NEWS revision 1.43
1 News for the tz database 2 3 Release 2023d - 2023-12-21 20:02:24 -0800 4 5 Briefly: 6 Ittoqqortoormiit, Greenland changes time zones on 2024-03-31. 7 Vostok, Antarctica changed time zones on 2023-12-18. 8 Casey, Antarctica changed time zones five times since 2020. 9 Code and data fixes for Palestine timestamps starting in 2072. 10 A new data file zonenow.tab for timestamps starting now. 11 12 Changes to future timestamps 13 14 Ittoqqortoormiit, Greenland (America/Scoresbysund) joins most of 15 the rest of Greenland's timekeeping practice on 2024-03-31, by 16 changing its time zone from -01/+00 to -02/-01 at the same moment 17 as the spring-forward transition. Its clocks will therefore not 18 spring forward as previously scheduled. The time zone change 19 reverts to its common practice before 1981. 20 21 Fix predictions for DST transitions in Palestine in 2072-2075, 22 correcting a typo introduced in 2023a. 23 24 Changes to past and future timestamps 25 26 Vostok, Antarctica changed to +05 on 2023-12-18. It had been at 27 +07 (not +06) for years. (Thanks to Zakhary V. Akulov.) 28 29 Change data for Casey, Antarctica to agree with timeanddate.com, 30 by adding five time zone changes since 2020. Casey is now at +08 31 instead of +11. 32 33 Changes to past tm_isdst flags 34 35 Much of Greenland, represented by America/Nuuk, changed its 36 standard time from -03 to -02 on 2023-03-25, not on 2023-10-28. 37 This does not affect UTC offsets, only the tm_isdst flag. 38 (Thanks to Thomas M. Steenholdt.) 39 40 New data file 41 42 A new data file zonenow.tab helps configure applications that use 43 timestamps dated from now on. This simplifies configuration, 44 since users choose from a smaller Zone set. The file's format is 45 experimental and subject to change. 46 47 Changes to code 48 49 localtime.c no longer mishandles TZif files that contain a single 50 transition into a DST regime. Previously, it incorrectly assumed 51 DST was in effect before the transition too. (Thanks to Alois 52 Treindl for debugging help.) 53 54 localtime.c's timeoff no longer collides with OpenBSD 7.4. 55 56 The C code now uses _Generic only if __STDC_VERSION__ says the 57 compiler is C11 or later. 58 59 tzselect now optionally reads zonenow.tab, to simplify when 60 configuring only for timestamps dated from now on. 61 62 tzselect no longer creates temporary files. 63 64 tzselect no longer mishandles the following: 65 66 Spaces and most other special characters in BUGEMAIL, PACKAGE, 67 TZDIR, and VERSION. 68 69 TZ strings when using mawk 1.4.3, which mishandles regular 70 expressions of the form /X{2,}/. 71 72 ISO 6709 coordinates when using an awk that lacks the GNU 73 extension of newlines in -v option-arguments. 74 75 Non UTF-8 locales when using an iconv command that lacks the GNU 76 //TRANSLIT extension. 77 78 zic no longer mishandles data for Palestine after the year 2075. 79 Previously, it incorrectly omitted post-2075 transitions that are 80 predicted for just before and just after Ramadan. (Thanks to Ken 81 Murchison for debugging help.) 82 83 zic now works again on Linux 2.6.16 and 2.6.17 (2006). 84 (Problem reported by Rune Torgersen.) 85 86 Changes to build procedure 87 88 The Makefile is now more compatible with POSIX: 89 * It no longer defines AR, CC, CFLAGS, LDFLAGS, and SHELL. 90 * It no longer uses its own 'cc' in place of CC. 91 * It now uses ARFLAGS, with default specified by POSIX. 92 * It does not use LFLAGS incompatibly with POSIX. 93 * It uses the special .POSIX target. 94 * It quotes special characters more carefully. 95 * It no longer mishandles builds in an ISO 8859 locale. 96 Due to the CC changes, TZDIR is now #defined in a file tzfile.h 97 built by 'make', not in a $(CC) -D option. Also, TZDEFAULT is 98 now treated like TZDIR as they have similar roles. 99 100 Changes to commentary 101 102 Limitations and hazards of the optional support for obsolescent 103 C89 platforms are documented better, along with a tentative 104 schedule for removing this support. 105 106 107 Release 2023c - 2023-03-28 12:42:14 -0700 108 109 Changes to past and future timestamps 110 111 Model Lebanon's DST chaos by reverting data to tzdb 2023a. 112 (Thanks to Rany Hany for the heads-up.) 113 114 115 Release 2023b - 2023-03-23 19:50:38 -0700 116 117 Changes to future timestamps 118 119 This year Lebanon springs forward April 20/21 not March 25/26. 120 (Thanks to Saadallah Itani.) [This was reverted in 2023c.] 121 122 123 Release 2023a - 2023-03-22 12:39:33 -0700 124 125 Briefly: 126 Egypt now uses DST again, from April through October. 127 This year Morocco springs forward April 23, not April 30. 128 Palestine delays the start of DST this year. 129 Much of Greenland still uses DST from 2024 on. 130 America/Yellowknife now links to America/Edmonton. 131 tzselect can now use current time to help infer timezone. 132 The code now defaults to C99 or later. 133 Fix use of C23 attributes. 134 135 Changes to future timestamps 136 137 Starting in 2023, Egypt will observe DST from April's last Friday 138 through October's last Thursday. (Thanks to Ahmad ElDardiry.) 139 Assume the transition times are 00:00 and 24:00, respectively. 140 141 In 2023 Morocco's spring-forward transition after Ramadan 142 will occur April 23, not April 30. (Thanks to Milamber.) 143 Adjust predictions for future years accordingly. This affects 144 predictions for 2023, 2031, 2038, and later years. 145 146 This year Palestine will delay its spring forward from 147 March 25 to April 29 due to Ramadan. (Thanks to Heba Hamad.) 148 Make guesses for future Ramadans too. 149 150 Much of Greenland, represented by America/Nuuk, will continue to 151 observe DST using European Union rules. When combined with 152 Greenland's decision not to change the clocks in fall 2023, 153 America/Nuuk therefore changes from -03/-02 to -02/-01 effective 154 2023-10-29 at 01:00 UTC. (Thanks to Thomas M. Steenholdt.) 155 This change from 2022g doesn't affect timestamps until 2024-03-30, 156 and doesn't affect tm_isdst until 2023-03-25. 157 158 Changes to past timestamps 159 160 America/Yellowknife has changed from a Zone to a backward 161 compatibility Link, as it no longer differs from America/Edmonton 162 since 1970. (Thanks to Almaz Mingaleev.) This affects some 163 pre-1948 timestamps. The old data are now in 'backzone'. 164 165 Changes to past time zone abbreviations 166 167 When observing Moscow time, Europe/Kirov and Europe/Volgograd now 168 use the abbreviations MSK/MSD instead of numeric abbreviations, 169 for consistency with other timezones observing Moscow time. 170 171 Changes to code 172 173 You can now tell tzselect local time, to simplify later choices. 174 Select the 'time' option in its first prompt. 175 176 You can now compile with -DTZNAME_MAXIMUM=N to limit time zone 177 abbreviations to N bytes (default 255). The reference runtime 178 library now rejects POSIX-style TZ strings that contain longer 179 abbreviations, treating them as UTC. Previously the limit was 180 platform dependent and abbreviations were silently truncated to 181 16 bytes even when the limit was greater than 16. 182 183 The code by default is now designed for C99 or later. To build on 184 a mostly-C89 platform, compile with -DPORT_TO_C89; this should 185 work on C89 platforms that also support C99 'long long' and 186 perhaps a few other extensions to C89. To support C89 callers of 187 tzcode's library, compile with -DSUPPORT_C89; however, this could 188 trigger latent bugs in C99-or-later callers. The two new macros 189 are transitional aids planned to be removed in a future version 190 (say, in 2029), when C99 or later will be required. 191 192 The code now builds again on pre-C99 platforms, if you compile 193 with -DPORT_TO_C89. This fixes a bug introduced in 2022f. 194 195 On C23-compatible platforms tzcode no longer uses syntax like 196 'static [[noreturn]] void usage(void);'. Instead, it uses 197 '[[noreturn]] static void usage(void);' as strict C23 requires. 198 (Problem reported by Houge Langley.) 199 200 The code's functions now constrain their arguments with the C 201 'restrict' keyword consistently with their documentation. 202 This may allow future optimizations. 203 204 zdump again builds standalone with ckdadd and without setenv, 205 fixing a bug introduced in 2022g. (Problem reported by panic.) 206 207 leapseconds.awk can now process a leap seconds file that never 208 expires; this might be useful if leap seconds are discontinued. 209 210 Changes to commentary 211 212 tz-link.html has a new section "Coordinating with governments and 213 distributors". (Thanks to Neil Fuller for some of the text.) 214 215 To improve tzselect diagnostics, zone1970.tab's comments column is 216 now limited to countries that have multiple timezones. 217 218 Note that leap seconds are planned to be discontinued by 2035. 219 220 221 Release 2022g - 2022-11-29 08:58:31 -0800 222 223 Briefly: 224 The northern edge of Chihuahua changes to US timekeeping. 225 Much of Greenland stops changing clocks after March 2023. 226 Fix some pre-1996 timestamps in northern Canada. 227 C89 is now deprecated; please use C99 or later. 228 Portability fixes for AIX, libintl, MS-Windows, musl, z/OS 229 In C code, use more C23 features if available. 230 C23 timegm now supported by default 231 Fixes for unlikely integer overflows 232 233 Changes to future timestamps 234 235 In the Mexican state of Chihuahua, the border strip near the US 236 will change to agree with nearby US locations on 2022-11-30. 237 The strip's western part, represented by Ciudad Jurez, switches 238 from -06 all year to -07/-06 with US DST rules, like El Paso, TX. 239 The eastern part, represented by Ojinaga, will observe US DST next 240 year, like Presidio, TX. (Thanks to Heitor David Pinto.) 241 A new Zone America/Ciudad_Juarez splits from America/Ojinaga. 242 243 Much of Greenland, represented by America/Nuuk, stops observing 244 winter time after March 2023, so its daylight saving time becomes 245 standard time. (Thanks to Jonas Nyrup and Jrgen Appel.) 246 247 Changes to past timestamps 248 249 Changes for pre-1996 northern Canada (thanks to Chris Walton): 250 251 Merge America/Iqaluit and America/Pangnirtung into the former, 252 with a backward compatibility link for the latter name. 253 There is no good evidence the two locations differ since 1970. 254 This change affects pre-1996 America/Pangnirtung timestamps. 255 256 Cambridge Bay, Inuvik, Iqaluit, Rankin Inlet, Resolute and 257 Yellowknife did not observe DST in 1965, and did observe DST 258 from 1972 through 1979. 259 260 Whitehorse moved from -09 to -08 on 1966-02-27, not 1967-05-28. 261 262 Colombia's 1993 fallback was 02-06 24:00, not 04-04 00:00. 263 (Thanks to Alois Treindl.) 264 265 Singapore's 1981-12-31 change was at 16:00 UTC (23:30 local time), 266 not 24:00 local time. (Thanks to Geoff Clare via Robert Elz.) 267 268 Changes to code 269 270 Although tzcode still works with C89, bugs found in recent routine 271 maintenance indicate that bitrot has set in and that in practice 272 C89 is no longer used to build tzcode. As it is a maintenance 273 burden, support for C89 is planned to be removed soon. Instead, 274 please use compilers compatible with C99, C11, C17, or C23. 275 276 timegm, which tzcode implemented in 1989, will finally be 277 standardized 34 years later as part of C23, so timegm is now 278 supported even if STD_INSPIRED is not defined. 279 280 Fix bug in zdump's tzalloc emulation on hosts that lack tm_zone. 281 (Problem reported by on Trn Cng Danh.) 282 283 Fix bug in zic on hosts where malloc(0) yields NULL on success. 284 (Problem reported by Tim McBrayer for AIX 6.1.) 285 286 Fix zic configuration to avoid linkage failures on some platforms. 287 (Problems reported by Gilmore Davidson and Igor Ivanov.) 288 289 Work around MS-Windows nmake incompatibility with POSIX. 290 (Problem reported by Manuela Friedrich.) 291 292 Port mktime and strftime to debugging platforms where accessing 293 uninitialized data has undefined behavior (strftime problem 294 reported by Robert Elz). 295 296 Check more carefully for unlikely integer overflows, preferring 297 C23 <stdckdint.h> to overflow checking by hand, as the latter has 298 had obscure bugs. 299 300 Changes to build procedure 301 302 New Makefile rule check_mild that skips checking whether Link 303 lines are in the file 'backward'. (Inspired by a suggestion from 304 Stephen Colebourne.) 305 306 On C23-compatible platforms tzcode no longer uses syntax like 307 'static [[noreturn]] void usage(void);'. Instead, it uses 308 '[[noreturn]] static void usage(void);' as strict C23 requires. 309 (Problem reported by Houge Langley.) 310 311 312 Release 2022f - 2022-10-28 18:04:57 -0700 313 314 Briefly: 315 Mexico will no longer observe DST except near the US border. 316 Chihuahua moves to year-round -06 on 2022-10-30. 317 Fiji no longer observes DST. 318 Move links to 'backward'. 319 In vanguard form, GMT is now a Zone and Etc/GMT a link. 320 zic now supports links to links, and vanguard form uses this. 321 Simplify four Ontario zones. 322 Fix a Y2438 bug when reading TZif data. 323 Enable 64-bit time_t on 32-bit glibc platforms. 324 Omit large-file support when no longer needed. 325 In C code, use some C23 features if available. 326 Remove no-longer-needed workaround for Qt bug 53071. 327 328 Changes to future timestamps 329 330 Mexico will no longer observe DST after 2022, except for areas 331 near the US border that continue to observe US DST rules. 332 On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves 333 from -07 (-06 with DST) to year-round -06, thus not changing 334 its clocks that day. The new law states that Chihuahua 335 near the US border no longer observes US DST. 336 (Thanks to gera for the heads-up about Chihuahua.) 337 338 Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.) 339 For now, assume DST is suspended indefinitely. 340 341 Changes to data 342 343 Move links to 'backward' to ease and simplify link maintenance. 344 This affects generated data only if you use 'make BACKWARD='. 345 346 GMT is now a Zone and Etc/GMT a link instead of vice versa, 347 as GMT is needed for leap second support whereas Etc/GMT is not. 348 However, this change exposes a bug in TZUpdater 2.3.2 so it is 349 present only in vanguard form for now. 350 351 Vanguard form now uses links to links, as zic now supports this. 352 353 Changes to past timestamps 354 355 Simplify four Ontario zones, as most of the post-1970 differences 356 seem to have been imaginary. (Problem reported by Chris Walton.) 357 Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay 358 to 'backzone'; backward-compatibility links still work, albeit 359 with some different timestamps before November 2005. 360 361 Changes to code 362 363 zic now supports links to links regardless of input line order. 364 For example, if Australia/Sydney is a Zone, the lines 365 Link Australia/Canberra Australia/ACT 366 Link Australia/Sydney Australia/Canberra 367 now work correctly, even though the shell commands 368 ln Australia/Canberra Australia/ACT 369 ln Australia/Sydney Australia/Canberra 370 would fail because the first command attempts to use a link 371 Australia/Canberra that does not exist until after the second 372 command is executed. Previously, zic had unspecified behavior if 373 a Link line's target was another link, and zic often misbehaved if 374 a Link line's target was a later Link line. 375 376 Fix line number in zic's diagnostic for a link to a link. 377 378 Fix a bug that caused localtime to mishandle timestamps starting 379 in the year 2438 when reading data generated by 'zic -b fat' when 380 distant-future DST transitions occur at times given in standard 381 time or in UT, not the usual case of local time. This occurs when 382 the corresponding .zi Rule lines specify DST transitions with TO 383 columns of 'max' and AT columns that end in 's' or 'u'. The 384 number 2438 comes from the 32-bit limit in the year 2038, plus the 385 400-year Gregorian cycle. (Problem reported by Bradley White.) 386 387 On glibc 2.34 and later, which optionally supports 64-bit time_t 388 on platforms like x86 where time_t was traditionally 32 bits, 389 default time_t to 64 instead of 32 bits. This lets functions like 390 localtime support timestamps after the year 2038, and fixes 391 year-2038 problems in zic when accessing files dated after 2038. 392 To continue to limit time_t to 32 bits on these platforms, use 393 "make CFLAGS='-D_TIME_BITS=32'". 394 395 In C code, do not enable large-file support on platforms like AIX 396 and macOS that no longer need it now that tzcode does not use 397 off_t or related functions like 'stat'. Large-file support is 398 still enabled by default on GNU/Linux, as it is needed for 64-bit 399 time_t support. 400 401 In C code, prefer C23 keywords to pre-C23 macros for alignof, 402 bool, false, and true. Also, use the following C23 features if 403 available: __has_include, unreachable. 404 405 zic no longer works around Qt bug 53071, as the relevant Qt 406 releases have been out of support since 2019. This change affects 407 only fat TZif files, as thin files never had the workaround. 408 409 zdump no longer modifies the environ vector when compiled on 410 platforms lacking tm_zone or when compiled with -DUSE_LTZ=0. 411 This avoid undefined behavior on POSIX platforms. 412 413 414 Release 2022e - 2022-10-11 11:13:02 -0700 415 416 Briefly: 417 Jordan and Syria switch from +02/+03 with DST to year-round +03. 418 419 Changes to future timestamps 420 421 Jordan and Syria are abandoning the DST regime and are changing to 422 permanent +03, so they will not fall back from +03 to +02 on 423 2022-10-28. (Thanks to Steffen Thorsen and Issam Al-Zuwairi.) 424 425 Changes to past timestamps 426 427 On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00. 428 429 Changes to past time zone abbreviations and DST flags 430 431 The temporary advancement of clocks in central Mexico in summer 432 1931 is now treated as daylight saving time, instead of as two 433 changes to standard time. 434 435 436 Release 2022d - 2022-09-23 12:02:57 -0700 437 438 Briefly: 439 Palestine transitions are now Saturdays at 02:00. 440 Simplify three Ukraine zones into one. 441 442 Changes to future timestamps 443 444 Palestine now springs forward and falls back at 02:00 on the 445 first Saturday on or after March 24 and October 24, respectively. 446 This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00. 447 (Thanks to Heba Hamad.) 448 449 Changes to past timestamps 450 451 Simplify three Ukraine zones to one, since the post-1970 452 differences seem to have been imaginary. Move Europe/Uzhgorod and 453 Europe/Zaporozhye to 'backzone'; backward-compatibility links 454 still work, albeit with different timestamps before October 1991. 455 456 457 Release 2022c - 2022-08-15 17:47:18 -0700 458 459 Briefly: 460 Work around awk bug in FreeBSD, macOS, etc. 461 Improve tzselect on intercontinental Zones. 462 463 Changes to code 464 465 Work around a bug in onetrueawk that broke commands like 466 'make traditional_tarballs' on FreeBSD, macOS, etc. 467 (Problem reported by Deborah Goldsmith.) 468 469 Add code to tzselect that uses experimental structured comments in 470 zone1970.tab to clarify whether Zones like Africa/Abidjan and 471 Europe/Istanbul cross continent or ocean boundaries. 472 (Inspired by a problem reported by Peter Krefting.) 473 474 Fix bug with 'zic -d /a/b/c' when /a is unwritable but the 475 directory /a/b already exists. 476 477 Remove zoneinfo2tdf.pl, as it was unused and triggered false 478 malware alarms on some email servers. 479 480 481 Release 2022b - 2022-08-10 15:38:32 -0700 482 483 Briefly: 484 Chile's DST is delayed by a week in September 2022. 485 Iran no longer observes DST after 2022. 486 Rename Europe/Kiev to Europe/Kyiv. 487 New zic -R option 488 Vanguard form now uses %z. 489 Finish moving duplicate-since-1970 zones to 'backzone'. 490 New build option PACKRATLIST 491 New tailored_tarballs target, replacing rearguard_tarballs 492 493 Changes to future timestamps 494 495 Chile's 2022 DST start is delayed from September 4 to September 11. 496 (Thanks to Juan Correa.) 497 498 Iran plans to stop observing DST permanently, after it falls back 499 on 2022-09-21. (Thanks to Ali Mirjamali.) 500 501 Changes to past timestamps 502 503 Finish moving to 'backzone' the location-based zones whose 504 timestamps since 1970 are duplicates; adjust links accordingly. 505 This change ordinarily affects only pre-1970 timestamps, and with 506 the new PACKRATLIST option it does not affect any timestamps. 507 In this round the affected zones are Antarctica/Vostok, 508 Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, 509 Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, 510 Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, 511 Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, 512 Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, 513 Pacific/Wake and Pacific/Wallis, and the affected links are 514 Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, 515 Pacific/Truk, and Pacific/Yap. 516 517 From fall 1994 through fall 1995, Shanks wrote that Crimea's 518 DST transitions were at 02:00 standard time, not at 00:00. 519 (Thanks to Michael Deckers.) 520 521 Iran adopted standard time in 1935, not 1946. In 1977 it observed 522 DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 523 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 524 transition was on 05-27, not 03-21. 525 (Thanks to Roozbeh Pournader and Francis Santoni.) 526 527 Chile's observance of -04 from 1946-08-29 through 1947-03-31 was 528 considered DST, not standard time. Santiago and environs had moved 529 their clocks back to rejoin the rest of mainland Chile; put this 530 change at the end of 1946-08-28. (Thanks to Michael Deckers.) 531 532 Some old, small clock transitions have been removed, as people at 533 the time did not change their clocks. This affects Asia/Hong_Kong 534 in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. 535 536 Changes to zone name 537 538 Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in 539 English now. Spelling of other names in Ukraine has not yet 540 demonstrably changed in common English practice so for now these 541 names retain old spellings, as in other countries (e.g., 542 Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). 543 544 Changes to code 545 546 zic has a new option '-R @N' to output explicit transitions < N. 547 (Need suggested by Almaz Mingaleev.) 548 549 'zic -r @N' no longer outputs bad data when N < first transition. 550 (Problem introduced in 2021d and reported by Peter Krefting.) 551 552 zic now checks its input for NUL bytes and unterminated lines, and 553 now supports input line lengths up to 2048 (not 512) bytes. 554 555 gmtime and related code now use the abbreviation "UTC" not "GMT". 556 POSIX is being revised to require this. 557 558 When tzset and related functions set vestigial static variables 559 like tzname, they now prefer specified timestamps to unspecified ones. 560 (Problem reported by Almaz Mingaleev.) 561 562 zic no longer complains "can't determine time zone abbreviation to 563 use just after until time" when a transition to a new standard 564 time occurs simultaneously with the first DST fallback transition. 565 566 Changes to build procedure 567 568 Source data in vanguard form now uses the %z notation, introduced 569 in release 2015f. For example, for America/Sao_Paulo vanguard 570 form contains the zone continuation line "-3:00 Brazil %z", which 571 is simpler and more reliable than the line "-3:00 Brazil -03/-02" 572 used in main and rearguard forms. The plan is for the main form 573 to use %z eventually; in the meantime maintainers of zi parsers 574 are encouraged to test the parsers on vanguard.zi. 575 576 The Makefile has a new PACKRATLIST option to select a subset of 577 'backzone'. For example, 'make PACKRATDATA=backzone 578 PACKRATLIST=zone.tab' now generates TZif files identical to those 579 of the global-tz project. 580 581 The Makefile has a new tailored_tarballs target for generating 582 special-purpose tarballs. It generalizes and replaces the 583 rearguard_tarballs target and related targets and macros, which 584 are now obsolescent. 585 586 'make install' now defaults LOCALTIME to Factory not GMT, 587 which means the default abbreviation is now "-00" not "GMT". 588 589 Remove the posix_packrat target, marked obsolescent in 2016a. 590 591 592 Release 2022a - 2022-03-15 23:02:01 -0700 593 594 Briefly: 595 Palestine will spring forward on 2022-03-27, not -03-26. 596 zdump -v now outputs better failure indications. 597 Bug fixes for code that reads corrupted TZif data. 598 599 Changes to future timestamps 600 601 Palestine will spring forward on 2022-03-27, not 2022-03-26. 602 (Thanks to Heba Hamad.) Predict future transitions for first 603 Sunday >= March 25. Additionally, predict fallbacks to be the first 604 Friday on or after October 23, not October's last Friday, to be more 605 consistent with recent practice. The first differing fallback 606 prediction is on 2025-10-24, not 2025-10-31. 607 608 Changes to past timestamps 609 610 From 1992 through spring 1996, Ukraine's DST transitions were at 611 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) 612 613 Chile's Santiago Mean Time and its LMT precursor have been adjusted 614 eastward by 1 second to align with past and present law. 615 616 Changes to commentary 617 618 Add several references for Chile's 1946/1947 transitions, some of 619 which only affected portions of the country. 620 621 Changes to code 622 623 Fix bug when mktime gets confused by truncated TZif files with 624 unspecified local time. (Problem reported by Almaz Mingaleev.) 625 626 Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. 627 (Problem reported by Christos Zoulas.) 628 629 When reading a version 2 or later TZif file, the TZif reader now 630 validates the version 1 header and data block only enough to skip 631 over them, as recommended by RFC 8536 section 4. Also, the TZif 632 reader no longer mistakenly attempts to parse a version 1 TZIf 633 file header as a TZ string. 634 635 zdump -v now outputs "(localtime failed)" and "(gmtime failed)" 636 when local time and UT cannot be determined for a timestamp. 637 638 Changes to build procedure 639 640 Distribution tarballs now use standard POSIX.1-1988 ustar format 641 instead of GNU format. Although the formats are almost identical 642 for these tarballs, ustar headers' magic fields contain "ustar" 643 instead of "ustar ", and their version fields contain "00" instead 644 of " ". The two formats are planned to diverge more significantly 645 for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar 646 format becomes obsolete and the tarballs switch to pax format, an 647 extension of ustar. For details about these formats, please see 648 "pax - portable archive interchange", IEEE Std 1003.1-2017, 649 <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>. 650 651 652 Release 2021e - 2021-10-21 18:41:00 -0700 653 654 Changes to future timestamps 655 656 Palestine will fall back 10-29 (not 10-30) at 01:00. 657 (Thanks to P Chan and Heba Hemad.) 658 659 660 Release 2021d - 2021-10-15 13:48:18 -0700 661 662 Briefly: 663 Fiji suspends DST for the 2021/2022 season. 664 'zic -r' marks unspecified timestamps with "-00". 665 666 Changes to future timestamps 667 668 Fiji will suspend observance of DST for the 2021/2022 season. 669 Assume for now that it will return next year. (Thanks to Jashneel 670 Kumar and P Chan.) 671 672 Changes to code 673 674 'zic -r' now uses "-00" time zone abbreviations for intervals 675 with UT offsets that are unspecified due to -r truncation. 676 This implements a change in draft Internet RFC 8536bis. 677 678 679 Release 2021c - 2021-10-01 14:21:49 -0700 680 681 Briefly: 682 Revert most 2021b changes to 'backward'. 683 Fix 'zic -b fat' bug in pre-1970 32-bit data. 684 Fix two Link line typos. 685 Distribute SECURITY file. 686 687 This release is intended as a bugfix release, to fix compatibility 688 problems and typos reported since 2021b was released. 689 690 Changes to Link directives 691 692 Revert almost all of 2021b's changes to the 'backward' file, 693 by moving Link directives back to where they were in 2021a. 694 Although 'zic' doesn't care which source file contains a Link 695 directive, some downstream uses ran into trouble with the move. 696 (Problem reported by Stephen Colebourne for Joda-Time.) 697 698 Fix typo that linked Atlantic/Jan_Mayen to the wrong location 699 (problem reported by Chris Walton). 700 701 Fix 'backzone' typo that linked America/Virgin to the wrong 702 location (problem reported by Michael Deckers). 703 704 Changes to code 705 706 Fix a bug in 'zic -b fat' that caused old timestamps to be 707 mishandled in 32-bit-only readers (problem reported by Daniel 708 Fischer). 709 710 Changes to documentation 711 712 Distribute the SECURITY file (problem reported by Andreas Radke). 713 714 715 Release 2021b - 2021-09-24 16:23:00 -0700 716 717 Briefly: 718 Jordan now starts DST on February's last Thursday. 