NEWS revision 1.42
1 News for the tz database 2 3 Release 2023c - 2023-03-28 12:42:14 -0700 4 5 Changes to past and future timestamps 6 7 Model Lebanon's DST chaos by reverting data to tzdb 2023a. 8 (Thanks to Rany Hany for the heads-up.) 9 10 11 Release 2023b - 2023-03-23 19:50:38 -0700 12 13 Changes to future timestamps 14 15 This year Lebanon springs forward April 20/21 not March 25/26. 16 (Thanks to Saadallah Itani.) [This was reverted in 2023c.] 17 18 19 Release 2023a - 2023-03-22 12:39:33 -0700 20 21 Briefly: 22 Egypt now uses DST again, from April through October. 23 This year Morocco springs forward April 23, not April 30. 24 Palestine delays the start of DST this year. 25 Much of Greenland still uses DST from 2024 on. 26 America/Yellowknife now links to America/Edmonton. 27 tzselect can now use current time to help infer timezone. 28 The code now defaults to C99 or later. 29 Fix use of C23 attributes. 30 31 Changes to future timestamps 32 33 Starting in 2023, Egypt will observe DST from April's last Friday 34 through October's last Thursday. (Thanks to Ahmad ElDardiry.) 35 Assume the transition times are 00:00 and 24:00, respectively. 36 37 In 2023 Morocco's spring-forward transition after Ramadan 38 will occur April 23, not April 30. (Thanks to Milamber.) 39 Adjust predictions for future years accordingly. This affects 40 predictions for 2023, 2031, 2038, and later years. 41 42 This year Palestine will delay its spring forward from 43 March 25 to April 29 due to Ramadan. (Thanks to Heba Hamad.) 44 Make guesses for future Ramadans too. 45 46 Much of Greenland, represented by America/Nuuk, will continue to 47 observe DST using European Union rules. When combined with 48 Greenland's decision not to change the clocks in fall 2023, 49 America/Nuuk therefore changes from -03/-02 to -02/-01 effective 50 2023-10-29 at 01:00 UTC. (Thanks to Thomas M. Steenholdt.) 51 This change from 2022g doesn't affect timestamps until 2024-03-30, 52 and doesn't affect tm_isdst until 2023-03-25. 53 54 Changes to past timestamps 55 56 America/Yellowknife has changed from a Zone to a backward 57 compatibility Link, as it no longer differs from America/Edmonton 58 since 1970. (Thanks to Almaz Mingaleev.) This affects some 59 pre-1948 timestamps. The old data are now in 'backzone'. 60 61 Changes to past time zone abbreviations 62 63 When observing Moscow time, Europe/Kirov and Europe/Volgograd now 64 use the abbreviations MSK/MSD instead of numeric abbreviations, 65 for consistency with other timezones observing Moscow time. 66 67 Changes to code 68 69 You can now tell tzselect local time, to simplify later choices. 70 Select the 'time' option in its first prompt. 71 72 You can now compile with -DTZNAME_MAXIMUM=N to limit time zone 73 abbreviations to N bytes (default 255). The reference runtime 74 library now rejects POSIX-style TZ strings that contain longer 75 abbreviations, treating them as UTC. Previously the limit was 76 platform dependent and abbreviations were silently truncated to 77 16 bytes even when the limit was greater than 16. 78 79 The code by default is now designed for C99 or later. To build in 80 a C89 environment, compile with -DPORT_TO_C89. To support C89 81 callers of the tzcode library, compile with -DSUPPORT_C89. The 82 two new macros are transitional aids planned to be removed in a 83 future version, when C99 or later will be required. 84 85 The code now builds again on pre-C99 platforms, if you compile 86 with -DPORT_TO_C89. This fixes a bug introduced in 2022f. 87 88 On C23-compatible platforms tzcode no longer uses syntax like 89 'static [[noreturn]] void usage(void);'. Instead, it uses 90 '[[noreturn]] static void usage(void);' as strict C23 requires. 91 (Problem reported by Houge Langley.) 92 93 The code's functions now constrain their arguments with the C 94 'restrict' keyword consistently with their documentation. 95 This may allow future optimizations. 96 97 zdump again builds standalone with ckdadd and without setenv, 98 fixing a bug introduced in 2022g. (Problem reported by panic.) 99 100 leapseconds.awk can now process a leap seconds file that never 101 expires; this might be useful if leap seconds are discontinued. 102 103 Changes to commentary 104 105 tz-link.html has a new section "Coordinating with governments and 106 distributors". (Thanks to Neil Fuller for some of the text.) 107 108 To improve tzselect diagnostics, zone1970.tab's comments column is 109 now limited to countries that have multiple timezones. 110 111 Note that leap seconds are planned to be discontinued by 2035. 112 113 114 Release 2022g - 2022-11-29 08:58:31 -0800 115 116 Briefly: 117 The northern edge of Chihuahua changes to US timekeeping. 118 Much of Greenland stops changing clocks after March 2023. 119 Fix some pre-1996 timestamps in northern Canada. 120 C89 is now deprecated; please use C99 or later. 121 Portability fixes for AIX, libintl, MS-Windows, musl, z/OS 122 In C code, use more C23 features if available. 123 C23 timegm now supported by default 124 Fixes for unlikely integer overflows 125 126 Changes to future timestamps 127 128 In the Mexican state of Chihuahua, the border strip near the US 129 will change to agree with nearby US locations on 2022-11-30. 130 The strip's western part, represented by Ciudad Jurez, switches 131 from -06 all year to -07/-06 with US DST rules, like El Paso, TX. 132 The eastern part, represented by Ojinaga, will observe US DST next 133 year, like Presidio, TX. (Thanks to Heitor David Pinto.) 134 A new Zone America/Ciudad_Juarez splits from America/Ojinaga. 135 136 Much of Greenland, represented by America/Nuuk, stops observing 137 winter time after March 2023, so its daylight saving time becomes 138 standard time. (Thanks to Jonas Nyrup and Jrgen Appel.) 139 140 Changes to past timestamps 141 142 Changes for pre-1996 northern Canada (thanks to Chris Walton): 143 144 Merge America/Iqaluit and America/Pangnirtung into the former, 145 with a backward compatibility link for the latter name. 146 There is no good evidence the two locations differ since 1970. 147 This change affects pre-1996 America/Pangnirtung timestamps. 148 149 Cambridge Bay, Inuvik, Iqaluit, Rankin Inlet, Resolute and 150 Yellowknife did not observe DST in 1965, and did observe DST 151 from 1972 through 1979. 152 153 Whitehorse moved from -09 to -08 on 1966-02-27, not 1967-05-28. 154 155 Colombia's 1993 fallback was 02-06 24:00, not 04-04 00:00. 156 (Thanks to Alois Treindl.) 157 158 Singapore's 1981-12-31 change was at 16:00 UTC (23:30 local time), 159 not 24:00 local time. (Thanks to Geoff Clare via Robert Elz.) 160 161 Changes to code 162 163 Although tzcode still works with C89, bugs found in recent routine 164 maintenance indicate that bitrot has set in and that in practice 165 C89 is no longer used to build tzcode. As it is a maintenance 166 burden, support for C89 is planned to be removed soon. Instead, 167 please use compilers compatible with C99, C11, C17, or C23. 168 169 timegm, which tzcode implemented in 1989, will finally be 170 standardized 34 years later as part of C23, so timegm is now 171 supported even if STD_INSPIRED is not defined. 172 173 Fix bug in zdump's tzalloc emulation on hosts that lack tm_zone. 174 (Problem reported by on Trn Cng Danh.) 175 176 Fix bug in zic on hosts where malloc(0) yields NULL on success. 177 (Problem reported by Tim McBrayer for AIX 6.1.) 178 179 Fix zic configuration to avoid linkage failures on some platforms. 180 (Problems reported by Gilmore Davidson and Igor Ivanov.) 181 182 Work around MS-Windows nmake incompatibility with POSIX. 183 (Problem reported by Manuela Friedrich.) 184 185 Port mktime and strftime to debugging platforms where accessing 186 uninitialized data has undefined behavior (strftime problem 187 reported by Robert Elz). 188 189 Check more carefully for unlikely integer overflows, preferring 190 C23 <stdckdint.h> to overflow checking by hand, as the latter has 191 had obscure bugs. 192 193 Changes to build procedure 194 195 New Makefile rule check_mild that skips checking whether Link 196 lines are in the file 'backward'. (Inspired by a suggestion from 197 Stephen Colebourne.) 198 199 On C23-compatible platforms tzcode no longer uses syntax like 200 'static [[noreturn]] void usage(void);'. Instead, it uses 201 '[[noreturn]] static void usage(void);' as strict C23 requires. 202 (Problem reported by Houge Langley.) 203 204 205 Release 2022f - 2022-10-28 18:04:57 -0700 206 207 Briefly: 208 Mexico will no longer observe DST except near the US border. 209 Chihuahua moves to year-round -06 on 2022-10-30. 210 Fiji no longer observes DST. 211 Move links to 'backward'. 212 In vanguard form, GMT is now a Zone and Etc/GMT a link. 213 zic now supports links to links, and vanguard form uses this. 214 Simplify four Ontario zones. 215 Fix a Y2438 bug when reading TZif data. 216 Enable 64-bit time_t on 32-bit glibc platforms. 217 Omit large-file support when no longer needed. 218 In C code, use some C23 features if available. 219 Remove no-longer-needed workaround for Qt bug 53071. 220 221 Changes to future timestamps 222 223 Mexico will no longer observe DST after 2022, except for areas 224 near the US border that continue to observe US DST rules. 225 On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves 226 from -07 (-06 with DST) to year-round -06, thus not changing 227 its clocks that day. The new law states that Chihuahua 228 near the US border no longer observes US DST. 229 (Thanks to gera for the heads-up about Chihuahua.) 230 231 Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.) 232 For now, assume DST is suspended indefinitely. 233 234 Changes to data 235 236 Move links to 'backward' to ease and simplify link maintenance. 237 This affects generated data only if you use 'make BACKWARD='. 238 239 GMT is now a Zone and Etc/GMT a link instead of vice versa, 240 as GMT is needed for leap second support whereas Etc/GMT is not. 241 However, this change exposes a bug in TZUpdater 2.3.2 so it is 242 present only in vanguard form for now. 243 244 Vanguard form now uses links to links, as zic now supports this. 245 246 Changes to past timestamps 247 248 Simplify four Ontario zones, as most of the post-1970 differences 249 seem to have been imaginary. (Problem reported by Chris Walton.) 250 Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay 251 to 'backzone'; backward-compatibility links still work, albeit 252 with some different timestamps before November 2005. 253 254 Changes to code 255 256 zic now supports links to links regardless of input line order. 257 For example, if Australia/Sydney is a Zone, the lines 258 Link Australia/Canberra Australia/ACT 259 Link Australia/Sydney Australia/Canberra 260 now work correctly, even though the shell commands 261 ln Australia/Canberra Australia/ACT 262 ln Australia/Sydney Australia/Canberra 263 would fail because the first command attempts to use a link 264 Australia/Canberra that does not exist until after the second 265 command is executed. Previously, zic had unspecified behavior if 266 a Link line's target was another link, and zic often misbehaved if 267 a Link line's target was a later Link line. 268 269 Fix line number in zic's diagnostic for a link to a link. 270 271 Fix a bug that caused localtime to mishandle timestamps starting 272 in the year 2438 when reading data generated by 'zic -b fat' when 273 distant-future DST transitions occur at times given in standard 274 time or in UT, not the usual case of local time. This occurs when 275 the corresponding .zi Rule lines specify DST transitions with TO 276 columns of 'max' and AT columns that end in 's' or 'u'. The 277 number 2438 comes from the 32-bit limit in the year 2038, plus the 278 400-year Gregorian cycle. (Problem reported by Bradley White.) 279 280 On glibc 2.34 and later, which optionally supports 64-bit time_t 281 on platforms like x86 where time_t was traditionally 32 bits, 282 default time_t to 64 instead of 32 bits. This lets functions like 283 localtime support timestamps after the year 2038, and fixes 284 year-2038 problems in zic when accessing files dated after 2038. 285 To continue to limit time_t to 32 bits on these platforms, use 286 "make CFLAGS='-D_TIME_BITS=32'". 287 288 In C code, do not enable large-file support on platforms like AIX 289 and macOS that no longer need it now that tzcode does not use 290 off_t or related functions like 'stat'. Large-file support is 291 still enabled by default on GNU/Linux, as it is needed for 64-bit 292 time_t support. 293 294 In C code, prefer C23 keywords to pre-C23 macros for alignof, 295 bool, false, and true. Also, use the following C23 features if 296 available: __has_include, unreachable. 297 298 zic no longer works around Qt bug 53071, as the relevant Qt 299 releases have been out of support since 2019. This change affects 300 only fat TZif files, as thin files never had the workaround. 301 302 zdump no longer modifies the environ vector when compiled on 303 platforms lacking tm_zone or when compiled with -DUSE_LTZ=0. 304 This avoid undefined behavior on POSIX platforms. 305 306 307 Release 2022e - 2022-10-11 11:13:02 -0700 308 309 Briefly: 310 Jordan and Syria switch from +02/+03 with DST to year-round +03. 311 312 Changes to future timestamps 313 314 Jordan and Syria are abandoning the DST regime and are changing to 315 permanent +03, so they will not fall back from +03 to +02 on 316 2022-10-28. (Thanks to Steffen Thorsen and Issam Al-Zuwairi.) 317 318 Changes to past timestamps 319 320 On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00. 321 322 Changes to past time zone abbreviations and DST flags 323 324 The temporary advancement of clocks in central Mexico in summer 325 1931 is now treated as daylight saving time, instead of as two 326 changes to standard time. 327 328 329 Release 2022d - 2022-09-23 12:02:57 -0700 330 331 Briefly: 332 Palestine transitions are now Saturdays at 02:00. 333 Simplify three Ukraine zones into one. 334 335 Changes to future timestamps 336 337 Palestine now springs forward and falls back at 02:00 on the 338 first Saturday on or after March 24 and October 24, respectively. 339 This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00. 340 (Thanks to Heba Hamad.) 341 342 Changes to past timestamps 343 344 Simplify three Ukraine zones to one, since the post-1970 345 differences seem to have been imaginary. Move Europe/Uzhgorod and 346 Europe/Zaporozhye to 'backzone'; backward-compatibility links 347 still work, albeit with different timestamps before October 1991. 348 349 350 Release 2022c - 2022-08-15 17:47:18 -0700 351 352 Briefly: 353 Work around awk bug in FreeBSD, macOS, etc. 354 Improve tzselect on intercontinental Zones. 355 356 Changes to code 357 358 Work around a bug in onetrueawk that broke commands like 359 'make traditional_tarballs' on FreeBSD, macOS, etc. 360 (Problem reported by Deborah Goldsmith.) 361 362 Add code to tzselect that uses experimental structured comments in 363 zone1970.tab to clarify whether Zones like Africa/Abidjan and 364 Europe/Istanbul cross continent or ocean boundaries. 365 (Inspired by a problem reported by Peter Krefting.) 366 367 Fix bug with 'zic -d /a/b/c' when /a is unwritable but the 368 directory /a/b already exists. 369 370 Remove zoneinfo2tdf.pl, as it was unused and triggered false 371 malware alarms on some email servers. 372 373 374 Release 2022b - 2022-08-10 15:38:32 -0700 375 376 Briefly: 377 Chile's DST is delayed by a week in September 2022. 378 Iran no longer observes DST after 2022. 379 Rename Europe/Kiev to Europe/Kyiv. 380 New zic -R option 381 Vanguard form now uses %z. 382 Finish moving duplicate-since-1970 zones to 'backzone'. 383 New build option PACKRATLIST 384 New tailored_tarballs target, replacing rearguard_tarballs 385 386 Changes to future timestamps 387 388 Chile's 2022 DST start is delayed from September 4 to September 11. 389 (Thanks to Juan Correa.) 390 391 Iran plans to stop observing DST permanently, after it falls back 392 on 2022-09-21. (Thanks to Ali Mirjamali.) 393 394 Changes to past timestamps 395 396 Finish moving to 'backzone' the location-based zones whose 397 timestamps since 1970 are duplicates; adjust links accordingly. 398 This change ordinarily affects only pre-1970 timestamps, and with 399 the new PACKRATLIST option it does not affect any timestamps. 400 In this round the affected zones are Antarctica/Vostok, 401 Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, 402 Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, 403 Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, 404 Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, 405 Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, 406 Pacific/Wake and Pacific/Wallis, and the affected links are 407 Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, 408 Pacific/Truk, and Pacific/Yap. 409 410 From fall 1994 through fall 1995, Shanks wrote that Crimea's 411 DST transitions were at 02:00 standard time, not at 00:00. 412 (Thanks to Michael Deckers.) 413 414 Iran adopted standard time in 1935, not 1946. In 1977 it observed 415 DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 416 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 417 transition was on 05-27, not 03-21. 418 (Thanks to Roozbeh Pournader and Francis Santoni.) 419 420 Chile's observance of -04 from 1946-08-29 through 1947-03-31 was 421 considered DST, not standard time. Santiago and environs had moved 422 their clocks back to rejoin the rest of mainland Chile; put this 423 change at the end of 1946-08-28. (Thanks to Michael Deckers.) 424 425 Some old, small clock transitions have been removed, as people at 426 the time did not change their clocks. This affects Asia/Hong_Kong 427 in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. 428 429 Changes to zone name 430 431 Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in 432 English now. Spelling of other names in Ukraine has not yet 433 demonstrably changed in common English practice so for now these 434 names retain old spellings, as in other countries (e.g., 435 Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). 436 437 Changes to code 438 439 zic has a new option '-R @N' to output explicit transitions < N. 440 (Need suggested by Almaz Mingaleev.) 441 442 'zic -r @N' no longer outputs bad data when N < first transition. 443 (Problem introduced in 2021d and reported by Peter Krefting.) 444 445 zic now checks its input for NUL bytes and unterminated lines, and 446 now supports input line lengths up to 2048 (not 512) bytes. 447 448 gmtime and related code now use the abbreviation "UTC" not "GMT". 449 POSIX is being revised to require this. 450 451 When tzset and related functions set vestigial static variables 452 like tzname, they now prefer specified timestamps to unspecified ones. 453 (Problem reported by Almaz Mingaleev.) 454 455 zic no longer complains "can't determine time zone abbreviation to 456 use just after until time" when a transition to a new standard 457 time occurs simultaneously with the first DST fallback transition. 458 459 Changes to build procedure 460 461 Source data in vanguard form now uses the %z notation, introduced 462 in release 2015f. For example, for America/Sao_Paulo vanguard 463 form contains the zone continuation line "-3:00 Brazil %z", which 464 is simpler and more reliable than the line "-3:00 Brazil -03/-02" 465 used in main and rearguard forms. The plan is for the main form 466 to use %z eventually; in the meantime maintainers of zi parsers 467 are encouraged to test the parsers on vanguard.zi. 468 469 The Makefile has a new PACKRATLIST option to select a subset of 470 'backzone'. For example, 'make PACKRATDATA=backzone 471 PACKRATLIST=zone.tab' now generates TZif files identical to those 472 of the global-tz project. 473 474 The Makefile has a new tailored_tarballs target for generating 475 special-purpose tarballs. It generalizes and replaces the 476 rearguard_tarballs target and related targets and macros, which 477 are now obsolescent. 478 479 'make install' now defaults LOCALTIME to Factory not GMT, 480 which means the default abbreviation is now "-00" not "GMT". 481 482 Remove the posix_packrat target, marked obsolescent in 2016a. 483 484 485 Release 2022a - 2022-03-15 23:02:01 -0700 486 487 Briefly: 488 Palestine will spring forward on 2022-03-27, not -03-26. 489 zdump -v now outputs better failure indications. 490 Bug fixes for code that reads corrupted TZif data. 491 492 Changes to future timestamps 493 494 Palestine will spring forward on 2022-03-27, not 2022-03-26. 495 (Thanks to Heba Hamad.) Predict future transitions for first 496 Sunday >= March 25. Additionally, predict fallbacks to be the first 497 Friday on or after October 23, not October's last Friday, to be more 498 consistent with recent practice. The first differing fallback 499 prediction is on 2025-10-24, not 2025-10-31. 500 501 Changes to past timestamps 502 503 From 1992 through spring 1996, Ukraine's DST transitions were at 504 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) 505 506 Chile's Santiago Mean Time and its LMT precursor have been adjusted 507 eastward by 1 second to align with past and present law. 508 509 Changes to commentary 510 511 Add several references for Chile's 1946/1947 transitions, some of 512 which only affected portions of the country. 