtime working on systems with exotic time_t types. 4900 4901 Update the leap second commentary in the "leapseconds" file. 4902 4903 4904 Release 2005a - 2005-01-01 13:13:44 -0500 4905 4906 [not summarized] 4907 4908 4909 Release code2004i - 2004-12-14 13:42:58 -0500 4910 4911 Deal with systems where time_t is unsigned. 4912 4913 4914 Release code2004h - 2004-12-07 11:40:18 -0500 4915 4916 64-bit-time_t changes 4917 4918 4919 Release 2004g - 2004-11-02 09:06:01 -0500 4920 4921 update to Cuba (taking effect this weekend) 4922 4923 other changes by Paul Eggert 4924 4925 correction of the spelling of Oslo 4926 4927 changed versions of difftime.c and private.h 4928 4929 4930 Release code2004f - 2004-10-21 10:25:22 -0400 4931 4932 Cope with wide-ranging tm_year values. 4933 4934 4935 Release 2004e - 2004-10-11 14:47:21 -0400 4936 4937 Brazil/Argentina/Israel changes by Paul Eggert 4938 4939 changes to tz-link.htm by Paul 4940 4941 one small fix to Makefile 4942 4943 4944 Release 2004d - 2004-09-22 08:27:29 -0400 4945 4946 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 4947 4948 4949 Release 2004c - 2004-08-11 12:06:26 -0400 4950 4951 asctime-related changes 4952 4953 (variants of) some of the documentation changes suggested by Paul Eggert 4954 4955 4956 Release 2004b - 2004-07-19 14:33:35 -0400 4957 4958 data changes by Paul Eggert - most importantly, updates for Argentina 4959 4960 4961 Release 2004a - 2004-05-27 12:00:47 -0400 4962 4963 changes by Paul Eggert 4964 4965 Handle DST transitions that occur at the end of a month in some 4966 years but at the start of the following month in other years. 4967 4968 Add a copy of the correspondence that's the basis for claims about 4969 DST in the Navajo Nation. 4970 4971 4972 Release 2003e - 2003-12-15 09:36:47 -0500 4973 4974 changes by Arthur David Olson (primarily code changes) 4975 4976 changes by Paul Eggert (primarily data changes) 4977 4978 minor changes to "Makefile" and "northamerica" (in the latter case, 4979 optimization of the "Toronto" rules) 4980 4981 4982 Release 2003d - 2003-10-06 09:34:44 -0400 4983 4984 changes by Paul Eggert 4985 4986 4987 Release 2003c - 2003-09-16 10:47:05 -0400 4988 4989 Fix bad returns in zic.c's inleap function. 4990 Thanks to Bradley White for catching the problem! 4991 4992 4993 Release 2003b - 2003-09-16 07:13:44 -0400 4994 4995 Add a "--version" option (and documentation) to the zic and zdump commands. 4996 4997 changes to overflow/underflow checking in zic 4998 4999 a localtime typo fix. 5000 5001 Update the leapseconds and tz-art.htm files. 5002 5003 5004 Release 2003a - 2003-03-24 09:30:54 -0500 5005 5006 changes by Paul Eggert 5007 5008 a few additions and modifications to the tz-art.htm file 5009 5010 5011 Release 2002d - 2002-10-15 13:12:42 -0400 5012 5013 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 5014 5015 There's also a new time zone quote in "tz-art.htm". 5016 5017 5018 Release 2002c - 2002-04-04 11:55:20 -0500 5019 5020 changes by Paul Eggert 5021 5022 Change zic.c to avoid creating symlinks to files that don't exist. 5023 5024 5025 Release 2002b - 2002-01-28 12:56:03 -0500 5026 5027 [These change notes are for Release 2002a, which was corrupted. 5028 2002b was a corrected version of 2002a.] 5029 5030 changes by Paul Eggert 5031 5032 Update the "leapseconds" file to note that there'll be no leap 5033 second at the end of June, 2002. 5034 5035 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 5036 5037 Change to "difftime.c" to avoid sizeof problems. 5038 5039 5040 Release 2001d - 2001-10-09 13:31:32 -0400 5041 5042 changes by Paul Eggert 5043 5044 5045 Release 2001c - 2001-06-05 13:59:55 -0400 5046 5047 changes by Paul Eggert and Andrew Brown 5048 5049 5050 Release 2001b - 2001-04-05 16:44:38 -0400 5051 5052 changes by Paul Eggert (modulo jnorgard's typo fix) 5053 5054 tz-art.htm has been HTMLified. 