719 Samoa no longer observes DST. 720 Merge more location-based Zones whose timestamps agree since 1970. 721 Move some backward-compatibility links to 'backward'. 722 Rename Pacific/Enderbury to Pacific/Kanton. 723 Correct many pre-1993 transitions in Malawi, Portugal, etc. 724 zic now creates each output file or link atomically. 725 zic -L no longer omits the POSIX TZ string in its output. 726 zic fixes for truncation and leap second table expiration. 727 zic now follows POSIX for TZ strings using all-year DST. 728 Fix some localtime crashes and bugs in obscure cases. 729 zdump -v now outputs more-useful boundary cases. 730 tzfile.5 better matches a draft successor to RFC 8536. 731 A new file SECURITY. 732 733 This release is prompted by recent announcements by Jordan and Samoa. 734 It incorporates many other changes that had accumulated since 2021a. 735 However, it omits most proposed changes that merged all Zones 736 agreeing since 1970, as concerns were raised about doing too many of 737 these changes at once. It does keeps some of these changes in the 738 interest of making tzdb more equitable one step at a time; see 739 "Merge more location-based Zones" below. 740 741 Changes to future timestamps 742 743 Jordan now starts DST on February's last Thursday. 744 (Thanks to Steffen Thorsen.) 745 746 Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) 747 748 Changes to zone name 749 750 Rename Pacific/Enderbury to Pacific/Kanton. When we added 751 Enderbury in 1993, we did not know that it is uninhabited and that 752 Kanton (population two dozen) is the only inhabited location in 753 that timezone. The old name is now a backward-compatibility link. 754 755 Changes to past timestamps 756 757 Correct many pre-1993 transitions, fixing entries originally 758 derived from Shanks, Whitman, and Mundell. The fixes include: 759 - Barbados: standard time was introduced in 1911, not 1932; and 760 DST was observed in 1942-1944 761 - Cook Islands: In 1899 they switched from east to west of GMT, 762 celebrating Christmas for two days. They (and Niue) switched 763 to standard time in 1952, not 1901. 764 - Guyana: corrected LMT for Georgetown; the introduction of 765 standard time in 1911, not 1915; and corrections to 1975 and 766 1992 transitions 767 - Kanton: uninhabited before 1937-08-31 768 - Niue: only observed -11:20 from 1952 through 1964, then went to 769 -11 instead of -11:30 770 - Portugal: DST was observed in 1950 771 - Tonga: corrected LMT; the introduction of standard time in 1945, 772 not 1901; and corrections to the transition from +12:20 to +13 773 in 1961, not 1941 774 Additional fixes to entries in the 'backzone' file include: 775 - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 776 - The Gambia: 1933 and 1942 transitions 777 - Malawi: several 1911 through 1925 transitions 778 - Sierra Leone: several 1913 through 1941 transitions, and DST 779 was NOT observed in 1957 through 1962 780 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and 781 Alois Treindl.) 782 783 Merge more location-based Zones whose timestamps agree since 1970, 784 as pre-1970 timestamps are out of scope. This is part of a 785 process that has been ongoing since 2013. This does not affect 786 post-1970 timestamps, and timezone historians who build with 'make 787 PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. 788 When merging, keep the most-populous location's data, and move 789 data for other locations to 'backzone' with a backward 790 link in 'backward'. For example, move America/Creston data to 791 'backzone' with a link in 'backward' from America/Phoenix because 792 the two timezones' timestamps agree since 1970; this change 793 affects some pre-1968 timestamps in America/Creston because 794 Creston and Phoenix disagreed before 1968. The affected Zones 795 are Africa/Accra, America/Atikokan, America/Blanc-Sablon, 796 America/Creston, America/Curacao, America/Nassau, 797 America/Port_of_Spain, Antarctica/DumontDUrville, and 798 Antarctica/Syowa. 799 800 Changes to maintenance procedure 801 802 The new file SECURITY covers how to report security-related bugs. 803 804 Several backward-compatibility links have been moved to the 805 'backward' file. These links, which range from Africa/Addis_Ababa 806 to Pacific/Saipan, are only for compatibility with now-obsolete 807 guidelines suggesting an entry for every ISO 3166 code. 808 The intercontinental convenience links Asia/Istanbul and 809 Europe/Nicosia have also been moved to 'backward'. 810 811 Changes to code 812 813 zic now creates each output file or link atomically, 814 possibly by creating a temporary file and then renaming it. 815 This avoids races where a TZ setting would temporarily stop 816 working while zic was installing a replacement file or link. 817 818 zic -L no longer omits the POSIX TZ string in its output. 819 Starting with 2020a, zic -L truncated its output according to the 820 "Expires" directive or "#expires" comment in the leapseconds file. 821 The resulting TZif files omitted daylight saving transitions after 822 the leap second table expired, which led to far less accurate 823 predictions of times after the expiry. Although future timestamps 824 cannot be converted accurately in the presence of leap seconds, it 825 is more accurate to convert near-future timestamps with a few 826 seconds error than with an hour error, so zic -L no longer 827 truncates output in this way. 828 829 Instead, when zic -L is given the "Expires" directive, it now 830 outputs the expiration by appending a no-change entry to the leap 831 second table. Although this should work well with most TZif 832 readers, it does not conform to Internet RFC 8536 and some pickier 833 clients (including tzdb 2017c through 2021a) reject it, so 834 "Expires" directives are currently disabled by default. To enable 835 them, set the EXPIRES_LINE Makefile variable. If a TZif file uses 836 this new feature it is marked with a new TZif version number 4, 837 a format intended to be documented in a successor to RFC 8536. 838 The old-format "#expires" comments are now treated solely as 839 comments and have no effect on the TZif files. 840 841 zic -L LEAPFILE -r @LO no longer generates an invalid TZif file 842 that omits leap second information for the range LO..B when LO 843 falls between two leap seconds A and B. Instead, it generates a 844 TZif version 4 file that represents the previously missing 845 information. 846 847 The TZif reader now allows the leap second table to begin with a 848 correction other than -1 or +1, and to contain adjacent 849 transitions with equal corrections. This supports TZif version 4. 850 851 The TZif reader now lets leap seconds occur less than 28 days 852 apart. This supports possible future TZif extensions. 853 854 Fix bug that caused 'localtime' etc. to crash when TZ was 855 set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does 856 not conform to POSIX but does conform to Internet RFC 8536. 857 858 Fix another bug that caused 'localtime' etc. to crash when TZ was 859 set to a POSIX-conforming but unusual TZ string like 860 "EST5EDT4,0/0,J365/0", where almost all the year is DST. 861 862 Fix yet another bug that caused 'localtime' etc. to mishandle slim 863 TZif files containing leap seconds after the last explicit 864 transition in the table, or when handling far-future timestamps 865 in slim TZif files lacking leap seconds. 866 867 Fix localtime misbehavior involving positive leap seconds. 868 This change affects only behavior for "right" system time, 869 which contains leap seconds, and only if the UT offset is 870 not a multiple of 60 seconds when a positive leap second occurs. 871 (No such timezone exists in tzdb, luckily.) Without the fix, 872 the timestamp was ambiguous during a positive leap second. 873 With the fix, any seconds occurring after a positive leap second 874 and within the same localtime minute are counted through 60, not 875 through 59; their UT offset (tm_gmtoff) is the same as before. 876 Here is how the fix affects timestamps in a timezone with UT 877 offset +01:23:45 (5025 seconds) and with a positive leap second at 878 1972-06-30 23:59:60 UTC (78796800): 879 880 time_t without the fix with the fix 881 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 882 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 883 ... 884 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 885 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 886 887 Fix an unlikely bug that caused 'localtime' etc. to misbehave if 888 civil time changes a few seconds before time_t wraps around, when 889 leap seconds are enabled. 890 891 Fix bug in zic -r; in some cases, the dummy time type after the 892 last time transition disagreed with the TZ string, contrary to 893 Internet RFC 8563 section 3.3. 894 895 Fix a bug with 'zic -r @X' when X is a negative leap second that 896 has a nonnegative correction. Without the fix, the output file 897 was truncated so that X appeared to be a positive leap second. 898 Fix a similar, even less likely bug when truncating at a positive 899 leap second that has a nonpositive correction. 900 901 zic -r now reports an error if given rolling leap seconds, as this 902 usage has never generally worked and is evidently unused. 903 904 zic now generates a POSIX-conforming TZ string for TZif files 905 where all-year DST is predicted for the indefinite future. 906 For example, for all-year Eastern Daylight Time, zic now generates 907 "XXX3EDT4,0/0,J365/23" where it previously generated 908 "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for 909 noting the possibility of POSIX conformance.) 910 911 zic.c no longer requires sys/wait.h (thanks to spazmodius for 912 noting it wasn't needed). 913 914 When reading slim TZif files, zdump no longer mishandles leap 915 seconds on the rare platforms where time_t counts leap seconds, 916 fixing a bug introduced in 2014g. 917 918 zdump -v now outputs timestamps at boundaries of what localtime 919 and gmtime can represent, instead of the less useful timestamps 920 one day after the minimum and one day before the maximum. 921 (Thanks to Arthur David Olson for prototype code, and to Manuela 922 Friedrich for debugging help.) 923 924 zdump's -c and -t options are now consistently inclusive for the 925 lower time bound and exclusive for the upper. Formerly they were 926 inconsistent. (Confusion noted by Martin Burnicki.) 927 928 Changes to build procedure 929 930 You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to 931 non-POSIX hosts where malloc doesn't set errno. 932 (Problem reported by Jan Engelhardt.) 933 934 Changes to documentation 935 936 tzfile.5 better matches a draft successor to RFC 8536 937 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>. 938 939 940 Release 2021a - 2021-01-24 10:54:57 -0800 941 942 Changes to future timestamps 943 944 South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. 945 (Thanks to Steffen Thorsen.) 946 947 948 Release 2020f - 2020-12-29 00:17:46 -0800 949 950 Change to build procedure 951 952 'make rearguard_tarballs' no longer generates a bad rearguard.zi, 953 fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) 954 955 956 Release 2020e - 2020-12-22 15:14:34 -0800 957 958 Briefly: 959 Volgograd switches to Moscow time on 2020-12-27 at 02:00. 960 961 Changes to future timestamps 962 963 Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. 964 (Thanks to Alexander Krivenyshev and Stepan Golosunov.) 965 966 Changes to past timestamps 967 968 Correct many pre-1986 transitions, fixing entries originally 969 derived from Shanks. The fixes include: 970 - Australia: several 1917 through 1971 transitions 971 - The Bahamas: several 1941 through 1945 transitions 972 - Bermuda: several 1917 through 1956 transitions 973 - Belize: several 1942 through 1968 transitions 974 - Ghana: several 1915 through 1956 transitions 975 - Israel and Palestine: several 1940 through 1985 transitions 976 - Kenya and adjacent: several 1908 through 1960 transitions 977 - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 978 through 1919 transitions 979 - Seychelles: the introduction of standard time in 1907, not 1906 980 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition 981 (Thanks to P Chan.) 982 983 Because of the Australia change, Australia/Currie (King Island) is 984 no longer needed, as it is identical to Australia/Hobart for all 985 timestamps since 1970 and was therefore created by mistake. 986 Australia/Currie has been moved to the 'backward' file and its 987 corrected data moved to the 'backzone' file. 988 989 Changes to past time zone abbreviations and DST flags 990 991 To better match legislation in Turks and Caicos, the 2015 shift to 992 year-round observance of -04 is now modeled as AST throughout before 993 returning to Eastern Time with US DST in 2018, rather than as 994 maintaining EDT until 2015-11-01. (Thanks to P Chan.) 995 996 Changes to documentation 997 998 The zic man page now documents zic's coalescing of transitions 999 when a zone falls back just before DST springs forward. 1000 1001 1002 Release 2020d - 2020-10-21 11:24:13 -0700 1003 1004 Briefly: 1005 Palestine ends DST earlier than predicted, on 2020-10-24. 1006 1007 Changes to past and future timestamps 1008 1009 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 1010 as previously predicted (thanks to Sharef Mustafa.) Its 1011 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen 1012 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and 1013 its spring 2020 transition was on March 28 at 00:00, not March 27 1014 (thanks to Pierre Cashon.) This affects Asia/Gaza and 1015 Asia/Hebron. Assume future spring and fall transitions will be on 1016 the Saturday preceding the last Sunday of March and October, 1017 respectively. 1018 1019 1020 Release 2020c - 2020-10-16 11:15:53 -0700 1021 1022 Briefly: 1023 Fiji starts DST later than usual, on 2020-12-20. 1024 1025 Changes to future timestamps 1026 1027 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as 1028 previously predicted. DST will still end on 2021-01-17. 1029 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that 1030 the later-than-usual start date is a one-time departure from the 1031 recent pattern. 1032 1033 Changes to build procedure 1034 1035 Rearguard tarballs now contain an empty file pacificnew. 1036 Some older downstream software expects this file to exist. 1037 (Problem reported by Mike Cullinan.) 1038 1039 1040 Release 2020b - 2020-10-06 18:35:04 -0700 1041 1042 Briefly: 1043 Revised predictions for Morocco's changes starting in 2023. 1044 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. 1045 Macquarie Island has stayed in sync with Tasmania since 2011. 1046 Casey, Antarctica is at +08 in winter and +11 in summer. 1047 zic no longer supports -y, nor the TYPE field of Rules. 1048 1049 Changes to future timestamps 1050 1051 Morocco's spring-forward after Ramadan is now predicted to occur 1052 no sooner than two days after Ramadan, instead of one day. 1053 (Thanks to Milamber.) The first altered prediction is for 2023, 1054 now predicted to spring-forward on April 30 instead of April 23. 1055 1056 Changes to past and future timestamps 1057 1058 Casey Station, Antarctica has been using +08 in winter and +11 in 1059 summer since 2018. The most recent transition from +08 to +11 was 1060 2020-10-04 00:01. Also, Macquarie Island has been staying in 1061 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) 1062 1063 Changes to past and future time zone abbreviations and DST flags 1064 1065 Canada's Yukon, represented by America/Whitehorse and 1066 America/Dawson, changes its time zone rules from -08/-07 to 1067 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. 1068 This change affects only the time zone abbreviation (MST vs PDT) 1069 and daylight saving flag for the period between the two dates. 1070 (Thanks to Andrew G. Smith.) 1071 1072 Changes to past timestamps 1073 1074 Correct several transitions for Hungary for 1918/1983. 1075 For example, the 1983-09-25 fall-back was at 01:00, not 03:00. 1076 (Thanks to Gza Nyry.) Also, the 1890 transition to standard 1077 time was on 11-01, not 10-01 (thanks to Michael Deckers). 1078 1079 The 1891 French transition was on March 16, not March 15. The 1080 1911-03-11 French transition was at midnight, not a minute later. 1081 Monaco's transitions were on 1892-06-01 and 1911-03-29, not 1082 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) 1083 1084 Changes to code 1085 1086 Support for zic's long-obsolete '-y YEARISTYPE' option has been 1087 removed and, with it, so has support for the TYPE field in Rule 1088 lines, which is now reserved for compatibility with earlier zic. 1089 These features were previously deprecated in release 2015f. 1090 (Thanks to Tim Parenti.) 1091 1092 zic now defaults to '-b slim' instead of to '-b fat'. 1093 1094 zic's new '-l -' and '-p -' options uninstall any existing 1095 localtime and posixrules files, respectively. 1096 1097 The undocumented and ineffective tzsetwall function has been 1098 removed. 1099 1100 Changes to build procedure 1101 1102 The Makefile now defaults POSIXRULES to '-', so the posixrules 1103 feature (obsolete as of 2019b) is no longer installed by default. 1104 1105 Changes to documentation and commentary 1106 1107 The long-obsolete files pacificnew, systemv, and yearistype.sh have 1108 been removed from the distribution. (Thanks to Tim Parenti.) 1109 1110 1111 Release 2020a - 2020-04-23 16:03:47 -0700 1112 1113 Briefly: 1114 Morocco springs forward on 2020-05-31, not 2020-05-24. 1115 Canada's Yukon advanced to -07 year-round on 2020-03-08. 1116 America/Nuuk renamed from America/Godthab. 1117 zic now supports expiration dates for leap second lists. 1118 1119 Changes to future timestamps 1120 1121 Morocco's second spring-forward transition in 2020 will be May 31, 1122 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) 1123 Adjust future-year predictions to use the first Sunday after the 1124 day after Ramadan, not the first Sunday after Ramadan. 1125 1126 Canada's Yukon, represented by America/Whitehorse and 1127 America/Dawson, advanced to -07 year-round, beginning with its 1128 spring-forward transition on 2020-03-08, and will not fall back on 1129 2020-11-01. Although a government press release calls this 1130 "permanent Pacific Daylight Saving Time", we prefer MST for 1131 consistency with nearby Dawson Creek, Creston, and Fort Nelson. 1132 (Thanks to Tim Parenti.) 1133 1134 Changes to past timestamps 1135 1136 Shanghai observed DST in 1919. (Thanks to Phake Nick.) 1137 1138 Changes to timezone identifiers 1139 1140 To reflect current usage in English better, America/Godthab has 1141 been renamed to America/Nuuk. A backwards-compatibility link 1142 remains for the old name. 1143 1144 Changes to code 1145 1146 localtime.c no longer mishandles timestamps after the last 1147 transition in a TZif file with leap seconds and with daylight 1148 saving time transitions projected into the indefinite future. 1149 For example, with TZ='America/Los_Angeles' with leap seconds, 1150 zdump formerly reported a DST transition on 2038-03-14 1151 from 01:59:32.999... to 02:59:33 instead of the correct transition 1152 from 01:59:59.999... to 03:00:00. 1153 1154 zic -L now supports an Expires line in the leapseconds file, and 1155 truncates the TZif output accordingly. This propagates leap 1156 second expiration information into the TZif file, and avoids the 1157 abovementioned localtime.c bug as well as similar bugs present in 1158 many client implementations. If no Expires line is present, zic 1159 -L instead truncates the TZif output based on the #expires comment 1160 present in leapseconds files distributed by tzdb 2018f and later; 1161 however, this usage is obsolescent. For now, the distributed 1162 leapseconds file has an Expires line that is commented out, so 1163 that the file can be fed to older versions of zic which ignore the 1164 commented-out line. Future tzdb distributions are planned to 1165 contain a leapseconds file with an Expires line. 1166 1167 The configuration macros HAVE_TZNAME and USG_COMPAT should now be 1168 set to 1 if the system library supports the feature, and 2 if not. 1169 As before, these macros are nonzero if tzcode should support the 1170 feature, zero otherwise. 1171 1172 The configuration macro ALTZONE now has the same values with the 1173 same meaning as HAVE_TZNAME and USG_COMPAT. 1174 1175 The code's defense against CRLF in leap-seconds.list is now 1176 portable to POSIX awk. (Problem reported by Deborah Goldsmith.) 1177 1178 Although the undocumented tzsetwall function is not changed in 1179 this release, it is now deprecated in preparation for removal in 1180 future releases. Due to POSIX requirements, tzsetwall has not 1181 worked for some time. Any code that uses it should instead use 1182 tzalloc(NULL) or, if portability trumps thread-safety, should 1183 unset the TZ environment variable. 1184 1185 Changes to commentary 1186 1187 The les-de-la-Madeleine and the Listuguj reserve are noted as 1188 following America/Halifax, and comments about Yukon's "south" and 1189 "north" have been corrected to say "east" and "west". (Thanks to 1190 Jeffery Nichols.) 1191 1192 1193 Release 2019c - 2019-09-11 08:59:48 -0700 1194 1195 Briefly: 1196 Fiji observes DST from 2019-11-10 to 2020-01-12. 1197 Norfolk Island starts observing Australian-style DST. 1198 1199 Changes to future timestamps 1200 1201 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 1202 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) 1203 Adjust future guesses accordingly. 1204 1205 Norfolk Island will observe Australian-style DST starting in 1206 spring 2019. The first transition is on 2019-10-06. (Thanks to 1207 Kyle Czech and Michael Deckers.) 1208 1209 Changes to past timestamps 1210 1211 Many corrections to time in Turkey from 1940 through 1985. 1212 (Thanks to Oya Vula via Alois Treindl, and to Kvan Yazan.) 1213 1214 The Norfolk Island 1975-03-02 transition was at 02:00 standard 1215 time, not 02:00 DST. (Thanks to Michael Deckers.) 1216 1217 South Korea observed DST from 1948 through 1951. Although this 1218 info was supposed to appear in release 2014j, a typo inadvertently 1219 suppressed the change. (Thanks to Alois Treindl.) 1220 1221 Detroit observed DST in 1967 and 1968 following the US DST rules, 1222 except that its 1967 DST began on June 14 at 00:01. (Thanks to 1223 Alois Treindl for pointing out that the old data entries were 1224 probably wrong.) 1225 1226 Fix several errors in pre-1970 transitions in Perry County, IN. 1227 (Thanks to Alois Treindl for pointing out the 1967/9 errors.) 1228 1229 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver 1230 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 1231 10-06. In 1945 Knigsberg (now Kaliningrad) switched from +01/+02 1232 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated 1233 EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 1234 Knigsberg switched to +03 on 04-07 not 01-01. 1235 1236 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 1237 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) 1238 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. 1239 1240 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. 1241 (Thanks to Michael Deckers.) 1242 1243 Changes to past time zone abbreviations and DST flags 1244 1245 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, 1246 is now flagged as DST and is abbreviated HKWT not HKT. 1247 1248 Changes to code 1249 1250 leapseconds.awk now relies only on its input data, rather than 1251 also relying on its comments. (Inspired by code from Dennis 1252 Ferguson and Chris Woodbury.) 1253 1254 The code now defends against CRLFs in leap-seconds.list. 1255 (Thanks to Brian Inglis and Chris Woodbury.) 1256 1257 Changes to documentation and commentary 1258 1259 theory.html discusses leap seconds. (Thanks to Steve Summit.) 1260 1261 Nashville's newspapers dueled about the time of day in the 1950s. 1262 (Thanks to John Seigenthaler.) 1263 1264 Liechtenstein observed Swiss DST in 1941/2. 1265 (Thanks to Alois Treindl.) 1266 1267 1268 Release 2019b - 2019-07-01 00:09:53 -0700 1269 1270 Briefly: 1271 Brazil no longer observes DST. 1272 'zic -b slim' outputs smaller TZif files; please try it out. 1273 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 1274 1275 Changes to future timestamps 1276 1277 Brazil has canceled DST and will stay on standard time indefinitely. 1278 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 1279 Oliveira.) 1280 1281 Predictions for Morocco now go through 2087 instead of 2037, to 1282 work around a problem on newlib when using TZif files output by 1283 zic 2019a or earlier. (Problem reported by David Gauchard.) 1284 1285 Changes to past and future timestamps 1286 1287 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 1288 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 1289 future transitions to be March's last Friday at 00:00. 1290 1291 Changes to past timestamps 1292 1293 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 1294 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 1295 not 09-15 at 00:00. In 1946 its spring-forward transition was on 1296 04-21 at 00:00, not the previous day at 03:30. From 1946 through 1297 1952 its fall-back transitions occurred at 04:30, not at 03:30. 1298 In 1947 its fall-back transition was on 11-30, not 12-30. 1299 (Thanks to P Chan.) 1300 1301 Changes to past time zone abbreviations 1302 1303 Italy's 1866 transition to Rome Mean Time was on December 12, not 1304 September 22. This affects only the time zone abbreviation for 1305 Europe/Rome between those dates. (Thanks to Stephen Trainor and 1306 Luigi Rosa.) 1307 1308 Changes affecting metadata only 1309 1310 Add info about the Crimea situation in zone1970.tab and zone.tab. 1311 (Problem reported by Serhii Demediuk.) 1312 1313 Changes to code 1314 1315 zic's new -b option supports a way to control data bloat and to 1316 test for year-2038 bugs in software that reads TZif files. 1317 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 1318 for example, changing from fat to slim shrinks the Europe/London 1319 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 1320 files represent the same set of timestamps and use the same TZif 1321 format as documented in tzfile(5) and in Internet RFC 8536. 1322 Fat format attempts to work around bugs or incompatibilities in 1323 older software, notably software that mishandles 64-bit TZif data 1324 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 1325 Slim format is more efficient and does not work around 64-bit bugs 1326 or obsolete TZ strings. Currently zic defaults to fat format 1327 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 1328 out-of-the-box default is intended to change in future releases 1329 as the buggy software often mishandles timestamps anyway. 1330 1331 zic no longer treats a set of rules ending in 2037 specially. 1332 Previously, zic assumed that such a ruleset meant that future 1333 timestamps could not be predicted, and therefore omitted a 1334 POSIX-like TZ string in the TZif output. The old behavior is no 1335 longer needed for current tzdata, and caused problems with newlib 1336 when used with older tzdata (reported by David Gauchard). 1337 1338 zic no longer generates some artifact transitions. For example, 1339 Europe/London no longer has a no-op transition in January 1996. 1340 1341 Changes to build procedure 1342 1343 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 1344 by a percent or so. 1345 1346 Changes to documentation and commentary 1347 1348 The Makefile now documents the POSIXRULES macro as being obsolete, 1349 and similarly, zic's -p POSIXRULES option is now documented as 1350 being obsolete. Although the POSIXRULES feature still exists and 1351 works as before, in practice it is rarely used for its intended 1352 purpose, and it does not work either in the default reference 1353 implementation (for timestamps after 2037) or in common 1354 implementations such as GNU/Linux (for contemporary timestamps). 1355 Since POSIXRULES was designed primarily as a temporary transition 1356 facility for System V platforms that died off decades ago, it is 1357 being decommissioned rather than institutionalized. 1358 1359 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 1360 1361 1362 Release 2019a - 2019-03-25 22:01:33 -0700 1363 1364 Briefly: 1365 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 1366 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 1367 1368 Changes to past and future timestamps 1369 1370 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 1371 previously predicted. Adjust our prediction by guessing that spring 1372 transitions will be between 24 and 30 March, which matches recent practice 1373 since 2016. (Thanks to Even Scharning and Tim Parenti.) 1374 1375 Metlakatla ended its observance of Pacific standard time, 1376 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 1377 Stanley and Tim Parenti.) 