513 514 Changes to code 515 516 Fix bug when mktime gets confused by truncated TZif files with 517 unspecified local time. (Problem reported by Almaz Mingaleev.) 518 519 Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. 520 (Problem reported by Christos Zoulas.) 521 522 When reading a version 2 or later TZif file, the TZif reader now 523 validates the version 1 header and data block only enough to skip 524 over them, as recommended by RFC 8536 section 4. Also, the TZif 525 reader no longer mistakenly attempts to parse a version 1 TZIf 526 file header as a TZ string. 527 528 zdump -v now outputs "(localtime failed)" and "(gmtime failed)" 529 when local time and UT cannot be determined for a timestamp. 530 531 Changes to build procedure 532 533 Distribution tarballs now use standard POSIX.1-1988 ustar format 534 instead of GNU format. Although the formats are almost identical 535 for these tarballs, ustar headers' magic fields contain "ustar" 536 instead of "ustar ", and their version fields contain "00" instead 537 of " ". The two formats are planned to diverge more significantly 538 for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar 539 format becomes obsolete and the tarballs switch to pax format, an 540 extension of ustar. For details about these formats, please see 541 "pax - portable archive interchange", IEEE Std 1003.1-2017, 542 <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>. 543 544 545 Release 2021e - 2021-10-21 18:41:00 -0700 546 547 Changes to future timestamps 548 549 Palestine will fall back 10-29 (not 10-30) at 01:00. 550 (Thanks to P Chan and Heba Hemad.) 551 552 553 Release 2021d - 2021-10-15 13:48:18 -0700 554 555 Briefly: 556 Fiji suspends DST for the 2021/2022 season. 557 'zic -r' marks unspecified timestamps with "-00". 558 559 Changes to future timestamps 560 561 Fiji will suspend observance of DST for the 2021/2022 season. 562 Assume for now that it will return next year. (Thanks to Jashneel 563 Kumar and P Chan.) 564 565 Changes to code 566 567 'zic -r' now uses "-00" time zone abbreviations for intervals 568 with UT offsets that are unspecified due to -r truncation. 569 This implements a change in draft Internet RFC 8536bis. 570 571 572 Release 2021c - 2021-10-01 14:21:49 -0700 573 574 Briefly: 575 Revert most 2021b changes to 'backward'. 576 Fix 'zic -b fat' bug in pre-1970 32-bit data. 577 Fix two Link line typos. 578 Distribute SECURITY file. 579 580 This release is intended as a bugfix release, to fix compatibility 581 problems and typos reported since 2021b was released. 582 583 Changes to Link directives 584 585 Revert almost all of 2021b's changes to the 'backward' file, 586 by moving Link directives back to where they were in 2021a. 587 Although 'zic' doesn't care which source file contains a Link 588 directive, some downstream uses ran into trouble with the move. 589 (Problem reported by Stephen Colebourne for Joda-Time.) 590 591 Fix typo that linked Atlantic/Jan_Mayen to the wrong location 592 (problem reported by Chris Walton). 593 594 Fix 'backzone' typo that linked America/Virgin to the wrong 595 location (problem reported by Michael Deckers). 596 597 Changes to code 598 599 Fix a bug in 'zic -b fat' that caused old timestamps to be 600 mishandled in 32-bit-only readers (problem reported by Daniel 601 Fischer). 602 603 Changes to documentation 604 605 Distribute the SECURITY file (problem reported by Andreas Radke). 606 607 608 Release 2021b - 2021-09-24 16:23:00 -0700 609 610 Briefly: 611 Jordan now starts DST on February's last Thursday. 612 Samoa no longer observes DST. 613 Merge more location-based Zones whose timestamps agree since 1970. 614 Move some backward-compatibility links to 'backward'. 615 Rename Pacific/Enderbury to Pacific/Kanton. 616 Correct many pre-1993 transitions in Malawi, Portugal, etc. 617 zic now creates each output file or link atomically. 618 zic -L no longer omits the POSIX TZ string in its output. 619 zic fixes for truncation and leap second table expiration. 620 zic now follows POSIX for TZ strings using all-year DST. 621 Fix some localtime crashes and bugs in obscure cases. 622 zdump -v now outputs more-useful boundary cases. 623 tzfile.5 better matches a draft successor to RFC 8536. 624 A new file SECURITY. 625 626 This release is prompted by recent announcements by Jordan and Samoa. 627 It incorporates many other changes that had accumulated since 2021a. 628 However, it omits most proposed changes that merged all Zones 629 agreeing since 1970, as concerns were raised about doing too many of 630 these changes at once. It does keeps some of these changes in the 631 interest of making tzdb more equitable one step at a time; see 632 "Merge more location-based Zones" below. 633 634 Changes to future timestamps 635 636 Jordan now starts DST on February's last Thursday. 637 (Thanks to Steffen Thorsen.) 638 639 Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) 640 641 Changes to zone name 642 643 Rename Pacific/Enderbury to Pacific/Kanton. When we added 644 Enderbury in 1993, we did not know that it is uninhabited and that 645 Kanton (population two dozen) is the only inhabited location in 646 that timezone. The old name is now a backward-compatibility link. 647 648 Changes to past timestamps 649 650 Correct many pre-1993 transitions, fixing entries originally 651 derived from Shanks, Whitman, and Mundell. The fixes include: 652 - Barbados: standard time was introduced in 1911, not 1932; and 653 DST was observed in 1942-1944 654 - Cook Islands: In 1899 they switched from east to west of GMT, 655 celebrating Christmas for two days. They (and Niue) switched 656 to standard time in 1952, not 1901. 657 - Guyana: corrected LMT for Georgetown; the introduction of 658 standard time in 1911, not 1915; and corrections to 1975 and 659 1992 transitions 660 - Kanton: uninhabited before 1937-08-31 661 - Niue: only observed -11:20 from 1952 through 1964, then went to 662 -11 instead of -11:30 663 - Portugal: DST was observed in 1950 664 - Tonga: corrected LMT; the introduction of standard time in 1945, 665 not 1901; and corrections to the transition from +12:20 to +13 666 in 1961, not 1941 667 Additional fixes to entries in the 'backzone' file include: 668 - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 669 - The Gambia: 1933 and 1942 transitions 670 - Malawi: several 1911 through 1925 transitions 671 - Sierra Leone: several 1913 through 1941 transitions, and DST 672 was NOT observed in 1957 through 1962 673 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and 674 Alois Treindl.) 675 676 Merge more location-based Zones whose timestamps agree since 1970, 677 as pre-1970 timestamps are out of scope. This is part of a 678 process that has been ongoing since 2013. This does not affect 679 post-1970 timestamps, and timezone historians who build with 'make 680 PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. 681 When merging, keep the most-populous location's data, and move 682 data for other locations to 'backzone' with a backward 683 link in 'backward'. For example, move America/Creston data to 684 'backzone' with a link in 'backward' from America/Phoenix because 685 the two timezones' timestamps agree since 1970; this change 686 affects some pre-1968 timestamps in America/Creston because 687 Creston and Phoenix disagreed before 1968. The affected Zones 688 are Africa/Accra, America/Atikokan, America/Blanc-Sablon, 689 America/Creston, America/Curacao, America/Nassau, 690 America/Port_of_Spain, Antarctica/DumontDUrville, and 691 Antarctica/Syowa. 692 693 Changes to maintenance procedure 694 695 The new file SECURITY covers how to report security-related bugs. 696 697 Several backward-compatibility links have been moved to the 698 'backward' file. These links, which range from Africa/Addis_Ababa 699 to Pacific/Saipan, are only for compatibility with now-obsolete 700 guidelines suggesting an entry for every ISO 3166 code. 701 The intercontinental convenience links Asia/Istanbul and 702 Europe/Nicosia have also been moved to 'backward'. 703 704 Changes to code 705 706 zic now creates each output file or link atomically, 707 possibly by creating a temporary file and then renaming it. 708 This avoids races where a TZ setting would temporarily stop 709 working while zic was installing a replacement file or link. 710 711 zic -L no longer omits the POSIX TZ string in its output. 712 Starting with 2020a, zic -L truncated its output according to the 713 "Expires" directive or "#expires" comment in the leapseconds file. 714 The resulting TZif files omitted daylight saving transitions after 715 the leap second table expired, which led to far less accurate 716 predictions of times after the expiry. Although future timestamps 717 cannot be converted accurately in the presence of leap seconds, it 718 is more accurate to convert near-future timestamps with a few 719 seconds error than with an hour error, so zic -L no longer 720 truncates output in this way. 721 722 Instead, when zic -L is given the "Expires" directive, it now 723 outputs the expiration by appending a no-change entry to the leap 724 second table. Although this should work well with most TZif 725 readers, it does not conform to Internet RFC 8536 and some pickier 726 clients (including tzdb 2017c through 2021a) reject it, so 727 "Expires" directives are currently disabled by default. To enable 728 them, set the EXPIRES_LINE Makefile variable. If a TZif file uses 729 this new feature it is marked with a new TZif version number 4, 730 a format intended to be documented in a successor to RFC 8536. 731 732 zic -L LEAPFILE -r @LO no longer generates an invalid TZif file 733 that omits leap second information for the range LO..B when LO 734 falls between two leap seconds A and B. Instead, it generates a 735 TZif version 4 file that represents the previously missing 736 information. 737 738 The TZif reader now allows the leap second table to begin with a 739 correction other than -1 or +1, and to contain adjacent 740 transitions with equal corrections. This supports TZif version 4. 741 742 The TZif reader now lets leap seconds occur less than 28 days 743 apart. This supports possible future TZif extensions. 744 745 Fix bug that caused 'localtime' etc. to crash when TZ was 746 set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does 747 not conform to POSIX but does conform to Internet RFC 8536. 748 749 Fix another bug that caused 'localtime' etc. to crash when TZ was 750 set to a POSIX-conforming but unusual TZ string like 751 "EST5EDT4,0/0,J365/0", where almost all the year is DST. 752 753 Fix yet another bug that caused 'localtime' etc. to mishandle slim 754 TZif files containing leap seconds after the last explicit 755 transition in the table, or when handling far-future timestamps 756 in slim TZif files lacking leap seconds. 757 758 Fix localtime misbehavior involving positive leap seconds. 759 This change affects only behavior for "right" system time, 760 which contains leap seconds, and only if the UT offset is 761 not a multiple of 60 seconds when a positive leap second occurs. 762 (No such timezone exists in tzdb, luckily.) Without the fix, 763 the timestamp was ambiguous during a positive leap second. 764 With the fix, any seconds occurring after a positive leap second 765 and within the same localtime minute are counted through 60, not 766 through 59; their UT offset (tm_gmtoff) is the same as before. 767 Here is how the fix affects timestamps in a timezone with UT 768 offset +01:23:45 (5025 seconds) and with a positive leap second at 769 1972-06-30 23:59:60 UTC (78796800): 770 771 time_t without the fix with the fix 772 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 773 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 774 ... 775 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 776 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 777 778 Fix an unlikely bug that caused 'localtime' etc. to misbehave if 779 civil time changes a few seconds before time_t wraps around, when 780 leap seconds are enabled. 781 782 Fix bug in zic -r; in some cases, the dummy time type after the 783 last time transition disagreed with the TZ string, contrary to 784 Internet RFC 8563 section 3.3. 785 786 Fix a bug with 'zic -r @X' when X is a negative leap second that 787 has a nonnegative correction. Without the fix, the output file 788 was truncated so that X appeared to be a positive leap second. 789 Fix a similar, even less likely bug when truncating at a positive 790 leap second that has a nonpositive correction. 791 792 zic -r now reports an error if given rolling leap seconds, as this 793 usage has never generally worked and is evidently unused. 794 795 zic now generates a POSIX-conforming TZ string for TZif files 796 where all-year DST is predicted for the indefinite future. 797 For example, for all-year Eastern Daylight Time, zic now generates 798 "XXX3EDT4,0/0,J365/23" where it previously generated 799 "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for 800 noting the possibility of POSIX conformance.) 801 802 zic.c no longer requires sys/wait.h (thanks to spazmodius for 803 noting it wasn't needed). 804 805 When reading slim TZif files, zdump no longer mishandles leap 806 seconds on the rare platforms where time_t counts leap seconds, 807 fixing a bug introduced in 2014g. 808 809 zdump -v now outputs timestamps at boundaries of what localtime 810 and gmtime can represent, instead of the less useful timestamps 811 one day after the minimum and one day before the maximum. 812 (Thanks to Arthur David Olson for prototype code, and to Manuela 813 Friedrich for debugging help.) 814 815 zdump's -c and -t options are now consistently inclusive for the 816 lower time bound and exclusive for the upper. Formerly they were 817 inconsistent. (Confusion noted by Martin Burnicki.) 818 819 Changes to build procedure 820 821 You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to 822 non-POSIX hosts where malloc doesn't set errno. 823 (Problem reported by Jan Engelhardt.) 824 825 Changes to documentation 826 827 tzfile.5 better matches a draft successor to RFC 8536 828 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>. 829 830 831 Release 2021a - 2021-01-24 10:54:57 -0800 832 833 Changes to future timestamps 834 835 South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. 836 (Thanks to Steffen Thorsen.) 837 838 839 Release 2020f - 2020-12-29 00:17:46 -0800 840 841 Change to build procedure 842 843 'make rearguard_tarballs' no longer generates a bad rearguard.zi, 844 fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) 845 846 847 Release 2020e - 2020-12-22 15:14:34 -0800 848 849 Briefly: 850 Volgograd switches to Moscow time on 2020-12-27 at 02:00. 851 852 Changes to future timestamps 853 854 Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. 855 (Thanks to Alexander Krivenyshev and Stepan Golosunov.) 856 857 Changes to past timestamps 858 859 Correct many pre-1986 transitions, fixing entries originally 860 derived from Shanks. The fixes include: 861 - Australia: several 1917 through 1971 transitions 862 - The Bahamas: several 1941 through 1945 transitions 863 - Bermuda: several 1917 through 1956 transitions 864 - Belize: several 1942 through 1968 transitions 865 - Ghana: several 1915 through 1956 transitions 866 - Israel and Palestine: several 1940 through 1985 transitions 867 - Kenya and adjacent: several 1908 through 1960 transitions 868 - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 869 through 1919 transitions 870 - Seychelles: the introduction of standard time in 1907, not 1906 871 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition 872 (Thanks to P Chan.) 873 874 Because of the Australia change, Australia/Currie (King Island) is 875 no longer needed, as it is identical to Australia/Hobart for all 876 timestamps since 1970 and was therefore created by mistake. 877 Australia/Currie has been moved to the 'backward' file and its 878 corrected data moved to the 'backzone' file. 879 880 Changes to past time zone abbreviations and DST flags 881 882 To better match legislation in Turks and Caicos, the 2015 shift to 883 year-round observance of -04 is now modeled as AST throughout before 884 returning to Eastern Time with US DST in 2018, rather than as 885 maintaining EDT until 2015-11-01. (Thanks to P Chan.) 886 887 Changes to documentation 888 889 The zic man page now documents zic's coalescing of transitions 890 when a zone falls back just before DST springs forward. 891 892 893 Release 2020d - 2020-10-21 11:24:13 -0700 894 895 Briefly: 896 Palestine ends DST earlier than predicted, on 2020-10-24. 897 898 Changes to past and future timestamps 899 900 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 901 as previously predicted (thanks to Sharef Mustafa.) Its 902 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen 903 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and 904 its spring 2020 transition was on March 28 at 00:00, not March 27 905 (thanks to Pierre Cashon.) This affects Asia/Gaza and 906 Asia/Hebron. Assume future spring and fall transitions will be on 907 the Saturday preceding the last Sunday of March and October, 908 respectively. 909 910 911 Release 2020c - 2020-10-16 11:15:53 -0700 912 913 Briefly: 914 Fiji starts DST later than usual, on 2020-12-20. 915 916 Changes to future timestamps 917 918 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as 919 previously predicted. DST will still end on 2021-01-17. 920 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that 921 the later-than-usual start date is a one-time departure from the 922 recent pattern. 923 924 Changes to build procedure 925 926 Rearguard tarballs now contain an empty file pacificnew. 927 Some older downstream software expects this file to exist. 928 (Problem reported by Mike Cullinan.) 929 930 931 Release 2020b - 2020-10-06 18:35:04 -0700 932 933 Briefly: 934 Revised predictions for Morocco's changes starting in 2023. 935 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. 936 Macquarie Island has stayed in sync with Tasmania since 2011. 937 Casey, Antarctica is at +08 in winter and +11 in summer. 938 zic no longer supports -y, nor the TYPE field of Rules. 939 940 Changes to future timestamps 941 942 Morocco's spring-forward after Ramadan is now predicted to occur 943 no sooner than two days after Ramadan, instead of one day. 944 (Thanks to Milamber.) The first altered prediction is for 2023, 945 now predicted to spring-forward on April 30 instead of April 23. 946 947 Changes to past and future timestamps 948 949 Casey Station, Antarctica has been using +08 in winter and +11 in 950 summer since 2018. The most recent transition from +08 to +11 was 951 2020-10-04 00:01. Also, Macquarie Island has been staying in 952 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) 953 954 Changes to past and future time zone abbreviations and DST flags 955 956 Canada's Yukon, represented by America/Whitehorse and 957 America/Dawson, changes its time zone rules from -08/-07 to 958 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. 959 This change affects only the time zone abbreviation (MST vs PDT) 960 and daylight saving flag for the period between the two dates. 961 (Thanks to Andrew G. Smith.) 962 963 Changes to past timestamps 964 965 Correct several transitions for Hungary for 1918/1983. 966 For example, the 1983-09-25 fall-back was at 01:00, not 03:00. 967 (Thanks to Gza Nyry.) Also, the 1890 transition to standard 968 time was on 11-01, not 10-01 (thanks to Michael Deckers). 969 970 The 1891 French transition was on March 16, not March 15. The 971 1911-03-11 French transition was at midnight, not a minute later. 972 Monaco's transitions were on 1892-06-01 and 1911-03-29, not 973 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) 974 975 Changes to code 976 977 Support for zic's long-obsolete '-y YEARISTYPE' option has been 978 removed and, with it, so has support for the TYPE field in Rule 979 lines, which is now reserved for compatibility with earlier zic. 980 These features were previously deprecated in release 2015f. 981 (Thanks to Tim Parenti.) 982 983 zic now defaults to '-b slim' instead of to '-b fat'. 984 985 zic's new '-l -' and '-p -' options uninstall any existing 986 localtime and posixrules files, respectively. 987 988 The undocumented and ineffective tzsetwall function has been 989 removed. 990 991 Changes to build procedure 992 993 The Makefile now defaults POSIXRULES to '-', so the posixrules 994 feature (obsolete as of 2019b) is no longer installed by default. 995 996 Changes to documentation and commentary 997 998 The long-obsolete files pacificnew, systemv, and yearistype.sh have 999 been removed from the distribution. (Thanks to Tim Parenti.) 1000 1001 1002 Release 2020a - 2020-04-23 16:03:47 -0700 1003 1004 Briefly: 1005 Morocco springs forward on 2020-05-31, not 2020-05-24. 1006 Canada's Yukon advanced to -07 year-round on 2020-03-08. 1007 America/Nuuk renamed from America/Godthab. 1008 zic now supports expiration dates for leap second lists. 