5055 5056 5057 Release 2001a - 2001-03-13 12:57:44 -0500 5058 5059 changes by Paul Eggert 5060 5061 An addition to the "leapseconds" file: comments with the text of the 5062 latest IERS leap second notice. 5063 5064 Trailing white space has been removed from data file lines, and 5065 repeated spaces in "Rule Jordan" lines in the "asia" file have been 5066 converted to tabs. 5067 5068 5069 Release 2000h - 2000-12-14 15:33:38 -0500 5070 5071 changes by Paul Eggert 5072 5073 one typo fix in the "art" file 5074 5075 With providence, this is the last update of the millennium. 5076 5077 5078 Release 2000g - 2000-10-10 11:35:22 -0400 5079 5080 changes by Paul Eggert 5081 5082 correction of John Mackin's name submitted by Robert Elz 5083 5084 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 5085 Emmy Awards broadcast. 5086 5087 5088 Release 2000f - 2000-08-10 09:31:58 -0400 5089 5090 changes by Paul Eggert 5091 5092 Added information in "tz-art.htm" on a Seinfeld reference to DST. 5093 5094 Error checking and messages in the "yearistype" script have been 5095 improved. 5096 5097 5098 Release 2000e - 2000-07-31 09:27:54 -0400 5099 5100 data changes by Paul Eggert 5101 5102 a change to the default value of the defined constant HAVE_STRERROR 5103 5104 the addition of a Dave Barry quote on DST to the tz-arts file 5105 5106 5107 Release 2000d - 2000-04-20 15:43:04 -0400 5108 5109 changes to the documentation and code of strftime for C99 conformance 5110 5111 a bug fix for date.c 5112 5113 These are based on (though modified from) changes by Paul Eggert. 5114 5115 5116 Release 2000c - 2000-03-04 10:31:43 -0500 5117 5118 changes by Paul Eggert 5119 5120 5121 Release 2000b - 2000-02-21 12:16:29 -0500 5122 5123 changes by Paul Eggert and Joseph Myers 5124 5125 modest tweaks to the tz-art.htm and tz-link.htm files 5126 5127 5128 Release 2000a - 2000-01-18 09:21:26 -0500 5129 5130 changes by Paul Eggert 5131 5132 The two hypertext documents have also been renamed. 5133 5134 5135 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 5136 5137 Paul Eggert's changes 5138 5139 additions to the "zic" manual page and the "Arts.htm" file 5140 5141 5142 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 5143 5144 [not summarized] 5145 5146 5147 Release data1999h - 1999-10-07 03:50:29 -0400 5148 5149 changes by Paul Eggert to "europe" (most importantly, fixing 5150 Lithuania and Estonia) 5151 5152 5153 Release 1999g - 1999-09-28 11:06:18 -0400 5154 5155 data changes by Paul Eggert (most importantly, the change for 5156 Lebanon that buys correctness for this coming Sunday) 5157 5158 The "code" file contains changes to "Makefile" and "checktab.awk" to 5159 allow better checking of time zone files before they are published. 5160 5161 5162 Release 1999f - 1999-09-23 09:48:14 -0400 5163 5164 changes by Arthur David Olson and Paul Eggert 5165 5166 5167 Release 1999e - 1999-08-17 15:20:54 -0400 5168 5169 changes circulated by Paul Eggert, although the change to handling 5170 of DST-specifying timezone names has been commented out for now 5171 (search for "XXX" in "localtime.c" for details). These files also 5172 do not make any changes to the start of DST in Brazil. 5173 5174 In addition to Paul's changes, there are updates to "Arts.htm" and 5175 cleanups of URLs. 5176 5177 5178 Release 1999d - 1999-03-30 11:31:07 -0500 5179 5180 changes by Paul Eggert 5181 5182 The Makefile's "make public" rule has also been changed to do a test 5183 compile of each individual time zone data file (which should help 5184 avoid problems such as the one we had with Nicosia). 5185 5186 5187 Release 1999c - 1999-03-25 09:47:47 -0500 5188 5189 changes by Paul Eggert, most importantly the change for Chile. 