1378 1379 Changes to past timestamps 1380 1381 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 1382 (Thanks to Alois Treindl and Isaac Starkman.) 1383 1384 Changes to time zone abbreviations 1385 1386 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 1387 of being a separate zone that generates the abbreviation "UCT", 1388 which nowadays is typically a typo. (Problem reported by Isiah 1389 Meadows.) 1390 1391 Changes to code 1392 1393 zic now has an -r option to limit the time range of output data. 1394 For example, 'zic -r @1000000000' limits the output data to 1395 timestamps starting 1000000000 seconds after the Epoch. 1396 This helps shrink output size and can be useful for applications 1397 not needing the full timestamp history, such as TZDIST truncation; 1398 see Internet RFC 8536 section 5.1. (Inspired by a feature request 1399 from Christopher Wong, helped along by bug reports from Wong and 1400 from Tim Parenti.) 1401 1402 Changes to documentation 1403 1404 Mention Internet RFC 8536 (February 2019), which documents TZif. 1405 1406 tz-link.html now cites tzdata-meta 1407 <https://tzdata-meta.timtimeonline.com/>. 1408 1409 1410 Release 2018i - 2018-12-30 11:05:43 -0800 1411 1412 Briefly: 1413 So Tom and Prncipe switches from +01 to +00 on 2019-01-01. 1414 1415 Changes to future timestamps 1416 1417 Due to a change in government, So Tom and Prncipe switches back 1418 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 1419 Nasardinov and Michael Deckers.) 1420 1421 1422 Release 2018h - 2018-12-23 17:59:32 -0800 1423 1424 Briefly: 1425 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 1426 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 1427 Metlakatla, Alaska observes PST this winter only. 1428 Guess Morocco will continue to adjust clocks around Ramadan. 1429 Add predictions for Iran from 2038 through 2090. 1430 1431 Changes to future timestamps 1432 1433 Guess that Morocco will continue to fall back just before and 1434 spring forward just after Ramadan, the practice since 2012. 1435 (Thanks to Maamar Abdelkader.) This means Morocco will observe 1436 negative DST during Ramadan in main and vanguard formats, and in 1437 rearguard format it stays in the +00 timezone and observes 1438 ordinary DST in all months other than Ramadan. As before, extend 1439 this guesswork to the year 2037. As a consequence, Morocco is 1440 scheduled to observe three DST transitions in some Gregorian years 1441 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 1442 calendars. 1443 1444 The table of exact transitions for Iranian DST has been extended. 1445 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 1446 It now cuts off before 2091 as there is doubt about how the Persian 1447 calendar will treat 2091. This change predicts DST transitions in 1448 2038-9, 2042-3, and 2046-7 to occur one day later than previously 1449 predicted. As before, post-cutoff transitions are approximated. 1450 1451 Changes to past and future timestamps 1452 1453 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 1454 +05 on 2018-12-21. This is a zone split as Qostanay (aka 1455 Kostanay) did not switch, so create a zone Asia/Qostanay. 1456 1457 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 1458 It did not change clocks that day and remains on -08 this winter. 1459 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 1460 rules next spring, so this change affects only timestamps 1461 from 2018-11-04 through 2019-03-10. 1462 1463 Change to past timestamps 1464 1465 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 1466 not 00:00. I transcribed the time incorrectly from Shanks. 1467 (Thanks to Phake Nick.) 1468 1469 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 1470 (Thanks to Phake Nick.) 1471 1472 Guam observed DST irregularly from 1959 through 1977. 1473 (Thanks to Phake Nick.) 1474 1475 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 1476 10-01 changed standard time to +08:30 (not +08). Its transition 1477 back to +08 after WWII was on 1945-09-15, not the previous day. 1478 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 1479 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 1480 its 1952 fallback was on 11-02 (not 10-25). 1481 1482 This release contains many changes to timestamps before 1946 due 1483 to Japanese possession or occupation of Pacific/Chuuk, 1484 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 1485 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 1486 (Thanks to Phake Nick.) 1487 1488 Assume that the Spanish East Indies was like the Philippines and 1489 observed American time until the end of 1844. This affects 1490 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 1491 1492 Changes to past tm_isdst flags 1493 1494 For the recent Morocco change, the tm_isdst flag should be 1 from 1495 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 1496 Give a URL to the official decree. (Thanks to Matt Johnson.) 1497 1498 1499 Release 2018g - 2018-10-26 22:22:45 -0700 1500 1501 Briefly: 1502 Morocco switches to permanent +01 on 2018-10-28. 1503 1504 Changes to future timestamps 1505 1506 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 1507 so its clocks will not fall back as previously scheduled. 1508 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 1509 1510 Changes to code 1511 1512 When generating TZif files with leap seconds, zic no longer uses a 1513 format that trips up older 32-bit clients, fixing a bug introduced 1514 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 1515 for QTBUG-53071 now also works for TZif files with leap seconds. 1516 1517 The translator to rearguard format now rewrites the line 1518 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 1519 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 1520 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 1521 and earlier. (Reported by Christos Zoulas.) 1522 1523 Changes to past time zone abbreviations 1524 1525 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 1526 This reverts to 2011h, as the abbreviation change in 2011i was 1527 likely inadvertent. 1528 1529 Changes to documentation 1530 1531 tzfile.5 has new sections on interoperability issues. 1532 1533 1534 Release 2018f - 2018-10-18 00:14:18 -0700 1535 1536 Briefly: 1537 Volgograd moves from +03 to +04 on 2018-10-28. 1538 Fiji ends DST 2019-01-13, not 2019-01-20. 1539 Most of Chile changes DST dates, effective 2019-04-06. 1540 1541 Changes to future timestamps 1542 1543 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 1544 (Thanks to Alexander Fetisov and Stepan Golosunov.) 1545 1546 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 1547 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 1548 accordingly. 1549 1550 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 1551 time, and resume DST on the first Saturday in September at 24:00 mainland 1552 time. The changes are effective from 2019-04-06, and do not affect the 1553 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 1554 and Tim Parenti.) Adjust future predictions accordingly. 1555 1556 Changes to past timestamps 1557 1558 The 2018-05-05 North Korea 30-minute time zone change took place 1559 at 23:30 the previous day, not at 00:00 that day. 1560 1561 China's 1988 spring-forward transition was on April 17, not 1562 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 1563 (Thanks to P Chan.) 1564 1565 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 1566 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 1567 temporarily switched to +09/+10 during World War II. Macau 1568 observed DST in 1942/79, not 1961/80, and there were several 1569 errors for transition times and dates. (Thanks to P Chan.) 1570 1571 The 1948-1951 fallback transitions in Japan were at 25:00 on 1572 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 1573 zic turns this into 01:00 on the day after September's second 1574 Saturday, which is the best that POSIX or C platforms can do. 1575 1576 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 1577 paper by Li Yu, replacing more-questionable data from Shanks. 1578 1579 Changes to time zone abbreviations 1580 1581 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 1582 1583 Changes to code 1584 1585 zic now always generates TZif files where time type 0 is used for 1586 timestamps before the first transition. This simplifies the 1587 reading of TZif files and should not affect behavior of existing 1588 TZif readers because the same set of time types is used; only 1589 their internal indexes may have changed. This affects only the 1590 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 1591 EET, which previously used nonzero types for these timestamps. 1592 1593 Because of the type 0 change, zic no longer outputs a dummy 1594 transition at time -2**59 (before the Big Bang), as clients should 1595 no longer need this to handle historical timestamps correctly. 1596 This reverts a change introduced in 2013d and shrinks most TZif 1597 files by a few bytes. 1598 1599 zic now supports negative time-of-day in Rule and Leap lines, e.g., 1600 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 1601 occurs at 18:00 on the Saturday before the last Sunday in April. 1602 This behavior was documented in 2018a but the code did not 1603 entirely match the documentation. 1604 1605 localtime.c no longer requires at least one time type in TZif 1606 files that lack transitions or have a POSIX-style TZ string. This 1607 future-proofs the code against possible future extensions to the 1608 format that would allow TZif files with POSIX-style TZ strings and 1609 without transitions or time types. 1610 1611 A read-access subscript error in localtime.c has been fixed. 1612 It could occur only in TZif files with timecnt == 0, something that 1613 does not happen in practice now but could happen in future versions. 1614 1615 localtime.c no longer ignores TZif POSIX-style TZ strings that 1616 specify only standard time. Instead, these TZ strings now 1617 override the default time type for timestamps after the last 1618 transition (or for all timestamps if there are no transitions), 1619 just as DST strings specifying DST have always done. 1620 1621 leapseconds.awk now outputs "#updated" and "#expires" comments, 1622 and supports leap seconds at the ends of months other than June 1623 and December. (Inspired by suggestions from Chris Woodbury.) 1624 1625 Changes to documentation 1626 1627 New restrictions: A Rule name must start with a character that 1628 is neither an ASCII digit nor "-" nor "+", and an unquoted name 1629 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 1630 The latter restriction makes room for future extensions (a 1631 possibility noted by Tom Lane). 1632 1633 tzfile.5 now documents what time types apply before the first and 1634 after the last transition, if any. 1635 1636 Documentation now uses the spelling "timezone" for a TZ setting 1637 that determines timestamp history, and "time zone" for a 1638 geographic region currently sharing the same standard time. 1639 1640 The name "TZif" is now used for the tz binary data format. 1641 1642 tz-link.htm now mentions the A0 TimeZone Migration utilities. 1643 (Thanks to Aldrin Martoq for the link.) 1644 1645 Changes to build procedure 1646 1647 New 'make' target 'rearguard_tarballs' to build the rearguard 1648 tarball only. This is a convenience on platforms that lack lzip 1649 if you want to build the rearguard tarball. (Problem reported by 1650 Deborah Goldsmith.) 1651 1652 tzdata.zi is now more stable from release to release. (Problem 1653 noted by Tom Lane.) It is also a bit shorter. 1654 1655 tzdata.zi now can contain comment lines documenting configuration 1656 information, such as which data format was selected, which input 1657 files were used, and how leap seconds are treated. (Problems 1658 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 1659 are used these comment lines are absent, for backward 1660 compatibility. A redistributor intending to alter its copy of the 1661 files should also append "-LABEL" to the 'version' file's first 1662 line, where "LABEL" identifies the redistributor's change. 1663 1664 1665 Release 2018e - 2018-05-01 23:42:51 -0700 1666 1667 Briefly: 1668 1669 North Korea switches back to +09 on 2018-05-05. 1670 The main format uses negative DST again, for Ireland etc. 1671 'make tarballs' now also builds a rearguard tarball. 1672 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 1673 1674 Changes to past and future timestamps 1675 1676 North Korea switches back from +0830 to +09 on 2018-05-05. 1677 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 1678 and Tim Parenti.) 1679 1680 Bring back the negative-DST changes of 2018a, except be more 1681 compatible with data parsers that do not support negative DST. 1682 Also, this now affects historical timestamps in Namibia and the 1683 former Czechoslovakia, not just Ireland. The main format now uses 1684 negative DST to model timestamps in Europe/Dublin (from 1971 on), 1685 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 1686 does not affect UT offsets, only time zone abbreviations and the 1687 tm_isdst flag. Also, this does not affect rearguard or vanguard 1688 formats; effectively the main format now uses vanguard instead of 1689 rearguard format. Data parsers that do not support negative DST 1690 can still use data from the rearguard tarball described below. 1691 1692 Changes to build procedure 1693 1694 The command 'make tarballs' now also builds the tarball 1695 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 1696 except that it uses rearguard format intended for trailing-edge 1697 data parsers. 1698 1699 Changes to data format and to code 1700 1701 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 1702 suffix, which specifies whether the adjusted time is standard time 1703 or daylight saving time. If no suffix is given, daylight saving 1704 time is used if and only if the SAVE column is nonzero; this is 1705 the longstanding behavior. Although this new feature is not used 1706 in tzdata, it could be used to specify the legal time in Namibia 1707 1994-2017, as opposed to the popular time (see below). 1708 1709 Changes to past timestamps 1710 1711 From 1994 through 2017 Namibia observed DST in winter, not summer. 1712 That is, it used negative DST, as Ireland still does. This change 1713 does not affect UTC offsets; it affects only the tm_isdst flag and 1714 the abbreviation used during summer, which is now CAT, not WAST. 1715 Although (as noted by Michael Deckers) summer and winter time were 1716 both simply called "standard time" in Namibian law, in common 1717 practice winter time was considered to be DST (as noted by Stephen 1718 Colebourne). The full effect of this change is only in vanguard 1719 and main format; in rearguard format, the tm_isdst flag is still 1720 zero in winter and nonzero in summer. 1721 1722 In 1946/7 Czechoslovakia also observed negative DST in winter. 1723 The full effect of this change is only in vanguard and main 1724 formats; in rearguard format, it is modeled as plain GMT without 1725 daylight saving. Also, the dates of some 1944/5 DST transitions 1726 in Czechoslovakia have been changed. 1727 1728 1729 Release 2018d - 2018-03-22 07:05:46 -0700 1730 1731 Briefly: 1732 1733 Palestine starts DST a week earlier in 2018. 1734 Add support for vanguard and rearguard data consumers. 1735 Add subsecond precision to source data format, though not to data. 1736 1737 Changes to future timestamps 1738 1739 In 2018, Palestine starts DST on March 24, not March 31. 1740 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 1741 1742 Changes to past and future timestamps 1743 1744 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 1745 at 04:00. (Thanks to Steffen Thorsen.) 1746 1747 Changes to past timestamps 1748 1749 Historical transitions for Uruguay, represented by 1750 America/Montevideo, have been updated per official legal documents, 1751 replacing previous data mainly originating from the inventions of 1752 Shanks & Pottenger. This has resulted in adjustments ranging from 1753 30 to 90 minutes in either direction over at least two dozen 1754 distinct periods ranging from one day to several years in length. 1755 A mere handful of pre-1991 transitions are unaffected; data since 1756 then has come from more reliable contemporaneous reporting. These 1757 changes affect various timestamps in 1920-1923, 1936, 1939, 1758 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 1759 Additionally, Uruguay's pre-standard-time UT offset has been 1760 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 1761 match the location of the Observatory of the National Meteorological 1762 Institute in Montevideo. 1763 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 1764 1765 East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. 1766 (Thanks to Kerry Shetline.) 1767 1768 Fix the 1912-01-01 transition for Portugal and its colonies. 1769 This transition was at 00:00 according to the new UT offset, not 1770 according to the old one. Also assume that Cape Verde switched on 1771 the same date as the rest, not in 1907. This affects 1772 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 1773 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 1774 (Thanks to Michael Deckers.) 1775 1776 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 1777 Turks & Caicos. 1778 1779 Changes to past time zone abbreviations 1780 1781 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 1782 is no clock change associated with the transition. 1783 1784 Changes to build procedure 1785 1786 The new DATAFORM macro in the Makefile lets the installer choose 1787 among three source data formats. The idea is to lessen downstream 1788 disruption when data formats are improved. 1789 1790 * DATAFORM=vanguard installs from the latest, bleeding-edge 1791 format. DATAFORM=main (the default) installs from the format 1792 used in the 'africa' etc. files. DATAFORM=rearguard installs 1793 from a trailing-edge format. Eventually, elements of today's 1794 vanguard format should move to the main format, and similarly 1795 the main format's features should eventually move to the 1796 rearguard format. 1797 1798 * In the current version, the main and rearguard formats are 1799 identical and match that of 2018c, so this change does not 1800 affect default behavior. The vanguard format currently contains 1801 one feature not in the main format: negative SAVE values. This 1802 improves support for Ireland, which uses Irish Standard Time 1803 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 1804 supported negative SAVE values for decades, and this feature 1805 should move to the main format soon. However, it will not move 1806 to the rearguard format for quite some time because some 1807 downstream parsers do not support it. 1808 1809 * The build procedure constructs three files vanguard.zi, main.zi, 1810 and rearguard.zi, one for each format. Although the files 1811 represent essentially the same data, they may have minor 1812 discrepancies that users are not likely to notice. The files 1813 are intended for downstream data consumers and are not 1814 installed. Zoneinfo parsers that do not support negative SAVE values 1815 should start using rearguard.zi, so that they will be unaffected 1816 when the negative-DST feature moves from vanguard to main. 1817 Bleeding-edge Zoneinfo parsers that support the new features 1818 already can use vanguard.zi; in this respect, current tzcode is 1819 bleeding-edge. 1820 1821 The Makefile should now be safe for parallelized builds, and 'make 1822 -j to2050new.tzs' is now much faster on a multiprocessor host 1823 with GNU Make. 1824 1825 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 1826 prepends TZDIR/ to file names that do not begin with '/'. This is 1827 not recommended for general use, due to its security implications. 1828 (From a suggestion by Manuela Friedrich.) 1829 1830 Changes to code 1831 1832 zic now accepts subsecond precision in expressions like 1833 00:19:32.13, which is approximately the legal time of the 1834 Netherlands from 1835 to 1937. However, because it is 1835 questionable whether the few recorded uses of non-integer offsets 1836 had subsecond precision in practice, there are no plans for tzdata 1837 to use this feature. (Thanks to Steve Allen for pointing out 1838 the limitations of historical data in this area.) 1839 1840 The code is a bit more portable to MS-Windows. Installers can 1841 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 1842 reserve identifiers like 'localtime'. (Thanks to Manuela 1843 Friedrich.) 1844 1845 Changes to documentation and commentary 1846 1847 theory.html now outlines tzdb's extensions to POSIX's model for 1848 civil time, and has a section "POSIX features no longer needed" 1849 that lists POSIX API components that are now vestigial. 1850 (From suggestions by Steve Summit.) It also better distinguishes 1851 time zones from tz regions. (From a suggestion by Guy Harris.) 1852 1853 Commentary is now more consistent about using the phrase "daylight 1854 saving time", to match the C name tm_isdst. Daylight saving time 1855 need not occur in summer, and need not have a positive offset from 1856 standard time. 1857 1858 Commentary about historical transitions in Uruguay has been expanded 1859 with links to many relevant legal documents. 1860 (Thanks to Tim Parenti.) 1861 1862 Commentary now uses some non-ASCII characters with Unicode value 1863 less than U+0100, as they can be useful and should work even with 1864 older editors such as XEmacs. 1865 1866 1867 Release 2018c - 2018-01-22 23:00:44 -0800 1868 1869 Briefly: 1870 Revert Irish changes that relied on negative SAVE values. 1871 1872 Changes to tm_isdst 1873 1874 Revert the 2018a change to Europe/Dublin. As before, this change 1875 does not affect UT offsets or abbreviations; it affects only 1876 whether timestamps are considered to be standard time or 1877 daylight-saving time, as expressed in the tm_isdst flag of C's 1878 struct tm type. This reversion is intended to be a temporary 1879 workaround for problems discovered with downstream uses of 1880 releases 2018a and 2018b, which implemented Irish time by using 1881 negative SAVE values in the Eire rules of the 'europe' file. 1882 Although negative SAVE values have been part of tzcode for many 1883 years and are supported by many platforms, they were not 1884 documented before 2018a and ICU and OpenJDK do not currently 1885 support them. A mechanism to export data to platforms lacking 1886 support for negative DST is planned to be developed before the 1887 change is reapplied. (Problems reported by Deborah Goldsmith and 1888 Stephen Colebourne.) 1889 1890 Changes to past timestamps 1891 1892 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 1893 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 1894 1895 Changes to build procedure 1896 1897 The build procedure now works around mawk 1.3.3's lack of support 1898 for character class expressions. (Problem reported by Ohyama.) 1899 1900 1901 Release 2018b - 2018-01-17 23:24:48 -0800 1902 1903 Briefly: 1904 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 1905 1906 Changes to build procedure 1907 1908 The distribution now contains the file 'pacificnew' again. 1909 This file was inadvertently omitted in the 2018a distribution. 1910 (Problem reported by Matias Fonzo.) 1911 1912 1913 Release 2018a - 2018-01-12 22:29:21 -0800 1914 1915 Briefly: 1916 So Tom and Prncipe switched from +00 to +01. 1917 Brazil's DST will now start on November's first Sunday. 1918 Ireland's standard time is now in the summer, not the winter. 1919 Use Debian-style installation locations, instead of 4.3BSD-style. 1920 New zic option -t. 1921 1922 Changes to past and future timestamps 1923 1924 So Tom and Prncipe switched from +00 to +01 on 2018-01-01 at 1925 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 1926 1927 Changes to future timestamps 1928 1929 Starting in 2018 southern Brazil will begin DST on November's 1930 first Sunday instead of October's third Sunday. (Thanks to 1931 Steffen Thorsen.) 1932 1933 Changes to past timestamps 1934 1935 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 1936 been corrected. The 'backzone' and 'zone.tab' files did not agree 1937 with the 'africa' and 'zone1970.tab' files. (Problem reported by 1938 Michael Deckers.) 1939 1940 The abbreviation invented for Bolivia Summer Time (1931-2) is now 1941 BST instead of BOST, to be more consistent with the convention 1942 used for Latvian Summer Time (1918-9) and for British Summer Time. 1943 1944 Changes to tm_isdst 1945 1946 Change Europe/Dublin so that it observes Irish Standard Time (UT 1947 +01) in summer and GMT (as negative daylight-saving) in winter, 1948 instead of observing standard time (GMT) in winter and Irish 1949 Summer Time (UT +01) in summer. This change does not affect UT 1950 offsets or abbreviations; it affects only whether timestamps are 1951 considered to be standard time or daylight-saving time, as 1952 expressed in the tm_isdst flag of C's struct tm type. 1953 (Discrepancy noted by Derick Rethans.) 1954 1955 Changes to build procedure 1956 1957 The default installation locations have been changed to mostly 1958 match Debian circa 2017, instead of being designed as an add-on to 1959 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 1960 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 1961 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 1962 locations more precisely. (This responds to suggestions from 1963 Brian Inglis and from Steve Summit.) 1964 1965 The default installation procedure no longer creates the 1966 backward-compatibility link US/Pacific-New, which causes 1967 confusion during user setup (e.g., see Debian bug 815200). 1968 Use 'make BACKWARD="backward pacificnew"' to create the link 1969 anyway, for now. Eventually we plan to remove the link entirely. 1970 1971 tzdata.zi now contains a version-number comment. 1972 (Suggested by Tom Lane.) 1973 1974 The Makefile now quotes values like BACKWARD more carefully when 1975 passing them to the shell. (Problem reported by Zefram.) 1976 1977 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 1978 that have snprintf and use pre-C99 compilers. (Problem reported 1979 by Jon Skeet.) 1980 1981 Changes to code 1982 1983 zic has a new option -t FILE that specifies the location of the 1984 file that determines local time when TZ is unset. The default for 1985 this location can be configured via the new TZDEFAULT makefile 1986 macro, which defaults to /etc/localtime. 1987 1988 Diagnostics and commentary now distinguish UT from UTC more 1989 carefully; see theory.html for more information about UT vs UTC. 1990 1991 zic has been ported to GCC 8's -Wstringop-truncation option. 1992 (Problem reported by Martin Sebor.) 1993 1994 Changes to documentation and commentary 1995 1996 The zic man page now documents the longstanding behavior that 1997 times and years can be out of the usual range, with negative times 1998 counting backwards from midnight and with year 0 preceding year 1. 1999 (Problem reported by Michael Deckers.) 2000 2001 The theory.html file now mentions the POSIX limit of six chars 2002 per abbreviation, and lists alphabetic abbreviations used. 2003 2004 The files tz-art.htm and tz-link.htm have been renamed to 2005 tz-art.html and tz-link.html, respectively, for consistency with 2006 other file names and to simplify web server configuration. 2007 2008 2009 Release 2017c - 2017-10-20 14:49:34 -0700 2010 2011 Briefly: 2012 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 2013 Fiji ends DST 2018-01-14, not 2018-01-21. 2014 Namibia switches from +01/+02 to +02 on 2018-04-01. 2015 Sudan switches from +03 to +02 on 2017-11-01. 2016 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 2017 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 2018 A new file tzdata.zi now holds a small text copy of all data. 2019 The zic input format has been regularized slightly. 2020 2021 Changes to future timestamps 2022 2023 Northern Cyprus has decided to resume EU rules starting 2024 2017-10-29, thus reinstituting winter time. 2025 2026 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 2027 predicted. (Thanks to Dominic Fok.) Adjust future predictions 2028 accordingly. 2029 2030 Namibia will switch from +01 with DST to +02 all year on 2031 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 2032 at 02:00. (Thanks to Steffen Thorsen.) 2033 2034 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 2035 Atyya and Yahia Abdalla.) South Sudan is not switching, so 2036 Africa/Juba is no longer a link to Africa/Khartoum. 2037 2038 Tonga has likely ended its experiment with DST, and will not 2039 adjust its clocks on 2017-11-05. Although Tonga has not announced 2040 whether it will continue to observe DST, the IATA is assuming that 2041 it will not. (Thanks to David Wade.) 2042 2043 Turks & Caicos will switch from -04 all year to -05 with US DST on 2044 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 2045 at 02:00. (Thanks to Steffen Thorsen.) 2046 2047 Changes to past timestamps 2048 2049 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 2050 (Thanks to Arthur David Olson.) 