1009 1010 Changes to future timestamps 1011 1012 Morocco's second spring-forward transition in 2020 will be May 31, 1013 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) 1014 Adjust future-year predictions to use the first Sunday after the 1015 day after Ramadan, not the first Sunday after Ramadan. 1016 1017 Canada's Yukon, represented by America/Whitehorse and 1018 America/Dawson, advanced to -07 year-round, beginning with its 1019 spring-forward transition on 2020-03-08, and will not fall back on 1020 2020-11-01. Although a government press release calls this 1021 "permanent Pacific Daylight Saving Time", we prefer MST for 1022 consistency with nearby Dawson Creek, Creston, and Fort Nelson. 1023 (Thanks to Tim Parenti.) 1024 1025 Changes to past timestamps 1026 1027 Shanghai observed DST in 1919. (Thanks to Phake Nick.) 1028 1029 Changes to timezone identifiers 1030 1031 To reflect current usage in English better, America/Godthab has 1032 been renamed to America/Nuuk. A backwards-compatibility link 1033 remains for the old name. 1034 1035 Changes to code 1036 1037 localtime.c no longer mishandles timestamps after the last 1038 transition in a TZif file with leap seconds and with daylight 1039 saving time transitions projected into the indefinite future. 1040 For example, with TZ='America/Los_Angeles' with leap seconds, 1041 zdump formerly reported a DST transition on 2038-03-14 1042 from 01:59:32.999... to 02:59:33 instead of the correct transition 1043 from 01:59:59.999... to 03:00:00. 1044 1045 zic -L now supports an Expires line in the leapseconds file, and 1046 truncates the TZif output accordingly. This propagates leap 1047 second expiration information into the TZif file, and avoids the 1048 abovementioned localtime.c bug as well as similar bugs present in 1049 many client implementations. If no Expires line is present, zic 1050 -L instead truncates the TZif output based on the #expires comment 1051 present in leapseconds files distributed by tzdb 2018f and later; 1052 however, this usage is obsolescent. For now, the distributed 1053 leapseconds file has an Expires line that is commented out, so 1054 that the file can be fed to older versions of zic which ignore the 1055 commented-out line. Future tzdb distributions are planned to 1056 contain a leapseconds file with an Expires line. 1057 1058 The configuration macros HAVE_TZNAME and USG_COMPAT should now be 1059 set to 1 if the system library supports the feature, and 2 if not. 1060 As before, these macros are nonzero if tzcode should support the 1061 feature, zero otherwise. 1062 1063 The configuration macro ALTZONE now has the same values with the 1064 same meaning as HAVE_TZNAME and USG_COMPAT. 1065 1066 The code's defense against CRLF in leap-seconds.list is now 1067 portable to POSIX awk. (Problem reported by Deborah Goldsmith.) 1068 1069 Although the undocumented tzsetwall function is not changed in 1070 this release, it is now deprecated in preparation for removal in 1071 future releases. Due to POSIX requirements, tzsetwall has not 1072 worked for some time. Any code that uses it should instead use 1073 tzalloc(NULL) or, if portability trumps thread-safety, should 1074 unset the TZ environment variable. 1075 1076 Changes to commentary 1077 1078 The les-de-la-Madeleine and the Listuguj reserve are noted as 1079 following America/Halifax, and comments about Yukon's "south" and 1080 "north" have been corrected to say "east" and "west". (Thanks to 1081 Jeffery Nichols.) 1082 1083 1084 Release 2019c - 2019-09-11 08:59:48 -0700 1085 1086 Briefly: 1087 Fiji observes DST from 2019-11-10 to 2020-01-12. 1088 Norfolk Island starts observing Australian-style DST. 1089 1090 Changes to future timestamps 1091 1092 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 1093 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) 1094 Adjust future guesses accordingly. 1095 1096 Norfolk Island will observe Australian-style DST starting in 1097 spring 2019. The first transition is on 2019-10-06. (Thanks to 1098 Kyle Czech and Michael Deckers.) 1099 1100 Changes to past timestamps 1101 1102 Many corrections to time in Turkey from 1940 through 1985. 1103 (Thanks to Oya Vula via Alois Treindl, and to Kvan Yazan.) 1104 1105 The Norfolk Island 1975-03-02 transition was at 02:00 standard 1106 time, not 02:00 DST. (Thanks to Michael Deckers.) 1107 1108 South Korea observed DST from 1948 through 1951. Although this 1109 info was supposed to appear in release 2014j, a typo inadvertently 1110 suppressed the change. (Thanks to Alois Treindl.) 1111 1112 Detroit observed DST in 1967 and 1968 following the US DST rules, 1113 except that its 1967 DST began on June 14 at 00:01. (Thanks to 1114 Alois Treindl for pointing out that the old data entries were 1115 probably wrong.) 1116 1117 Fix several errors in pre-1970 transitions in Perry County, IN. 1118 (Thanks to Alois Treindl for pointing out the 1967/9 errors.) 1119 1120 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver 1121 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 1122 10-06. In 1945 Knigsberg (now Kaliningrad) switched from +01/+02 1123 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated 1124 EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 1125 Knigsberg switched to +03 on 04-07 not 01-01. 1126 1127 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 1128 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) 1129 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. 1130 1131 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. 1132 (Thanks to Michael Deckers.) 1133 1134 Changes to past time zone abbreviations and DST flags 1135 1136 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, 1137 is now flagged as DST and is abbreviated HKWT not HKT. 1138 1139 Changes to code 1140 1141 leapseconds.awk now relies only on its input data, rather than 1142 also relying on its comments. (Inspired by code from Dennis 1143 Ferguson and Chris Woodbury.) 1144 1145 The code now defends against CRLFs in leap-seconds.list. 1146 (Thanks to Brian Inglis and Chris Woodbury.) 1147 1148 Changes to documentation and commentary 1149 1150 theory.html discusses leap seconds. (Thanks to Steve Summit.) 1151 1152 Nashville's newspapers dueled about the time of day in the 1950s. 1153 (Thanks to John Seigenthaler.) 1154 1155 Liechtenstein observed Swiss DST in 1941/2. 1156 (Thanks to Alois Treindl.) 1157 1158 1159 Release 2019b - 2019-07-01 00:09:53 -0700 1160 1161 Briefly: 1162 Brazil no longer observes DST. 1163 'zic -b slim' outputs smaller TZif files; please try it out. 1164 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 1165 1166 Changes to future timestamps 1167 1168 Brazil has canceled DST and will stay on standard time indefinitely. 1169 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 1170 Oliveira.) 1171 1172 Predictions for Morocco now go through 2087 instead of 2037, to 1173 work around a problem on newlib when using TZif files output by 1174 zic 2019a or earlier. (Problem reported by David Gauchard.) 1175 1176 Changes to past and future timestamps 1177 1178 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 1179 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 1180 future transitions to be March's last Friday at 00:00. 1181 1182 Changes to past timestamps 1183 1184 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 1185 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 1186 not 09-15 at 00:00. In 1946 its spring-forward transition was on 1187 04-21 at 00:00, not the previous day at 03:30. From 1946 through 1188 1952 its fall-back transitions occurred at 04:30, not at 03:30. 1189 In 1947 its fall-back transition was on 11-30, not 12-30. 1190 (Thanks to P Chan.) 1191 1192 Changes to past time zone abbreviations 1193 1194 Italy's 1866 transition to Rome Mean Time was on December 12, not 1195 September 22. This affects only the time zone abbreviation for 1196 Europe/Rome between those dates. (Thanks to Stephen Trainor and 1197 Luigi Rosa.) 1198 1199 Changes affecting metadata only 1200 1201 Add info about the Crimea situation in zone1970.tab and zone.tab. 1202 (Problem reported by Serhii Demediuk.) 1203 1204 Changes to code 1205 1206 zic's new -b option supports a way to control data bloat and to 1207 test for year-2038 bugs in software that reads TZif files. 1208 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 1209 for example, changing from fat to slim shrinks the Europe/London 1210 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 1211 files represent the same set of timestamps and use the same TZif 1212 format as documented in tzfile(5) and in Internet RFC 8536. 1213 Fat format attempts to work around bugs or incompatibilities in 1214 older software, notably software that mishandles 64-bit TZif data 1215 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 1216 Slim format is more efficient and does not work around 64-bit bugs 1217 or obsolete TZ strings. Currently zic defaults to fat format 1218 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 1219 out-of-the-box default is intended to change in future releases 1220 as the buggy software often mishandles timestamps anyway. 1221 1222 zic no longer treats a set of rules ending in 2037 specially. 1223 Previously, zic assumed that such a ruleset meant that future 1224 timestamps could not be predicted, and therefore omitted a 1225 POSIX-like TZ string in the TZif output. The old behavior is no 1226 longer needed for current tzdata, and caused problems with newlib 1227 when used with older tzdata (reported by David Gauchard). 1228 1229 zic no longer generates some artifact transitions. For example, 1230 Europe/London no longer has a no-op transition in January 1996. 1231 1232 Changes to build procedure 1233 1234 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 1235 by a percent or so. 1236 1237 Changes to documentation and commentary 1238 1239 The Makefile now documents the POSIXRULES macro as being obsolete, 1240 and similarly, zic's -p POSIXRULES option is now documented as 1241 being obsolete. Although the POSIXRULES feature still exists and 1242 works as before, in practice it is rarely used for its intended 1243 purpose, and it does not work either in the default reference 1244 implementation (for timestamps after 2037) or in common 1245 implementations such as GNU/Linux (for contemporary timestamps). 1246 Since POSIXRULES was designed primarily as a temporary transition 1247 facility for System V platforms that died off decades ago, it is 1248 being decommissioned rather than institutionalized. 1249 1250 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 1251 1252 1253 Release 2019a - 2019-03-25 22:01:33 -0700 1254 1255 Briefly: 1256 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 1257 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 1258 1259 Changes to past and future timestamps 1260 1261 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 1262 previously predicted. Adjust our prediction by guessing that spring 1263 transitions will be between 24 and 30 March, which matches recent practice 1264 since 2016. (Thanks to Even Scharning and Tim Parenti.) 1265 1266 Metlakatla ended its observance of Pacific standard time, 1267 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 1268 Stanley and Tim Parenti.) 1269 1270 Changes to past timestamps 1271 1272 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 1273 (Thanks to Alois Treindl and Isaac Starkman.) 1274 1275 Changes to time zone abbreviations 1276 1277 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 1278 of being a separate zone that generates the abbreviation "UCT", 1279 which nowadays is typically a typo. (Problem reported by Isiah 1280 Meadows.) 1281 1282 Changes to code 1283 1284 zic now has an -r option to limit the time range of output data. 1285 For example, 'zic -r @1000000000' limits the output data to 1286 timestamps starting 1000000000 seconds after the Epoch. 1287 This helps shrink output size and can be useful for applications 1288 not needing the full timestamp history, such as TZDIST truncation; 1289 see Internet RFC 8536 section 5.1. (Inspired by a feature request 1290 from Christopher Wong, helped along by bug reports from Wong and 1291 from Tim Parenti.) 1292 1293 Changes to documentation 1294 1295 Mention Internet RFC 8536 (February 2019), which documents TZif. 1296 1297 tz-link.html now cites tzdata-meta 1298 <https://tzdata-meta.timtimeonline.com/>. 1299 1300 1301 Release 2018i - 2018-12-30 11:05:43 -0800 1302 1303 Briefly: 1304 So Tom and Prncipe switches from +01 to +00 on 2019-01-01. 1305 1306 Changes to future timestamps 1307 1308 Due to a change in government, So Tom and Prncipe switches back 1309 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 1310 Nasardinov and Michael Deckers.) 1311 1312 1313 Release 2018h - 2018-12-23 17:59:32 -0800 1314 1315 Briefly: 1316 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 1317 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 1318 Metlakatla, Alaska observes PST this winter only. 1319 Guess Morocco will continue to adjust clocks around Ramadan. 1320 Add predictions for Iran from 2038 through 2090. 1321 1322 Changes to future timestamps 1323 1324 Guess that Morocco will continue to fall back just before and 1325 spring forward just after Ramadan, the practice since 2012. 1326 (Thanks to Maamar Abdelkader.) This means Morocco will observe 1327 negative DST during Ramadan in main and vanguard formats, and in 1328 rearguard format it stays in the +00 timezone and observes 1329 ordinary DST in all months other than Ramadan. As before, extend 1330 this guesswork to the year 2037. As a consequence, Morocco is 1331 scheduled to observe three DST transitions in some Gregorian years 1332 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 1333 calendars. 1334 1335 The table of exact transitions for Iranian DST has been extended. 1336 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 1337 It now cuts off before 2091 as there is doubt about how the Persian 1338 calendar will treat 2091. This change predicts DST transitions in 1339 2038-9, 2042-3, and 2046-7 to occur one day later than previously 1340 predicted. As before, post-cutoff transitions are approximated. 1341 1342 Changes to past and future timestamps 1343 1344 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 1345 +05 on 2018-12-21. This is a zone split as Qostanay (aka 1346 Kostanay) did not switch, so create a zone Asia/Qostanay. 1347 1348 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 1349 It did not change clocks that day and remains on -08 this winter. 1350 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 1351 rules next spring, so this change affects only timestamps 1352 from 2018-11-04 through 2019-03-10. 1353 1354 Change to past timestamps 1355 1356 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 1357 not 00:00. I transcribed the time incorrectly from Shanks. 1358 (Thanks to Phake Nick.) 1359 1360 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 1361 (Thanks to Phake Nick.) 1362 1363 Guam observed DST irregularly from 1959 through 1977. 1364 (Thanks to Phake Nick.) 1365 1366 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 1367 10-01 changed standard time to +08:30 (not +08). Its transition 1368 back to +08 after WWII was on 1945-09-15, not the previous day. 1369 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 1370 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 1371 its 1952 fallback was on 11-02 (not 10-25). 1372 1373 This release contains many changes to timestamps before 1946 due 1374 to Japanese possession or occupation of Pacific/Chuuk, 1375 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 1376 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 1377 (Thanks to Phake Nick.) 1378 1379 Assume that the Spanish East Indies was like the Philippines and 1380 observed American time until the end of 1844. This affects 1381 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 1382 1383 Changes to past tm_isdst flags 1384 1385 For the recent Morocco change, the tm_isdst flag should be 1 from 1386 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 1387 Give a URL to the official decree. (Thanks to Matt Johnson.) 1388 1389 1390 Release 2018g - 2018-10-26 22:22:45 -0700 1391 1392 Briefly: 1393 Morocco switches to permanent +01 on 2018-10-28. 1394 1395 Changes to future timestamps 1396 1397 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 1398 so its clocks will not fall back as previously scheduled. 1399 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 1400 1401 Changes to code 1402 1403 When generating TZif files with leap seconds, zic no longer uses a 1404 format that trips up older 32-bit clients, fixing a bug introduced 1405 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 1406 for QTBUG-53071 now also works for TZif files with leap seconds. 1407 1408 The translator to rearguard format now rewrites the line 1409 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 1410 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 1411 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 1412 and earlier. (Reported by Christos Zoulas.) 1413 1414 Changes to past time zone abbreviations 1415 1416 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 1417 This reverts to 2011h, as the abbreviation change in 2011i was 1418 likely inadvertent. 1419 1420 Changes to documentation 1421 1422 tzfile.5 has new sections on interoperability issues. 1423 1424 1425 Release 2018f - 2018-10-18 00:14:18 -0700 1426 1427 Briefly: 1428 Volgograd moves from +03 to +04 on 2018-10-28. 1429 Fiji ends DST 2019-01-13, not 2019-01-20. 1430 Most of Chile changes DST dates, effective 2019-04-06. 1431 1432 Changes to future timestamps 1433 1434 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 1435 (Thanks to Alexander Fetisov and Stepan Golosunov.) 1436 1437 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 1438 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 1439 accordingly. 1440 1441 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 1442 time, and resume DST on the first Saturday in September at 24:00 mainland 1443 time. The changes are effective from 2019-04-06, and do not affect the 1444 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 1445 and Tim Parenti.) Adjust future predictions accordingly. 1446 1447 Changes to past timestamps 1448 1449 The 2018-05-05 North Korea 30-minute time zone change took place 1450 at 23:30 the previous day, not at 00:00 that day. 1451 1452 China's 1988 spring-forward transition was on April 17, not 1453 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 1454 (Thanks to P Chan.) 1455 1456 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 1457 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 1458 temporarily switched to +09/+10 during World War II. Macau 1459 observed DST in 1942/79, not 1961/80, and there were several 1460 errors for transition times and dates. (Thanks to P Chan.) 1461 1462 The 1948-1951 fallback transitions in Japan were at 25:00 on 1463 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 1464 zic turns this into 01:00 on the day after September's second 1465 Saturday, which is the best that POSIX or C platforms can do. 1466 1467 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 1468 paper by Li Yu, replacing more-questionable data from Shanks. 1469 1470 Changes to time zone abbreviations 1471 1472 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 1473 1474 Changes to code 1475 1476 zic now always generates TZif files where time type 0 is used for 1477 timestamps before the first transition. This simplifies the 1478 reading of TZif files and should not affect behavior of existing 1479 TZif readers because the same set of time types is used; only 1480 their internal indexes may have changed. This affects only the 1481 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 1482 EET, which previously used nonzero types for these timestamps. 1483 1484 Because of the type 0 change, zic no longer outputs a dummy 1485 transition at time -2**59 (before the Big Bang), as clients should 1486 no longer need this to handle historical timestamps correctly. 1487 This reverts a change introduced in 2013d and shrinks most TZif 1488 files by a few bytes. 1489 1490 zic now supports negative time-of-day in Rule and Leap lines, e.g., 1491 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 1492 occurs at 18:00 on the Saturday before the last Sunday in April. 1493 This behavior was documented in 2018a but the code did not 1494 entirely match the documentation. 1495 1496 localtime.c no longer requires at least one time type in TZif 1497 files that lack transitions or have a POSIX-style TZ string. This 1498 future-proofs the code against possible future extensions to the 1499 format that would allow TZif files with POSIX-style TZ strings and 1500 without transitions or time types. 1501 1502 A read-access subscript error in localtime.c has been fixed. 1503 It could occur only in TZif files with timecnt == 0, something that 1504 does not happen in practice now but could happen in future versions. 