5190 5191 5192 Release 1999b - 1999-02-01 17:51:44 -0500 5193 5194 changes by Paul Eggert 5195 5196 code changes (suggested by Mani Varadarajan, mani at be.com) for 5197 correct handling of symbolic links when building using a relative directory 5198 5199 code changes to generate correct messages for failed links 5200 5201 updates to the URLs in Arts.htm 5202 5203 5204 Release 1999a - 1999-01-19 16:20:29 -0500 5205 5206 error message internationalizations and corrections in zic.c and 5207 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 5208 to whom thanks!) 5209 5210 5211 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 5212 5213 changes for Brazil, Chile, and Germany 5214 5215 support for use of "24:00" in the input files for the time zone compiler 5216 5217 5218 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 5219 5220 changes by Paul Eggert 5221 5222 correction to a define in the "private.h" file 5223 5224 5225 Release data1998g - 1998-08-11 03:28:35 -0000 5226 [tzdata1998g.tar.gz is missing!] 5227 5228 Lithuanian change provided by mgedmin at pub.osf.it 5229 5230 Move creation of the GMT link with Etc/GMT to "etcetera" (from 5231 "backward") to ensure that the GMT file is created even where folks 5232 don't want the "backward" links (as suggested by Paul Eggert). 5233 5234 5235 Release data1998f - 1998-07-20 13:50:00 -0000 5236 [tzdata1998f.tar.gz is missing!] 5237 5238 Update the "leapseconds" file to include the newly-announced 5239 insertion at the end of 1998. 5240 5241 5242 Release code1998f - 1998-06-01 10:18:31 -0400 5243 5244 addition to localtime.c by Guy Harris 5245 5246 5247 Release 1998e - 1998-05-28 09:56:26 -0400 5248 5249 The Makefile is changed to produce zoneinfo-posix rather than 5250 zoneinfo/posix, and to produce zoneinfo-leaps rather than 5251 zoneinfo/right. 5252 5253 data changes by Paul Eggert 5254 5255 changes from Guy Harris to provide asctime_r and ctime_r 5256 5257 A usno1998 file (substantially identical to usno1997) has been added. 5258 5259 5260 Release 1998d - 1998-05-14 11:58:34 -0400 5261 5262 changes to comments (in particular, elimination of references to CIA maps). 5263 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 5264 where changes occur. 5265 5266 5267 Release 1998c - 1998-02-28 12:32:26 -0500 5268 5269 changes by Paul Eggert (save the "French correction," on which I'll 5270 wait for the dust to settle) 5271 5272 symlink changes 5273 5274 changes and additions to Arts.htm 5275 5276 5277 Release 1998b - 1998-01-17 14:31:51 -0500 5278 5279 URL cleanups and additions 5280 5281 5282 Release 1998a - 1998-01-13 12:37:35 -0500 5283 5284 changes by Paul Eggert 5285 5286 5287 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 5288 5289 changes by Paul Eggert, with minor modifications from Arthur David 5290 Olson to make the files more browser friendly 5291 5292 5293 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 5294 5295 minor changes to put "TZif" at the start of each timezone information file 5296 5297 a rule has also been added to the Makefile so you can 5298 make zones 5299 to just recompile the zone information files (rather than doing a 5300 full "make install" with its other effects). 5301 5302 5303 Release data1997i - 1997-10-07 08:45:38 -0400 5304 5305 changes to Africa by Paul Eggert 5306 5307 5308 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 5309 5310 corrections for Uruguay (and other locations) 5311 5312 Arthur David Olson's simple-minded fix allowing mktime to both 5313 correctly handle leap seconds and correctly handle tm_sec values 5314 upon which arithmetic has been performed. 