2051 2052 Detroit did not observe DST in 1967. 2053 2054 Use railway time for Asia/Kolkata before 1941, by switching to 2055 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 2056 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 2057 2058 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 2059 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 2060 2061 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 2062 American time in 1892, not 1879. (Thanks to Michael Deckers.) 2063 2064 Adjust the 1867 transition in Alaska to better reflect the 2065 historical record, by changing it to occur on 1867-10-18 at 15:30 2066 Sitka time rather than at the start of 1867-10-17 local time. 2067 Although strictly speaking this is accurate only for Sitka, 2068 the rest of Alaska's blanks need to be filled in somehow. 2069 2070 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 2071 (Thanks to Michael Deckers.) 2072 2073 Add 7 s to the UT offset in Asia/Yangon before 1920. 2074 2075 Changes to zone names 2076 2077 Remove Canada/East-Saskatchewan from the 'backward' file, as it 2078 exceeded the 14-character limit and was an unused misnomer anyway. 2079 2080 Changes to build procedure 2081 2082 To support applications that prefer to read time zone data in text 2083 form, two zic input files tzdata.zi and leapseconds are now 2084 installed by default. The commands 'zic tzdata.zi' and 'zic -L 2085 leapseconds tzdata.zi' can reproduce the tzdata binary files 2086 without and with leap seconds, respectively. To prevent these two 2087 new files from being installed, use 'make TZDATA_TEXT=', and to 2088 suppress leap seconds from the tzdata text installation, use 'make 2089 TZDATA_TEXT=tzdata.zi'. 2090 2091 'make BACKWARD=' now suppresses backward-compatibility names 2092 like 'US/Pacific' that are defined in the 'backward' and 2093 'pacificnew' files. 2094 2095 'make check' now works on systems that lack a UTF-8 locale, 2096 or that lack the nsgmls program. Set UTF8_LOCALE to configure 2097 the name of a UTF-8 locale, if you have one. 2098 2099 Y2K runtime checks are no longer enabled by default. Add 2100 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 2101 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 2102 to disable them. (New name suggested by Brian Inglis.) 2103 2104 The build procedure for zdump now works on AIX 7.1. 2105 (Problem reported by Kees Dekker.) 2106 2107 Changes to code 2108 2109 zic and the reference runtime now reject multiple leap seconds 2110 within 28 days of each other, or leap seconds before the Epoch. 2111 As a result, support for double leap seconds, which was 2112 obsolescent and undocumented, has been removed. Double leap 2113 seconds were an error in the C89 standard; they have never existed 2114 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 2115 noticing glitches in the code that uncovered this problem.) 2116 2117 zic now warns about use of the obsolescent and undocumented -y 2118 option, and about use of the obsolescent TYPE field of Rule lines. 2119 2120 zic now allows unambiguous abbreviations like "Sa" and "Su" for 2121 weekdays; formerly it rejected them due to a bug. Conversely, zic 2122 no longer considers non-prefixes to be abbreviations; for example, 2123 it no longer accepts "lF" as an abbreviation for "lastFriday". 2124 Also, zic warns about the undocumented usage with a "last-" 2125 prefix, e.g., "last-Fri". 2126 2127 Similarly, zic now accepts the unambiguous abbreviation "L" for 2128 "Link" in ordinary context and for "Leap" in leap-second context. 2129 Conversely, zic no longer accepts non-prefixes such as "La" as 2130 abbreviations for words like "Leap". 2131 2132 zic no longer accepts leap second lines in ordinary input, or 2133 ordinary lines in leap second input. Formerly, zic sometimes 2134 warned about this undocumented usage and handled it incorrectly. 2135 2136 The new macro HAVE_TZNAME governs whether the tzname external 2137 variable is exported, instead of USG_COMPAT. USG_COMPAT now 2138 governs only the external variables "timezone" and "daylight". 2139 This change is needed because the three variables are not in the 2140 same category: although POSIX requires tzname, it specifies the 2141 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 2142 if not defined, the code attempts to guess it from other macros. 2143 2144 localtime.c and difftime.c no longer require stdio.h, and .c files 2145 other than zic.c no longer require sys/wait.h. 2146 2147 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 2148 2149 Calculation of time_t extrema works around a bug in GCC 4.8.4 2150 (Reported by Stan Shebs and Joseph Myers.) 2151 2152 zic.c no longer mistranslates formats of line numbers in non-English 2153 locales. (Problem reported by Benno Schulenberg.) 2154 2155 Several minor changes have been made to the code to make it a 2156 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 2157 Dekker for reporting the problems.) 2158 2159 Changes to documentation and commentary 2160 2161 The two new files 'theory.html' and 'calendars' contain the 2162 contents of the removed file 'Theory'. The goal is to document 2163 tzdb theory more accessibly. 2164 2165 The zic man page now documents abbreviation rules. 2166 2167 tz-link.htm now covers how to apply tzdata changes to clients. 2168 (Thanks to Jorge Fbregas for the AIX link.) It also mentions MySQL. 2169 2170 The leap-seconds.list URL has been updated to something that is 2171 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 2172 2173 Release 2017b - 2017-03-17 07:30:38 -0700 2174 2175 Briefly: Haiti has resumed DST. 2176 2177 Changes to past and future timestamps 2178 2179 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 2180 2181 Changes to past timestamps 2182 2183 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 2184 2185 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 2186 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 2187 2188 Changes to code 2189 2190 The reference localtime implementation now falls back on the 2191 current US daylight-saving transition rules rather than the 2192 1987-2006 rules. This fallback occurs only when (1) the TZ 2193 environment variable has a value like "AST4ADT" that asks 2194 for daylight saving time but does not specify the rules, (2) there 2195 is no file by that name, and (3) the TZDEFRULES file cannot be 2196 loaded. (Thanks to Tom Lane.) 2197 2198 2199 Release 2017a - 2017-02-28 00:05:36 -0800 2200 2201 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 2202 discontinues DST. 2203 2204 Changes to future timestamps 2205 2206 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 2207 2208 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 2209 Its clocks diverge from America/Santiago starting 2017-05-13 at 2210 23:00, hiving off a new zone America/Punta_Arenas. Although the 2211 Chilean government says this change expires in May 2019, for now 2212 assume it's permanent. (Thanks to Juan Correa and Deborah 2213 Goldsmith.) This also affects Antarctica/Palmer. 2214 2215 Changes to past timestamps 2216 2217 Fix many entries for historical timestamps for Europe/Madrid 2218 before 1979, to agree with tables compiled by Pere Planesas of the 2219 National Astronomical Observatory of Spain. As a side effect, 2220 this changes some timestamps for Africa/Ceuta before 1929, which 2221 are probably guesswork anyway. (Thanks to Steve Allen and 2222 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 2223 correcting the 1901 transition.) 2224 2225 Ecuador observed DST from 1992-11-28 to 1993-02-05. 2226 (Thanks to Alois Treindl.) 2227 2228 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 2229 (Thanks to Stepan Golosunov.) 2230 2231 Changes to past and future time zone abbreviations 2232 2233 Switch to numeric time zone abbreviations for South America, as 2234 part of the ongoing project of removing invented abbreviations. 2235 This avoids the need to invent an abbreviation for the new Chilean 2236 new zone. Similarly, switch from invented to numeric time zone 2237 abbreviations for Afghanistan, American Samoa, the Azores, 2238 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 2239 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 2240 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 2241 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 2242 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 2243 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 2244 Papua New Guinea, the Philippines, Pitcairn, Qatar, Runion, St 2245 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 2246 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 2247 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 2248 for half-hour daylight saving time in Belize before 1944 and in 2249 the Dominican Republic before 1975; and for Canary Islands before 2250 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 2251 Indian Summer Time before 1942, for Indonesia before around 1964, 2252 for Kenya before 1960, for Liberia before 1973, for Madeira before 2253 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 2254 Pakistan before 1971, for Western Sahara before 1977, and for 2255 Zaporozhye in 1880-1924. 2256 2257 For Alaska time from 1900 through 1967, instead of "CAT" use the 2258 abbreviation "AST", the abbreviation commonly used at the time 2259 (Atlantic Standard Time had not been standardized yet). Use "AWT" 2260 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 2261 2262 Use "CST" and "CDT" instead of invented abbreviations for Macau 2263 before 1999 and Taiwan before 1938, and use "JST" instead of the 2264 invented abbreviation "JCST" for Japan and Korea before 1938. 2265 2266 Change to database entry category 2267 2268 Move the Pacific/Johnston link from 'australasia' to 'backward', 2269 since Johnston is now uninhabited. 2270 2271 Changes to code 2272 2273 zic no longer mishandles some transitions in January 2038 when it 2274 attempts to work around Qt bug 53071. This fixes a bug affecting 2275 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 2276 now contains a workaround, useful when loading a file generated by 2277 a buggy zic. (Problem and localtime.c fix reported by Bradley 2278 White.) 2279 2280 zdump -i now outputs non-hour numeric time zone abbreviations 2281 without a colon, e.g., "+0530" rather than "+05:30". This agrees 2282 with zic %z and with common practice, and simplifies auditing of 2283 zdump output. 2284 2285 zdump is now buildable again with -DUSE_LTZ=0. 2286 (Problem reported by Joseph Myers.) 2287 2288 zdump.c now always includes private.h, to avoid code duplication 2289 with private.h. (Problem reported by Kees Dekker.) 2290 2291 localtime.c no longer mishandles early or late timestamps 2292 when TZ is set to a POSIX-style string that specifies DST. 2293 (Problem reported by Kees Dekker.) 2294 2295 date and strftime now cause %z to generate "-0000" instead of 2296 "+0000" when the UT offset is zero and the time zone abbreviation 2297 begins with "-". 2298 2299 Changes to documentation and commentary 2300 2301 The 'Theory' file now better documents choice of historical time 2302 zone abbreviations. (Problems reported by Michael Deckers.) 2303 2304 tz-link.htm now covers leap smearing, which is popular in clouds. 2305 2306 2307 Release 2016j - 2016-11-22 23:17:13 -0800 2308 2309 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 2310 2311 Changes to future timestamps 2312 2313 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 2314 This hives off a new zone Europe/Saratov from Europe/Volgograd. 2315 (Thanks to Yuri Konotopov and Stepan Golosunov.) 2316 2317 Changes to past timestamps 2318 2319 The new zone Asia/Atyrau for Atyra Region, Kazakhstan, is like 2320 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 2321 1999, not fall 1994. (Thanks to Stepan Golosunov.) 2322 2323 Changes to past time zone abbreviations 2324 2325 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 2326 summer time before 1948. The old use of "EET" was a typo. 2327 2328 Changes to code 2329 2330 zic no longer mishandles file systems that lack hard links, fixing 2331 bugs introduced in 2016g. (Problems reported by Tom Lane.) 2332 Also, when the destination already contains symbolic links, zic 2333 should now work better on systems where the 'link' system call 2334 does not follow symbolic links. 2335 2336 Changes to documentation and commentary 2337 2338 tz-link.htm now documents the relationship between release version 2339 numbers and development-repository commit tags. (Suggested by 2340 Paul Koning.) 2341 2342 The 'Theory' file now documents UT. 2343 2344 iso3166.tab now accents "Curaao", and commentary now mentions 2345 the names "Cabo Verde" and "Czechia". (Thanks to Ji Boh.) 2346 2347 2348 Release 2016i - 2016-11-01 23:19:52 -0700 2349 2350 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 2351 reintroduces DST on 2016-11-06. 2352 2353 Changes to future timestamps 2354 2355 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 2356 2017-01-15 at 03:00. Assume future observances in Tonga will be 2357 from the first Sunday in November through the third Sunday in 2358 January, like Fiji. (Thanks to Pulu Anau.) Switch to numeric 2359 time zone abbreviations for this zone. 2360 2361 Changes to past and future timestamps 2362 2363 Northern Cyprus is now +03 year round, causing a split in Cyprus 2364 time zones starting 2016-10-30 at 04:00. This creates a zone 2365 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 2366 2367 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 2368 (Thanks to Steffen Thorsen.) 2369 2370 Changes to past timestamps 2371 2372 Several corrections were made for pre-1975 timestamps in Italy. 2373 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 2374 Europe/Vatican. 2375 2376 First, the 1893-11-01 00:00 transition in Italy used the new UT 2377 offset (+01), not the old (+00:49:56). (Thanks to Michael 2378 Deckers.) 2379 2380 Second, rules for daylight saving in Italy were changed to agree 2381 with Italy's National Institute of Metrological Research (INRiM) 2382 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 2383 Inglis, and Michael Deckers): 2384 2385 The 1916-06-03 transition was at 24:00, not 00:00. 2386 2387 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 2388 00:00, not 01:00. 2389 2390 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 2391 01:00. 2392 2393 The 1944-09-17 transition was at 03:00, not 01:00. This 2394 particular change is taken from Italian law as INRiM's table, 2395 (which says 02:00) appears to have a typo here. Also, keep the 2396 1944-04-03 transition for Europe/Rome, as Rome was controlled by 2397 Germany then. 2398 2399 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 2400 not 00:00. 2401 2402 Changes to code 2403 2404 The code should now be buildable on AmigaOS merely by setting the 2405 appropriate Makefile variables. (From a patch by Carsten Larsen.) 2406 2407 2408 Release 2016h - 2016-10-19 23:17:57 -0700 2409 2410 Changes to future timestamps 2411 2412 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 2413 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 2414 future fall transitions will be on the last Saturday of October 2415 at 01:00, which is consistent with predicted spring transitions 2416 on the last Saturday of March. (Thanks to Tim Parenti.) 2417 2418 Changes to past timestamps 2419 2420 In Turkey, transitions in 1986-1990 were at 01:00 standard time 2421 not at 02:00, and the spring 1994 transition was on March 20, not 2422 March 27. (Thanks to Kvan Yazan.) 2423 2424 Changes to past and future time zone abbreviations 2425 2426 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 2427 instead of alphabetic ones like "IST" and "LKT". Various 2428 English-language sources use "IST", "LKT" and "SLST", with no 2429 working consensus. (Usage of "SLST" mentioned by Sadika 2430 Sumanapala.) 2431 2432 Changes to code 2433 2434 zic no longer mishandles relativizing file names when creating 2435 symbolic links like /etc/localtime, when these symbolic links 2436 are outside the usual directory hierarchy. This fixes a bug 2437 introduced in 2016g. (Problem reported by Andreas Stieger.) 2438 2439 Changes to build procedure 2440 2441 New rules 'traditional_tarballs' and 'traditional_signatures' for 2442 building just the traditional-format distribution. (Requested by 2443 Deborah Goldsmith.) 2444 2445 The file 'version' is now put into the tzdata tarball too. 2446 (Requested by Howard Hinnant.) 2447 2448 Changes to documentation and commentary 2449 2450 The 'Theory' file now has a section on interface stability. 2451 (Requested by Paul Koning.) It also mentions features like 2452 tm_zone and localtime_rz that have long been supported by the 2453 reference code. 2454 2455 tz-link.htm has improved coverage of time zone boundaries suitable 2456 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 2457 Johnson.) 2458 2459 The US commentary now mentions Allen and the "day of two noons". 2460 2461 The Fiji commentary mentions the government's 2016-10-03 press 2462 release. (Thanks to Raymond Kumar.) 2463 2464 2465 Release 2016g - 2016-09-13 08:56:38 -0700 2466 2467 Changes to future timestamps 2468 2469 Turkey switched from EET/EEST (+02/+03) to permanent +03, 2470 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 2471 than an invented abbreviation for the new time. 2472 2473 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 2474 (Thanks to Tim Parenti.) 2475 2476 Changes to past timestamps 2477 2478 For America/Los_Angeles, spring-forward transition times have been 2479 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 2480 1950-1966. 2481 2482 For zones using Soviet time on 1919-07-01, transitions to UT-based 2483 time were at 00:00 UT, not at 02:00 local time. The affected 2484 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 2485 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 2486 2487 Changes to past and future time zone abbreviations 2488 2489 The Factory zone now uses the time zone abbreviation -00 instead 2490 of a long English-language string, as -00 is now the normal way to 2491 represent an undefined time zone. 2492 2493 Several zones in Antarctica and the former Soviet Union, along 2494 with zones intended for ships at sea that cannot use POSIX TZ 2495 strings, now use numeric time zone abbreviations instead of 2496 invented or obsolete alphanumeric abbreviations. The affected 2497 zones are Antarctica/Casey, Antarctica/Davis, 2498 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 2499 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 2500 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 2501 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 2502 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 2503 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 2504 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 2505 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 2506 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 2507 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 2508 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 2509 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 2510 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 2511 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 2512 was replaced by +05, whereas MSK and MSD were kept as they are not 2513 our invention and are widely used. 2514 2515 Changes to zone names 2516 2517 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 2518 (Thanks to David Massoud.) 2519 2520 Changes to code 2521 2522 zic no longer generates binary files containing POSIX TZ-like 2523 strings that disagree with the local time type after the last 2524 explicit transition in the data. This fixes a bug with 2525 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 2526 on the reference platform. (Thanks to Alexander Belopolsky for 2527 reporting the bug and suggesting a way forward.) 2528 2529 If the installed localtime and/or posixrules files are symbolic 2530 links, zic now keeps them symbolic links when updating them, for 2531 compatibility with platforms like OpenSUSE where other programs 2532 configure these files as symlinks. 2533 2534 zic now avoids hard linking to symbolic links, avoids some 2535 unnecessary mkdir and stat system calls, and uses shorter file 2536 names internally. 2537 2538 zdump has a new -i option to generate transitions in a 2539 smaller but still human-readable format. This option is 2540 experimental, and the output format may change in future versions. 2541 (Thanks to Jon Skeet for suggesting that an option was needed, 2542 and thanks to Tim Parenti and Chris Rovick for further comments.) 2543 2544 Changes to build procedure 2545 2546 An experimental distribution format is available, in addition 2547 to the traditional format which will continue to be distributed. 2548 The new format is a tarball tzdb-VERSION.tar.lz with signature 2549 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 2550 tzdb-VERSION containing the code and data of the traditional 2551 two-tarball format, along with extra data that may be useful. 2552 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 2553 for comments about the experimental format.) 2554 2555 The release version number is now more accurate in the usual case 2556 where releases are built from a Git repository. For example, if 2557 23 commits and some working-file changes have been made since 2558 release 2016g, the version number is now something like 2559 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 2560 Tagged releases use the same version number format as before, 2561 e.g., '2016g'. To support the more accurate version number, its 2562 specification has moved from a line in the Makefile to a new 2563 source file 'version'. 2564 2565 The experimental distribution contains a file to2050.tzs that 2566 contains what should be the output of 'zdump -i -c 2050' on 2567 primary zones. If this file is available, 'make check' now checks 2568 that zdump generates this output. 2569 2570 'make check_web' now works on Fedora-like distributions. 2571 2572 Changes to documentation and commentary 2573 2574 tzfile.5 now documents the new restriction on POSIX TZ-like 2575 strings that is now implemented by zic. 2576 2577 Comments now cite URLs for some 1917-1921 Russian DST decrees. 2578 (Thanks to Alexander Belopolsky.) 2579 2580 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 2581 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 2582 description of Java 8 has been brought up to date (thanks to 2583 Stephen Colebourne). Its description of local time on Mars has 2584 been updated to match current practice, and URLs have been updated 2585 and some obsolete ones removed. 2586 2587 2588 Release 2016f - 2016-07-05 16:26:51 +0200 2589 2590 Changes affecting future timestamps 2591 2592 The Egyptian government changed its mind on short notice, and 2593 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 2594 (Thanks to Mina Samuel.) 2595 2596 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 2597 (Thanks to Stepan Golosunov.) 2598 2599 Changes to past and future timestamps 2600 2601 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 2602 abbreviations instead of invented ones. 2603 2604 Changes affecting past timestamps 2605 2606 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 2607 (Thanks to Stepan Golosunov.) 2608 2609 2610 Release 2016e - 2016-06-14 08:46:16 -0700 2611 2612 Changes affecting future timestamps 2613 2614 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 2615 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 2616 For future years, guess April's last Thursday to October's last 2617 Thursday except for Ramadan. 2618 2619 Changes affecting past timestamps 2620 2621 Locations while uninhabited now use '-00', not 'zzz', as a 2622 placeholder time zone abbreviation. This is inspired by Internet 2623 RFC 3339 and is more consistent with numeric time zone 2624 abbreviations already used elsewhere. The change affects several 2625 arctic and antarctic locations, e.g., America/Cambridge_Bay before 2626 1920 and Antarctica/Troll before 2005. 2627 2628 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 2629 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 2630 2631 Changes to code 2632 2633 zic now outputs a dummy transition at time 2**31 - 1 in zones 2634 whose POSIX-style TZ strings contain a '<'. This mostly works 2635 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 2636 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 2637 2638 Changes affecting documentation and commentary 2639 2640 tz-link.htm says why governments should give plenty of notice for 2641 time zone or DST changes, and refers to Matt Johnson's blog post. 2642 2643 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 2644 2645 2646 Release 2016d - 2016-04-17 22:50:29 -0700 2647 2648 Changes affecting future timestamps 2649 2650 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 2651 (Thanks to Alexander Krivenyshev for the heads-up.) 2652 2653 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 2654 (Thanks to Alexander Krivenyshev and Matt Johnson.) 2655 2656 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 2657 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 2658 at 02:00. (Thanks to Stepan Golosunov.) 2659 2660 Changes affecting past timestamps 2661 2662 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 2663 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 2664 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 2665 the same change. (Thanks to Stepan Golosunov.) 2666 2667 Russia and nearby locations had daylight-saving transitions on 2668 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 2669 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 2670 Golosunov.) 2671 2672 Many corrections to historical time in Kazakhstan from 1991 2673 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 2674 invented time zone abbreviations with numeric abbreviations. 2675 2676 Changes to commentary 2677 2678 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 2679 2680 2681 Release 2016c - 2016-03-23 00:51:27 -0700 2682 2683 Changes affecting future timestamps 2684 2685 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 2686 2687 Chile reverts from permanent to seasonal DST. (Thanks to Juan 2688 Correa for the heads-up, and to Tim Parenti for corrections.) 2689 Guess that future transitions are August's and May's second 2690 Saturdays at 24:00 mainland time. Also, call the period from 2691 2014-09-07 through 2016-05-14 daylight saving time instead of 2692 standard time, as that seems more appropriate now. 2693 2694 Changes affecting past timestamps 2695 2696 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 2697 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 2698 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 2699 (Thanks to Stepan Golosunov.) 2700 2701 Changes to commentary 2702 2703 Several updates and URLs for historical and proposed Russian changes. 2704 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 2705 2706 2707 Release 2016b - 2016-03-12 17:30:14 -0800 2708 2709 Compatibility note 2710 2711 Starting with release 2016b, some data entries cause zic implementations 2712 derived from tz releases 2005j through 2015e to issue warnings like 2713 "time zone abbreviation differs from POSIX standard (+03)". 2714 These warnings should not otherwise affect zic's output and can safely be 2715 ignored on today's platforms, as the warnings refer to a restriction in 2716 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 2717 warnings is to upgrade to zic derived from tz releases 2015f and later. 2718 2719 Changes affecting future timestamps 2720 2721 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 2722 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 2723 2016-03-27 at 02:00 local time. They need distinct zones since their 2724 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 2725 Altai Republic, Russia, which will switch from +06 to +07 on the same date 2726 and local time. The Astrakhan change is already official; the others have 2727 passed the first reading in the State Duma and are extremely likely. 2728 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 2729 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 2730 and Stepan Golosunov for followup.) 2731 2732 As a trial of a new system that needs less information to be made up, 2733 the new zones use numeric time zone abbreviations like "+04" 2734 instead of invented abbreviations like "ASTT". 2735 2736 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 2737 Steffen Thorsen.) 2738 2739 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 2740 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 2741 Saturday at 01:00, not March's last Friday at 24:00. 2742 2743 Changes affecting past timestamps 2744 2745 Europe/Chisinau observed DST during 1990, and switched from +04 to 2746 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 2747 (Thanks to Stepan Golosunov.) 