1505 1506 localtime.c no longer ignores TZif POSIX-style TZ strings that 1507 specify only standard time. Instead, these TZ strings now 1508 override the default time type for timestamps after the last 1509 transition (or for all timestamps if there are no transitions), 1510 just as DST strings specifying DST have always done. 1511 1512 leapseconds.awk now outputs "#updated" and "#expires" comments, 1513 and supports leap seconds at the ends of months other than June 1514 and December. (Inspired by suggestions from Chris Woodbury.) 1515 1516 Changes to documentation 1517 1518 New restrictions: A Rule name must start with a character that 1519 is neither an ASCII digit nor "-" nor "+", and an unquoted name 1520 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 1521 The latter restriction makes room for future extensions (a 1522 possibility noted by Tom Lane). 1523 1524 tzfile.5 now documents what time types apply before the first and 1525 after the last transition, if any. 1526 1527 Documentation now uses the spelling "timezone" for a TZ setting 1528 that determines timestamp history, and "time zone" for a 1529 geographic region currently sharing the same standard time. 1530 1531 The name "TZif" is now used for the tz binary data format. 1532 1533 tz-link.htm now mentions the A0 TimeZone Migration utilities. 1534 (Thanks to Aldrin Martoq for the link.) 1535 1536 Changes to build procedure 1537 1538 New 'make' target 'rearguard_tarballs' to build the rearguard 1539 tarball only. This is a convenience on platforms that lack lzip 1540 if you want to build the rearguard tarball. (Problem reported by 1541 Deborah Goldsmith.) 1542 1543 tzdata.zi is now more stable from release to release. (Problem 1544 noted by Tom Lane.) It is also a bit shorter. 1545 1546 tzdata.zi now can contain comment lines documenting configuration 1547 information, such as which data format was selected, which input 1548 files were used, and how leap seconds are treated. (Problems 1549 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 1550 are used these comment lines are absent, for backward 1551 compatibility. A redistributor intending to alter its copy of the 1552 files should also append "-LABEL" to the 'version' file's first 1553 line, where "LABEL" identifies the redistributor's change. 1554 1555 1556 Release 2018e - 2018-05-01 23:42:51 -0700 1557 1558 Briefly: 1559 1560 North Korea switches back to +09 on 2018-05-05. 1561 The main format uses negative DST again, for Ireland etc. 1562 'make tarballs' now also builds a rearguard tarball. 1563 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 1564 1565 Changes to past and future timestamps 1566 1567 North Korea switches back from +0830 to +09 on 2018-05-05. 1568 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 1569 and Tim Parenti.) 1570 1571 Bring back the negative-DST changes of 2018a, except be more 1572 compatible with data parsers that do not support negative DST. 1573 Also, this now affects historical timestamps in Namibia and the 1574 former Czechoslovakia, not just Ireland. The main format now uses 1575 negative DST to model timestamps in Europe/Dublin (from 1971 on), 1576 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 1577 does not affect UT offsets, only time zone abbreviations and the 1578 tm_isdst flag. Also, this does not affect rearguard or vanguard 1579 formats; effectively the main format now uses vanguard instead of 1580 rearguard format. Data parsers that do not support negative DST 1581 can still use data from the rearguard tarball described below. 1582 1583 Changes to build procedure 1584 1585 The command 'make tarballs' now also builds the tarball 1586 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 1587 except that it uses rearguard format intended for trailing-edge 1588 data parsers. 1589 1590 Changes to data format and to code 1591 1592 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 1593 suffix, which specifies whether the adjusted time is standard time 1594 or daylight saving time. If no suffix is given, daylight saving 1595 time is used if and only if the SAVE column is nonzero; this is 1596 the longstanding behavior. Although this new feature is not used 1597 in tzdata, it could be used to specify the legal time in Namibia 1598 1994-2017, as opposed to the popular time (see below). 1599 1600 Changes to past timestamps 1601 1602 From 1994 through 2017 Namibia observed DST in winter, not summer. 1603 That is, it used negative DST, as Ireland still does. This change 1604 does not affect UTC offsets; it affects only the tm_isdst flag and 1605 the abbreviation used during summer, which is now CAT, not WAST. 1606 Although (as noted by Michael Deckers) summer and winter time were 1607 both simply called "standard time" in Namibian law, in common 1608 practice winter time was considered to be DST (as noted by Stephen 1609 Colebourne). The full effect of this change is only in vanguard 1610 and main format; in rearguard format, the tm_isdst flag is still 1611 zero in winter and nonzero in summer. 1612 1613 In 1946/7 Czechoslovakia also observed negative DST in winter. 1614 The full effect of this change is only in vanguard and main 1615 formats; in rearguard format, it is modeled as plain GMT without 1616 daylight saving. Also, the dates of some 1944/5 DST transitions 1617 in Czechoslovakia have been changed. 1618 1619 1620 Release 2018d - 2018-03-22 07:05:46 -0700 1621 1622 Briefly: 1623 1624 Palestine starts DST a week earlier in 2018. 1625 Add support for vanguard and rearguard data consumers. 1626 Add subsecond precision to source data format, though not to data. 1627 1628 Changes to future timestamps 1629 1630 In 2018, Palestine starts DST on March 24, not March 31. 1631 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 1632 1633 Changes to past and future timestamps 1634 1635 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 1636 at 04:00. (Thanks to Steffen Thorsen.) 1637 1638 Changes to past timestamps 1639 1640 Historical transitions for Uruguay, represented by 1641 America/Montevideo, have been updated per official legal documents, 1642 replacing previous data mainly originating from the inventions of 1643 Shanks & Pottenger. This has resulted in adjustments ranging from 1644 30 to 90 minutes in either direction over at least two dozen 1645 distinct periods ranging from one day to several years in length. 1646 A mere handful of pre-1991 transitions are unaffected; data since 1647 then has come from more reliable contemporaneous reporting. These 1648 changes affect various timestamps in 1920-1923, 1936, 1939, 1649 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 1650 Additionally, Uruguay's pre-standard-time UT offset has been 1651 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 1652 match the location of the Observatory of the National Meteorological 1653 Institute in Montevideo. 1654 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 1655 1656 East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. 1657 (Thanks to Kerry Shetline.) 1658 1659 Fix the 1912-01-01 transition for Portugal and its colonies. 1660 This transition was at 00:00 according to the new UT offset, not 1661 according to the old one. Also assume that Cape Verde switched on 1662 the same date as the rest, not in 1907. This affects 1663 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 1664 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 1665 (Thanks to Michael Deckers.) 1666 1667 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 1668 Turks & Caicos. 1669 1670 Changes to past time zone abbreviations 1671 1672 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 1673 is no clock change associated with the transition. 1674 1675 Changes to build procedure 1676 1677 The new DATAFORM macro in the Makefile lets the installer choose 1678 among three source data formats. The idea is to lessen downstream 1679 disruption when data formats are improved. 1680 1681 * DATAFORM=vanguard installs from the latest, bleeding-edge 1682 format. DATAFORM=main (the default) installs from the format 1683 used in the 'africa' etc. files. DATAFORM=rearguard installs 1684 from a trailing-edge format. Eventually, elements of today's 1685 vanguard format should move to the main format, and similarly 1686 the main format's features should eventually move to the 1687 rearguard format. 1688 1689 * In the current version, the main and rearguard formats are 1690 identical and match that of 2018c, so this change does not 1691 affect default behavior. The vanguard format currently contains 1692 one feature not in the main format: negative SAVE values. This 1693 improves support for Ireland, which uses Irish Standard Time 1694 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 1695 supported negative SAVE values for decades, and this feature 1696 should move to the main format soon. However, it will not move 1697 to the rearguard format for quite some time because some 1698 downstream parsers do not support it. 1699 1700 * The build procedure constructs three files vanguard.zi, main.zi, 1701 and rearguard.zi, one for each format. Although the files 1702 represent essentially the same data, they may have minor 1703 discrepancies that users are not likely to notice. The files 1704 are intended for downstream data consumers and are not 1705 installed. Zoneinfo parsers that do not support negative SAVE values 1706 should start using rearguard.zi, so that they will be unaffected 1707 when the negative-DST feature moves from vanguard to main. 1708 Bleeding-edge Zoneinfo parsers that support the new features 1709 already can use vanguard.zi; in this respect, current tzcode is 1710 bleeding-edge. 1711 1712 The Makefile should now be safe for parallelized builds, and 'make 1713 -j to2050new.tzs' is now much faster on a multiprocessor host 1714 with GNU Make. 1715 1716 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 1717 prepends TZDIR/ to file names that do not begin with '/'. This is 1718 not recommended for general use, due to its security implications. 1719 (From a suggestion by Manuela Friedrich.) 1720 1721 Changes to code 1722 1723 zic now accepts subsecond precision in expressions like 1724 00:19:32.13, which is approximately the legal time of the 1725 Netherlands from 1835 to 1937. However, because it is 1726 questionable whether the few recorded uses of non-integer offsets 1727 had subsecond precision in practice, there are no plans for tzdata 1728 to use this feature. (Thanks to Steve Allen for pointing out 1729 the limitations of historical data in this area.) 1730 1731 The code is a bit more portable to MS-Windows. Installers can 1732 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 1733 reserve identifiers like 'localtime'. (Thanks to Manuela 1734 Friedrich.) 1735 1736 Changes to documentation and commentary 1737 1738 theory.html now outlines tzdb's extensions to POSIX's model for 1739 civil time, and has a section "POSIX features no longer needed" 1740 that lists POSIX API components that are now vestigial. 1741 (From suggestions by Steve Summit.) It also better distinguishes 1742 time zones from tz regions. (From a suggestion by Guy Harris.) 1743 1744 Commentary is now more consistent about using the phrase "daylight 1745 saving time", to match the C name tm_isdst. Daylight saving time 1746 need not occur in summer, and need not have a positive offset from 1747 standard time. 1748 1749 Commentary about historical transitions in Uruguay has been expanded 1750 with links to many relevant legal documents. 1751 (Thanks to Tim Parenti.) 1752 1753 Commentary now uses some non-ASCII characters with Unicode value 1754 less than U+0100, as they can be useful and should work even with 1755 older editors such as XEmacs. 1756 1757 1758 Release 2018c - 2018-01-22 23:00:44 -0800 1759 1760 Briefly: 1761 Revert Irish changes that relied on negative SAVE values. 1762 1763 Changes to tm_isdst 1764 1765 Revert the 2018a change to Europe/Dublin. As before, this change 1766 does not affect UT offsets or abbreviations; it affects only 1767 whether timestamps are considered to be standard time or 1768 daylight-saving time, as expressed in the tm_isdst flag of C's 1769 struct tm type. This reversion is intended to be a temporary 1770 workaround for problems discovered with downstream uses of 1771 releases 2018a and 2018b, which implemented Irish time by using 1772 negative SAVE values in the Eire rules of the 'europe' file. 1773 Although negative SAVE values have been part of tzcode for many 1774 years and are supported by many platforms, they were not 1775 documented before 2018a and ICU and OpenJDK do not currently 1776 support them. A mechanism to export data to platforms lacking 1777 support for negative DST is planned to be developed before the 1778 change is reapplied. (Problems reported by Deborah Goldsmith and 1779 Stephen Colebourne.) 1780 1781 Changes to past timestamps 1782 1783 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 1784 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 1785 1786 Changes to build procedure 1787 1788 The build procedure now works around mawk 1.3.3's lack of support 1789 for character class expressions. (Problem reported by Ohyama.) 1790 1791 1792 Release 2018b - 2018-01-17 23:24:48 -0800 1793 1794 Briefly: 1795 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 1796 1797 Changes to build procedure 1798 1799 The distribution now contains the file 'pacificnew' again. 1800 This file was inadvertently omitted in the 2018a distribution. 1801 (Problem reported by Matias Fonzo.) 1802 1803 1804 Release 2018a - 2018-01-12 22:29:21 -0800 1805 1806 Briefly: 1807 So Tom and Prncipe switched from +00 to +01. 1808 Brazil's DST will now start on November's first Sunday. 1809 Ireland's standard time is now in the summer, not the winter. 1810 Use Debian-style installation locations, instead of 4.3BSD-style. 1811 New zic option -t. 1812 1813 Changes to past and future timestamps 1814 1815 So Tom and Prncipe switched from +00 to +01 on 2018-01-01 at 1816 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 1817 1818 Changes to future timestamps 1819 1820 Starting in 2018 southern Brazil will begin DST on November's 1821 first Sunday instead of October's third Sunday. (Thanks to 1822 Steffen Thorsen.) 1823 1824 Changes to past timestamps 1825 1826 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 1827 been corrected. The 'backzone' and 'zone.tab' files did not agree 1828 with the 'africa' and 'zone1970.tab' files. (Problem reported by 1829 Michael Deckers.) 1830 1831 The abbreviation invented for Bolivia Summer Time (1931-2) is now 1832 BST instead of BOST, to be more consistent with the convention 1833 used for Latvian Summer Time (1918-9) and for British Summer Time. 1834 1835 Changes to tm_isdst 1836 1837 Change Europe/Dublin so that it observes Irish Standard Time (UT 1838 +01) in summer and GMT (as negative daylight-saving) in winter, 1839 instead of observing standard time (GMT) in winter and Irish 1840 Summer Time (UT +01) in summer. This change does not affect UT 1841 offsets or abbreviations; it affects only whether timestamps are 1842 considered to be standard time or daylight-saving time, as 1843 expressed in the tm_isdst flag of C's struct tm type. 1844 (Discrepancy noted by Derick Rethans.) 1845 1846 Changes to build procedure 1847 1848 The default installation locations have been changed to mostly 1849 match Debian circa 2017, instead of being designed as an add-on to 1850 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 1851 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 1852 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 1853 locations more precisely. (This responds to suggestions from 1854 Brian Inglis and from Steve Summit.) 1855 1856 The default installation procedure no longer creates the 1857 backward-compatibility link US/Pacific-New, which causes 1858 confusion during user setup (e.g., see Debian bug 815200). 1859 Use 'make BACKWARD="backward pacificnew"' to create the link 1860 anyway, for now. Eventually we plan to remove the link entirely. 1861 1862 tzdata.zi now contains a version-number comment. 1863 (Suggested by Tom Lane.) 1864 1865 The Makefile now quotes values like BACKWARD more carefully when 1866 passing them to the shell. (Problem reported by Zefram.) 1867 1868 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 1869 that have snprintf and use pre-C99 compilers. (Problem reported 1870 by Jon Skeet.) 1871 1872 Changes to code 1873 1874 zic has a new option -t FILE that specifies the location of the 1875 file that determines local time when TZ is unset. The default for 1876 this location can be configured via the new TZDEFAULT makefile 1877 macro, which defaults to /etc/localtime. 1878 1879 Diagnostics and commentary now distinguish UT from UTC more 1880 carefully; see theory.html for more information about UT vs UTC. 1881 1882 zic has been ported to GCC 8's -Wstringop-truncation option. 1883 (Problem reported by Martin Sebor.) 1884 1885 Changes to documentation and commentary 1886 1887 The zic man page now documents the longstanding behavior that 1888 times and years can be out of the usual range, with negative times 1889 counting backwards from midnight and with year 0 preceding year 1. 1890 (Problem reported by Michael Deckers.) 1891 1892 The theory.html file now mentions the POSIX limit of six chars 1893 per abbreviation, and lists alphabetic abbreviations used. 1894 1895 The files tz-art.htm and tz-link.htm have been renamed to 1896 tz-art.html and tz-link.html, respectively, for consistency with 1897 other file names and to simplify web server configuration. 1898 1899 1900 Release 2017c - 2017-10-20 14:49:34 -0700 1901 1902 Briefly: 1903 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 1904 Fiji ends DST 2018-01-14, not 2018-01-21. 1905 Namibia switches from +01/+02 to +02 on 2018-04-01. 1906 Sudan switches from +03 to +02 on 2017-11-01. 1907 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 1908 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 1909 A new file tzdata.zi now holds a small text copy of all data. 1910 The zic input format has been regularized slightly. 1911 1912 Changes to future timestamps 1913 1914 Northern Cyprus has decided to resume EU rules starting 1915 2017-10-29, thus reinstituting winter time. 1916 1917 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 1918 predicted. (Thanks to Dominic Fok.) Adjust future predictions 1919 accordingly. 1920 1921 Namibia will switch from +01 with DST to +02 all year on 1922 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 1923 at 02:00. (Thanks to Steffen Thorsen.) 1924 1925 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 1926 Atyya and Yahia Abdalla.) South Sudan is not switching, so 1927 Africa/Juba is no longer a link to Africa/Khartoum. 1928 1929 Tonga has likely ended its experiment with DST, and will not 1930 adjust its clocks on 2017-11-05. Although Tonga has not announced 1931 whether it will continue to observe DST, the IATA is assuming that 1932 it will not. (Thanks to David Wade.) 1933 1934 Turks & Caicos will switch from -04 all year to -05 with US DST on 1935 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 1936 at 02:00. (Thanks to Steffen Thorsen.) 1937 1938 Changes to past timestamps 1939 1940 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 1941 (Thanks to Arthur David Olson.) 1942 1943 Detroit did not observe DST in 1967. 1944 1945 Use railway time for Asia/Kolkata before 1941, by switching to 1946 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 1947 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 1948 1949 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 1950 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 1951 1952 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 1953 American time in 1892, not 1879. (Thanks to Michael Deckers.) 1954 1955 Adjust the 1867 transition in Alaska to better reflect the 1956 historical record, by changing it to occur on 1867-10-18 at 15:30 1957 Sitka time rather than at the start of 1867-10-17 local time. 1958 Although strictly speaking this is accurate only for Sitka, 1959 the rest of Alaska's blanks need to be filled in somehow. 1960 1961 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 1962 (Thanks to Michael Deckers.) 1963 1964 Add 7 s to the UT offset in Asia/Yangon before 1920. 1965 1966 Changes to zone names 1967 1968 Remove Canada/East-Saskatchewan from the 'backward' file, as it 1969 exceeded the 14-character limit and was an unused misnomer anyway. 1970 1971 Changes to build procedure 1972 1973 To support applications that prefer to read time zone data in text 1974 form, two zic input files tzdata.zi and leapseconds are now 1975 installed by default. The commands 'zic tzdata.zi' and 'zic -L 1976 leapseconds tzdata.zi' can reproduce the tzdata binary files 1977 without and with leap seconds, respectively. To prevent these two 1978 new files from being installed, use 'make TZDATA_TEXT=', and to 1979 suppress leap seconds from the tzdata text installation, use 'make 1980 TZDATA_TEXT=tzdata.zi'. 1981 1982 'make BACKWARD=' now suppresses backward-compatibility names 1983 like 'US/Pacific' that are defined in the 'backward' and 1984 'pacificnew' files. 