5315 5316 5317 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 5318 5319 Paul Eggert's updates 5320 5321 a small change to a function prototype; 5322 5323 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 5324 include information on Around the World in Eighty Days. 5325 5326 5327 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 5328 5329 fixes to zic's error handling 5330 5331 changes inspired by the item circulated on Slovenia 5332 5333 The description of Web resources has been HTMLified for browsing 5334 convenience. 5335 5336 A new piece of tz-related music has been added to the "Music" file. 5337 5338 5339 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 5340 5341 Paul Eggert's latest suggestions 5342 5343 5344 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 5345 5346 changes to "zic.c" to correct performance of the "-s" option 5347 5348 a new file "usno1997" 5349 5350 5351 Release data1997c - 1997-03-04 09:58:18 -0500 5352 5353 changes in Israel 5354 5355 5356 Release 1997b - 1997-02-27 18:34:19 -0500 5357 5358 The data file incorporates the 1997 leap second. 5359 5360 The code file incorporates Arthur David Olson's take on the 5361 zic/multiprocessor/directory-creation situation. 5362 5363 5364 Release 1997a - 1997-01-21 09:11:10 -0500 5365 5366 Paul Eggert's Antarctica (and other changes) 5367 5368 Arthur David Olson finessed the "getopt" issue by checking against 5369 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 5370 is returned while SunOS 5.5's manual says EOF is returned). 5371 5372 5373 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 5374 5375 Paul Eggert's latest changes 5376 5377 5378 Release code1996n - 1996-12-16 09:42:02 -0500 5379 5380 link snapping fix from Bruce Evans (via Garrett Wollman) 5381 5382 5383 Release data1996m - 1996-11-24 02:37:34 -0000 5384 [tzdata1996m.tar.gz is missing!] 5385 5386 Paul Eggert's batch of changes 5387 5388 5389 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 5390 5391 No functional changes here; the files have simply been changed to 5392 make more use of ISO style dates in comments. The names of the above 5393 files now include the year in full. 5394 5395 5396 Release code96l - 1996-09-08 17:12:20 -0400 5397 5398 tzcode96k was missing a couple of pieces. 5399 5400 5401 Release 96k - 1996-09-08 16:06:22 -0400 5402 5403 the latest round of changes from Paul Eggert 5404 5405 the recent Year 2000 material 5406 5407 5408 Release code96j - 1996-07-30 13:18:53 -0400 5409 5410 Set sp->typecnt as suggested by Timothy Patrick Murphy. 5411 5412 5413 Release code96i - 1996-07-27 20:11:35 -0400 5414 5415 Paul's suggested patch for strftime %V week numbers 5416 5417 5418 Release data96i - 1996-07-01 18:13:04 -0400 5419 5420 "northamerica" and "europe" changes by Paul Eggert 5421 5422 5423 Release code96h - 1996-06-05 08:02:21 -0400 5424 5425 fix for handling transitions specified in Universal Time 5426 5427 Some "public domain" notices have also been added. 5428 5429 5430 Release code96g - 1996-05-16 14:00:26 -0400 5431 5432 fix for the simultaneous-DST-and-zone-change challenge 5433 5434 5435 Release data96h - 1996-05-09 17:40:51 -0400 5436 5437 changes by Paul Eggert 5438 5439 5440 Release code96f-data96g - 1996-05-03 03:09:59 -0000 5441 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 5442 5443 The changes get us some of the way to fixing the problems noted in Paul 5444 Eggert's letter yesterday (in addition to a few others). The approach 5445 has been to make zic a bit smarter about figuring out what time zone 5446 abbreviations apply just after the time specified in the "UNTIL" part 5447 of a zone line. Putting the smarts in zic means avoiding having 5448 transition times show up in both "Zone" lines and "Rule" lines, which 5449 in turn avoids multiple transition time entries in time zone files. 5450 (This also makes the zic input files such as "europe" a bit shorter and 5451 should ease maintenance.) 5452 5453 5454 Release data96f - 1996-04-19 19:20:03 -0000 5455 [tzdata96f.tar.gz is missing!] 