2748 2749 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 2750 KUYT/KUYST. (Thanks to Stepan Golosunov.) 2751 2752 Changes to code 2753 2754 tzselect's diagnostics and checking, and checktab.awk's checking, 2755 have been improved. (Thanks to J William Piggott.) 2756 2757 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 2758 2759 tzselect now tests Julian-date TZ settings more accurately. 2760 (Thanks to J William Piggott.) 2761 2762 Changes to commentary 2763 2764 Comments in zone tables have been improved. (Thanks to J William Piggott.) 2765 2766 tzselect again limits its menu comments so that menus fit on a 2767 2480 alphanumeric display. 2768 2769 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 2770 2771 In the Theory file, the description of possible time zone abbreviations in 2772 tzdata has been cleaned up, as the old description was unclear and 2773 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 2774 2775 2776 Release 2016a - 2016-01-26 23:28:02 -0800 2777 2778 Changes affecting future timestamps 2779 2780 America/Cayman will not observe daylight saving this year after all. 2781 Revert our guess that it would. (Thanks to Matt Johnson.) 2782 2783 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 2784 (Thanks to Alexander Krivenyshev.) 2785 2786 Asia/Tehran now has DST predictions for the year 2038 and later, 2787 to be March 21 00:00 to September 21 00:00. This is likely better 2788 than predicting no DST, albeit off by a day every now and then. 2789 2790 Changes affecting past and future timestamps 2791 2792 America/Metlakatla switched from PST all year to AKST/AKDT on 2793 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 2794 2795 America/Santa_Isabel has been removed, and replaced with a 2796 backward compatibility link to America/Tijuana. Its contents were 2797 apparently based on a misreading of Mexican legislation. 2798 2799 Changes affecting past timestamps 2800 2801 Asia/Karachi's two transition times in 2002 were off by a minute. 2802 (Thanks to Matt Johnson.) 2803 2804 Changes affecting build procedure 2805 2806 An installer can now combine leap seconds with use of the backzone file, 2807 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 2808 The old 'make posix_packrat' rule is now marked as obsolescent. 2809 (Thanks to Ian Abbott for an initial implementation.) 2810 2811 Changes affecting documentation and commentary 2812 2813 A new file LICENSE makes it easier to see that the code and data 2814 are mostly public-domain. (Thanks to James Knight.) The three 2815 non-public-domain files now use the current (3-clause) BSD license 2816 instead of older versions of that license. 2817 2818 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 2819 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 2820 on editing tz source files (with a mention of Sublime zoneinfo, 2821 thanks to Gilmore Davidson). 2822 2823 The Theory and asia files now mention the 2015 book "The Global 2824 Transformation of Time, 1870-1950", and cite a couple of reviews. 2825 2826 The America/Chicago entry now documents the informal use of US 2827 central time in Fort Pierre, South Dakota. (Thanks to Rick 2828 McDermid, Matt Johnson, and Steve Jones.) 2829 2830 2831 Release 2015g - 2015-10-01 00:39:51 -0700 2832 2833 Changes affecting future timestamps 2834 2835 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 2836 (Thanks to Fatih.) 2837 2838 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 2839 (Thanks to Alexander Krivenyshev.) 2840 2841 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 2842 (Thanks to Ken Rylander.) 2843 2844 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 2845 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 2846 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 2847 2848 Changes affecting past timestamps 2849 2850 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 2851 2852 Changes affecting code 2853 2854 localtime no longer mishandles America/Anchorage after 2037. 2855 (Thanks to Bradley White for reporting the bug.) 2856 2857 On hosts with signed 32-bit time_t, localtime no longer mishandles 2858 Pacific/Fiji after 2038-01-16 14:00 UTC. 2859 2860 The localtime module allows the variables 'timezone', 'daylight', 2861 and 'altzone' to be in common storage shared with other modules, 2862 and declares them in case the system <time.h> does not. 2863 (Problems reported by Kees Dekker.) 2864 2865 On platforms with tm_zone, strftime.c now assumes it is not NULL. 2866 This simplifies the code and is consistent with zdump.c. 2867 (Problem reported by Christos Zoulas.) 2868 2869 Changes affecting documentation 2870 2871 The tzfile man page now documents that transition times denote the 2872 starts (not the ends) of the corresponding time periods. 2873 (Ambiguity reported by Bill Seymour.) 2874 2875 2876 Release 2015f - 2015-08-10 18:06:56 -0700 2877 2878 Changes affecting future timestamps 2879 2880 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 2881 The abbreviation remains "KST". (Thanks to Robert Elz.) 2882 2883 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 2884 and Pablo Camargo.) 2885 2886 Changes affecting past and future timestamps 2887 2888 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 2889 (Thanks to Roman Tudos.) 2890 2891 Changes affecting data format and code 2892 2893 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 2894 field of a Rule line should now be '-'; the old values 'even', 2895 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 2896 Although the implementation has not changed, these features do not 2897 work in the default installation, they are not used in the data, 2898 and they are now considered obsolescent. 2899 2900 zic now checks that two rules don't take effect at the same time. 2901 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 2902 simultaneity are now documented. 2903 2904 The two characters '%z' in a zone format now stand for the UT 2905 offset, e.g., '-07' for seven hours behind UT and '+0530' for 2906 five hours and thirty minutes ahead. This better supports time 2907 zone abbreviations conforming to POSIX.1-2001 and later. 2908 2909 Changes affecting installed data files 2910 2911 Comments for America/Halifax and America/Glace_Bay have been improved. 2912 (Thanks to Brian Inglis.) 2913 2914 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 2915 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 2916 installed data files for Europe/Simferopol and Europe/Tallinn. 2917 It does not affect timestamps. (Thanks to Howard Hinnant.) 2918 2919 Changes affecting code 2920 2921 zdump and zic no longer warn about valid time zone abbreviations 2922 like '-05'. 2923 2924 Some Visual Studio 2013 warnings have been suppressed. 2925 (Thanks to Kees Dekker.) 2926 2927 'date' no longer sets the time of day and its -a, -d, -n and -t 2928 options have been removed. Long obsolescent, the implementation 2929 of these features had porting problems. Builders no longer need 2930 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 2931 (Thanks to Kees Dekker for pointing out the problem.) 2932 2933 Changes affecting documentation 2934 2935 The Theory file mentions naming issues earlier, as these seem to be 2936 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 2937 2938 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 2939 2940 Mention that Herbert Samuel introduced the term "Summer Time". 2941 2942 2943 Release 2015e - 2015-06-13 10:56:02 -0700 2944 2945 Changes affecting future timestamps 2946 2947 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 2948 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 2949 2950 Assume Cayman Islands will observe DST starting next year, using US rules. 2951 Although it isn't guaranteed, it is the most likely. 2952 2953 Changes affecting data format 2954 2955 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 2956 spell the names of land Islands, Cte d'Ivoire, and Runion. 2957 2958 Changes affecting code 2959 2960 When displaying data, tzselect converts it to the current locale's 2961 encoding if the iconv command works. (Problem reported by random832.) 2962 2963 tzselect no longer mishandles Dominica, fixing a bug introduced 2964 in Release 2014f. (Problem reported by Owen Leibman.) 2965 2966 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 2967 This fixes a bug introduced in Release 2014f. 2968 (Problem reported by Leonardo Chiquitto.) 2969 2970 2971 Release 2015d - 2015-04-24 08:09:46 -0700 2972 2973 Changes affecting future timestamps 2974 2975 Egypt will not observe DST in 2015 and will consider canceling it 2976 permanently. For now, assume no DST indefinitely. 2977 (Thanks to Ahmed Nazmy and Tim Parenti.) 2978 2979 Changes affecting past timestamps 2980 2981 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 2982 1966-07-01. Also, Yukon's time zone history is documented better. 2983 (Thanks to Brian Inglis and Dennis Ferguson.) 2984 2985 Change affecting past and future time zone abbreviations 2986 2987 The abbreviations for Hawaii-Aleutian standard and daylight times 2988 have been changed from HAST/HADT to HST/HDT, as per US Government 2989 Printing Office style. This affects only America/Adak since 1983, 2990 as America/Honolulu was already using the new style. 2991 2992 Changes affecting code 2993 2994 zic has some minor performance improvements. 2995 2996 2997 Release 2015c - 2015-04-11 08:55:55 -0700 2998 2999 Changes affecting future timestamps 3000 3001 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 3002 not 00:00 on April's last Friday. 2015's transition will therefore be on 3003 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 3004 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 3005 3006 Changes affecting past timestamps 3007 3008 The following changes affect some pre-1991 Chile-related timestamps 3009 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 3010 3011 The 1910 transition was January 10, not January 1. 3012 3013 The 1918 transition was September 10, not September 1. 3014 3015 The UT -04 time observed from 1932 to 1942 is now considered to 3016 be standard time, not year-round DST. 3017 3018 Santiago observed DST (UT -03) from 1946-07-15 through 3019 1946-08-31, then reverted to standard time, then switched to -05 3020 on 1947-04-01. 3021 3022 Assume transitions before 1968 were at 00:00, since we have no data 3023 saying otherwise. 3024 3025 The spring 1988 transition was 1988-10-09, not 1988-10-02. 3026 The fall 1990 transition was 1990-03-11, not 1990-03-18. 3027 3028 Assume no UT offset change for Pacific/Easter on 1890-01-01, 3029 and omit all transitions on Pacific/Easter from 1942 through 1946 3030 since we have no data suggesting that they existed. 3031 3032 One more zone has been turned into a link, as it differed 3033 from an existing zone only for older timestamps. As usual, 3034 this change affects UT offsets in pre-1970 timestamps only. 3035 The zone's old contents have been moved to the 'backzone' file. 3036 The affected zone is America/Montreal. 3037 3038 Changes affecting commentary 3039 3040 Mention the TZUpdater tool. 3041 3042 Mention "The Time Now". (Thanks to Brandon Ramsey.) 3043 3044 3045 Release 2015b - 2015-03-19 23:28:11 -0700 3046 3047 Changes affecting future timestamps 3048 3049 Mongolia will start observing DST again this year, from the last 3050 Saturday in March at 02:00 to the last Saturday in September at 00:00. 3051 (Thanks to Ganbold Tsagaankhuu.) 3052 3053 Palestine will start DST on March 28, not March 27. Also, 3054 correct the fall 2014 transition from September 26 to October 24. 3055 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 3056 3057 Changes affecting past timestamps 3058 3059 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 3060 regression. (Thanks to Stuart Bishop for reporting the problem.) 3061 3062 Some more zones have been turned into links, when they differed 3063 from existing zones only for older timestamps. As usual, 3064 these changes affect UT offsets in pre-1970 timestamps only. 3065 Their old contents have been moved to the 'backzone' file. 3066 The affected zones are: America/Antigua, America/Cayman, 3067 Pacific/Midway, and Pacific/Saipan. 3068 3069 Changes affecting time zone abbreviations 3070 3071 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 3072 (Thanks to Hank W.) 3073 3074 Changes affecting code 3075 3076 Fix integer overflow bug in reference 'mktime' implementation. 3077 (Problem reported by Jrg Richter.) 3078 3079 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 3080 to be used in the same executable as standard-library time_t functions. 3081 (Problems reported by Bradley White.) 3082 3083 Changes affecting commentary 3084 3085 Cite the recent Mexican decree changing Quintana Roo's time zone. 3086 (Thanks to Carlos Ral Perasso.) 3087 3088 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 3089 3090 Update info about Mars time. 3091 3092 3093 Release 2015a - 2015-01-29 22:35:20 -0800 3094 3095 Changes affecting future timestamps 3096 3097 The Mexican state of Quintana Roo, represented by America/Cancun, 3098 will shift from Central Time with DST to Eastern Time without DST 3099 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 3100 3101 Chile will not change clocks in April or thereafter; its new standard time 3102 will be its old daylight saving time. This affects America/Santiago, 3103 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 3104 3105 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 3106 (Thanks to Tim Parenti.) 3107 3108 Changes affecting past timestamps 3109 3110 Iceland observed DST in 1919 and 1921, and its 1939 fallback 3111 transition was Oct. 29, not Nov. 29. Remove incorrect data from 3112 Shanks about time in Iceland between 1837 and 1908. 3113 3114 Some more zones have been turned into links, when they differed 3115 from existing zones only for older timestamps. As usual, 3116 these changes affect UT offsets in pre-1970 timestamps only. 3117 Their old contents have been moved to the 'backzone' file. 3118 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 3119 and Asia/Muscat. 3120 3121 Changes affecting code 3122 3123 tzalloc now scrubs time zone abbreviations compatibly with the way 3124 that tzset always has, by replacing invalid bytes with '_' and by 3125 shortening too-long abbreviations. 3126 3127 tzselect ports to POSIX awk implementations, no longer mishandles 3128 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 3129 settings to the user. (Thanks to Stefan Kuhn.) 3130 3131 Changes affecting build procedure 3132 3133 'make check' now checks for links to links in the data. 3134 One such link (for Africa/Asmera) has been fixed. 3135 (Thanks to Stephen Colebourne for pointing out the problem.) 3136 3137 Changes affecting commentary 3138 3139 The leapseconds file commentary now mentions the expiration date. 3140 (Problem reported by Martin Burnicki.) 3141 3142 Update Mexican Library of Congress URL. 3143 3144 3145 Release 2014j - 2014-11-10 17:37:11 -0800 3146 3147 Changes affecting current and future timestamps 3148 3149 Turks & Caicos' switch from US eastern time to UT -04 year-round 3150 did not occur on 2014-11-02 at 02:00. It's currently scheduled 3151 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 3152 3153 Changes affecting past timestamps 3154 3155 Many pre-1989 timestamps have been corrected for Asia/Seoul and 3156 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 3157 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 3158 longer guess that Pyongyang mimicked Seoul time after World War II, 3159 as this is politically implausible. 3160 3161 Some more zones have been turned into links, when they differed 3162 from existing zones only for older timestamps. As usual, 3163 these changes affect UT offsets in pre-1970 timestamps only. 3164 Their old contents have been moved to the 'backzone' file. 3165 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 3166 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 3167 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 3168 Indian/Mayotte. 3169 3170 Changes affecting commentary 3171 3172 The commentary is less enthusiastic about Shanks as a source, 3173 and is more careful to distinguish UT from UTC. 3174 3175 3176 Release 2014i - 2014-10-21 22:04:57 -0700 3177 3178 Changes affecting future timestamps 3179 3180 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 3181 (Thanks to Ken Rylander for the heads-up.) Guess that future 3182 years will use a similar pattern. 3183 3184 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 3185 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 3186 (Thanks to Kiley Walbom for the heads-up.) 3187 3188 Changes affecting time zone abbreviations 3189 3190 Since Belarus is not changing its clocks even though Moscow is, 3191 the time zone abbreviation in Europe/Minsk is changing from FET 3192 to its more traditional value MSK on 2014-10-26 at 01:00. 3193 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 3194 3195 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 3196 Indochina, to distinguish it better from ICT (+07). 3197 3198 Changes affecting past timestamps 3199 3200 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 3201 (thanks to Trn Ngc Qun for an indirect pointer to Trn Tin Bnh's 3202 authoritative book). Asia/Ho_Chi_Minh has been added to 3203 zone1970.tab, to give tzselect users in Vietnam two choices, 3204 since north and south Vietnam disagreed after our 1970 cutoff. 3205 3206 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 3207 they differed from existing zones only for older timestamps. As 3208 usual, these changes affect pre-1970 timestamps only. Their old 3209 contents have been moved to the 'backzone' file. 3210 3211 Changes affecting code 3212 3213 The time-related library functions now set errno on failure, and 3214 some crashes in the new tzalloc-related library functions have 3215 been fixed. (Thanks to Christos Zoulas for reporting most of 3216 these problems and for suggesting fixes.) 3217 3218 If USG_COMPAT is defined and the requested timestamp is standard time, 3219 the tz library's localtime and mktime functions now set the extern 3220 variable timezone to a value appropriate for that timestamp; and 3221 similarly for ALTZONE, daylight saving time, and the altzone variable. 3222 This change is a companion to the tzname change in 2014h, and is 3223 designed to make timezone and altzone more compatible with tzname. 3224 3225 The tz library's functions now set errno to EOVERFLOW if they fail 3226 because the result cannot be represented. ctime and ctime_r now 3227 return NULL and set errno when a timestamp is out of range, rather 3228 than having undefined behavior. 3229 3230 Some bugs associated with the new 2014g functions have been fixed. 3231 This includes a bug that largely incapacitated the new functions 3232 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 3233 It also includes some uses of uninitialized variables after tzalloc. 3234 The new code uses the standard type 'ssize_t', which the Makefile 3235 now gives porting advice about. 3236 3237 Changes affecting commentary 3238 3239 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 3240 3241 3242 Release 2014h - 2014-09-25 18:59:03 -0700 3243 3244 Changes affecting past timestamps 3245 3246 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 3247 3248 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 3249 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 3250 3251 Some more zones have been turned into links, when they differed 3252 from existing zones only for older timestamps. As usual, 3253 these changes affect UT offsets in pre-1970 timestamps only. 3254 Their old contents have been moved to the 'backzone' file. 3255 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 3256 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 3257 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 3258 3259 Changes affecting code 3260 3261 zdump -V and -v now output gmtoff= values on all platforms, 3262 not merely on platforms defining TM_GMTOFF. 3263 3264 The tz library's localtime and mktime functions now set tzname to a value 3265 appropriate for the requested timestamp, and zdump now uses this 3266 on platforms not defining TM_ZONE, fixing a 2014g regression. 3267 (Thanks to Tim Parenti for reporting the problem.) 3268 3269 The tz library no longer sets tzname if localtime or mktime fails. 3270 3271 zdump -c no longer mishandles transitions near year boundaries. 3272 (Thanks to Tim Parenti for reporting the problem.) 3273 3274 An access to uninitialized data has been fixed. 3275 (Thanks to Jrg Richter for reporting the problem.) 3276 3277 When THREAD_SAFE is defined, the code ports to the C11 memory model. 3278 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 3279 and two threads race to initialize data used by gmtime-like functions. 3280 (Thanks to Andy Heninger for reporting the problems.) 3281 3282 Changes affecting build procedure 3283 3284 'make check' now checks better for properly sorted data. 3285 3286 Changes affecting documentation and commentary 3287 3288 zdump's gmtoff=N output is now documented, and its isdst=D output 3289 is now documented to possibly output D values other than 0 or 1. 3290 3291 zdump -c's treatment of years is now documented to use the 3292 Gregorian calendar and Universal Time without leap seconds, 3293 and its behavior at cutoff boundaries is now documented better. 3294 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 3295 3296 Programs are now documented to use the proleptic Gregorian calendar. 3297 (Thanks to Alan Barrett for the suggestion.) 3298 3299 Fractional-second GMT offsets have been documented for civil time 3300 in 19th-century Chennai, Jakarta, and New York. 3301 3302 3303 Release 2014g - 2014-08-28 12:31:23 -0700 3304 3305 Changes affecting future timestamps 3306 3307 Turks & Caicos is switching from US eastern time to UT -04 3308 year-round, modeled as a switch on 2014-11-02 at 02:00. 3309 [As noted in 2014j, this switch was later delayed.] 3310 3311 Changes affecting past timestamps 3312 3313 Time in Russia or the USSR before 1926 or so has been corrected by 3314 a few seconds in the following zones: Asia/Irkutsk, 3315 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 3316 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 3317 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 3318 Vladimir Karpinsky.) 3319 3320 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 3321 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 3322 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 3323 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 3324 (Thanks to Stephen Colebourne for pointing to the decree.) 3325 3326 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 3327 3328 A new file 'backzone' contains data which may appeal to 3329 connoisseurs of old timestamps, although it is out of scope for 3330 the tz database, is often poorly sourced, and contains some data 3331 that is known to be incorrect. The new file is not recommended 3332 for ordinary use and its entries are not installed by default. 3333 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 3334 Isle of Man entries.) 3335 3336 Some more zones have been turned into links, when they differed 3337 from existing zones only for older timestamps. As usual, 3338 these changes affect UT offsets in pre-1970 timestamps only. 3339 Their old contents have been moved to the 'backzone' file. 3340 The affected zones are: Africa/Bangui, Africa/Brazzaville, 3341 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 3342 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 3343 3344 Changes affecting code 3345 3346 Unless NETBSD_INSPIRED is defined to 0, the tz library now 3347 supplies functions for creating and using objects that represent 3348 timezones. The new functions are tzalloc, tzfree, localtime_rz, 3349 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 3350 time2posix_z. They are intended for performance: for example, 3351 localtime_rz (unlike localtime_r) is trivially thread-safe without 3352 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 3353 functions, and to Alan Barrett and Jonathan Lennox for helping to 3354 debug the change.) 3355 3356 zdump now builds with the tz library unless USE_LTZ is defined to 0, 3357 This lets zdump use tz features even if the system library lacks them. 3358 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 3359 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 3360 3361 zdump now uses localtime_rz if available, as it's significantly faster, 3362 and it can help zdump better diagnose invalid timezone names. 3363 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 3364 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 3365 not available, zdump now uses localtime_r and tzset if available, 3366 as this is a bit cleaner and faster than plain localtime. Compile 3367 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 3368 lacks these two functions. 3369 3370 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 3371 Although not needed for tz's own applications, which are single-threaded, 3372 this supports POSIX better if the tz library is used in multithreaded apps. 3373 3374 Some crashes have been fixed when zdump or the tz library is given 3375 invalid or outlandish input. 3376 3377 The tz library no longer mishandles leap seconds on platforms with 3378 unsigned time_t in timezones that lack ordinary transitions after 1970. 3379 3380 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 3381 already defined, to make it easier to configure on common platforms. 3382 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 3383 3384 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 3385 assumes that reading uninitialized memory yields garbage values 3386 but does not cause other problems such as traps. 3387 3388 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 3389 more likely to guess right for ambiguous timestamps near 3390 transitions where tm_isdst does not change. 3391 3392 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 3393 strftime_l for compatibility with recent versions of POSIX. 3394 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 3395 to 1 on recent POSIX versions, and to 0 otherwise. 3396 3397 tzselect -c now uses a hybrid distance measure that works better 3398 in Africa. (Thanks to Alan Barrett for noting the problem.) 3399 3400 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 3401 or when time_tz is defined. 3402 3403 When HAVE_UTMPX_H is set the 'date' command now builds on systems 3404 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 3405 the date it updates the wtmpx file if _PATH_WTMPX is defined. 3406 This affects GNU/Linux and similar systems. 3407 3408 For easier maintenance later, some C code has been simplified, 3409 some lint has been removed, and the code has been tweaked so that 3410 plain 'make' is more likely to work. 3411 3412 The C type 'bool' is now used for boolean values, instead of 'int'. 3413 3414 The long-obsolete LOCALE_HOME code has been removed. 3415 3416 The long-obsolete 'gtime' function has been removed. 3417 3418 Changes affecting build procedure 3419 3420 'zdump' no longer links in ialloc.o, as it's not needed. 3421 3422 'make check_time_t_alternatives' no longer assumes GNU diff. 3423 3424 Changes affecting distribution tarballs 3425 3426 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 3427 the tzdata tarball instead of the tzcode tarball, since they help 3428 maintain the data. The NEWS and Theory files are now also 3429 distributed in the tzdata tarball, as they're relevant for data. 3430 (Thanks to Alan Barrett for pointing this out.) Also, the 3431 leapseconds.awk file is no longer distributed in the tzcode 3432 tarball, since it belongs in the tzdata tarball (where 2014f 3433 inadvertently also distributed it). 3434 3435 Changes affecting documentation and commentary 3436 3437 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 3438 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 3439 for debugging it.) 3440 3441 The man pages have been updated to use function prototypes, 3442 to document thread-safe variants like localtime_r, and to document 3443 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 3444 mktime_z. 3445 3446 The fields in Link lines have been renamed to be more descriptive 3447 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 3448 and LINK-TO has become LINK-NAME. 3449 3450 tz-link.htm mentions the IETF's tzdist working group; Windows 3451 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 3452 3453 Some broken URLs have been fixed in the commentary. (Thanks to 3454 Lester Caine.) 3455 3456 Commentary about Philippines DST has been updated, and commentary 3457 on pre-1970 time in India has been added. 