1985 1986 'make check' now works on systems that lack a UTF-8 locale, 1987 or that lack the nsgmls program. Set UTF8_LOCALE to configure 1988 the name of a UTF-8 locale, if you have one. 1989 1990 Y2K runtime checks are no longer enabled by default. Add 1991 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 1992 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 1993 to disable them. (New name suggested by Brian Inglis.) 1994 1995 The build procedure for zdump now works on AIX 7.1. 1996 (Problem reported by Kees Dekker.) 1997 1998 Changes to code 1999 2000 zic and the reference runtime now reject multiple leap seconds 2001 within 28 days of each other, or leap seconds before the Epoch. 2002 As a result, support for double leap seconds, which was 2003 obsolescent and undocumented, has been removed. Double leap 2004 seconds were an error in the C89 standard; they have never existed 2005 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 2006 noticing glitches in the code that uncovered this problem.) 2007 2008 zic now warns about use of the obsolescent and undocumented -y 2009 option, and about use of the obsolescent TYPE field of Rule lines. 2010 2011 zic now allows unambiguous abbreviations like "Sa" and "Su" for 2012 weekdays; formerly it rejected them due to a bug. Conversely, zic 2013 no longer considers non-prefixes to be abbreviations; for example, 2014 it no longer accepts "lF" as an abbreviation for "lastFriday". 2015 Also, zic warns about the undocumented usage with a "last-" 2016 prefix, e.g., "last-Fri". 2017 2018 Similarly, zic now accepts the unambiguous abbreviation "L" for 2019 "Link" in ordinary context and for "Leap" in leap-second context. 2020 Conversely, zic no longer accepts non-prefixes such as "La" as 2021 abbreviations for words like "Leap". 2022 2023 zic no longer accepts leap second lines in ordinary input, or 2024 ordinary lines in leap second input. Formerly, zic sometimes 2025 warned about this undocumented usage and handled it incorrectly. 2026 2027 The new macro HAVE_TZNAME governs whether the tzname external 2028 variable is exported, instead of USG_COMPAT. USG_COMPAT now 2029 governs only the external variables "timezone" and "daylight". 2030 This change is needed because the three variables are not in the 2031 same category: although POSIX requires tzname, it specifies the 2032 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 2033 if not defined, the code attempts to guess it from other macros. 2034 2035 localtime.c and difftime.c no longer require stdio.h, and .c files 2036 other than zic.c no longer require sys/wait.h. 2037 2038 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 2039 2040 Calculation of time_t extrema works around a bug in GCC 4.8.4 2041 (Reported by Stan Shebs and Joseph Myers.) 2042 2043 zic.c no longer mistranslates formats of line numbers in non-English 2044 locales. (Problem reported by Benno Schulenberg.) 2045 2046 Several minor changes have been made to the code to make it a 2047 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 2048 Dekker for reporting the problems.) 2049 2050 Changes to documentation and commentary 2051 2052 The two new files 'theory.html' and 'calendars' contain the 2053 contents of the removed file 'Theory'. The goal is to document 2054 tzdb theory more accessibly. 2055 2056 The zic man page now documents abbreviation rules. 2057 2058 tz-link.htm now covers how to apply tzdata changes to clients. 2059 (Thanks to Jorge Fbregas for the AIX link.) It also mentions MySQL. 2060 2061 The leap-seconds.list URL has been updated to something that is 2062 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 2063 2064 Release 2017b - 2017-03-17 07:30:38 -0700 2065 2066 Briefly: Haiti has resumed DST. 2067 2068 Changes to past and future timestamps 2069 2070 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 2071 2072 Changes to past timestamps 2073 2074 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 2075 2076 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 2077 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 2078 2079 Changes to code 2080 2081 The reference localtime implementation now falls back on the 2082 current US daylight-saving transition rules rather than the 2083 1987-2006 rules. This fallback occurs only when (1) the TZ 2084 environment variable has a value like "AST4ADT" that asks 2085 for daylight saving time but does not specify the rules, (2) there 2086 is no file by that name, and (3) the TZDEFRULES file cannot be 2087 loaded. (Thanks to Tom Lane.) 2088 2089 2090 Release 2017a - 2017-02-28 00:05:36 -0800 2091 2092 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 2093 discontinues DST. 2094 2095 Changes to future timestamps 2096 2097 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 2098 2099 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 2100 Its clocks diverge from America/Santiago starting 2017-05-13 at 2101 23:00, hiving off a new zone America/Punta_Arenas. Although the 2102 Chilean government says this change expires in May 2019, for now 2103 assume it's permanent. (Thanks to Juan Correa and Deborah 2104 Goldsmith.) This also affects Antarctica/Palmer. 2105 2106 Changes to past timestamps 2107 2108 Fix many entries for historical timestamps for Europe/Madrid 2109 before 1979, to agree with tables compiled by Pere Planesas of the 2110 National Astronomical Observatory of Spain. As a side effect, 2111 this changes some timestamps for Africa/Ceuta before 1929, which 2112 are probably guesswork anyway. (Thanks to Steve Allen and 2113 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 2114 correcting the 1901 transition.) 2115 2116 Ecuador observed DST from 1992-11-28 to 1993-02-05. 2117 (Thanks to Alois Treindl.) 2118 2119 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 2120 (Thanks to Stepan Golosunov.) 2121 2122 Changes to past and future time zone abbreviations 2123 2124 Switch to numeric time zone abbreviations for South America, as 2125 part of the ongoing project of removing invented abbreviations. 2126 This avoids the need to invent an abbreviation for the new Chilean 2127 new zone. Similarly, switch from invented to numeric time zone 2128 abbreviations for Afghanistan, American Samoa, the Azores, 2129 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 2130 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 2131 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 2132 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 2133 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 2134 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 2135 Papua New Guinea, the Philippines, Pitcairn, Qatar, Runion, St 2136 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 2137 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 2138 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 2139 for half-hour daylight saving time in Belize before 1944 and in 2140 the Dominican Republic before 1975; and for Canary Islands before 2141 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 2142 Indian Summer Time before 1942, for Indonesia before around 1964, 2143 for Kenya before 1960, for Liberia before 1973, for Madeira before 2144 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 2145 Pakistan before 1971, for Western Sahara before 1977, and for 2146 Zaporozhye in 1880-1924. 2147 2148 For Alaska time from 1900 through 1967, instead of "CAT" use the 2149 abbreviation "AST", the abbreviation commonly used at the time 2150 (Atlantic Standard Time had not been standardized yet). Use "AWT" 2151 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 2152 2153 Use "CST" and "CDT" instead of invented abbreviations for Macau 2154 before 1999 and Taiwan before 1938, and use "JST" instead of the 2155 invented abbreviation "JCST" for Japan and Korea before 1938. 2156 2157 Change to database entry category 2158 2159 Move the Pacific/Johnston link from 'australasia' to 'backward', 2160 since Johnston is now uninhabited. 2161 2162 Changes to code 2163 2164 zic no longer mishandles some transitions in January 2038 when it 2165 attempts to work around Qt bug 53071. This fixes a bug affecting 2166 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 2167 now contains a workaround, useful when loading a file generated by 2168 a buggy zic. (Problem and localtime.c fix reported by Bradley 2169 White.) 2170 2171 zdump -i now outputs non-hour numeric time zone abbreviations 2172 without a colon, e.g., "+0530" rather than "+05:30". This agrees 2173 with zic %z and with common practice, and simplifies auditing of 2174 zdump output. 2175 2176 zdump is now buildable again with -DUSE_LTZ=0. 2177 (Problem reported by Joseph Myers.) 2178 2179 zdump.c now always includes private.h, to avoid code duplication 2180 with private.h. (Problem reported by Kees Dekker.) 2181 2182 localtime.c no longer mishandles early or late timestamps 2183 when TZ is set to a POSIX-style string that specifies DST. 2184 (Problem reported by Kees Dekker.) 2185 2186 date and strftime now cause %z to generate "-0000" instead of 2187 "+0000" when the UT offset is zero and the time zone abbreviation 2188 begins with "-". 2189 2190 Changes to documentation and commentary 2191 2192 The 'Theory' file now better documents choice of historical time 2193 zone abbreviations. (Problems reported by Michael Deckers.) 2194 2195 tz-link.htm now covers leap smearing, which is popular in clouds. 2196 2197 2198 Release 2016j - 2016-11-22 23:17:13 -0800 2199 2200 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 2201 2202 Changes to future timestamps 2203 2204 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 2205 This hives off a new zone Europe/Saratov from Europe/Volgograd. 2206 (Thanks to Yuri Konotopov and Stepan Golosunov.) 2207 2208 Changes to past timestamps 2209 2210 The new zone Asia/Atyrau for Atyra Region, Kazakhstan, is like 2211 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 2212 1999, not fall 1994. (Thanks to Stepan Golosunov.) 2213 2214 Changes to past time zone abbreviations 2215 2216 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 2217 summer time before 1948. The old use of "EET" was a typo. 2218 2219 Changes to code 2220 2221 zic no longer mishandles file systems that lack hard links, fixing 2222 bugs introduced in 2016g. (Problems reported by Tom Lane.) 2223 Also, when the destination already contains symbolic links, zic 2224 should now work better on systems where the 'link' system call 2225 does not follow symbolic links. 2226 2227 Changes to documentation and commentary 2228 2229 tz-link.htm now documents the relationship between release version 2230 numbers and development-repository commit tags. (Suggested by 2231 Paul Koning.) 2232 2233 The 'Theory' file now documents UT. 2234 2235 iso3166.tab now accents "Curaao", and commentary now mentions 2236 the names "Cabo Verde" and "Czechia". (Thanks to Ji Boh.) 2237 2238 2239 Release 2016i - 2016-11-01 23:19:52 -0700 2240 2241 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 2242 reintroduces DST on 2016-11-06. 2243 2244 Changes to future timestamps 2245 2246 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 2247 2017-01-15 at 03:00. Assume future observances in Tonga will be 2248 from the first Sunday in November through the third Sunday in 2249 January, like Fiji. (Thanks to Pulu Anau.) Switch to numeric 2250 time zone abbreviations for this zone. 2251 2252 Changes to past and future timestamps 2253 2254 Northern Cyprus is now +03 year round, causing a split in Cyprus 2255 time zones starting 2016-10-30 at 04:00. This creates a zone 2256 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 2257 2258 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 2259 (Thanks to Steffen Thorsen.) 2260 2261 Changes to past timestamps 2262 2263 Several corrections were made for pre-1975 timestamps in Italy. 2264 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 2265 Europe/Vatican. 2266 2267 First, the 1893-11-01 00:00 transition in Italy used the new UT 2268 offset (+01), not the old (+00:49:56). (Thanks to Michael 2269 Deckers.) 2270 2271 Second, rules for daylight saving in Italy were changed to agree 2272 with Italy's National Institute of Metrological Research (INRiM) 2273 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 2274 Inglis, and Michael Deckers): 2275 2276 The 1916-06-03 transition was at 24:00, not 00:00. 2277 2278 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 2279 00:00, not 01:00. 2280 2281 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 2282 01:00. 2283 2284 The 1944-09-17 transition was at 03:00, not 01:00. This 2285 particular change is taken from Italian law as INRiM's table, 2286 (which says 02:00) appears to have a typo here. Also, keep the 2287 1944-04-03 transition for Europe/Rome, as Rome was controlled by 2288 Germany then. 2289 2290 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 2291 not 00:00. 2292 2293 Changes to code 2294 2295 The code should now be buildable on AmigaOS merely by setting the 2296 appropriate Makefile variables. (From a patch by Carsten Larsen.) 2297 2298 2299 Release 2016h - 2016-10-19 23:17:57 -0700 2300 2301 Changes to future timestamps 2302 2303 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 2304 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 2305 future fall transitions will be on the last Saturday of October 2306 at 01:00, which is consistent with predicted spring transitions 2307 on the last Saturday of March. (Thanks to Tim Parenti.) 2308 2309 Changes to past timestamps 2310 2311 In Turkey, transitions in 1986-1990 were at 01:00 standard time 2312 not at 02:00, and the spring 1994 transition was on March 20, not 2313 March 27. (Thanks to Kvan Yazan.) 2314 2315 Changes to past and future time zone abbreviations 2316 2317 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 2318 instead of alphabetic ones like "IST" and "LKT". Various 2319 English-language sources use "IST", "LKT" and "SLST", with no 2320 working consensus. (Usage of "SLST" mentioned by Sadika 2321 Sumanapala.) 2322 2323 Changes to code 2324 2325 zic no longer mishandles relativizing file names when creating 2326 symbolic links like /etc/localtime, when these symbolic links 2327 are outside the usual directory hierarchy. This fixes a bug 2328 introduced in 2016g. (Problem reported by Andreas Stieger.) 2329 2330 Changes to build procedure 2331 2332 New rules 'traditional_tarballs' and 'traditional_signatures' for 2333 building just the traditional-format distribution. (Requested by 2334 Deborah Goldsmith.) 2335 2336 The file 'version' is now put into the tzdata tarball too. 2337 (Requested by Howard Hinnant.) 2338 2339 Changes to documentation and commentary 2340 2341 The 'Theory' file now has a section on interface stability. 2342 (Requested by Paul Koning.) It also mentions features like 2343 tm_zone and localtime_rz that have long been supported by the 2344 reference code. 2345 2346 tz-link.htm has improved coverage of time zone boundaries suitable 2347 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 2348 Johnson.) 2349 2350 The US commentary now mentions Allen and the "day of two noons". 2351 2352 The Fiji commentary mentions the government's 2016-10-03 press 2353 release. (Thanks to Raymond Kumar.) 2354 2355 2356 Release 2016g - 2016-09-13 08:56:38 -0700 2357 2358 Changes to future timestamps 2359 2360 Turkey switched from EET/EEST (+02/+03) to permanent +03, 2361 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 2362 than an invented abbreviation for the new time. 2363 2364 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 2365 (Thanks to Tim Parenti.) 2366 2367 Changes to past timestamps 2368 2369 For America/Los_Angeles, spring-forward transition times have been 2370 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 2371 1950-1966. 2372 2373 For zones using Soviet time on 1919-07-01, transitions to UT-based 2374 time were at 00:00 UT, not at 02:00 local time. The affected 2375 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 2376 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 2377 2378 Changes to past and future time zone abbreviations 2379 2380 The Factory zone now uses the time zone abbreviation -00 instead 2381 of a long English-language string, as -00 is now the normal way to 2382 represent an undefined time zone. 2383 2384 Several zones in Antarctica and the former Soviet Union, along 2385 with zones intended for ships at sea that cannot use POSIX TZ 2386 strings, now use numeric time zone abbreviations instead of 2387 invented or obsolete alphanumeric abbreviations. The affected 2388 zones are Antarctica/Casey, Antarctica/Davis, 2389 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 2390 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 2391 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 2392 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 2393 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 2394 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 2395 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 2396 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 2397 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 2398 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 2399 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 2400 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 2401 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 2402 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 2403 was replaced by +05, whereas MSK and MSD were kept as they are not 2404 our invention and are widely used. 2405 2406 Changes to zone names 2407 2408 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 2409 (Thanks to David Massoud.) 2410 2411 Changes to code 2412 2413 zic no longer generates binary files containing POSIX TZ-like 2414 strings that disagree with the local time type after the last 2415 explicit transition in the data. This fixes a bug with 2416 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 2417 on the reference platform. (Thanks to Alexander Belopolsky for 2418 reporting the bug and suggesting a way forward.) 2419 2420 If the installed localtime and/or posixrules files are symbolic 2421 links, zic now keeps them symbolic links when updating them, for 2422 compatibility with platforms like OpenSUSE where other programs 2423 configure these files as symlinks. 2424 2425 zic now avoids hard linking to symbolic links, avoids some 2426 unnecessary mkdir and stat system calls, and uses shorter file 2427 names internally. 2428 2429 zdump has a new -i option to generate transitions in a 2430 smaller but still human-readable format. This option is 2431 experimental, and the output format may change in future versions. 2432 (Thanks to Jon Skeet for suggesting that an option was needed, 2433 and thanks to Tim Parenti and Chris Rovick for further comments.) 2434 2435 Changes to build procedure 2436 2437 An experimental distribution format is available, in addition 2438 to the traditional format which will continue to be distributed. 2439 The new format is a tarball tzdb-VERSION.tar.lz with signature 2440 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 2441 tzdb-VERSION containing the code and data of the traditional 2442 two-tarball format, along with extra data that may be useful. 2443 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 2444 for comments about the experimental format.) 2445 2446 The release version number is now more accurate in the usual case 2447 where releases are built from a Git repository. For example, if 2448 23 commits and some working-file changes have been made since 2449 release 2016g, the version number is now something like 2450 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 2451 Tagged releases use the same version number format as before, 2452 e.g., '2016g'. To support the more accurate version number, its 2453 specification has moved from a line in the Makefile to a new 2454 source file 'version'. 2455 2456 The experimental distribution contains a file to2050.tzs that 2457 contains what should be the output of 'zdump -i -c 2050' on 2458 primary zones. If this file is available, 'make check' now checks 2459 that zdump generates this output. 2460 2461 'make check_web' now works on Fedora-like distributions. 2462 2463 Changes to documentation and commentary 2464 2465 tzfile.5 now documents the new restriction on POSIX TZ-like 2466 strings that is now implemented by zic. 2467 2468 Comments now cite URLs for some 1917-1921 Russian DST decrees. 2469 (Thanks to Alexander Belopolsky.) 2470 2471 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 2472 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 2473 description of Java 8 has been brought up to date (thanks to 2474 Stephen Colebourne). Its description of local time on Mars has 2475 been updated to match current practice, and URLs have been updated 2476 and some obsolete ones removed. 2477 2478 2479 Release 2016f - 2016-07-05 16:26:51 +0200 2480 2481 Changes affecting future timestamps 2482 2483 The Egyptian government changed its mind on short notice, and 2484 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 2485 (Thanks to Mina Samuel.) 