5456 5457 The only changes are to the "northamerica" file; the time zone 5458 abbreviation for Denver is corrected to MST (and MDT), and the 5459 comments for Mexico have been updated. 5460 5461 5462 Release data96e - 1996-03-19 17:37:26 -0500 5463 5464 Proposals by Paul Eggert, in particular the Portugal change that 5465 comes into play at the end of this month. 5466 5467 5468 Release data96d - 1996-03-18 20:49:39 -0500 5469 5470 [not summarized] 5471 5472 5473 Release code96e - 1996-02-29 15:43:27 -0000 5474 [tzcode96e.tar.gz is missing!] 5475 5476 internationalization changes and the fix to the documentation for strftime 5477 5478 5479 Release code96d-data96c - 1996-02-12 11:05:27 -0500 5480 5481 The "code" file simply updates Bob Kridle's electronic address. 5482 5483 The "data" file updates rules for Mexico. 5484 5485 5486 Release data96b - 1996-01-27 15:44:42 -0500 5487 5488 Kiribati change 5489 5490 5491 Release code96c - 1996-01-16 16:58:15 -0500 5492 5493 leap-year streamlining and binary-search changes 5494 5495 fix to newctime.3 5496 5497 5498 Release code96b - 1996-01-10 20:42:39 -0500 5499 5500 fixes and enhancements from Paul Eggert, including code that 5501 emulates the behavior of recent versions of the SunOS "date" 5502 command. 5503 5504 5505 Release 96a - 1996-01-06 09:08:24 -0500 5506 5507 Israel updates 5508 5509 fixes to strftime.c for correct ISO 8601 week number generation, 5510 plus support for two new formats ('G' and 'g') to give ISO 8601 year 5511 numbers (which are not necessarily the same as calendar year numbers) 5512 5513 5514 Release code95i-data95m - 1995-12-21 12:46:47 -0500 5515 5516 The latest revisions from Paul Eggert are included, the usno1995 5517 file has been updated, and a new file ("WWW") covering useful URLs 5518 has been added. 5519 5520 5521 Release code95h-data95l - 1995-12-19 18:10:12 -0500 5522 5523 A simplification of a macro definition, a change to data for Sudan, 5524 and (for last minute shoppers) notes in the "Music" file on the CD 5525 "Old Man Time". 5526 5527 5528 Release code95g-data95k - 1995-10-30 10:32:47 -0500 5529 5530 (slightly reformatted) 8-bit-clean proposed patch 5531 5532 minor patch: US/Eastern -> America/New_York 5533 5534 snapshot of the USNO's latest data ("usno1995") 5535 5536 some other minor cleanups 5537 5538 5539 Release code95f-data95j - 1995-10-28 21:01:34 -0000 5540 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 5541 5542 European cleanups 5543 5544 support for 64-bit time_t's 5545 5546 optimization in localtime.c 5547 5548 5549 Release code95e - 1995-10-13 13:23:57 -0400 5550 5551 the mktime change to scan from future to past when trying to find time zone 5552 offsets 5553 5554 5555 Release data95i - 1995-09-26 10:43:26 -0400 5556 5557 For Canada/Central, guess that the Sun customer's "one week too 5558 early" was just a approximation, and the true error is one month 5559 too early. This is consistent with the rest of Canada. 5560 5561 5562 Release data95h - 1995-09-21 11:26:48 -0400 5563 5564 latest changes from Paul Eggert 5565 5566 5567 Release code95d - 1995-09-14 11:14:45 -0400 5568 5569 the addition of a "Music" file, which documents four recorded 5570 versions of the tune "Save That Time". 5571 5572 5573 Release data95g - 1995-09-01 17:21:36 -0400 5574 5575 "yearistype" correction 5576 5577 5578 Release data95f - 1995-08-28 20:46:56 -0400 5579 5580 Paul Eggert's change to the australasia file 5581 5582 5583 Release data95e - 1995-07-08 18:02:34 -0400 5584 5585 The only change is a leap second at the end of this year. 5586 Thanks to Bradley White for forwarding news on the leap second. 