3458 3459 3460 Release 2014f - 2014-08-05 17:42:36 -0700 3461 3462 Changes affecting future timestamps 3463 3464 Russia will subtract an hour from most of its time zones on 2014-10-26 3465 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 3466 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 3467 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 3468 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 3469 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 3470 (Europe/Samara) are not changing their clocks. The changed zones are 3471 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 3472 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 3473 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 3474 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 3475 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 3476 but not its UTC offset. Two zones are added: Asia/Chita (split 3477 from Asia/Yakutsk, and also with two hours subtracted) and 3478 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 3479 subtracted). (Thanks to Tim Parenti for much of the above.) 3480 3481 Changes affecting time zone abbreviations 3482 3483 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 3484 and similarly for the other Australian zones. That is, for eastern 3485 standard and daylight saving time the abbreviations are AEST and AEDT 3486 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 3487 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 3488 This change does not affect UT offsets, only time zone abbreviations. 3489 (Thanks to Rich Tibbett and many others.) 3490 3491 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 3492 effective 2014-10-26 at 02:00 local time. 3493 3494 The time zone abbreviation for Xinjiang Time (observed in rmqi) 3495 has been changed from URUT to XJT. (Thanks to Luther Ma.) 3496 3497 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 3498 Similarly, prefer EET/EEST for eastern European time in Russia. 3499 3500 Change time zone abbreviations in (western) Samoa to use "ST" and 3501 "DT" suffixes, as this is more likely to match common practice. 3502 Prefix "W" to (western) Samoa time when its standard-time offset 3503 disagrees with that of American Samoa. 3504 3505 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 3506 3507 Time zone abbreviations have been updated for Japan's two time 3508 zones used 1896-1937. JWST now stands for Western Standard 3509 Time, and JCST for Central Standard Time (formerly this was CJT). 3510 These abbreviations are now used for time in Korea, Taiwan, 3511 and Sakhalin while controlled by Japan. 3512 3513 Changes affecting past timestamps 3514 3515 China's five zones have been simplified to two, since the post-1970 3516 differences in the other three seem to have been imaginary. The 3517 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 3518 removed; backwards-compatibility links still work, albeit with 3519 different behaviors for timestamps before May 1980. Asia/Urumqi's 3520 1980 transition to UT +08 has been removed, so that it is now at 3521 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 3522 Treindl sent helpful translations of two papers by Guo Qingsheng.) 3523 3524 Some zones have been turned into links, when they differed from existing 3525 zones only for older UT offsets where data entries were likely invented. 3526 These changes affect UT offsets in pre-1970 timestamps only. This is 3527 similar to the change in release 2013e, except this time for western 3528 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 3529 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 3530 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 3531 Atlantic/St_Helena. This also affects the backwards-compatibility 3532 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 3533 Tim Parenti, and David Patte for reporting problems in earlier 3534 versions of this change.) 3535 3536 Asia/Shanghai's pre-standard-time UT offset has been changed from 3537 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 3538 transition to standard time has been changed from 1928 to 1901. 3539 3540 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 3541 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 3542 In 1946 it observed DST from 05-15 through 09-30; in 1947 3543 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 3544 (Thanks to Yu-Cheng Chuang.) 3545 3546 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 3547 3548 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 3549 10-03 at 00:00. (Thanks to Konstantin Hyppnen.) 3550 3551 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 3552 period from 1911 to 1950. 3553 3554 Pacific/Chatham has been changed to New Zealand standard time plus 3555 45 minutes for the period before 1957, reflecting a 1956 remark in 3556 the New Zealand parliament. 3557 3558 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 3559 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 3560 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 3561 not 04-06 at 02:00; and there was no DST in 1920. 3562 3563 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 3564 3565 Time in Russia before 1927 or so has been corrected by a few seconds in 3566 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 3567 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 3568 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 3569 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 3570 3571 Changes affecting data format 3572 3573 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 3574 The new file's extended format allows multiple country codes per zone. 3575 The older file is still installed but is deprecated; its format is 3576 not changing and it will still be distributed for a while, but new 3577 applications should use the new file. 3578 3579 The new file format simplifies maintenance of obscure locations. 3580 To test this, it adds coverage for the Crozet Islands and the 3581 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 3582 3583 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 3584 It is still ASCII now, but commentary about the switch has been added. 3585 The new file 'zone1970.tab' already uses UTF-8. 3586 3587 Changes affecting code 3588 3589 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 3590 is defined. (Thanks to Elliott Hughes for reporting the problem.) 3591 3592 'zic' no longer mishandles input when ignoring case in locales that 3593 are not compatible with English, e.g., unibyte Turkish locales when 3594 compiled with HAVE_GETTEXT. 3595 3596 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 3597 they no longer use ASCII '-' as if it were a dash. 3598 3599 'zic' now rejects output file names that contain '.' or '..' components. 3600 (Thanks to Tim Parenti for reporting the problem.) 3601 3602 'zic -v' now warns about output file names that do not follow 3603 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 3604 David Olson for starting the ball rolling on this.) 3605 3606 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 3607 3608 Changes affecting build procedure 3609 3610 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 3611 (Thanks to John Cochran.) 3612 3613 Changes affecting documentation and commentary 3614 3615 The 'Theory' file documents legacy names, the longstanding 3616 exceptions to the POSIX-inspired file name rules. 3617 3618 The 'zic' documentation clarifies the role of time types when 3619 interpreting dates. (Thanks to Arthur David Olson.) 3620 3621 Documentation and commentary now prefer UTF-8 to US-ASCII, 3622 allowing the use of proper accents in foreign words and names. 3623 Code and data have not changed because of this. (Thanks to 3624 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 3625 this.) 3626 3627 Non-HTML documentation and commentary now use plain-text URLs instead of 3628 HTML insertions, and are more consistent about bracketing URLs when they 3629 are not already surrounded by white space. (Thanks to suggestions by 3630 Steffen Nurpmeso.) 3631 3632 There is new commentary about Xujiahui Observatory, the five time-zone 3633 project in China from 1918 to 1949, timekeeping in Japanese-occupied 3634 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 3635 warlord Jin Shuren in the data. 3636 3637 Commentary about the coverage of each Russian zone has been standardized. 3638 (Thanks to Tim Parenti.) 3639 3640 There is new commentary about contemporary timekeeping in Ethiopia. 3641 3642 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 3643 3644 There is new commentary about time in Poland in 1919. 3645 3646 Proper credit has been given to DST inventor George Vernon Hudson. 3647 3648 Commentary about time in Metlakatla, AK and Resolute, NU has been 3649 improved, with a new source for the former. 3650 3651 In zone.tab, Pacific/Easter no longer mentions Salas y Gmez, as it 3652 is uninhabited. 3653 3654 Commentary about permanent Antarctic bases has been updated. 3655 3656 Several typos have been corrected. (Thanks to Tim Parenti for 3657 contributing some of these fixes.) 3658 3659 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 3660 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 3661 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 3662 (Thanks to a heads-up from Dirkjan Ochtman.) 3663 3664 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 3665 have been removed. These obsolescent US Naval Observatory entries were no 3666 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 3667 3668 3669 Release 2014e - 2014-06-12 21:53:52 -0700 3670 3671 Changes affecting near-future timestamps 3672 3673 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 3674 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 3675 switch to standard time at 24:00 the last Thursday before Ramadan, and 3676 back to DST at 00:00 the first Friday after Ramadan. 3677 3678 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 3679 to Milamber Space Network.) Guess that from 2015 on Morocco will 3680 temporarily switch to standard time at 03:00 the last Saturday before 3681 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 3682 3683 Changes affecting past timestamps 3684 3685 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 3686 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 3687 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 3688 in 1991. (Thanks to Hank W. for reporting the problems.) 3689 3690 Changes affecting commentary 3691 3692 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 3693 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 3694 removes stale pointers to World Time Explorer and WORLDTIME. 3695 3696 3697 Release 2014d - 2014-05-27 21:34:40 -0700 3698 3699 Changes affecting code 3700 3701 zic no longer generates files containing timestamps before the Big Bang. 3702 This works around GNOME glib bug 878 3703 <https://gitlab.gnome.org/GNOME/glib/issues/878> 3704 (Thanks to Leonardo Chiquitto for reporting the bug, and to 3705 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 3706 3707 Changes affecting documentation 3708 3709 tz-link.htm now mentions GNOME. 3710 3711 3712 Release 2014c - 2014-05-13 07:44:13 -0700 3713 3714 Changes affecting near-future timestamps 3715 3716 Egypt observes DST starting 2014-05-15 at 24:00. 3717 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 3718 Details have not been announced, except that DST will not be observed 3719 during Ramadan. Guess that DST will stop during the same Ramadan dates as 3720 Morocco, and that Egypt's future spring and fall transitions will be the 3721 same as 2010 when it last observed DST, namely April's last Friday at 3722 00:00 to September's last Thursday at 23:00 standard time. Also, guess 3723 that Ramadan transitions will be at 00:00 standard time. 3724 3725 Changes affecting code 3726 3727 zic now generates transitions for minimum time values, eliminating guesswork 3728 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 3729 3730 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 3731 3732 Changes affecting commentary and documentation 3733 3734 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 3735 3736 3737 Release 2014b - 2014-03-24 21:28:50 -0700 3738 3739 Changes affecting near-future timestamps 3740 3741 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 3742 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 3743 3744 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 3745 Bengt-Inge Larsson.) This is currently an approximation; a better version 3746 will require the zic and localtime fixes mentioned below, and the plan is 3747 to wait for a while until at least the zic fixes propagate. 3748 3749 Changes affecting code 3750 3751 'zic' and 'localtime' no longer reject locations needing four transitions 3752 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 3753 Also, 'zic' avoids some unlikely failures due to integer overflow. 3754 3755 Changes affecting build procedure 3756 3757 'make check' now detects Rule lines defined but never used. 3758 The NZAQ rules, an instance of this problem, have been removed. 3759 3760 Changes affecting commentary and documentation 3761 3762 Fix Tuesday/Thursday typo in description of time in Israel. 3763 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 3764 3765 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 3766 to Donald MacQueen.) Instead, the Microsoft Windows Store app 3767 library supports them. 3768 3769 Add comments about Johnston Island time in the 1960s. 3770 (Thanks to Lyle McElhaney.) 3771 3772 Morocco's 2014 DST start will be as predicted. 3773 (Thanks to Sebastien Willemijns.) 3774 3775 3776 Release 2014a - 2014-03-07 23:30:29 -0800 3777 3778 Changes affecting near-future timestamps 3779 3780 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 3781 the heads-up, and to Tim Parenti for simplifying the update.) 3782 3783 Changes affecting past timestamps 3784 3785 Fiji ended DST on 2014-01-19 at 02:00, not the previously scheduled 03:00. 3786 (Thanks to Steffen Thorsen.) 3787 3788 Ukraine switched from Moscow to Eastern European time on 1990-07-01 3789 (not 1992-01-01), and observed DST during the entire next winter. 3790 (Thanks to Vladimir in Moscow via Alois Treindl.) 3791 3792 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 3793 (Thanks to Avigdor Finkelstein.) 3794 3795 Changes affecting code 3796 3797 A uninitialized-storage bug in 'localtime' has been fixed. 3798 (Thanks to Logan Chien.) 3799 3800 Changes affecting the build procedure 3801 3802 The settings for 'make check_web' now default to Ubuntu 13.10. 3803 3804 Changes affecting commentary and documentation 3805 3806 The boundary of the US Pacific time zone is given more accurately. 3807 (Thanks to Alan Mintz.) 3808 3809 Chile's 2014 DST will be as predicted. (Thanks to Jos Miguel Garrido.) 3810 3811 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Ral Perasso.) 3812 3813 Better descriptions of countries with same time zone history as 3814 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 3815 3816 Several changes affect tz-link.htm, the main web page. 3817 3818 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 3819 David Braverman). 3820 3821 Mention xCal (Internet RFC 6321) and jCal. 3822 3823 Microsoft has some support for tz database names. 3824 3825 CLDR data formats include both XML and JSON. 3826 3827 Mention Maggiolo's map of solar vs standard time. 3828 (Thanks to Arthur David Olson.) 3829 3830 Mention TZ4Net. (Thanks to Matt Johnson.) 3831 3832 Mention the timezone-olson Haskell package. 3833 3834 Mention zeitverschiebung.net. (Thanks to Martin Jger.) 3835 3836 Remove moribund links to daylight-savings-time.info and to 3837 Simple Timer + Clocks. 3838 3839 Update two links. (Thanks to Oscar van Vlijmen.) 3840 3841 Fix some formatting glitches, e.g., remove random newlines from 3842 abbr elements' title attributes. 3843 3844 3845 Release 2013i - 2013-12-17 07:25:23 -0800 3846 3847 Changes affecting near-future timestamps: 3848 3849 Jordan switches back to standard time at 00:00 on December 20, 2013. 3850 The 2006-2011 transition schedule is planned to resume in 2014. 3851 (Thanks to Steffen Thorsen.) 3852 3853 Changes affecting past timestamps: 3854 3855 In 2004, Cuba began DST on March 28, not April 4. 3856 (Thanks to Steffen Thorsen.) 3857 3858 Changes affecting code 3859 3860 The compile-time flag NOSOLAR has been removed, as nowadays the 3861 benefit of slightly shrinking runtime table size is outweighed by the 3862 cost of disallowing potential future updates that exceed old limits. 3863 3864 Changes affecting documentation and commentary 3865 3866 The files solar87, solar88, and solar89 are no longer distributed. 3867 They were a negative experiment - that is, a demonstration that 3868 tz data can represent solar time only with some difficulty and error. 3869 Their presence in the distribution caused confusion, as Riyadh 3870 civil time was generally not solar time in those years. 3871 3872 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 3873 3874 3875 Release 2013h - 2013-10-25 15:32:32 -0700 3876 3877 Changes affecting current and future timestamps: 3878 3879 Libya has switched its UT offset back to +02 without DST, instead 3880 of +01 with DST. (Thanks to Even Scharning.) 3881 3882 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 3883 (Thanks to Gwillim Law.) 3884 3885 Changes affecting future timestamps: 3886 3887 Acre and (we guess) western Amazonas will switch from UT -04 to -05 3888 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 3889 (Thanks to Steffen Thorsen.) 3890 3891 Add entries for DST transitions in Morocco in the year 2038. 3892 This avoids some year-2038 glitches introduced in 2013g. 3893 (Thanks to Yoshito Umaoka for reporting the problem.) 3894 3895 Changes affecting API 3896 3897 The 'tzselect' command no longer requires the 'select' command, 3898 and should now work with /bin/sh on more platforms. It also works 3899 around a bug in BusyBox awk before version 1.21.0. (Thanks to 3900 Patrick 'P. J.' McDermott and Alan Barrett.) 3901 3902 Changes affecting code 3903 3904 Fix localtime overflow bugs with 32-bit unsigned time_t. 3905 3906 zdump no longer assumes sscanf returns maximal values on overflow. 3907 3908 Changes affecting the build procedure 3909 3910 The builder can specify which programs to use, if any, instead of 3911 'ar' and 'ranlib', and libtz.a is now built locally before being 3912 installed. (Thanks to Michael Forney.) 3913 3914 A dependency typo in the 'zdump' rule has been fixed. 3915 (Thanks to Andrew Paprocki.) 3916 3917 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 3918 work as specified by POSIX.2-1992 or later; this is portable nowadays. 3919 3920 'make clean' no longer removes 'leapseconds', since it's 3921 host-independent and is part of the distribution. 3922 3923 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 3924 3925 Changes affecting documentation and commentary 3926 3927 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 3928 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 3929 3930 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 3931 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 3932 longer maintained) and for old advisories. SOFA now does C. 3933 3934 Release 2013g - 2013-09-30 21:08:26 -0700 3935 3936 Changes affecting current and near-future timestamps 3937 3938 Morocco now observes DST from the last Sunday in March to the last 3939 Sunday in October, not April to September respectively. (Thanks 3940 to Steffen Thorsen.) 3941 3942 Changes affecting 'zic' 3943 3944 'zic' now runs on platforms that lack both hard links and symlinks. 3945 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 3946 Also, fix some bugs on platforms that lack hard links but have symlinks. 3947 3948 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 3949 to predict the far future, fixing a bug introduced in 2013e. 3950 3951 Changes affecting the build procedure 3952 3953 The 'leapseconds' file is again put into the tzdata tarball. 3954 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 3955 Matt Burgess and Ian Abbott.) The timestamps of these and other 3956 dependent files in tarballs are adjusted more consistently. 3957 3958 Changes affecting documentation and commentary 3959 3960 The README file is now part of the data tarball as well as the code. 3961 It now states that files are public domain unless otherwise specified. 3962 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 3963 Its details about the 1989 release moved to a place of honor near 3964 the end of NEWS. 3965 3966 3967 Release 2013f - 2013-09-24 23:37:36 -0700 3968 3969 Changes affecting near-future timestamps 3970 3971 Tocantins will very likely not observe DST starting this spring. 3972 (Thanks to Steffen Thorsen.) 3973 3974 Jordan will likely stay at UT +03 indefinitely, and will not fall 3975 back this fall. 3976 3977 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 3978 3979 Changes affecting API 3980 3981 The types of the global variables 'timezone' and 'altzone' (if present) 3982 have been changed back to 'long'. This is required for 'timezone' 3983 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 3984 These variables were originally 'long' in the tz code, but were 3985 mistakenly changed to 'time_t' in 1987; nobody reported the 3986 incompatibility until now. The difference matters on x32, where 3987 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 3988 3989 Changes affecting the build procedure 3990 3991 Avoid long strings in leapseconds.awk to work around a mawk bug. 3992 (Thanks to Cyril Baurand.) 3993 3994 Changes affecting documentation and commentary 3995 3996 New file 'NEWS' that contains release notes like this one. 3997 3998 Paraguay's law does not specify DST transition time; 00:00 is customary. 3999 (Thanks to Waldemar Villamayor-Venialbo.) 4000 4001 Minor capitalization fixes. 4002 4003 Changes affecting version-control only 4004 4005 The experimental GitHub repository now contains annotated and 4006 signed tags for recent releases, e.g., '2013e' for Release 2013e. 4007 Releases are tagged starting with 2012e; earlier releases were 4008 done differently, and tags would either not have a simple name or 4009 not exactly match what was released. 4010 4011 'make set-timestamps' is now simpler and a bit more portable. 4012 4013 4014 Release 2013e - 2013-09-19 23:50:04 -0700 4015 4016 Changes affecting near-future timestamps 4017 4018 This year Fiji will start DST on October 27, not October 20. 4019 (Thanks to David Wheeler for the heads-up.) For now, guess that 4020 Fiji will continue to spring forward the Sunday before the fourth 4021 Monday in October. 4022 4023 Changes affecting current and future time zone abbreviations 4024 4025 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 4026 time zone abbreviations since 1932. (Thanks to George Ziegler, 4027 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 4028 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 4029 Asia/Makassar, and Asia/Pontianak. 4030 4031 Use ART (UT -03, standard time), rather than WARST (also -03, but 4032 daylight saving time) for San Luis, Argentina since 2009. 4033 4034 Changes affecting Godthb timestamps after 2037 if version mismatch 4035 4036 Allow POSIX-like TZ strings where the transition time's hour can 4037 range from -167 through 167, instead of the POSIX-required 0 4038 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 4039 new Fiji rules. This is a more compact way to represent 4040 far-future timestamps for America/Godthab, America/Santiago, 4041 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 4042 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 4043 this change. (Derived from a suggestion by Arthur David Olson.) 4044 4045 Allow POSIX-like TZ strings where daylight saving time is in 4046 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 4047 Argentina Summer Time all year. This supports a more compact way 4048 to represent the 2013d data for America/Argentina/San_Luis. 4049 Because of the change for San Luis noted above this change does not 4050 affect the current data. (Thanks to Andrew Main (Zefram) for 4051 suggestions that improved this change.) 4052 4053 Where these two TZ changes take effect, there is a minor extension 4054 to the tz file format in that it allows new values for the 4055 embedded TZ-format string, and the tz file format version number 4056 has therefore been increased from 2 to 3 as a precaution. 4057 Version-2-based client code should continue to work as before for 4058 all timestamps before 2038. Existing version-2-based client code 4059 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 4060 files, and typically works in practice even for timestamps after 4061 2037; the only known exception is America/Godthab. 4062 4063 Changes affecting timestamps before 1970 4064 4065 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 4066 some errors before 1947. 4067 4068 Some zones have been turned into links, when they differ from existing 4069 zones only in older data entries that were likely invented or that 4070 differ only in LMT or transitions from LMT. These changes affect 4071 only timestamps before 1943. The affected zones are: 4072 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 4073 America/Grenada, America/Guadeloupe, America/Marigot, 4074 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 4075 America/St_Lucia, America/St_Thomas, America/St_Vincent, 4076 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 4077 confirming that the old Europe/Vaduz zone was wrong and the new 4078 link is better for WWII-era times.) 4079 4080 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 4081 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 4082 from 1890 to 1912. 4083 4084 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 4085 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 4086 to Alois Treindl.) 4087 4088 Change the date of the circa-1850 Zurich transition from 1849-09-12 4089 to 1853-07-16, overriding Shanks with data from Messerli about 4090 postal and telegraph time in Switzerland. 4091 4092 Changes affecting time zone abbreviations before 1970 4093 4094 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 4095 as Jakarta was called Batavia back then. 4096 4097 Changes affecting API 4098 4099 The 'zic' command now outputs a dummy transition when far-future 4100 data can't be summarized using a TZ string, and uses a 402-year 4101 window rather than a 400-year window. For the current data, this 4102 affects only the Asia/Tehran file. It does not affect any of the 4103 timestamps that this file represents, so zdump outputs the same 4104 information as before. (Thanks to Andrew Main (Zefram).) 4105 4106 The 'date' command has a new '-r' option, which lets you specify 4107 the integer time to display, a la FreeBSD. 4108 4109 The 'tzselect' command has two new options '-c' and '-n', which lets you 4110 select a zone based on latitude and longitude. 4111 4112 The 'zic' command's '-v' option now warns about constructs that 4113 require the new version-3 binary file format. (Thanks to Arthur 4114 David Olson for the suggestion.) 4115 4116 Support for floating-point time_t has been removed. 4117 It was always dicey, and POSIX no longer requires it. 4118 (Thanks to Eric Blake for suggesting to the POSIX committee to 4119 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 4120 Heninger, Arthur David Olson, and Alois Treindl, for reporting 4121 bugs and elucidating some of the corners of the old floating-point 4122 implementation.) 4123 4124 The signatures of 'offtime', 'timeoff', and 'gtime' have been 4125 changed back to the old practice of using 'long' to represent UT 4126 offsets. This had been inadvertently and mistakenly changed to 4127 'int_fast32_t'. (Thanks to Christos Zoulas.) 4128 4129 The code avoids undefined behavior on integer overflow in some 4130 more places, including gmtime, localtime, mktime and zdump. 4131 4132 Changes affecting the zdump utility 4133 4134 zdump now outputs "UT" when referring to Universal Time, not "UTC". 4135 "UTC" does not make sense for timestamps that predate the introduction 4136 of UTC, whereas "UT", a more generic term, does. (Thanks to Steve Allen 4137 for clarifying UT vs UTC.) 4138 4139 Data changes affecting behavior of tzselect and similar programs 4140 4141 Country code BQ is now called the more common name "Caribbean Netherlands" 4142 rather than the more official "Bonaire, St Eustatius & Saba". 4143 4144 Remove from zone.tab the names America/Montreal, America/Shiprock, 4145 and Antarctica/South_Pole, as they are equivalent to existing 4146 same-country-code zones for post-1970 timestamps. The data entries for 4147 these names are unchanged, so the names continue to work as before. 4148 4149 Changes affecting code internals 4150 4151 zic -c now runs way faster on 64-bit hosts when given large numbers. 4152 4153 zic now uses vfprintf to avoid allocating and freeing some memory. 4154 4155 tzselect now computes the list of continents from the data, 4156 rather than have it hard-coded. 