2486 2487 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 2488 (Thanks to Stepan Golosunov.) 2489 2490 Changes to past and future timestamps 2491 2492 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 2493 abbreviations instead of invented ones. 2494 2495 Changes affecting past timestamps 2496 2497 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 2498 (Thanks to Stepan Golosunov.) 2499 2500 2501 Release 2016e - 2016-06-14 08:46:16 -0700 2502 2503 Changes affecting future timestamps 2504 2505 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 2506 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 2507 For future years, guess April's last Thursday to October's last 2508 Thursday except for Ramadan. 2509 2510 Changes affecting past timestamps 2511 2512 Locations while uninhabited now use '-00', not 'zzz', as a 2513 placeholder time zone abbreviation. This is inspired by Internet 2514 RFC 3339 and is more consistent with numeric time zone 2515 abbreviations already used elsewhere. The change affects several 2516 arctic and antarctic locations, e.g., America/Cambridge_Bay before 2517 1920 and Antarctica/Troll before 2005. 2518 2519 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 2520 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 2521 2522 Changes to code 2523 2524 zic now outputs a dummy transition at time 2**31 - 1 in zones 2525 whose POSIX-style TZ strings contain a '<'. This mostly works 2526 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 2527 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 2528 2529 Changes affecting documentation and commentary 2530 2531 tz-link.htm says why governments should give plenty of notice for 2532 time zone or DST changes, and refers to Matt Johnson's blog post. 2533 2534 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 2535 2536 2537 Release 2016d - 2016-04-17 22:50:29 -0700 2538 2539 Changes affecting future timestamps 2540 2541 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 2542 (Thanks to Alexander Krivenyshev for the heads-up.) 2543 2544 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 2545 (Thanks to Alexander Krivenyshev and Matt Johnson.) 2546 2547 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 2548 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 2549 at 02:00. (Thanks to Stepan Golosunov.) 2550 2551 Changes affecting past timestamps 2552 2553 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 2554 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 2555 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 2556 the same change. (Thanks to Stepan Golosunov.) 2557 2558 Russia and nearby locations had daylight-saving transitions on 2559 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 2560 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 2561 Golosunov.) 2562 2563 Many corrections to historical time in Kazakhstan from 1991 2564 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 2565 invented time zone abbreviations with numeric abbreviations. 2566 2567 Changes to commentary 2568 2569 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 2570 2571 2572 Release 2016c - 2016-03-23 00:51:27 -0700 2573 2574 Changes affecting future timestamps 2575 2576 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 2577 2578 Chile reverts from permanent to seasonal DST. (Thanks to Juan 2579 Correa for the heads-up, and to Tim Parenti for corrections.) 2580 Guess that future transitions are August's and May's second 2581 Saturdays at 24:00 mainland time. Also, call the period from 2582 2014-09-07 through 2016-05-14 daylight saving time instead of 2583 standard time, as that seems more appropriate now. 2584 2585 Changes affecting past timestamps 2586 2587 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 2588 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 2589 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 2590 (Thanks to Stepan Golosunov.) 2591 2592 Changes to commentary 2593 2594 Several updates and URLs for historical and proposed Russian changes. 2595 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 2596 2597 2598 Release 2016b - 2016-03-12 17:30:14 -0800 2599 2600 Compatibility note 2601 2602 Starting with release 2016b, some data entries cause zic implementations 2603 derived from tz releases 2005j through 2015e to issue warnings like 2604 "time zone abbreviation differs from POSIX standard (+03)". 2605 These warnings should not otherwise affect zic's output and can safely be 2606 ignored on today's platforms, as the warnings refer to a restriction in 2607 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 2608 warnings is to upgrade to zic derived from tz releases 2015f and later. 2609 2610 Changes affecting future timestamps 2611 2612 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 2613 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 2614 2016-03-27 at 02:00 local time. They need distinct zones since their 2615 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 2616 Altai Republic, Russia, which will switch from +06 to +07 on the same date 2617 and local time. The Astrakhan change is already official; the others have 2618 passed the first reading in the State Duma and are extremely likely. 2619 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 2620 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 2621 and Stepan Golosunov for followup.) 2622 2623 As a trial of a new system that needs less information to be made up, 2624 the new zones use numeric time zone abbreviations like "+04" 2625 instead of invented abbreviations like "ASTT". 2626 2627 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 2628 Steffen Thorsen.) 2629 2630 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 2631 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 2632 Saturday at 01:00, not March's last Friday at 24:00. 2633 2634 Changes affecting past timestamps 2635 2636 Europe/Chisinau observed DST during 1990, and switched from +04 to 2637 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 2638 (Thanks to Stepan Golosunov.) 2639 2640 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 2641 KUYT/KUYST. (Thanks to Stepan Golosunov.) 2642 2643 Changes to code 2644 2645 tzselect's diagnostics and checking, and checktab.awk's checking, 2646 have been improved. (Thanks to J William Piggott.) 2647 2648 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 2649 2650 tzselect now tests Julian-date TZ settings more accurately. 2651 (Thanks to J William Piggott.) 2652 2653 Changes to commentary 2654 2655 Comments in zone tables have been improved. (Thanks to J William Piggott.) 2656 2657 tzselect again limits its menu comments so that menus fit on a 2658 2480 alphanumeric display. 2659 2660 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 2661 2662 In the Theory file, the description of possible time zone abbreviations in 2663 tzdata has been cleaned up, as the old description was unclear and 2664 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 2665 2666 2667 Release 2016a - 2016-01-26 23:28:02 -0800 2668 2669 Changes affecting future timestamps 2670 2671 America/Cayman will not observe daylight saving this year after all. 2672 Revert our guess that it would. (Thanks to Matt Johnson.) 2673 2674 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 2675 (Thanks to Alexander Krivenyshev.) 2676 2677 Asia/Tehran now has DST predictions for the year 2038 and later, 2678 to be March 21 00:00 to September 21 00:00. This is likely better 2679 than predicting no DST, albeit off by a day every now and then. 2680 2681 Changes affecting past and future timestamps 2682 2683 America/Metlakatla switched from PST all year to AKST/AKDT on 2684 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 2685 2686 America/Santa_Isabel has been removed, and replaced with a 2687 backward compatibility link to America/Tijuana. Its contents were 2688 apparently based on a misreading of Mexican legislation. 2689 2690 Changes affecting past timestamps 2691 2692 Asia/Karachi's two transition times in 2002 were off by a minute. 2693 (Thanks to Matt Johnson.) 2694 2695 Changes affecting build procedure 2696 2697 An installer can now combine leap seconds with use of the backzone file, 2698 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 2699 The old 'make posix_packrat' rule is now marked as obsolescent. 2700 (Thanks to Ian Abbott for an initial implementation.) 2701 2702 Changes affecting documentation and commentary 2703 2704 A new file LICENSE makes it easier to see that the code and data 2705 are mostly public-domain. (Thanks to James Knight.) The three 2706 non-public-domain files now use the current (3-clause) BSD license 2707 instead of older versions of that license. 2708 2709 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 2710 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 2711 on editing tz source files (with a mention of Sublime zoneinfo, 2712 thanks to Gilmore Davidson). 2713 2714 The Theory and asia files now mention the 2015 book "The Global 2715 Transformation of Time, 1870-1950", and cite a couple of reviews. 2716 2717 The America/Chicago entry now documents the informal use of US 2718 central time in Fort Pierre, South Dakota. (Thanks to Rick 2719 McDermid, Matt Johnson, and Steve Jones.) 2720 2721 2722 Release 2015g - 2015-10-01 00:39:51 -0700 2723 2724 Changes affecting future timestamps 2725 2726 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 2727 (Thanks to Fatih.) 2728 2729 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 2730 (Thanks to Alexander Krivenyshev.) 2731 2732 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 2733 (Thanks to Ken Rylander.) 2734 2735 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 2736 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 2737 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 2738 2739 Changes affecting past timestamps 2740 2741 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 2742 2743 Changes affecting code 2744 2745 localtime no longer mishandles America/Anchorage after 2037. 2746 (Thanks to Bradley White for reporting the bug.) 2747 2748 On hosts with signed 32-bit time_t, localtime no longer mishandles 2749 Pacific/Fiji after 2038-01-16 14:00 UTC. 2750 2751 The localtime module allows the variables 'timezone', 'daylight', 2752 and 'altzone' to be in common storage shared with other modules, 2753 and declares them in case the system <time.h> does not. 2754 (Problems reported by Kees Dekker.) 2755 2756 On platforms with tm_zone, strftime.c now assumes it is not NULL. 2757 This simplifies the code and is consistent with zdump.c. 2758 (Problem reported by Christos Zoulas.) 2759 2760 Changes affecting documentation 2761 2762 The tzfile man page now documents that transition times denote the 2763 starts (not the ends) of the corresponding time periods. 2764 (Ambiguity reported by Bill Seymour.) 2765 2766 2767 Release 2015f - 2015-08-10 18:06:56 -0700 2768 2769 Changes affecting future timestamps 2770 2771 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 2772 The abbreviation remains "KST". (Thanks to Robert Elz.) 2773 2774 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 2775 and Pablo Camargo.) 2776 2777 Changes affecting past and future timestamps 2778 2779 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 2780 (Thanks to Roman Tudos.) 2781 2782 Changes affecting data format and code 2783 2784 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 2785 field of a Rule line should now be '-'; the old values 'even', 2786 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 2787 Although the implementation has not changed, these features do not 2788 work in the default installation, they are not used in the data, 2789 and they are now considered obsolescent. 2790 2791 zic now checks that two rules don't take effect at the same time. 2792 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 2793 simultaneity are now documented. 2794 2795 The two characters '%z' in a zone format now stand for the UT 2796 offset, e.g., '-07' for seven hours behind UT and '+0530' for 2797 five hours and thirty minutes ahead. This better supports time 2798 zone abbreviations conforming to POSIX.1-2001 and later. 2799 2800 Changes affecting installed data files 2801 2802 Comments for America/Halifax and America/Glace_Bay have been improved. 2803 (Thanks to Brian Inglis.) 2804 2805 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 2806 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 2807 installed data files for Europe/Simferopol and Europe/Tallinn. 2808 It does not affect timestamps. (Thanks to Howard Hinnant.) 2809 2810 Changes affecting code 2811 2812 zdump and zic no longer warn about valid time zone abbreviations 2813 like '-05'. 2814 2815 Some Visual Studio 2013 warnings have been suppressed. 2816 (Thanks to Kees Dekker.) 2817 2818 'date' no longer sets the time of day and its -a, -d, -n and -t 2819 options have been removed. Long obsolescent, the implementation 2820 of these features had porting problems. Builders no longer need 2821 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 2822 (Thanks to Kees Dekker for pointing out the problem.) 2823 2824 Changes affecting documentation 2825 2826 The Theory file mentions naming issues earlier, as these seem to be 2827 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 2828 2829 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 2830 2831 Mention that Herbert Samuel introduced the term "Summer Time". 2832 2833 2834 Release 2015e - 2015-06-13 10:56:02 -0700 2835 2836 Changes affecting future timestamps 2837 2838 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 2839 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 2840 2841 Assume Cayman Islands will observe DST starting next year, using US rules. 2842 Although it isn't guaranteed, it is the most likely. 2843 2844 Changes affecting data format 2845 2846 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 2847 spell the names of land Islands, Cte d'Ivoire, and Runion. 2848 2849 Changes affecting code 2850 2851 When displaying data, tzselect converts it to the current locale's 2852 encoding if the iconv command works. (Problem reported by random832.) 2853 2854 tzselect no longer mishandles Dominica, fixing a bug introduced 2855 in Release 2014f. (Problem reported by Owen Leibman.) 2856 2857 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 2858 This fixes a bug introduced in Release 2014f. 2859 (Problem reported by Leonardo Chiquitto.) 2860 2861 2862 Release 2015d - 2015-04-24 08:09:46 -0700 2863 2864 Changes affecting future timestamps 2865 2866 Egypt will not observe DST in 2015 and will consider canceling it 2867 permanently. For now, assume no DST indefinitely. 2868 (Thanks to Ahmed Nazmy and Tim Parenti.) 2869 2870 Changes affecting past timestamps 2871 2872 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 2873 1966-07-01. Also, Yukon's time zone history is documented better. 2874 (Thanks to Brian Inglis and Dennis Ferguson.) 2875 2876 Change affecting past and future time zone abbreviations 2877 2878 The abbreviations for Hawaii-Aleutian standard and daylight times 2879 have been changed from HAST/HADT to HST/HDT, as per US Government 2880 Printing Office style. This affects only America/Adak since 1983, 2881 as America/Honolulu was already using the new style. 2882 2883 Changes affecting code 2884 2885 zic has some minor performance improvements. 2886 2887 2888 Release 2015c - 2015-04-11 08:55:55 -0700 2889 2890 Changes affecting future timestamps 2891 2892 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 2893 not 00:00 on April's last Friday. 2015's transition will therefore be on 2894 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 2895 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 2896 2897 Changes affecting past timestamps 2898 2899 The following changes affect some pre-1991 Chile-related timestamps 2900 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 2901 2902 The 1910 transition was January 10, not January 1. 2903 2904 The 1918 transition was September 10, not September 1. 2905 2906 The UT -04 time observed from 1932 to 1942 is now considered to 2907 be standard time, not year-round DST. 2908 2909 Santiago observed DST (UT -03) from 1946-07-15 through 2910 1946-08-31, then reverted to standard time, then switched to -05 2911 on 1947-04-01. 2912 2913 Assume transitions before 1968 were at 00:00, since we have no data 2914 saying otherwise. 2915 2916 The spring 1988 transition was 1988-10-09, not 1988-10-02. 2917 The fall 1990 transition was 1990-03-11, not 1990-03-18. 2918 2919 Assume no UT offset change for Pacific/Easter on 1890-01-01, 2920 and omit all transitions on Pacific/Easter from 1942 through 1946 2921 since we have no data suggesting that they existed. 2922 2923 One more zone has been turned into a link, as it differed 2924 from an existing zone only for older timestamps. As usual, 2925 this change affects UT offsets in pre-1970 timestamps only. 2926 The zone's old contents have been moved to the 'backzone' file. 2927 The affected zone is America/Montreal. 2928 2929 Changes affecting commentary 2930 2931 Mention the TZUpdater tool. 2932 2933 Mention "The Time Now". (Thanks to Brandon Ramsey.) 2934 2935 2936 Release 2015b - 2015-03-19 23:28:11 -0700 2937 2938 Changes affecting future timestamps 2939 2940 Mongolia will start observing DST again this year, from the last 2941 Saturday in March at 02:00 to the last Saturday in September at 00:00. 2942 (Thanks to Ganbold Tsagaankhuu.) 2943 2944 Palestine will start DST on March 28, not March 27. Also, 2945 correct the fall 2014 transition from September 26 to October 24. 2946 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 2947 2948 Changes affecting past timestamps 2949 2950 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 2951 regression. (Thanks to Stuart Bishop for reporting the problem.) 2952 2953 Some more zones have been turned into links, when they differed 2954 from existing zones only for older timestamps. As usual, 2955 these changes affect UT offsets in pre-1970 timestamps only. 2956 Their old contents have been moved to the 'backzone' file. 2957 The affected zones are: America/Antigua, America/Cayman, 2958 Pacific/Midway, and Pacific/Saipan. 2959 2960 Changes affecting time zone abbreviations 2961 2962 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 2963 (Thanks to Hank W.) 2964 2965 Changes affecting code 2966 2967 Fix integer overflow bug in reference 'mktime' implementation. 2968 (Problem reported by Jrg Richter.) 2969 2970 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 2971 to be used in the same executable as standard-library time_t functions. 2972 (Problems reported by Bradley White.) 2973 2974 Changes affecting commentary 2975 2976 Cite the recent Mexican decree changing Quintana Roo's time zone. 2977 (Thanks to Carlos Ral Perasso.) 2978 2979 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 2980 2981 Update info about Mars time. 2982 2983 2984 Release 2015a - 2015-01-29 22:35:20 -0800 2985 2986 Changes affecting future timestamps 2987 2988 The Mexican state of Quintana Roo, represented by America/Cancun, 2989 will shift from Central Time with DST to Eastern Time without DST 2990 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 2991 2992 Chile will not change clocks in April or thereafter; its new standard time 2993 will be its old daylight saving time. This affects America/Santiago, 2994 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 2995 2996 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 2997 (Thanks to Tim Parenti.) 2998 2999 Changes affecting past timestamps 3000 3001 Iceland observed DST in 1919 and 1921, and its 1939 fallback 3002 transition was Oct. 29, not Nov. 29. Remove incorrect data from 3003 Shanks about time in Iceland between 1837 and 1908. 3004 3005 Some more zones have been turned into links, when they differed 3006 from existing zones only for older timestamps. As usual, 3007 these changes affect UT offsets in pre-1970 timestamps only. 3008 Their old contents have been moved to the 'backzone' file. 3009 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 3010 and Asia/Muscat. 3011 3012 Changes affecting code 3013 3014 tzalloc now scrubs time zone abbreviations compatibly with the way 3015 that tzset always has, by replacing invalid bytes with '_' and by 3016 shortening too-long abbreviations. 3017 3018 tzselect ports to POSIX awk implementations, no longer mishandles 3019 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 3020 settings to the user. (Thanks to Stefan Kuhn.) 3021 3022 Changes affecting build procedure 3023 3024 'make check' now checks for links to links in the data. 3025 One such link (for Africa/Asmera) has been fixed. 3026 (Thanks to Stephen Colebourne for pointing out the problem.) 3027 3028 Changes affecting commentary 3029 3030 The leapseconds file commentary now mentions the expiration date. 3031 (Problem reported by Martin Burnicki.) 