5587 5588 5589 Release data95d - 1995-07-03 13:26:22 -0400 5590 5591 Paul Eggert's changes 5592 5593 5594 Release data95c - 1995-07-02 19:19:28 -0400 5595 5596 changes to "asia", "backward", "europe", and "southamerica" 5597 (read: northamericacentrics need not apply) 5598 5599 5600 Release code95c - 1995-03-13 14:00:46 -0500 5601 5602 one-line fix for sign extension problems in detzcode 5603 5604 5605 Release 95b - 1995-03-04 11:22:38 -0500 5606 5607 Minor changes in both: 5608 5609 The "code" file contains a workaround for the lack of "unistd.h" in 5610 Microsoft C++ version 7. 5611 5612 The "data" file contains a fixed "Link" for America/Shiprock. 5613 5614 5615 Release 94h - 1994-12-10 12:51:14 -0500 5616 5617 The files: 5618 5619 * incorporate the changes to "zdump" and "date" to make changes to 5620 the "TZ" environment variable permanent; 5621 5622 * incorporate the table changes by Paul Eggert; 5623 5624 * include (and document) support for universal time specifications in 5625 data files - but do not (yet) include use of this feature in the 5626 data files. 5627 5628 Think of this as "TZ Classic" - the software has been set up not to break if 5629 universal time shows up in its input, and data entries have been 5630 left as is so as not to break existing implementations. 5631 5632 5633 Release data94f - 1994-08-20 12:56:09 -0400 5634 5635 (with thanks!) the latest data updates from Paul Eggert 5636 5637 5638 Release data94e - 1994-06-04 13:13:53 -0400 5639 5640 [not summarized] 5641 5642 5643 Release code94g - 1994-05-05 12:14:07 -0400 5644 5645 fix missing "optind.c" and a reference to it in the Makefile 5646 5647 5648 Release code94f - 1994-05-05 13:00:33 -0000 5649 [tzcode94f.tar.gz is missing!] 5650 5651 changes to avoid overflow in difftime, as well as changes to cope 5652 with the 52/53 challenge in strftime 5653 5654 5655 Release code94e - 1994-03-30 23:32:59 -0500 5656 5657 change for the benefit of PCTS 5658 5659 5660 Release 94d - 1994-02-24 15:42:25 -0500 5661 5662 Avoid clashes with POSIX semantics for zones such as GMT+4. 5663 5664 Some other very minor housekeeping is also present. 5665 5666 5667 Release code94c - 1994-02-10 08:52:40 -0500 5668 5669 Fix bug where mkdirs was broken unless you compile with 5670 -fwritable-strings (which is generally losing to do). 5671 5672 5673 Release 94b - 1994-02-07 10:04:33 -0500 5674 5675 work by Paul Eggert who notes: 5676 5677 I found another book of time zone histories by E W Whitman; it's not 5678 as extensive as Shanks but has a few goodies of its own. I used it 5679 to update the tables. I also fixed some more as a result of 5680 correspondence with Adam David and Peter Ilieve, and move some stray 5681 links from 'europe' to 'backward'. I corrected some scanning errors 5682 in usno1989. 5683 5684 As far as the code goes, I fixed zic to allow years in the range 5685 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 5686 And I cleaned up the zic documentation a little bit. 5687 5688 5689 Release data94a - 1994-02-03 08:58:54 -0500 5690 5691 It simply incorporates the recently announced leap second into the 5692 "leapseconds" file. 5693 5694 5695 Release 93g - 1993-11-22 17:28:27 -0500 5696 5697 Paul Eggert has provided a good deal of historic information (based 5698 on Shanks), and there are some code changes to deal with the buglets 5699 that crawled out in dealing with the new information. 5700 5701 5702 Release 93f - 1993-10-15 12:27:46 -0400 5703 5704 Paul Eggert's changes 5705 5706 5707 Release 93e - 1993-09-05 21:21:44 -0400 5708 5709 This has updated data for Israel, England, and Kwajalein. There's 5710 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 5711 Thanks to Paul Eggert and Peter Ilieve for the changes. 