4157 4158 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 4159 4160 Changes affecting the build procedure 4161 4162 The 'leapseconds' file is now generated automatically from a 4163 new file 'leap-seconds.list', which is a copy of 4164 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 4165 A new source file 'leapseconds.awk' implements this. 4166 The goal is simplification of the future maintenance of 'leapseconds'. 4167 4168 When building the 'posix' or 'right' subdirectories, if the 4169 subdirectory would be a copy of the default subdirectory, it is 4170 now made a symbolic link if that is supported. This saves about 4171 2 MB of file system space. 4172 4173 The links America/Shiprock and Antarctica/South_Pole have been 4174 moved to the 'backward' file. This affects only nondefault builds 4175 that omit 'backward'. 4176 4177 Changes affecting version-control only 4178 4179 .gitignore now ignores 'date'. 4180 4181 Changes affecting documentation and commentary 4182 4183 Changes to the 'tzfile' man page 4184 4185 It now mentions that the binary file format may be extended in 4186 future versions by appending data. 4187 4188 It now refers to the 'zdump' and 'zic' man pages. 4189 4190 Changes to the 'zic' man page 4191 4192 It lists conditions that elicit a warning with '-v'. 4193 4194 It says that the behavior is unspecified when duplicate names 4195 are given, or if the source of one link is the target of another. 4196 4197 Its examples are updated to match the latest data. 4198 4199 The definition of white space has been clarified slightly. 4200 (Thanks to Michael Deckers.) 4201 4202 Changes to the 'Theory' file 4203 4204 There is a new section about the accuracy of the tz database, 4205 describing the many ways that errors can creep in, and 4206 explaining why so many of the pre-1970 timestamps are wrong or 4207 misleading (thanks to Steve Allen, Lester Caine, and Garrett 4208 Wollman for discussions that contributed to this). 4209 4210 The 'Theory' file describes LMT better (this follows a 4211 suggestion by Guy Harris). 4212 4213 It refers to the 2013 edition of POSIX rather than the 2004 edition. 4214 4215 It's mentioned that excluding 'backward' should not affect the 4216 other data, and it suggests at least one zone.tab name per 4217 inhabited country (thanks to Stephen Colebourne). 4218 4219 Some longstanding restrictions on names are documented, e.g., 4220 'America/New_York' precludes 'America/New_York/Bronx'. 4221 4222 It gives more reasons for the 1970 cutoff. 4223 4224 It now mentions which time_t variants are supported, such as 4225 signed integer time_t. (Thanks to Paul Goyette for reporting 4226 typos in an experimental version of this change.) 4227 4228 (Thanks to Philip Newton for correcting typos in these changes.) 4229 4230 Documentation and commentary is more careful to distinguish UT in 4231 general from UTC in particular. (Thanks to Steve Allen.) 4232 4233 Add a better source for the Zurich 1894 transition. 4234 (Thanks to Pierre-Yves Berger.) 4235 4236 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 4237 4238 4239 Release 2013d - 2013-07-05 07:38:01 -0700 4240 4241 Changes affecting future timestamps: 4242 4243 Morocco's midsummer transitions this year are July 7 and August 10, 4244 not July 9 and August 8. (Thanks to Andrew Paprocki.) 4245 4246 Israel now falls back on the last Sunday of October. 4247 (Thanks to Ephraim Silverberg.) 4248 4249 Changes affecting past timestamps: 4250 4251 Specify Jerusalem's location more precisely; this changes the pre-1880 4252 times by 2 s. 4253 4254 Changing affecting metadata only: 4255 4256 Fix typos in the entries for country codes BQ and SX. 4257 4258 Changes affecting code: 4259 4260 Rework the code to fix a bug with handling Australia/Macquarie on 4261 32-bit hosts (thanks to Arthur David Olson). 4262 4263 Port to platforms like NetBSD, where time_t can be wider than long. 4264 4265 Add support for testing time_t types other than the system's. 4266 Run 'make check_time_t_alternatives' to try this out. 4267 Currently, the tests fail for unsigned time_t; 4268 this should get fixed at some point. 4269 4270 Changes affecting documentation and commentary: 4271 4272 Deemphasize the significance of national borders. 4273 4274 Update the zdump man page. 4275 4276 Remove obsolete NOID comment (thanks to Denis Excoffier). 4277 4278 Update several URLs and comments in the web pages. 4279 4280 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 4281 4282 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 4283 4284 4285 Release 2013c - 2013-04-19 16:17:40 -0700 4286 4287 Changes affecting current and future timestamps: 4288 4289 Palestine observed DST starting March 29, 2013. (Thanks to 4290 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 4291 with the predicted rules being the last Thursday in March at 24:00 4292 to the first Friday on or after September 21 at 01:00. 4293 4294 Assume that the recent change to Paraguay's DST rules is permanent, 4295 by moving the end of DST to the 4th Sunday in March every year. 4296 (Thanks to Carlos Ral Perasso.) 4297 4298 Changes affecting past timestamps: 4299 4300 Fix some historical data for Palestine to agree with that of 4301 timeanddate.com, as follows: 4302 4303 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 4304 00:00 Apr 1. 4305 4306 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 4307 02:00. 4308 4309 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 4310 4311 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 4312 4313 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 4314 4315 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 4316 4317 Fix times of habitation for Macquarie to agree with the Tasmania 4318 Parks & Wildlife Service history, which indicates that permanent 4319 habitation was 1899-1919 and 1948 on. 4320 4321 Changing affecting metadata only: 4322 4323 Macquarie Island is politically part of Australia, not Antarctica. 4324 (Thanks to Tobias Conradi.) 4325 4326 Sort Macquarie more consistently with other parts of Australia. 4327 (Thanks to Tim Parenti.) 4328 4329 4330 Release 2013b - 2013-03-10 22:33:40 -0700 4331 4332 Changes affecting current and future timestamps: 4333 4334 Haiti uses US daylight-saving rules this year, and presumably future years. 4335 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 4336 4337 Paraguay will end DST on March 24 this year. 4338 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 4339 4340 Morocco does not observe DST during Ramadan; 4341 try to predict Ramadan in Morocco as best we can. 4342 (Thanks to Erik Homoet for the heads-up.) 4343 4344 Changes affecting commentary: 4345 4346 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 4347 Update URL for Solaris. Mention Internet RFC 6557. 4348 Update Internet RFCs 2445->5545, 2822->5322. 4349 Switch from FTP to HTTP for Internet RFCs. 4350 4351 4352 Release 2013a - 2013-02-27 09:20:35 -0800 4353 4354 Change affecting binary data format: 4355 4356 The zone offset at the end of version-2-format zone files is now 4357 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 4358 4359 Changes affecting current and future timestamps: 4360 4361 Chile's 2013 rules, and we guess rules for 2014 and later, will be 4362 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 4363 (Thanks to Steffen Thorsen and Robert Elz.) 4364 4365 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 4366 (Thanks to Tobias Conradi and Arthur David Olson.) 4367 4368 Many changes affect historical timestamps before 1940. 4369 These were deduced from: Milne J. Civil time. Geogr J. 1899 4370 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 4371 4372 Changes affecting the code: 4373 4374 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 4375 the data). (Thanks to Arthur David Olson.) 4376 4377 Fix localtime bug when time_t is unsigned and data files were generated 4378 by a signed time_t system. (Thanks to Doug Bailey for reporting and 4379 to Arthur David Olson for fixing.) 4380 4381 Allow the email address for bug reports to be set by the packager. 4382 The default is tz (a] iana.org, as before. (Thanks to Joseph S. Myers.) 4383 4384 Update HTML checking to be compatible with Ubuntu 12.10. 4385 4386 Check that files are a safe subset of ASCII. At some point we may 4387 relax this requirement to a safe subset of UTF-8. Without the 4388 check, some non-UTF-8 encodings were leaking into the distribution. 4389 4390 Commentary changes: 4391 4392 Restore a comment about copyright notices that was inadvertently deleted. 4393 (Thanks to Arthur David Olson.) 4394 4395 Improve the commentary about which districts observe what times 4396 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 4397 4398 Add web page links to tz.js. 4399 4400 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 4401 4402 4403 Release 2012j - 2012-11-12 18:34:49 -0800 4404 4405 Libya moved to CET this weekend, but with DST planned next year. 4406 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 4407 4408 Signatures now have the extension .asc, not .sign, as that's more 4409 standard. (Thanks to Phil Pennock.) 4410 4411 The output of 'zdump --version', and of 'zic --version', now 4412 uses a format that is more typical for --version. 4413 (Thanks to Joseph S. Myers.) 4414 4415 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 4416 now uses tz (a] iana.org rather than the old elsie address. 4417 4418 zic -v now complains about abbreviations that are less than 3 4419 or more than 6 characters, as per POSIX. Formerly, it checked 4420 for abbreviations that were more than 3. 4421 4422 'make public' no longer puts its temporary directory under /tmp, 4423 and uses the just-built zic rather than the system zic. 4424 4425 Various fixes to documentation and commentary. 4426 4427 4428 Release 2012i - 2012-11-03 12:57:09 -0700 4429 4430 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 4431 4432 Linker flags can now be specified via LDFLAGS. 4433 AWK now defaults to 'awk', not 'nawk'. 4434 The shell in tzselect now defaults to /bin/bash, but this can 4435 be overridden by specifying KSHELL. 4436 The main web page now mentions the unofficial GitHub repository. 4437 (Thanks to Mike Frysinger.) 4438 4439 Tarball signatures can now be built by running 'make signatures'. 4440 There are also new makefile rules 'tarballs', 'check_public', and 4441 separate makefile rules for each tarball and signature file. 4442 A few makefile rules are now more portable to strict POSIX. 4443 4444 The main web page now lists the canonical IANA URL. 4445 4446 4447 Release 2012h - 2012-10-26 22:49:10 -0700 4448 4449 Bahia no longer has DST. (Thanks to Kelley Cook.) 4450 4451 Tocantins has DST. (Thanks to Rodrigo Severo.) 4452 4453 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 4454 4455 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 4456 4457 Web page updates. 4458 4459 More C modernization, except that at Arthur David Olson's suggestion 4460 the instances of 'register' were kept. 4461 4462 4463 Release 2012g - 2012-10-17 20:59:45 -0700 4464 4465 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 4466 4467 Palestine fall 2012. (Thanks to Steffen Thorsen.) 4468 4469 Assume C89. 4470 4471 To attack the version-number problem, this release ships the file 4472 'Makefile' (which contains the release number) in both the tzcode and 4473 the tzdata tarballs. The two Makefiles are identical, and should be 4474 identical in any matching pair of tarballs, so it shouldn't matter 4475 which order you extract the tarballs. Perhaps we can come up with a 4476 better version-number scheme at some point; this scheme does have the 4477 virtue of not adding more files. 4478 4479 4480 Release 2012f - 2012-09-12 23:17:03 -0700 4481 4482 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 4483 20 this year. (Thanks to Steffen Thorsen.) 4484 4485 4486 Release 2012e - 2012-08-02 20:44:55 -0700 4487 4488 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 4489 (Thanks to Steffen Thorsen.) 4490 4491 * Use a single version number for both code and data. 4492 4493 * .gitignore: New file. 4494 4495 * Remove trailing white space. 4496 4497 4498 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 4499 4500 Changes for Morocco's timestamps, which take effect in a couple of 4501 hours, along with infrastructure changes to accommodate how the tz 4502 code and data are released on IANA. 4503 4504 4505 Release data2012c - 2012-03-27 12:17:25 -0400 4506 4507 africa 4508 Summer time changes for Morocco (to start late April 2012) 4509 4510 asia 4511 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 4512 4513 northamerica 4514 Haiti following US/Canada rules for 2012 (and we're assuming, 4515 for now anyway, for the future). 4516 4517 4518 Release 2012b - 2012-03-02 12:29:15 +0700 4519 4520 There is just one change to tzcode2012b (compared with 2012a): 4521 the Makefile that was accidentally included with 2012a has been 4522 replaced with the version that should have been there, which is 4523 identical with the previous version (from tzcode2011i). 4524 4525 There are just two changes in tzdata2012b compared with 2012a. 4526 4527 Most significantly, summer time in Cuba has been delayed 3 weeks 4528 (now starts April 1 rather than March 11). Since Mar 11 (the old start 4529 date, as listed in 2012a) is just a little over a week away, this 4530 change is urgent. 4531 4532 Less importantly, an excess tab in one of the changes in zone.tab 4533 in 2012a has been removed. 4534 4535 4536 Release 2012a - 2012-03-01 18:28:10 +0700 4537 4538 The changes in tzcode2012a (compared to the previous version, 2011i) 4539 are entirely to the README and tz-art.htm and tz-link.htm files, if 4540 none of those concern you, you can ignore the code update. The changes 4541 reflect the changed addresses for the mailing list and the code and 4542 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 4543 has been added to tz-link.htm). 4544 4545 In tzdata2012a (compared to the previous release, which was 2011n) 4546 the major changes are: 4547 Chile 2011/2012 and 2012/2013 summer time date adjustments. 4548 Falkland Islands onto permanent summer time (we're assuming for the 4549 foreseeable future, though 2012 is all we're fairly certain of.) 4550 Armenia has abolished Summer Time. 4551 Tokelau jumped the International Date Line back last December 4552 (just the same as their near neighbour, Samoa). 4553 America/Creston is a new zone for a small area of British Columbia 4554 There will be a leapsecond 2012-06-30 23:59:60 UTC. 4555 4556 Other minor changes are: 4557 Corrections to 1918 Canadian summer time end dates. 4558 Updated URL for UK time zone history (in comments) 4559 A few typos in Le Corre's list of free French place names (comments) 4560 4561 4562 Release data2011n - 2011-10-30 14:57:54 +0700 4563 4564 There are three changes of note - most urgently, Cuba (America/Havana) 4565 has extended summer time by two weeks, now to end on Nov 13, rather than 4566 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 4567 (Europe/Tiraspol) decided not to split from the rest of Moldova after 4568 all, and consequently that zone has been removed (again) and reinstated 4569 in the "backward" file as a link to Europe/Chisinau. And third, the 4570 end date for Fiji's summer time this summer was moved forward from the 4571 earlier planned Feb 26, to Jan 22. 4572 4573 Apart from that, Moldova (MD) returns to a single entry in zone.tab 4574 (and the incorrect syntax that was in the 2011m version of that file 4575 is so fixed - it would have been fixed in a different way had this 4576 change not happened - that's the "missing" sccs version id). 4577 4578 4579 Release data2011m - 2011-10-24 21:42:16 +0700 4580 4581 In particular, the typos in comments in the data (2011-11-17 should have 4582 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 4583 Tim Parenti noted) have been fixed, and the change for Ukraine has been 4584 made in all 4 Ukrainian zones, rather than just Europe/Kiev 4585 (again, thanks to Tim Parenti, and also Denys Gavrysh). 4586 4587 In addition, I added Europe/Tiraspol to zone.tab. 4588 4589 This time, all the files have new version numbers... (including the files 4590 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 4591 version numbers there...) 4592 4593 4594 Release data2011l - 2011-10-10 11:15:43 +0700 4595 4596 There are just 2 changes that cause different generated tzdata files from 4597 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 4598 is included, but commented out. Compared with the diff I sent out last week, 4599 this version also includes attributions for the sources for the changes 4600 (in much the same format as ado used, but the html tags have not been 4601 checked, verified, or used in any way at all, so if there are errors there, 4602 please let me know.) 4603 4604 4605 Release data2011k - 2011-09-20 17:54:03 -0400 4606 4607 [not summarized] 4608 4609 4610 Release data2011j - 2011-09-12 09:22:49 -0400 4611 4612 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 4613 Tanzania); there are also two spelling corrections to comments in 4614 the australasia file (with thanks to Christos Zoulas). 4615 4616 4617 Release 2011i - 2011-08-29 05:56:32 -0400 4618 4619 [not summarized] 4620 4621 4622 Release data2011h - 2011-06-15 18:41:48 -0400 4623 4624 Russia and Curaao changes 4625 4626 4627 Release 2011g - 2011-04-25 09:07:22 -0400 4628 4629 update the rules for Egypt to reflect its abandonment of DST this year 4630 4631 4632 Release 2011f - 2011-04-06 17:14:53 -0400 4633 4634 [not summarized] 4635 4636 4637 Release 2011e - 2011-03-31 16:04:38 -0400 4638 4639 Morocco, Chile, and tz-link changes 4640 4641 4642 Release 2011d - 2011-03-14 09:18:01 -0400 4643 4644 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 4645 4646 4647 Release 2011c - 2011-03-07 09:30:09 -0500 4648 4649 These do affect current timestamps in Chile and Annette Island, Canada. 4650 4651 4652 Release 2011b - 2011-02-07 08:44:50 -0500 4653 4654 [not summarized] 4655 4656 4657 Release 2011a - 2011-01-24 10:30:16 -0500 4658 4659 [not summarized] 4660 4661 4662 Release data2010o - 2010-11-01 09:18:23 -0400 4663 4664 change to the end of DST in Fiji in 2011 4665 4666 4667 Release 2010n - 2010-10-25 08:19:17 -0400 4668 4669 [not summarized] 4670 4671 4672 Release 2010m - 2010-09-27 09:24:48 -0400 4673 4674 Hong Kong, Vostok, and zic.c changes 4675 4676 4677 Release 2010l - 2010-08-16 06:57:25 -0400 4678 4679 [not summarized] 4680 4681 4682 Release 2010k - 2010-07-26 10:42:27 -0400 4683 4684 [not summarized] 4685 4686 4687 Release 2010j - 2010-05-10 09:07:48 -0400 4688 4689 changes for Baha de Banderas and for version naming 4690 4691 4692 Release data2010i - 2010-04-16 18:50:45 -0400 4693 4694 the end of DST in Morocco on 2010-08-08 4695 4696 4697 Release data2010h - 2010-04-05 09:58:56 -0400 4698 4699 [not summarized] 4700 4701 4702 Release data2010g - 2010-03-24 11:14:53 -0400 4703 4704 [not summarized] 4705 4706 4707 Release 2010f - 2010-03-22 09:45:46 -0400 4708 4709 [not summarized] 4710 4711 4712 Release data2010e - 2010-03-08 14:24:27 -0500 4713 4714 corrects the Dhaka bug found by Danvin Ruangchan 4715 4716 4717 Release data2010d - 2010-03-06 07:26:01 -0500 4718 4719 [not summarized] 4720 4721 4722 Release 2010c - 2010-03-01 09:20:58 -0500 4723 4724 changes including KRE's suggestion for earlier initialization of 4725 "goahead" and "goback" structure elements 4726 4727 4728 Release code2010a - 2010-02-16 10:40:04 -0500 4729 4730 [not summarized] 4731 4732 4733 Release data2010b - 2010-01-20 12:37:01 -0500 4734 4735 Mexico changes 4736 4737 4738 Release data2010a - 2010-01-18 08:30:04 -0500 4739 4740 changes to Dhaka 4741 4742 4743 Release data2009u - 2009-12-26 08:32:28 -0500 4744 4745 changes to DST in Bangladesh 4746 4747 4748 Release 2009t - 2009-12-21 13:24:27 -0500 4749 4750 [not summarized] 4751 4752 4753 Release data2009s - 2009-11-14 10:26:32 -0500 4754 4755 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 4756 4757 4758 Release 2009r - 2009-11-09 10:10:31 -0500 4759 4760 "antarctica" and "tz-link.htm" changes 4761 4762 4763 Release 2009q - 2009-11-02 09:12:40 -0500 4764 4765 with two corrections as reported by Eric Muller and Philip Newton 4766 4767 4768 Release data2009p - 2009-10-23 15:05:27 -0400 4769 4770 Argentina (including San Luis) changes (with the correction from 4771 Mariano Absatz) 4772 4773 4774 Release data2009o - 2009-10-14 16:49:38 -0400 4775 4776 Samoa (commentary only), Pakistan, and Bangladesh changes 4777 4778 4779 Release data2009n - 2009-09-22 15:13:38 -0400 4780 4781 added commentary for Argentina and a change to the end of DST in 4782 2009 in Pakistan 4783 4784 4785 Release data2009m - 2009-09-03 10:23:43 -0400 4786 4787 Samoa and Palestine changes 4788 4789 4790 Release data2009l - 2009-08-14 09:13:07 -0400 4791 4792 Samoa (comments only) and Egypt 4793 4794 4795 Release 2009k - 2009-07-20 09:46:08 -0400 4796 4797 [not summarized] 4798 4799 4800 Release data2009j - 2009-06-15 06:43:59 -0400 4801 4802 Bangladesh change (with a short turnaround since the DST change is 4803 impending) 4804 4805 4806 Release 2009i - 2009-06-08 09:21:22 -0400 4807 4808 updating for DST in Bangladesh this year 4809 4810 4811 Release 2009h - 2009-05-26 09:19:14 -0400 4812 4813 [not summarized] 4814 4815 4816 Release data2009g - 2009-04-20 16:34:07 -0400 4817 4818 Cairo 4819 4820 4821 Release data2009f - 2009-04-10 11:00:52 -0400 4822 4823 correct DST in Pakistan 4824 4825 4826 Release 2009e - 2009-04-06 09:08:11 -0400 4827 4828 [not summarized] 4829 4830 4831 Release 2009d - 2009-03-23 09:38:12 -0400 4832 4833 Morocco, Tunisia, Argentina, and American Astronomical Society changes 4834 4835 4836 Release data2009c - 2009-03-16 09:47:51 -0400 4837 4838 change to the start of Cuban DST 4839 4840 4841 Release 2009b - 2009-02-09 11:15:22 -0500 4842 4843 [not summarized] 4844 4845 4846 Release 2009a - 2009-01-21 10:09:39 -0500 4847 4848 [not summarized] 4849 4850 4851 Release data2008i - 2008-10-21 12:10:25 -0400 4852 4853 southamerica and zone.tab files, with Argentina DST rule changes and 4854 United States zone reordering and recommenting 4855 4856 4857 Release 2008h - 2008-10-13 07:33:56 -0400 4858 4859 [not summarized] 4860 4861 4862 Release 2008g - 2008-10-06 09:03:18 -0400 4863 4864 Fix a broken HTML anchor and update Brazil's DST transitions; 4865 there's also a slight reordering of information in tz-art.htm. 4866 4867 4868 Release data2008f - 2008-09-09 22:33:26 -0400 4869 4870 [not summarized] 4871 4872 4873 Release 2008e - 2008-07-28 14:11:17 -0400 4874 4875 changes by Arthur David Olson and Jesper Nrgaard Welen 4876 4877 4878 Release data2008d - 2008-07-07 09:51:38 -0400 4879 4880 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 4881 4882 4883 Release data2008c - 2008-05-19 17:48:03 -0400 4884 4885 Pakistan, Morocco, and Mongolia 4886 4887 4888 Release data2008b - 2008-03-24 08:30:59 -0400 4889 4890 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 4891 link provided 4892 4893 4894 Release 2008a - 2008-03-08 05:42:16 -0500 4895 4896 [not summarized] 4897 4898 4899 Release 2007k - 2007-12-31 10:25:22 -0500 4900 4901 most importantly, changes to the "southamerica" file based on 4902 Argentina's readoption of daylight saving time 4903 4904 4905 Release 2007j - 2007-12-03 09:51:01 -0500 4906 4907 1. eliminate the "P" (parameter) macro; 4908 4909 2. the "noncontroversial" changes circulated on the time zone 4910 mailing list (less the changes to "logwtmp.c"); 4911 4912 3. eliminate "too many transition" errors when "min" is used in time 4913 zone rules; 4914 4915 4. changes by Paul Eggert (including updated information for Venezuela). 4916 4917 4918 Release data2007i - 2007-10-30 10:28:11 -0400 4919 4920 changes for Cuba and Syria 4921 4922 4923 Release 2007h - 2007-10-01 10:05:51 -0400 4924 4925 changes by Paul Eggert, as well as an updated link to the ICU 4926 project in tz-link.htm 4927 4928 4929 Release 2007g - 2007-08-20 10:47:59 -0400 4930 4931 changes by Paul Eggert 4932 4933 The "leapseconds" file has been updated to incorporate the most 4934 recent International Earth Rotation and Reference Systems Service 4935 (IERS) bulletin. 4936 4937 There's an addition to tz-art.htm regarding the television show "Medium". 4938 4939 4940 Release 2007f - 2007-05-07 10:46:46 -0400 4941 4942 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 4943 Zealand) 4944 4945 changes to zic.c to allow hour values greater than 24 (along with 4946 Paul's improved time value overflow checking) 4947 4948 4949 Release 2007e - 2007-04-02 10:11:52 -0400 4950 4951 Syria and Honduras changes by Paul Eggert 4952 4953 zic.c variable renaming changes by Arthur David Olson 4954 4955 4956 Release 2007d - 2007-03-20 08:48:30 -0400 4957 4958 changes by Paul Eggert 4959 4960 the elimination of white space at the ends of lines 4961 4962 4963 Release 2007c - 2007-02-26 09:09:37 -0500 4964 4965 changes by Paul Eggert 4966 4967 4968 Release 2007b - 2007-02-12 09:34:20 -0500 4969 4970 Paul Eggert's proposed change to the quotation handling logic in zic.c. 4971 4972 changes to the commentary in "leapseconds" reflecting the IERS 4973 announcement that there is to be no positive leap second at the end 4974 of June 2007. 4975 4976 4977 Release 2007a - 2007-01-08 12:28:29 -0500 4978 4979 changes by Paul Eggert 4980 4981 Derick Rethans's Asmara change 4982 4983 Oscar van Vlijmen's Easter Island local mean time change 4984 4985 symbolic link changes 4986 4987 4988 Release 2006p - 2006-11-27 08:54:27 -0500 4989 4990 changes by Paul Eggert 4991 4992 4993 Release 2006o - 2006-11-06 09:18:07 -0500 4994 4995 changes by Paul Eggert 4996 4997 4998 Release 2006n - 2006-10-10 11:32:06 -0400 4999 5000 changes by Paul Eggert 5001 5002 5003 Release 2006m - 2006-10-02 15:32:35 -0400 5004 5005 changes for Uruguay, Palestine, and Egypt by Paul Eggert 5006 5007 (minimalist) changes to zic.8 to clarify "until" information 5008 5009 5010 Release data2006l - 2006-09-18 12:58:11 -0400 5011 5012 Paul's best-effort work on this coming weekend's Egypt time change 5013 5014 5015 Release 2006k - 2006-08-28 12:19:09 -0400 5016 5017 changes by Paul Eggert 5018 5019 5020 Release 2006j - 2006-08-21 09:56:32 -0400 5021 5022 changes by Paul Eggert 5023 5024 5025 Release code2006i - 2006-08-07 12:30:55 -0400 5026 5027 localtime.c fixes 5028 5029 Ken Pizzini's conversion script 5030 5031 5032 Release code2006h - 2006-07-24 09:19:37 -0400 5033 5034 adds public domain notices to four files 5035 5036 includes a fix for transition times being off by a second 5037 5038 adds a new recording to the "arts" file (information courtesy Colin Bowern) 5039 5040 5041 Release 2006g - 2006-05-08 17:18:09 -0400 5042 5043 northamerica changes by Paul Eggert 5044 5045 5046 Release 2006f - 2006-05-01 11:46:00 -0400 5047 5048 a missing version number problem is fixed (with thanks to Bradley 5049 White for catching the problem) 5050 5051 5052 Release 2006d - 2006-04-17 14:33:43 -0400 5053 5054 changes by Paul Eggert 5055 5056 added new items to tz-arts.htm that were found by Paul 5057 5058 5059 Release 2006c - 2006-04-03 10:09:32 -0400 5060 5061 two sets of data changes by Paul Eggert 5062 5063 a fencepost error fix in zic.c 5064 5065 changes to zic.c and the "europe" file to minimize differences 5066 between output produced by the old 32-bit zic and the new 64-bit 5067 version 5068 5069 5070 Release 2006b - 2006-02-20 10:08:18 -0500 5071 [tz32code2006b + tz64code2006b + tzdata2006b] 5072 5073 64-bit code 5074 5075 All SCCS IDs were bumped to "8.1" for this release. 5076 5077 5078 Release 2006a - 2006-01-30 08:59:31 -0500 5079 5080 changes by Paul Eggert (in particular, Indiana time zone moves) 5081 5082 an addition to the zic manual page to describe how special-case 5083 transitions are handled 5084 5085 5086 Release 2005r - 2005-12-27 09:27:13 -0500 5087 5088 Canadian changes by Paul Eggert 5089 5090 They also add "<pre>" directives to time zone data files and reflect 5091 changes to warning message logic in "zdump.c" (but with calls to 5092 "gettext" kept unbundled at the suggestion of Ken Pizzini). 5093 5094 5095 Release 2005q - 2005-12-13 09:17:09 -0500 5096 5097 Nothing earth-shaking here: 5098 1. Electronic mail addresses have been removed. 5099 2. Casts of the return value of exit have been removed. 5100 3. Casts of the argument of is.* macros have been added. 5101 4. Indentation in one section of zic.c has been fixed. 5102 5. References to dead URLs in the data files have been dealt with. 5103 5104 5105 Release 2005p - 2005-12-05 10:30:53 -0500 5106 5107 "systemv", "tz-link.htm", and "zdump.c" changes 5108 (less the casts of arguments to the is* macros) 5109 5110 5111 Release 2005o - 2005-11-28 10:55:26 -0500 5112 5113 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 5114 5115 zdump.c lint fixes by Arthur David Olson 5116 5117 5118 Release 2005n - 2005-10-03 09:44:09 -0400 5119 5120 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 5121 et al. changes) 5122 5123 5124 Release 2005m - 2005-08-29 12:15:40 -0400 5125 5126 changes by Paul Eggert (with a small tweak to the tz-art change) 5127 5128 a declaration of an unused variable has been removed from zdump.c 5129 5130 5131 Release 2005l - 2005-08-22 12:06:39 -0400 5132 5133 changes by Paul Eggert 5134 5135 overflow/underflow checks by Arthur David Olson, minus changes to 5136 the "Theory" file about the pending addition of 64-bit data (I grow 5137 less confident of the changes being accepted with each passing day, 5138 and the changes no longer increase the data files nine-fold--there's 5139 less than a doubling in size by my local Sun's reckoning) 5140 5141 5142 Release 2005k - 2005-07-14 14:14:24 -0400 5143 5144 The "leapseconds" file has been edited to reflect the recently 5145 announced leap second at the end of 2005. 