3032 3033 Update Mexican Library of Congress URL. 3034 3035 3036 Release 2014j - 2014-11-10 17:37:11 -0800 3037 3038 Changes affecting current and future timestamps 3039 3040 Turks & Caicos' switch from US eastern time to UT -04 year-round 3041 did not occur on 2014-11-02 at 02:00. It's currently scheduled 3042 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 3043 3044 Changes affecting past timestamps 3045 3046 Many pre-1989 timestamps have been corrected for Asia/Seoul and 3047 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 3048 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 3049 longer guess that Pyongyang mimicked Seoul time after World War II, 3050 as this is politically implausible. 3051 3052 Some more zones have been turned into links, when they differed 3053 from existing zones only for older timestamps. As usual, 3054 these changes affect UT offsets in pre-1970 timestamps only. 3055 Their old contents have been moved to the 'backzone' file. 3056 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 3057 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 3058 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 3059 Indian/Mayotte. 3060 3061 Changes affecting commentary 3062 3063 The commentary is less enthusiastic about Shanks as a source, 3064 and is more careful to distinguish UT from UTC. 3065 3066 3067 Release 2014i - 2014-10-21 22:04:57 -0700 3068 3069 Changes affecting future timestamps 3070 3071 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 3072 (Thanks to Ken Rylander for the heads-up.) Guess that future 3073 years will use a similar pattern. 3074 3075 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 3076 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 3077 (Thanks to Kiley Walbom for the heads-up.) 3078 3079 Changes affecting time zone abbreviations 3080 3081 Since Belarus is not changing its clocks even though Moscow is, 3082 the time zone abbreviation in Europe/Minsk is changing from FET 3083 to its more traditional value MSK on 2014-10-26 at 01:00. 3084 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 3085 3086 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 3087 Indochina, to distinguish it better from ICT (+07). 3088 3089 Changes affecting past timestamps 3090 3091 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 3092 (thanks to Trn Ngc Qun for an indirect pointer to Trn Tin Bnh's 3093 authoritative book). Asia/Ho_Chi_Minh has been added to 3094 zone1970.tab, to give tzselect users in Vietnam two choices, 3095 since north and south Vietnam disagreed after our 1970 cutoff. 3096 3097 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 3098 they differed from existing zones only for older timestamps. As 3099 usual, these changes affect pre-1970 timestamps only. Their old 3100 contents have been moved to the 'backzone' file. 3101 3102 Changes affecting code 3103 3104 The time-related library functions now set errno on failure, and 3105 some crashes in the new tzalloc-related library functions have 3106 been fixed. (Thanks to Christos Zoulas for reporting most of 3107 these problems and for suggesting fixes.) 3108 3109 If USG_COMPAT is defined and the requested timestamp is standard time, 3110 the tz library's localtime and mktime functions now set the extern 3111 variable timezone to a value appropriate for that timestamp; and 3112 similarly for ALTZONE, daylight saving time, and the altzone variable. 3113 This change is a companion to the tzname change in 2014h, and is 3114 designed to make timezone and altzone more compatible with tzname. 3115 3116 The tz library's functions now set errno to EOVERFLOW if they fail 3117 because the result cannot be represented. ctime and ctime_r now 3118 return NULL and set errno when a timestamp is out of range, rather 3119 than having undefined behavior. 3120 3121 Some bugs associated with the new 2014g functions have been fixed. 3122 This includes a bug that largely incapacitated the new functions 3123 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 3124 It also includes some uses of uninitialized variables after tzalloc. 3125 The new code uses the standard type 'ssize_t', which the Makefile 3126 now gives porting advice about. 3127 3128 Changes affecting commentary 3129 3130 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 3131 3132 3133 Release 2014h - 2014-09-25 18:59:03 -0700 3134 3135 Changes affecting past timestamps 3136 3137 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 3138 3139 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 3140 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 3141 3142 Some more zones have been turned into links, when they differed 3143 from existing zones only for older timestamps. As usual, 3144 these changes affect UT offsets in pre-1970 timestamps only. 3145 Their old contents have been moved to the 'backzone' file. 3146 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 3147 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 3148 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 3149 3150 Changes affecting code 3151 3152 zdump -V and -v now output gmtoff= values on all platforms, 3153 not merely on platforms defining TM_GMTOFF. 3154 3155 The tz library's localtime and mktime functions now set tzname to a value 3156 appropriate for the requested timestamp, and zdump now uses this 3157 on platforms not defining TM_ZONE, fixing a 2014g regression. 3158 (Thanks to Tim Parenti for reporting the problem.) 3159 3160 The tz library no longer sets tzname if localtime or mktime fails. 3161 3162 zdump -c no longer mishandles transitions near year boundaries. 3163 (Thanks to Tim Parenti for reporting the problem.) 3164 3165 An access to uninitialized data has been fixed. 3166 (Thanks to Jrg Richter for reporting the problem.) 3167 3168 When THREAD_SAFE is defined, the code ports to the C11 memory model. 3169 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 3170 and two threads race to initialize data used by gmtime-like functions. 3171 (Thanks to Andy Heninger for reporting the problems.) 3172 3173 Changes affecting build procedure 3174 3175 'make check' now checks better for properly sorted data. 3176 3177 Changes affecting documentation and commentary 3178 3179 zdump's gmtoff=N output is now documented, and its isdst=D output 3180 is now documented to possibly output D values other than 0 or 1. 3181 3182 zdump -c's treatment of years is now documented to use the 3183 Gregorian calendar and Universal Time without leap seconds, 3184 and its behavior at cutoff boundaries is now documented better. 3185 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 3186 3187 Programs are now documented to use the proleptic Gregorian calendar. 3188 (Thanks to Alan Barrett for the suggestion.) 3189 3190 Fractional-second GMT offsets have been documented for civil time 3191 in 19th-century Chennai, Jakarta, and New York. 3192 3193 3194 Release 2014g - 2014-08-28 12:31:23 -0700 3195 3196 Changes affecting future timestamps 3197 3198 Turks & Caicos is switching from US eastern time to UT -04 3199 year-round, modeled as a switch on 2014-11-02 at 02:00. 3200 [As noted in 2014j, this switch was later delayed.] 3201 3202 Changes affecting past timestamps 3203 3204 Time in Russia or the USSR before 1926 or so has been corrected by 3205 a few seconds in the following zones: Asia/Irkutsk, 3206 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 3207 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 3208 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 3209 Vladimir Karpinsky.) 3210 3211 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 3212 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 3213 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 3214 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 3215 (Thanks to Stephen Colebourne for pointing to the decree.) 3216 3217 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 3218 3219 A new file 'backzone' contains data which may appeal to 3220 connoisseurs of old timestamps, although it is out of scope for 3221 the tz database, is often poorly sourced, and contains some data 3222 that is known to be incorrect. The new file is not recommended 3223 for ordinary use and its entries are not installed by default. 3224 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 3225 Isle of Man entries.) 3226 3227 Some more zones have been turned into links, when they differed 3228 from existing zones only for older timestamps. As usual, 3229 these changes affect UT offsets in pre-1970 timestamps only. 3230 Their old contents have been moved to the 'backzone' file. 3231 The affected zones are: Africa/Bangui, Africa/Brazzaville, 3232 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 3233 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 3234 3235 Changes affecting code 3236 3237 Unless NETBSD_INSPIRED is defined to 0, the tz library now 3238 supplies functions for creating and using objects that represent 3239 timezones. The new functions are tzalloc, tzfree, localtime_rz, 3240 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 3241 time2posix_z. They are intended for performance: for example, 3242 localtime_rz (unlike localtime_r) is trivially thread-safe without 3243 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 3244 functions, and to Alan Barrett and Jonathan Lennox for helping to 3245 debug the change.) 3246 3247 zdump now builds with the tz library unless USE_LTZ is defined to 0, 3248 This lets zdump use tz features even if the system library lacks them. 3249 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 3250 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 3251 3252 zdump now uses localtime_rz if available, as it's significantly faster, 3253 and it can help zdump better diagnose invalid timezone names. 3254 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 3255 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 3256 not available, zdump now uses localtime_r and tzset if available, 3257 as this is a bit cleaner and faster than plain localtime. Compile 3258 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 3259 lacks these two functions. 3260 3261 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 3262 Although not needed for tz's own applications, which are single-threaded, 3263 this supports POSIX better if the tz library is used in multithreaded apps. 3264 3265 Some crashes have been fixed when zdump or the tz library is given 3266 invalid or outlandish input. 3267 3268 The tz library no longer mishandles leap seconds on platforms with 3269 unsigned time_t in timezones that lack ordinary transitions after 1970. 3270 3271 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 3272 already defined, to make it easier to configure on common platforms. 3273 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 3274 3275 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 3276 assumes that reading uninitialized memory yields garbage values 3277 but does not cause other problems such as traps. 3278 3279 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 3280 more likely to guess right for ambiguous timestamps near 3281 transitions where tm_isdst does not change. 3282 3283 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 3284 strftime_l for compatibility with recent versions of POSIX. 3285 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 3286 to 1 on recent POSIX versions, and to 0 otherwise. 3287 3288 tzselect -c now uses a hybrid distance measure that works better 3289 in Africa. (Thanks to Alan Barrett for noting the problem.) 3290 3291 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 3292 or when time_tz is defined. 3293 3294 When HAVE_UTMPX_H is set the 'date' command now builds on systems 3295 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 3296 the date it updates the wtmpx file if _PATH_WTMPX is defined. 3297 This affects GNU/Linux and similar systems. 3298 3299 For easier maintenance later, some C code has been simplified, 3300 some lint has been removed, and the code has been tweaked so that 3301 plain 'make' is more likely to work. 3302 3303 The C type 'bool' is now used for boolean values, instead of 'int'. 3304 3305 The long-obsolete LOCALE_HOME code has been removed. 3306 3307 The long-obsolete 'gtime' function has been removed. 3308 3309 Changes affecting build procedure 3310 3311 'zdump' no longer links in ialloc.o, as it's not needed. 3312 3313 'make check_time_t_alternatives' no longer assumes GNU diff. 3314 3315 Changes affecting distribution tarballs 3316 3317 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 3318 the tzdata tarball instead of the tzcode tarball, since they help 3319 maintain the data. The NEWS and Theory files are now also 3320 distributed in the tzdata tarball, as they're relevant for data. 3321 (Thanks to Alan Barrett for pointing this out.) Also, the 3322 leapseconds.awk file is no longer distributed in the tzcode 3323 tarball, since it belongs in the tzdata tarball (where 2014f 3324 inadvertently also distributed it). 3325 3326 Changes affecting documentation and commentary 3327 3328 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 3329 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 3330 for debugging it.) 3331 3332 The man pages have been updated to use function prototypes, 3333 to document thread-safe variants like localtime_r, and to document 3334 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 3335 mktime_z. 3336 3337 The fields in Link lines have been renamed to be more descriptive 3338 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 3339 and LINK-TO has become LINK-NAME. 3340 3341 tz-link.htm mentions the IETF's tzdist working group; Windows 3342 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 3343 3344 Some broken URLs have been fixed in the commentary. (Thanks to 3345 Lester Caine.) 3346 3347 Commentary about Philippines DST has been updated, and commentary 3348 on pre-1970 time in India has been added. 3349 3350 3351 Release 2014f - 2014-08-05 17:42:36 -0700 3352 3353 Changes affecting future timestamps 3354 3355 Russia will subtract an hour from most of its time zones on 2014-10-26 3356 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 3357 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 3358 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 3359 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 3360 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 3361 (Europe/Samara) are not changing their clocks. The changed zones are 3362 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 3363 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 3364 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 3365 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 3366 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 3367 but not its UTC offset. Two zones are added: Asia/Chita (split 3368 from Asia/Yakutsk, and also with two hours subtracted) and 3369 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 3370 subtracted). (Thanks to Tim Parenti for much of the above.) 3371 3372 Changes affecting time zone abbreviations 3373 3374 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 3375 and similarly for the other Australian zones. That is, for eastern 3376 standard and daylight saving time the abbreviations are AEST and AEDT 3377 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 3378 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 3379 This change does not affect UT offsets, only time zone abbreviations. 3380 (Thanks to Rich Tibbett and many others.) 3381 3382 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 3383 effective 2014-10-26 at 02:00 local time. 3384 3385 The time zone abbreviation for Xinjiang Time (observed in rmqi) 3386 has been changed from URUT to XJT. (Thanks to Luther Ma.) 3387 3388 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 3389 Similarly, prefer EET/EEST for eastern European time in Russia. 3390 3391 Change time zone abbreviations in (western) Samoa to use "ST" and 3392 "DT" suffixes, as this is more likely to match common practice. 3393 Prefix "W" to (western) Samoa time when its standard-time offset 3394 disagrees with that of American Samoa. 3395 3396 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 3397 3398 Time zone abbreviations have been updated for Japan's two time 3399 zones used 1896-1937. JWST now stands for Western Standard 3400 Time, and JCST for Central Standard Time (formerly this was CJT). 3401 These abbreviations are now used for time in Korea, Taiwan, 3402 and Sakhalin while controlled by Japan. 3403 3404 Changes affecting past timestamps 3405 3406 China's five zones have been simplified to two, since the post-1970 3407 differences in the other three seem to have been imaginary. The 3408 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 3409 removed; backwards-compatibility links still work, albeit with 3410 different behaviors for timestamps before May 1980. Asia/Urumqi's 3411 1980 transition to UT +08 has been removed, so that it is now at 3412 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 3413 Treindl sent helpful translations of two papers by Guo Qingsheng.) 3414 3415 Some zones have been turned into links, when they differed from existing 3416 zones only for older UT offsets where data entries were likely invented. 3417 These changes affect UT offsets in pre-1970 timestamps only. This is 3418 similar to the change in release 2013e, except this time for western 3419 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 3420 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 3421 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 3422 Atlantic/St_Helena. This also affects the backwards-compatibility 3423 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 3424 Tim Parenti, and David Patte for reporting problems in earlier 3425 versions of this change.) 3426 3427 Asia/Shanghai's pre-standard-time UT offset has been changed from 3428 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 3429 transition to standard time has been changed from 1928 to 1901. 3430 3431 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 3432 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 3433 In 1946 it observed DST from 05-15 through 09-30; in 1947 3434 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 3435 (Thanks to Yu-Cheng Chuang.) 3436 3437 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 3438 3439 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 3440 10-03 at 00:00. (Thanks to Konstantin Hyppnen.) 3441 3442 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 3443 period from 1911 to 1950. 3444 3445 Pacific/Chatham has been changed to New Zealand standard time plus 3446 45 minutes for the period before 1957, reflecting a 1956 remark in 3447 the New Zealand parliament. 3448 3449 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 3450 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 3451 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 3452 not 04-06 at 02:00; and there was no DST in 1920. 3453 3454 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 3455 3456 Time in Russia before 1927 or so has been corrected by a few seconds in 3457 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 3458 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 3459 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 3460 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 3461 3462 Changes affecting data format 3463 3464 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 3465 The new file's extended format allows multiple country codes per zone. 3466 The older file is still installed but is deprecated; its format is 3467 not changing and it will still be distributed for a while, but new 3468 applications should use the new file. 3469 3470 The new file format simplifies maintenance of obscure locations. 3471 To test this, it adds coverage for the Crozet Islands and the 3472 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 3473 3474 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 3475 It is still ASCII now, but commentary about the switch has been added. 3476 The new file 'zone1970.tab' already uses UTF-8. 3477 3478 Changes affecting code 3479 3480 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 3481 is defined. (Thanks to Elliott Hughes for reporting the problem.) 3482 3483 'zic' no longer mishandles input when ignoring case in locales that 3484 are not compatible with English, e.g., unibyte Turkish locales when 3485 compiled with HAVE_GETTEXT. 3486 3487 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 3488 they no longer use ASCII '-' as if it were a dash. 3489 3490 'zic' now rejects output file names that contain '.' or '..' components. 3491 (Thanks to Tim Parenti for reporting the problem.) 3492 3493 'zic -v' now warns about output file names that do not follow 3494 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 3495 David Olson for starting the ball rolling on this.) 3496 3497 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 3498 3499 Changes affecting build procedure 3500 3501 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 3502 (Thanks to John Cochran.) 3503 3504 Changes affecting documentation and commentary 3505 3506 The 'Theory' file documents legacy names, the longstanding 3507 exceptions to the POSIX-inspired file name rules. 