5712 5713 5714 Release 93d - 1993-06-17 23:34:17 -0400 5715 5716 new fix and new data on Israel 5717 5718 5719 Release 93c - 1993-06-06 19:31:55 -0400 5720 5721 [not summarized] 5722 5723 5724 Release 93b - 1993-02-02 14:53:58 -0500 5725 5726 updated "leapseconds" file 5727 5728 5729 Release 93 - 1993-01-08 07:01:06 -0500 5730 5731 At kre's suggestion, the package has been split in two - a code piece 5732 (which also includes documentation) that's only of use to folks who 5733 want to recompile things and a data piece useful to anyone who can 5734 run "zic". 5735 5736 The new version has a few changes to the data files, a few 5737 portability changes, and an off-by-one fix (with thanks to 5738 Tom Karzes at deshaw.com for providing a description and a 5739 solution). 5740 5741 5742 Release 92c - 1992-11-21 17:35:36 -0000 5743 [tz92c.tar.Z is missing!] 5744 5745 The fallout from the latest round of DST transitions. 5746 5747 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 5748 there's also a change to "zic.c" that makes it portable to more systems. 5749 5750 5751 Release 92 - 1992-04-25 18:17:03 -0000 5752 [tz92.tar.Z is missing!] 5753 5754 By popular demand (well, at any rate, following a request by kre at munnari) 5755 5756 5757 The 1989 update of the time zone package featured: 5758 5759 * POSIXization (including interpretation of POSIX-style TZ environment 5760 variables, provided by Guy Harris), 5761 * ANSIfication (including versions of "mktime" and "difftime"), 5762 * SVIDulation (an "altzone" variable) 5763 * MACHination (the "gtime" function) 5764 * corrections to some time zone data (including corrections to the rules 5765 for Great Britain and New Zealand) 5766 * reference data from the United States Naval Observatory for folks who 5767 want to do additional time zones 5768 * and the 1989 data for Saudi Arabia. 5769 5770 (Since this code will be treated as "part of the implementation" in some 5771 places and as "part of the application" in others, there's no good way to 5772 name functions, such as timegm, that are not part of the proposed ANSI C 5773 standard; such functions have kept their old, underscore-free names in this 5774 update.) 5775 5776 And the "dysize" function has disappeared; it was present to allow 5777 compilation of the "date" command on old BSD systems, and a version of "date" 5778 is now provided in the package. The "date" command is not created when you 5779 "make all" since it may lack options provided by the version distributed with 5780 your operating system, or may not interact with the system in the same way 5781 the native version does. 5782 5783 Since POSIX frowns on correct leap second handling, the default behavior of 5784 the "zic" command (in the absence of a "-L" option) has been changed to omit 5785 leap second information from its output files. 5786 5787 5788 ----- 5789 Notes 5790 5791 This file contains copies of the part of each release announcement 5792 that talks about the changes in that release. The text has been 5793 adapted and reformatted for the purposes of this file. 5794 5795 Traditionally a release R consists of a pair of tarball files, 5796 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 5797 code2010a, data2012c) consist of just one or the other tarball, and a 5798 few (e.g., code2012c-data2012d) have tarballs with mixed version 5799 numbers. Recent releases also come in an experimental format 5800 consisting of a single tarball tzdb-R.tar.lz with extra data. 5801 5802 Release timestamps are taken from the release's commit (for newer, 5803 Git-based releases), from the newest file in the tarball (for older 5804 releases, where this info is available) or from the email announcing 5805 the release (if all else fails; these are marked with a time zone 5806 abbreviation of -0000 and an "is missing!" comment). 5807 5808 Earlier versions of the code and data were not announced on the tz 5809 list and are not summarized here. 5810 5811 This file is in the public domain. 5812 5813 Local Variables: 5814 coding: utf-8 5815 End: 5816
Indexes created Tue Sep 30 20:09:53 GMT 2025