5146 5147 I've also deleted electronic mail addresses from the files as an 5148 anti-spam measure. 5149 5150 5151 Release 2005j - 2005-06-13 14:34:13 -0400 5152 5153 These reflect changes to limit the length of time zone abbreviations 5154 and the characters used in those abbreviations. 5155 5156 There are also changes to handle POSIX-style "quoted" timezone 5157 environment variables. 5158 5159 The changes were circulated on the time zone mailing list; the only 5160 change since then was the removal of a couple of minimum-length of 5161 abbreviation checks. 5162 5163 5164 Release data2005i - 2005-04-21 15:04:16 -0400 5165 5166 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 5167 5168 5169 Release 2005h - 2005-04-04 11:24:47 -0400 5170 5171 changes by Paul Eggert 5172 5173 minor changes to Makefile and zdump.c to produce more useful output 5174 when doing a "make typecheck" 5175 5176 5177 Release 2005g - 2005-03-14 10:11:21 -0500 5178 5179 changes by Paul Eggert (a change to current DST rules in Uruguay and 5180 an update to a link to time zone software) 5181 5182 5183 Release 2005f - 2005-03-01 08:45:32 -0500 5184 5185 data and documentation changes by Paul Eggert 5186 5187 5188 Release 2005e - 2005-02-10 15:59:44 -0500 5189 5190 [not summarized] 5191 5192 5193 Release code2005d - 2005-01-31 09:21:47 -0500 5194 5195 make zic complain about links to links if the -v flag is used 5196 5197 have "make public" do more code checking 5198 5199 add an include to "localtime.c" for the benefit of gcc systems 5200 5201 5202 Release 2005c - 2005-01-17 18:36:29 -0500 5203 5204 get better results when mktime runs on a system where time_t is double 5205 5206 changes to the data files (most importantly to Paraguay) 5207 5208 5209 Release 2005b - 2005-01-10 09:19:54 -0500 5210 5211 Get localtime and gmtime working on systems with exotic time_t types. 5212 5213 Update the leap second commentary in the "leapseconds" file. 5214 5215 5216 Release 2005a - 2005-01-01 13:13:44 -0500 5217 5218 [not summarized] 5219 5220 5221 Release code2004i - 2004-12-14 13:42:58 -0500 5222 5223 Deal with systems where time_t is unsigned. 5224 5225 5226 Release code2004h - 2004-12-07 11:40:18 -0500 5227 5228 64-bit-time_t changes 5229 5230 5231 Release 2004g - 2004-11-02 09:06:01 -0500 5232 5233 update to Cuba (taking effect this weekend) 5234 5235 other changes by Paul Eggert 5236 5237 correction of the spelling of Oslo 5238 5239 changed versions of difftime.c and private.h 5240 5241 5242 Release code2004f - 2004-10-21 10:25:22 -0400 5243 5244 Cope with wide-ranging tm_year values. 5245 5246 5247 Release 2004e - 2004-10-11 14:47:21 -0400 5248 5249 Brazil/Argentina/Israel changes by Paul Eggert 5250 5251 changes to tz-link.htm by Paul 5252 5253 one small fix to Makefile 5254 5255 5256 Release 2004d - 2004-09-22 08:27:29 -0400 5257 5258 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 5259 5260 5261 Release 2004c - 2004-08-11 12:06:26 -0400 5262 5263 asctime-related changes 5264 5265 (variants of) some of the documentation changes suggested by Paul Eggert 5266 5267 5268 Release 2004b - 2004-07-19 14:33:35 -0400 5269 5270 data changes by Paul Eggert - most importantly, updates for Argentina 5271 5272 5273 Release 2004a - 2004-05-27 12:00:47 -0400 5274 5275 changes by Paul Eggert 5276 5277 Handle DST transitions that occur at the end of a month in some 5278 years but at the start of the following month in other years. 5279 5280 Add a copy of the correspondence that's the basis for claims about 5281 DST in the Navajo Nation. 5282 5283 5284 Release 2003e - 2003-12-15 09:36:47 -0500 5285 5286 changes by Arthur David Olson (primarily code changes) 5287 5288 changes by Paul Eggert (primarily data changes) 5289 5290 minor changes to "Makefile" and "northamerica" (in the latter case, 5291 optimization of the "Toronto" rules) 5292 5293 5294 Release 2003d - 2003-10-06 09:34:44 -0400 5295 5296 changes by Paul Eggert 5297 5298 5299 Release 2003c - 2003-09-16 10:47:05 -0400 5300 5301 Fix bad returns in zic.c's inleap function. 5302 Thanks to Bradley White for catching the problem! 5303 5304 5305 Release 2003b - 2003-09-16 07:13:44 -0400 5306 5307 Add a "--version" option (and documentation) to the zic and zdump commands. 5308 5309 changes to overflow/underflow checking in zic 5310 5311 a localtime typo fix. 5312 5313 Update the leapseconds and tz-art.htm files. 5314 5315 5316 Release 2003a - 2003-03-24 09:30:54 -0500 5317 5318 changes by Paul Eggert 5319 5320 a few additions and modifications to the tz-art.htm file 5321 5322 5323 Release 2002d - 2002-10-15 13:12:42 -0400 5324 5325 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 5326 5327 There's also a new time zone quote in "tz-art.htm". 5328 5329 5330 Release 2002c - 2002-04-04 11:55:20 -0500 5331 5332 changes by Paul Eggert 5333 5334 Change zic.c to avoid creating symlinks to files that don't exist. 5335 5336 5337 Release 2002b - 2002-01-28 12:56:03 -0500 5338 5339 [These change notes are for Release 2002a, which was corrupted. 5340 2002b was a corrected version of 2002a.] 5341 5342 changes by Paul Eggert 5343 5344 Update the "leapseconds" file to note that there'll be no leap 5345 second at the end of June, 2002. 5346 5347 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 5348 5349 Change to "difftime.c" to avoid sizeof problems. 5350 5351 5352 Release 2001d - 2001-10-09 13:31:32 -0400 5353 5354 changes by Paul Eggert 5355 5356 5357 Release 2001c - 2001-06-05 13:59:55 -0400 5358 5359 changes by Paul Eggert and Andrew Brown 5360 5361 5362 Release 2001b - 2001-04-05 16:44:38 -0400 5363 5364 changes by Paul Eggert (modulo jnorgard's typo fix) 5365 5366 tz-art.htm has been HTMLified. 5367 5368 5369 Release 2001a - 2001-03-13 12:57:44 -0500 5370 5371 changes by Paul Eggert 5372 5373 An addition to the "leapseconds" file: comments with the text of the 5374 latest IERS leap second notice. 5375 5376 Trailing white space has been removed from data file lines, and 5377 repeated spaces in "Rule Jordan" lines in the "asia" file have been 5378 converted to tabs. 5379 5380 5381 Release 2000h - 2000-12-14 15:33:38 -0500 5382 5383 changes by Paul Eggert 5384 5385 one typo fix in the "art" file 5386 5387 With providence, this is the last update of the millennium. 5388 5389 5390 Release 2000g - 2000-10-10 11:35:22 -0400 5391 5392 changes by Paul Eggert 5393 5394 correction of John Mackin's name submitted by Robert Elz 5395 5396 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 5397 Emmy Awards broadcast. 5398 5399 5400 Release 2000f - 2000-08-10 09:31:58 -0400 5401 5402 changes by Paul Eggert 5403 5404 Added information in "tz-art.htm" on a Seinfeld reference to DST. 5405 5406 Error checking and messages in the "yearistype" script have been 5407 improved. 5408 5409 5410 Release 2000e - 2000-07-31 09:27:54 -0400 5411 5412 data changes by Paul Eggert 5413 5414 a change to the default value of the defined constant HAVE_STRERROR 5415 5416 the addition of a Dave Barry quote on DST to the tz-arts file 5417 5418 5419 Release 2000d - 2000-04-20 15:43:04 -0400 5420 5421 changes to the documentation and code of strftime for C99 conformance 5422 5423 a bug fix for date.c 5424 5425 These are based on (though modified from) changes by Paul Eggert. 5426 5427 5428 Release 2000c - 2000-03-04 10:31:43 -0500 5429 5430 changes by Paul Eggert 5431 5432 5433 Release 2000b - 2000-02-21 12:16:29 -0500 5434 5435 changes by Paul Eggert and Joseph Myers 5436 5437 modest tweaks to the tz-art.htm and tz-link.htm files 5438 5439 5440 Release 2000a - 2000-01-18 09:21:26 -0500 5441 5442 changes by Paul Eggert 5443 5444 The two hypertext documents have also been renamed. 5445 5446 5447 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 5448 5449 Paul Eggert's changes 5450 5451 additions to the "zic" manual page and the "Arts.htm" file 5452 5453 5454 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 5455 5456 [not summarized] 5457 5458 5459 Release data1999h - 1999-10-07 03:50:29 -0400 5460 5461 changes by Paul Eggert to "europe" (most importantly, fixing 5462 Lithuania and Estonia) 5463 5464 5465 Release 1999g - 1999-09-28 11:06:18 -0400 5466 5467 data changes by Paul Eggert (most importantly, the change for 5468 Lebanon that buys correctness for this coming Sunday) 5469 5470 The "code" file contains changes to "Makefile" and "checktab.awk" to 5471 allow better checking of time zone files before they are published. 5472 5473 5474 Release 1999f - 1999-09-23 09:48:14 -0400 5475 5476 changes by Arthur David Olson and Paul Eggert 5477 5478 5479 Release 1999e - 1999-08-17 15:20:54 -0400 5480 5481 changes circulated by Paul Eggert, although the change to handling 5482 of DST-specifying timezone names has been commented out for now 5483 (search for "XXX" in "localtime.c" for details). These files also 5484 do not make any changes to the start of DST in Brazil. 5485 5486 In addition to Paul's changes, there are updates to "Arts.htm" and 5487 cleanups of URLs. 5488 5489 5490 Release 1999d - 1999-03-30 11:31:07 -0500 5491 5492 changes by Paul Eggert 5493 5494 The Makefile's "make public" rule has also been changed to do a test 5495 compile of each individual time zone data file (which should help 5496 avoid problems such as the one we had with Nicosia). 5497 5498 5499 Release 1999c - 1999-03-25 09:47:47 -0500 5500 5501 changes by Paul Eggert, most importantly the change for Chile. 5502 5503 5504 Release 1999b - 1999-02-01 17:51:44 -0500 5505 5506 changes by Paul Eggert 5507 5508 code changes (suggested by Mani Varadarajan, mani at be.com) for 5509 correct handling of symbolic links when building using a relative directory 5510 5511 code changes to generate correct messages for failed links 5512 5513 updates to the URLs in Arts.htm 5514 5515 5516 Release 1999a - 1999-01-19 16:20:29 -0500 5517 5518 error message internationalizations and corrections in zic.c and 5519 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 5520 to whom thanks!) 5521 5522 5523 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 5524 5525 changes for Brazil, Chile, and Germany 5526 5527 support for use of "24:00" in the input files for the time zone compiler 5528 5529 5530 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 5531 5532 changes by Paul Eggert 5533 5534 correction to a define in the "private.h" file 5535 5536 5537 Release data1998g - 1998-08-11 03:28:35 -0000 5538 [tzdata1998g.tar.gz is missing!] 5539 5540 Lithuanian change provided by mgedmin at pub.osf.it 5541 5542 Move creation of the GMT link with Etc/GMT to "etcetera" (from 5543 "backward") to ensure that the GMT file is created even where folks 5544 don't want the "backward" links (as suggested by Paul Eggert). 5545 5546 5547 Release data1998f - 1998-07-20 13:50:00 -0000 5548 [tzdata1998f.tar.gz is missing!] 5549 5550 Update the "leapseconds" file to include the newly announced 5551 insertion at the end of 1998. 5552 5553 5554 Release code1998f - 1998-06-01 10:18:31 -0400 5555 5556 addition to localtime.c by Guy Harris 5557 5558 5559 Release 1998e - 1998-05-28 09:56:26 -0400 5560 5561 The Makefile is changed to produce zoneinfo-posix rather than 5562 zoneinfo/posix, and to produce zoneinfo-leaps rather than 5563 zoneinfo/right. 5564 5565 data changes by Paul Eggert 5566 5567 changes from Guy Harris to provide asctime_r and ctime_r 5568 5569 A usno1998 file (substantially identical to usno1997) has been added. 5570 5571 5572 Release 1998d - 1998-05-14 11:58:34 -0400 5573 5574 changes to comments (in particular, elimination of references to CIA maps). 5575 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 5576 where changes occur. 5577 5578 5579 Release 1998c - 1998-02-28 12:32:26 -0500 5580 5581 changes by Paul Eggert (save the "French correction," on which I'll 5582 wait for the dust to settle) 5583 5584 symlink changes 5585 5586 changes and additions to Arts.htm 5587 5588 5589 Release 1998b - 1998-01-17 14:31:51 -0500 5590 5591 URL cleanups and additions 5592 5593 5594 Release 1998a - 1998-01-13 12:37:35 -0500 5595 5596 changes by Paul Eggert 5597 5598 5599 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 5600 5601 changes by Paul Eggert, with minor modifications from Arthur David 5602 Olson to make the files more browser friendly 5603 5604 5605 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 5606 5607 minor changes to put "TZif" at the start of each timezone information file 5608 5609 a rule has also been added to the Makefile so you can 5610 make zones 5611 to just recompile the zone information files (rather than doing a 5612 full "make install" with its other effects). 5613 5614 5615 Release data1997i - 1997-10-07 08:45:38 -0400 5616 5617 changes to Africa by Paul Eggert 5618 5619 5620 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 5621 5622 corrections for Uruguay (and other locations) 5623 5624 Arthur David Olson's simple-minded fix allowing mktime to both 5625 correctly handle leap seconds and correctly handle tm_sec values 5626 upon which arithmetic has been performed. 5627 5628 5629 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 5630 5631 Paul Eggert's updates 5632 5633 a small change to a function prototype; 5634 5635 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 5636 include information on Around the World in Eighty Days. 5637 5638 5639 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 5640 5641 fixes to zic's error handling 5642 5643 changes inspired by the item circulated on Slovenia 5644 5645 The description of Web resources has been HTMLified for browsing 5646 convenience. 5647 5648 A new piece of tz-related music has been added to the "Music" file. 5649 5650 5651 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 5652 5653 Paul Eggert's latest suggestions 5654 5655 5656 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 5657 5658 changes to "zic.c" to correct performance of the "-s" option 5659 5660 a new file "usno1997" 5661 5662 5663 Release data1997c - 1997-03-04 09:58:18 -0500 5664 5665 changes in Israel 5666 5667 5668 Release 1997b - 1997-02-27 18:34:19 -0500 5669 5670 The data file incorporates the 1997 leap second. 5671 5672 The code file incorporates Arthur David Olson's take on the 5673 zic/multiprocessor/directory-creation situation. 5674 5675 5676 Release 1997a - 1997-01-21 09:11:10 -0500 5677 5678 Paul Eggert's Antarctica (and other changes) 5679 5680 Arthur David Olson finessed the "getopt" issue by checking against 5681 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 5682 is returned while SunOS 5.5's manual says EOF is returned). 5683 5684 5685 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 5686 5687 Paul Eggert's latest changes 5688 5689 5690 Release code1996n - 1996-12-16 09:42:02 -0500 5691 5692 link snapping fix from Bruce Evans (via Garrett Wollman) 5693 5694 5695 Release data1996m - 1996-11-24 02:37:34 -0000 5696 [tzdata1996m.tar.gz is missing!] 5697 5698 Paul Eggert's batch of changes 5699 5700 5701 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 5702 5703 No functional changes here; the files have simply been changed to 5704 make more use of ISO style dates in comments. The names of the above 5705 files now include the year in full. 5706 5707 5708 Release code96l - 1996-09-08 17:12:20 -0400 5709 5710 tzcode96k was missing a couple of pieces. 5711 5712 5713 Release 96k - 1996-09-08 16:06:22 -0400 5714 5715 the latest round of changes from Paul Eggert 5716 5717 the recent Year 2000 material 5718 5719 5720 Release code96j - 1996-07-30 13:18:53 -0400 5721 5722 Set sp->typecnt as suggested by Timothy Patrick Murphy. 5723 5724 5725 Release code96i - 1996-07-27 20:11:35 -0400 5726 5727 Paul's suggested patch for strftime %V week numbers 5728 5729 5730 Release data96i - 1996-07-01 18:13:04 -0400 5731 5732 "northamerica" and "europe" changes by Paul Eggert 5733 5734 5735 Release code96h - 1996-06-05 08:02:21 -0400 5736 5737 fix for handling transitions specified in Universal Time 5738 5739 Some "public domain" notices have also been added. 5740 5741 5742 Release code96g - 1996-05-16 14:00:26 -0400 5743 5744 fix for the simultaneous-DST-and-zone-change challenge 5745 5746 5747 Release data96h - 1996-05-09 17:40:51 -0400 5748 5749 changes by Paul Eggert 5750 5751 5752 Release code96f-data96g - 1996-05-03 03:09:59 -0000 5753 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 5754 5755 The changes get us some of the way to fixing the problems noted in Paul 5756 Eggert's letter yesterday (in addition to a few others). The approach 5757 has been to make zic a bit smarter about figuring out what time zone 5758 abbreviations apply just after the time specified in the "UNTIL" part 5759 of a zone line. Putting the smarts in zic means avoiding having 5760 transition times show up in both "Zone" lines and "Rule" lines, which 5761 in turn avoids multiple transition time entries in time zone files. 5762 (This also makes the zic input files such as "europe" a bit shorter and 5763 should ease maintenance.) 5764 5765 5766 Release data96f - 1996-04-19 19:20:03 -0000 5767 [tzdata96f.tar.gz is missing!] 5768 5769 The only changes are to the "northamerica" file; the time zone 5770 abbreviation for Denver is corrected to MST (and MDT), and the 5771 comments for Mexico have been updated. 5772 5773 5774 Release data96e - 1996-03-19 17:37:26 -0500 5775 5776 Proposals by Paul Eggert, in particular the Portugal change that 5777 comes into play at the end of this month. 5778 5779 5780 Release data96d - 1996-03-18 20:49:39 -0500 5781 5782 [not summarized] 5783 5784 5785 Release code96e - 1996-02-29 15:43:27 -0000 5786 [tzcode96e.tar.gz is missing!] 5787 5788 internationalization changes and the fix to the documentation for strftime 5789 5790 5791 Release code96d-data96c - 1996-02-12 11:05:27 -0500 5792 5793 The "code" file simply updates Bob Kridle's electronic address. 5794 5795 The "data" file updates rules for Mexico. 5796 5797 5798 Release data96b - 1996-01-27 15:44:42 -0500 5799 5800 Kiribati change 5801 5802 5803 Release code96c - 1996-01-16 16:58:15 -0500 5804 5805 leap-year streamlining and binary-search changes 5806 5807 fix to newctime.3 5808 5809 5810 Release code96b - 1996-01-10 20:42:39 -0500 5811 5812 fixes and enhancements from Paul Eggert, including code that 5813 emulates the behavior of recent versions of the SunOS "date" 5814 command. 5815 5816 5817 Release 96a - 1996-01-06 09:08:24 -0500 5818 5819 Israel updates 5820 5821 fixes to strftime.c for correct ISO 8601 week number generation, 5822 plus support for two new formats ('G' and 'g') to give ISO 8601 year 5823 numbers (which are not necessarily the same as calendar year numbers) 5824 5825 5826 Release code95i-data95m - 1995-12-21 12:46:47 -0500 5827 5828 The latest revisions from Paul Eggert are included, the usno1995 5829 file has been updated, and a new file ("WWW") covering useful URLs 5830 has been added. 5831 5832 5833 Release code95h-data95l - 1995-12-19 18:10:12 -0500 5834 5835 A simplification of a macro definition, a change to data for Sudan, 5836 and (for last minute shoppers) notes in the "Music" file on the CD 5837 "Old Man Time". 5838 5839 5840 Release code95g-data95k - 1995-10-30 10:32:47 -0500 5841 5842 (slightly reformatted) 8-bit-clean proposed patch 5843 5844 minor patch: US/Eastern -> America/New_York 5845 5846 snapshot of the USNO's latest data ("usno1995") 5847 5848 some other minor cleanups 5849 5850 5851 Release code95f-data95j - 1995-10-28 21:01:34 -0000 5852 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 5853 5854 European cleanups 5855 5856 support for 64-bit time_t's 5857 5858 optimization in localtime.c 5859 5860 5861 Release code95e - 1995-10-13 13:23:57 -0400 5862 5863 the mktime change to scan from future to past when trying to find time zone 5864 offsets 5865 5866 5867 Release data95i - 1995-09-26 10:43:26 -0400 5868 5869 For Canada/Central, guess that the Sun customer's "one week too 5870 early" was just a approximation, and the true error is one month 5871 too early. This is consistent with the rest of Canada. 5872 5873 5874 Release data95h - 1995-09-21 11:26:48 -0400 5875 5876 latest changes from Paul Eggert 5877 5878 5879 Release code95d - 1995-09-14 11:14:45 -0400 5880 5881 the addition of a "Music" file, which documents four recorded 5882 versions of the tune "Save That Time". 5883 5884 5885 Release data95g - 1995-09-01 17:21:36 -0400 5886 5887 "yearistype" correction 5888 5889 5890 Release data95f - 1995-08-28 20:46:56 -0400 5891 5892 Paul Eggert's change to the australasia file 5893 5894 5895 Release data95e - 1995-07-08 18:02:34 -0400 5896 5897 The only change is a leap second at the end of this year. 5898 Thanks to Bradley White for forwarding news on the leap second. 5899 5900 5901 Release data95d - 1995-07-03 13:26:22 -0400 5902 5903 Paul Eggert's changes 5904 5905 5906 Release data95c - 1995-07-02 19:19:28 -0400 5907 5908 changes to "asia", "backward", "europe", and "southamerica" 5909 (read: northamericacentrics need not apply) 5910 5911 5912 Release code95c - 1995-03-13 14:00:46 -0500 5913 5914 one-line fix for sign extension problems in detzcode 5915 5916 5917 Release 95b - 1995-03-04 11:22:38 -0500 5918 5919 Minor changes in both: 5920 5921 The "code" file contains a workaround for the lack of "unistd.h" in 5922 Microsoft C++ version 7. 5923 5924 The "data" file contains a fixed "Link" for America/Shiprock. 5925 5926 5927 Release 94h - 1994-12-10 12:51:14 -0500 5928 5929 The files: 5930 5931 * incorporate the changes to "zdump" and "date" to make changes to 5932 the "TZ" environment variable permanent; 5933 5934 * incorporate the table changes by Paul Eggert; 5935 5936 * include (and document) support for universal time specifications in 5937 data files - but do not (yet) include use of this feature in the 5938 data files. 5939 5940 Think of this as "TZ Classic" - the software has been set up not to break if 5941 universal time shows up in its input, and data entries have been 5942 left as is so as not to break existing implementations. 5943 5944 5945 Release data94f - 1994-08-20 12:56:09 -0400 5946 5947 (with thanks!) the latest data updates from Paul Eggert 5948 5949 5950 Release data94e - 1994-06-04 13:13:53 -0400 5951 5952 [not summarized] 5953 5954 5955 Release code94g - 1994-05-05 12:14:07 -0400 5956 5957 fix missing "optind.c" and a reference to it in the Makefile 5958 5959 5960 Release code94f - 1994-05-05 13:00:33 -0000 5961 [tzcode94f.tar.gz is missing!] 5962 5963 changes to avoid overflow in difftime, as well as changes to cope 5964 with the 52/53 challenge in strftime 5965 5966 5967 Release code94e - 1994-03-30 23:32:59 -0500 5968 5969 change for the benefit of PCTS 5970 5971 5972 Release 94d - 1994-02-24 15:42:25 -0500 5973 5974 Avoid clashes with POSIX semantics for zones such as GMT+4. 5975 5976 Some other very minor housekeeping is also present. 5977 5978 5979 Release code94c - 1994-02-10 08:52:40 -0500 5980 5981 Fix bug where mkdirs was broken unless you compile with 5982 -fwritable-strings (which is generally losing to do). 5983 5984 5985 Release 94b - 1994-02-07 10:04:33 -0500 5986 5987 work by Paul Eggert who notes: 5988 5989 I found another book of time zone histories by E W Whitman; it's not 5990 as extensive as Shanks but has a few goodies of its own. I used it 5991 to update the tables. I also fixed some more as a result of 5992 correspondence with Adam David and Peter Ilieve, and move some stray 5993 links from 'europe' to 'backward'. I corrected some scanning errors 5994 in usno1989. 5995 5996 As far as the code goes, I fixed zic to allow years in the range 5997 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 5998 And I cleaned up the zic documentation a little bit. 5999 6000 6001 Release data94a - 1994-02-03 08:58:54 -0500 6002 6003 It simply incorporates the recently announced leap second into the 6004 "leapseconds" file. 6005 6006 6007 Release 93g - 1993-11-22 17:28:27 -0500 6008 6009 Paul Eggert has provided a good deal of historic information (based 6010 on Shanks), and there are some code changes to deal with the buglets 6011 that crawled out in dealing with the new information. 6012 6013 6014 Release 93f - 1993-10-15 12:27:46 -0400 6015 6016 Paul Eggert's changes 6017 6018 6019 Release 93e - 1993-09-05 21:21:44 -0400 6020 6021 This has updated data for Israel, England, and Kwajalein. There's 6022 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 6023 Thanks to Paul Eggert and Peter Ilieve for the changes. 6024 6025 6026 Release 93d - 1993-06-17 23:34:17 -0400 6027 6028 new fix and new data on Israel 6029 6030 6031 Release 93c - 1993-06-06 19:31:55 -0400 6032 6033 [not summarized] 6034 6035 6036 Release 93b - 1993-02-02 14:53:58 -0500 6037 6038 updated "leapseconds" file 6039 6040 6041 Release 93 - 1993-01-08 07:01:06 -0500 6042 6043 At kre's suggestion, the package has been split in two - a code piece 6044 (which also includes documentation) that's only of use to folks who 6045 want to recompile things and a data piece useful to anyone who can 6046 run "zic". 6047 6048 The new version has a few changes to the data files, a few 6049 portability changes, and an off-by-one fix (with thanks to 6050 Tom Karzes at deshaw.com for providing a description and a 6051 solution). 6052 6053 6054 Release 92c - 1992-11-21 17:35:36 -0000 6055 [tz92c.tar.Z is missing!] 6056 6057 The fallout from the latest round of DST transitions. 6058 6059 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 6060 there's also a change to "zic.c" that makes it portable to more systems. 6061 6062 6063 Release 92 - 1992-04-25 18:17:03 -0000 6064 [tz92.tar.Z is missing!] 6065 6066 By popular demand (well, at any rate, following a request by kre at munnari) 6067 6068 6069 The 1989 update of the time zone package featured: 6070 6071 * POSIXization (including interpretation of POSIX-style TZ environment 6072 variables, provided by Guy Harris), 6073 * ANSIfication (including versions of "mktime" and "difftime"), 6074 * SVIDulation (an "altzone" variable) 6075 * MACHination (the "gtime" function) 6076 * corrections to some time zone data (including corrections to the rules 6077 for Great Britain and New Zealand) 6078 * reference data from the United States Naval Observatory for folks who 6079 want to do additional time zones 6080 * and the 1989 data for Saudi Arabia. 6081 6082 (Since this code will be treated as "part of the implementation" in some 6083 places and as "part of the application" in others, there's no good way to 6084 name functions, such as timegm, that are not part of the proposed ANSI C 6085 standard; such functions have kept their old, underscore-free names in this 6086 update.) 6087 6088 And the "dysize" function has disappeared; it was present to allow 6089 compilation of the "date" command on old BSD systems, and a version of "date" 6090 is now provided in the package. The "date" command is not created when you 6091 "make all" since it may lack options provided by the version distributed with 6092 your operating system, or may not interact with the system in the same way 6093 the native version does. 6094 6095 Since POSIX frowns on correct leap second handling, the default behavior of 6096 the "zic" command (in the absence of a "-L" option) has been changed to omit 6097 leap second information from its output files. 6098 6099 6100 ----- 6101 Notes 6102 6103 This file contains copies of the part of each release announcement 6104 that talks about the changes in that release. The text has been 6105 adapted and reformatted for the purposes of this file. 6106 6107 Traditionally a release R consists of a pair of tarball files, 6108 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 6109 code2010a, data2012c) consist of just one or the other tarball, and a 6110 few (e.g., code2012c-data2012d) have tarballs with mixed version 6111 numbers. Recent releases also come in an experimental format 6112 consisting of a single tarball tzdb-R.tar.lz with extra data. 6113 6114 Release timestamps are taken from the release's commit (for newer, 6115 Git-based releases), from the newest file in the tarball (for older 6116 releases, where this info is available) or from the email announcing 6117 the release (if all else fails; these are marked with a time zone 6118 abbreviation of -0000 and an "is missing!" comment). 6119 6120 Earlier versions of the code and data were not announced on the tz 6121 list and are not summarized here. 6122 6123 This file is in the public domain. 6124 6125 Local Variables: 6126 coding: utf-8 6127 End: 6128
Indexes created Mon Sep 29 03:10:08 GMT 2025