3508 3509 The 'zic' documentation clarifies the role of time types when 3510 interpreting dates. (Thanks to Arthur David Olson.) 3511 3512 Documentation and commentary now prefer UTF-8 to US-ASCII, 3513 allowing the use of proper accents in foreign words and names. 3514 Code and data have not changed because of this. (Thanks to 3515 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 3516 this.) 3517 3518 Non-HTML documentation and commentary now use plain-text URLs instead of 3519 HTML insertions, and are more consistent about bracketing URLs when they 3520 are not already surrounded by white space. (Thanks to suggestions by 3521 Steffen Nurpmeso.) 3522 3523 There is new commentary about Xujiahui Observatory, the five time-zone 3524 project in China from 1918 to 1949, timekeeping in Japanese-occupied 3525 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 3526 warlord Jin Shuren in the data. 3527 3528 Commentary about the coverage of each Russian zone has been standardized. 3529 (Thanks to Tim Parenti.) 3530 3531 There is new commentary about contemporary timekeeping in Ethiopia. 3532 3533 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 3534 3535 There is new commentary about time in Poland in 1919. 3536 3537 Proper credit has been given to DST inventor George Vernon Hudson. 3538 3539 Commentary about time in Metlakatla, AK and Resolute, NU has been 3540 improved, with a new source for the former. 3541 3542 In zone.tab, Pacific/Easter no longer mentions Salas y Gmez, as it 3543 is uninhabited. 3544 3545 Commentary about permanent Antarctic bases has been updated. 3546 3547 Several typos have been corrected. (Thanks to Tim Parenti for 3548 contributing some of these fixes.) 3549 3550 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 3551 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 3552 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 3553 (Thanks to a heads-up from Dirkjan Ochtman.) 3554 3555 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 3556 have been removed. These obsolescent US Naval Observatory entries were no 3557 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 3558 3559 3560 Release 2014e - 2014-06-12 21:53:52 -0700 3561 3562 Changes affecting near-future timestamps 3563 3564 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 3565 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 3566 switch to standard time at 24:00 the last Thursday before Ramadan, and 3567 back to DST at 00:00 the first Friday after Ramadan. 3568 3569 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 3570 to Milamber Space Network.) Guess that from 2015 on Morocco will 3571 temporarily switch to standard time at 03:00 the last Saturday before 3572 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 3573 3574 Changes affecting past timestamps 3575 3576 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 3577 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 3578 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 3579 in 1991. (Thanks to Hank W. for reporting the problems.) 3580 3581 Changes affecting commentary 3582 3583 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 3584 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 3585 removes stale pointers to World Time Explorer and WORLDTIME. 3586 3587 3588 Release 2014d - 2014-05-27 21:34:40 -0700 3589 3590 Changes affecting code 3591 3592 zic no longer generates files containing timestamps before the Big Bang. 3593 This works around GNOME glib bug 878 3594 <https://gitlab.gnome.org/GNOME/glib/issues/878> 3595 (Thanks to Leonardo Chiquitto for reporting the bug, and to 3596 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 3597 3598 Changes affecting documentation 3599 3600 tz-link.htm now mentions GNOME. 3601 3602 3603 Release 2014c - 2014-05-13 07:44:13 -0700 3604 3605 Changes affecting near-future timestamps 3606 3607 Egypt observes DST starting 2014-05-15 at 24:00. 3608 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 3609 Details have not been announced, except that DST will not be observed 3610 during Ramadan. Guess that DST will stop during the same Ramadan dates as 3611 Morocco, and that Egypt's future spring and fall transitions will be the 3612 same as 2010 when it last observed DST, namely April's last Friday at 3613 00:00 to September's last Thursday at 23:00 standard time. Also, guess 3614 that Ramadan transitions will be at 00:00 standard time. 3615 3616 Changes affecting code 3617 3618 zic now generates transitions for minimum time values, eliminating guesswork 3619 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 3620 3621 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 3622 3623 Changes affecting commentary and documentation 3624 3625 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 3626 3627 3628 Release 2014b - 2014-03-24 21:28:50 -0700 3629 3630 Changes affecting near-future timestamps 3631 3632 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 3633 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 3634 3635 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 3636 Bengt-Inge Larsson.) This is currently an approximation; a better version 3637 will require the zic and localtime fixes mentioned below, and the plan is 3638 to wait for a while until at least the zic fixes propagate. 3639 3640 Changes affecting code 3641 3642 'zic' and 'localtime' no longer reject locations needing four transitions 3643 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 3644 Also, 'zic' avoids some unlikely failures due to integer overflow. 3645 3646 Changes affecting build procedure 3647 3648 'make check' now detects Rule lines defined but never used. 3649 The NZAQ rules, an instance of this problem, have been removed. 3650 3651 Changes affecting commentary and documentation 3652 3653 Fix Tuesday/Thursday typo in description of time in Israel. 3654 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 3655 3656 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 3657 to Donald MacQueen.) Instead, the Microsoft Windows Store app 3658 library supports them. 3659 3660 Add comments about Johnston Island time in the 1960s. 3661 (Thanks to Lyle McElhaney.) 3662 3663 Morocco's 2014 DST start will be as predicted. 3664 (Thanks to Sebastien Willemijns.) 3665 3666 3667 Release 2014a - 2014-03-07 23:30:29 -0800 3668 3669 Changes affecting near-future timestamps 3670 3671 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 3672 the heads-up, and to Tim Parenti for simplifying the update.) 3673 3674 Changes affecting past timestamps 3675 3676 Fiji ended DST on 2014-01-19 at 02:00, not the previously scheduled 03:00. 3677 (Thanks to Steffen Thorsen.) 3678 3679 Ukraine switched from Moscow to Eastern European time on 1990-07-01 3680 (not 1992-01-01), and observed DST during the entire next winter. 3681 (Thanks to Vladimir in Moscow via Alois Treindl.) 3682 3683 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 3684 (Thanks to Avigdor Finkelstein.) 3685 3686 Changes affecting code 3687 3688 A uninitialized-storage bug in 'localtime' has been fixed. 3689 (Thanks to Logan Chien.) 3690 3691 Changes affecting the build procedure 3692 3693 The settings for 'make check_web' now default to Ubuntu 13.10. 3694 3695 Changes affecting commentary and documentation 3696 3697 The boundary of the US Pacific time zone is given more accurately. 3698 (Thanks to Alan Mintz.) 3699 3700 Chile's 2014 DST will be as predicted. (Thanks to Jos Miguel Garrido.) 3701 3702 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Ral Perasso.) 3703 3704 Better descriptions of countries with same time zone history as 3705 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 3706 3707 Several changes affect tz-link.htm, the main web page. 3708 3709 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 3710 David Braverman). 3711 3712 Mention xCal (Internet RFC 6321) and jCal. 3713 3714 Microsoft has some support for tz database names. 3715 3716 CLDR data formats include both XML and JSON. 3717 3718 Mention Maggiolo's map of solar vs standard time. 3719 (Thanks to Arthur David Olson.) 3720 3721 Mention TZ4Net. (Thanks to Matt Johnson.) 3722 3723 Mention the timezone-olson Haskell package. 3724 3725 Mention zeitverschiebung.net. (Thanks to Martin Jger.) 3726 3727 Remove moribund links to daylight-savings-time.info and to 3728 Simple Timer + Clocks. 3729 3730 Update two links. (Thanks to Oscar van Vlijmen.) 3731 3732 Fix some formatting glitches, e.g., remove random newlines from 3733 abbr elements' title attributes. 3734 3735 3736 Release 2013i - 2013-12-17 07:25:23 -0800 3737 3738 Changes affecting near-future timestamps: 3739 3740 Jordan switches back to standard time at 00:00 on December 20, 2013. 3741 The 2006-2011 transition schedule is planned to resume in 2014. 3742 (Thanks to Steffen Thorsen.) 3743 3744 Changes affecting past timestamps: 3745 3746 In 2004, Cuba began DST on March 28, not April 4. 3747 (Thanks to Steffen Thorsen.) 3748 3749 Changes affecting code 3750 3751 The compile-time flag NOSOLAR has been removed, as nowadays the 3752 benefit of slightly shrinking runtime table size is outweighed by the 3753 cost of disallowing potential future updates that exceed old limits. 3754 3755 Changes affecting documentation and commentary 3756 3757 The files solar87, solar88, and solar89 are no longer distributed. 3758 They were a negative experiment - that is, a demonstration that 3759 tz data can represent solar time only with some difficulty and error. 3760 Their presence in the distribution caused confusion, as Riyadh 3761 civil time was generally not solar time in those years. 3762 3763 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 3764 3765 3766 Release 2013h - 2013-10-25 15:32:32 -0700 3767 3768 Changes affecting current and future timestamps: 3769 3770 Libya has switched its UT offset back to +02 without DST, instead 3771 of +01 with DST. (Thanks to Even Scharning.) 3772 3773 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 3774 (Thanks to Gwillim Law.) 3775 3776 Changes affecting future timestamps: 3777 3778 Acre and (we guess) western Amazonas will switch from UT -04 to -05 3779 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 3780 (Thanks to Steffen Thorsen.) 3781 3782 Add entries for DST transitions in Morocco in the year 2038. 3783 This avoids some year-2038 glitches introduced in 2013g. 3784 (Thanks to Yoshito Umaoka for reporting the problem.) 3785 3786 Changes affecting API 3787 3788 The 'tzselect' command no longer requires the 'select' command, 3789 and should now work with /bin/sh on more platforms. It also works 3790 around a bug in BusyBox awk before version 1.21.0. (Thanks to 3791 Patrick 'P. J.' McDermott and Alan Barrett.) 3792 3793 Changes affecting code 3794 3795 Fix localtime overflow bugs with 32-bit unsigned time_t. 3796 3797 zdump no longer assumes sscanf returns maximal values on overflow. 3798 3799 Changes affecting the build procedure 3800 3801 The builder can specify which programs to use, if any, instead of 3802 'ar' and 'ranlib', and libtz.a is now built locally before being 3803 installed. (Thanks to Michael Forney.) 3804 3805 A dependency typo in the 'zdump' rule has been fixed. 3806 (Thanks to Andrew Paprocki.) 3807 3808 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 3809 work as specified by POSIX.2-1992 or later; this is portable nowadays. 3810 3811 'make clean' no longer removes 'leapseconds', since it's 3812 host-independent and is part of the distribution. 3813 3814 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 3815 3816 Changes affecting documentation and commentary 3817 3818 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 3819 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 3820 3821 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 3822 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 3823 longer maintained) and for old advisories. SOFA now does C. 3824 3825 Release 2013g - 2013-09-30 21:08:26 -0700 3826 3827 Changes affecting current and near-future timestamps 3828 3829 Morocco now observes DST from the last Sunday in March to the last 3830 Sunday in October, not April to September respectively. (Thanks 3831 to Steffen Thorsen.) 3832 3833 Changes affecting 'zic' 3834 3835 'zic' now runs on platforms that lack both hard links and symlinks. 3836 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 3837 Also, fix some bugs on platforms that lack hard links but have symlinks. 3838 3839 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 3840 to predict the far future, fixing a bug introduced in 2013e. 3841 3842 Changes affecting the build procedure 3843 3844 The 'leapseconds' file is again put into the tzdata tarball. 3845 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 3846 Matt Burgess and Ian Abbott.) The timestamps of these and other 3847 dependent files in tarballs are adjusted more consistently. 3848 3849 Changes affecting documentation and commentary 3850 3851 The README file is now part of the data tarball as well as the code. 3852 It now states that files are public domain unless otherwise specified. 3853 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 3854 Its details about the 1989 release moved to a place of honor near 3855 the end of NEWS. 3856 3857 3858 Release 2013f - 2013-09-24 23:37:36 -0700 3859 3860 Changes affecting near-future timestamps 3861 3862 Tocantins will very likely not observe DST starting this spring. 3863 (Thanks to Steffen Thorsen.) 3864 3865 Jordan will likely stay at UT +03 indefinitely, and will not fall 3866 back this fall. 3867 3868 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 3869 3870 Changes affecting API 3871 3872 The types of the global variables 'timezone' and 'altzone' (if present) 3873 have been changed back to 'long'. This is required for 'timezone' 3874 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 3875 These variables were originally 'long' in the tz code, but were 3876 mistakenly changed to 'time_t' in 1987; nobody reported the 3877 incompatibility until now. The difference matters on x32, where 3878 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 3879 3880 Changes affecting the build procedure 3881 3882 Avoid long strings in leapseconds.awk to work around a mawk bug. 3883 (Thanks to Cyril Baurand.) 3884 3885 Changes affecting documentation and commentary 3886 3887 New file 'NEWS' that contains release notes like this one. 3888 3889 Paraguay's law does not specify DST transition time; 00:00 is customary. 3890 (Thanks to Waldemar Villamayor-Venialbo.) 3891 3892 Minor capitalization fixes. 3893 3894 Changes affecting version-control only 3895 3896 The experimental GitHub repository now contains annotated and 3897 signed tags for recent releases, e.g., '2013e' for Release 2013e. 3898 Releases are tagged starting with 2012e; earlier releases were 3899 done differently, and tags would either not have a simple name or 3900 not exactly match what was released. 3901 3902 'make set-timestamps' is now simpler and a bit more portable. 3903 3904 3905 Release 2013e - 2013-09-19 23:50:04 -0700 3906 3907 Changes affecting near-future timestamps 3908 3909 This year Fiji will start DST on October 27, not October 20. 3910 (Thanks to David Wheeler for the heads-up.) For now, guess that 3911 Fiji will continue to spring forward the Sunday before the fourth 3912 Monday in October. 3913 3914 Changes affecting current and future time zone abbreviations 3915 3916 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 3917 time zone abbreviations since 1932. (Thanks to George Ziegler, 3918 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 3919 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 3920 Asia/Makassar, and Asia/Pontianak. 3921 3922 Use ART (UT -03, standard time), rather than WARST (also -03, but 3923 daylight saving time) for San Luis, Argentina since 2009. 3924 3925 Changes affecting Godthb timestamps after 2037 if version mismatch 3926 3927 Allow POSIX-like TZ strings where the transition time's hour can 3928 range from -167 through 167, instead of the POSIX-required 0 3929 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 3930 new Fiji rules. This is a more compact way to represent 3931 far-future timestamps for America/Godthab, America/Santiago, 3932 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 3933 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 3934 this change. (Derived from a suggestion by Arthur David Olson.) 3935 3936 Allow POSIX-like TZ strings where daylight saving time is in 3937 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 3938 Argentina Summer Time all year. This supports a more compact way 3939 to represent the 2013d data for America/Argentina/San_Luis. 3940 Because of the change for San Luis noted above this change does not 3941 affect the current data. (Thanks to Andrew Main (Zefram) for 3942 suggestions that improved this change.) 3943 3944 Where these two TZ changes take effect, there is a minor extension 3945 to the tz file format in that it allows new values for the 3946 embedded TZ-format string, and the tz file format version number 3947 has therefore been increased from 2 to 3 as a precaution. 3948 Version-2-based client code should continue to work as before for 3949 all timestamps before 2038. Existing version-2-based client code 3950 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 3951 files, and typically works in practice even for timestamps after 3952 2037; the only known exception is America/Godthab. 3953 3954 Changes affecting timestamps before 1970 3955 3956 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 3957 some errors before 1947. 3958 3959 Some zones have been turned into links, when they differ from existing 3960 zones only in older data entries that were likely invented or that 3961 differ only in LMT or transitions from LMT. These changes affect 3962 only timestamps before 1943. The affected zones are: 3963 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 3964 America/Grenada, America/Guadeloupe, America/Marigot, 3965 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 3966 America/St_Lucia, America/St_Thomas, America/St_Vincent, 3967 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 3968 confirming that the old Europe/Vaduz zone was wrong and the new 3969 link is better for WWII-era times.) 3970 3971 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 3972 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 3973 from 1890 to 1912. 3974 3975 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 3976 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 3977 to Alois Treindl.) 3978 3979 Change the date of the circa-1850 Zurich transition from 1849-09-12 3980 to 1853-07-16, overriding Shanks with data from Messerli about 3981 postal and telegraph time in Switzerland. 3982 3983 Changes affecting time zone abbreviations before 1970 3984 3985 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 3986 as Jakarta was called Batavia back then. 3987 3988 Changes affecting API 3989 3990 The 'zic' command now outputs a dummy transition when far-future 3991 data can't be summarized using a TZ string, and uses a 402-year 3992 window rather than a 400-year window. For the current data, this 3993 affects only the Asia/Tehran file. It does not affect any of the 3994 timestamps that this file represents, so zdump outputs the same 3995 information as before. (Thanks to Andrew Main (Zefram).) 3996 3997 The 'date' command has a new '-r' option, which lets you specify 3998 the integer time to display, a la FreeBSD. 3999 4000 The 'tzselect' command has two new options '-c' and '-n', which lets you 4001 select a zone based on latitude and longitude. 4002 4003 The 'zic' command's '-v' option now warns about constructs that 4004 require the new version-3 binary file format. (Thanks to Arthur 4005 David Olson for the suggestion.) 4006 4007 Support for floating-point time_t has been removed. 4008 It was always dicey, and POSIX no longer requires it. 4009 (Thanks to Eric Blake for suggesting to the POSIX committee to 4010 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 4011 Heninger, Arthur David Olson, and Alois Treindl, for reporting 4012 bugs and elucidating some of the corners of the old floating-point 4013 implementation.) 4014 4015 The signatures of 'offtime', 'timeoff', and 'gtime' have been 4016 changed back to the old practice of using 'long' to represent UT 4017 offsets. This had been inadvertently and mistakenly changed to 4018 'int_fast32_t'. (Thanks to Christos Zoulas.) 4019 4020 The code avoids undefined behavior on integer overflow in some 4021 more places, including gmtime, localtime, mktime and zdump. 4022 4023 Changes affecting the zdump utility 4024 4025 zdump now outputs "UT" when referring to Universal Time, not "UTC". 4026 "UTC" does not make sense for timestamps that predate the introduction 4027 of UTC, whereas "UT", a more generic term, does. (Thanks to Steve Allen 4028 for clarifying UT vs UTC.) 4029 4030 Data changes affecting behavior of tzselect and similar programs 4031 4032 Country code BQ is now called the more common name "Caribbean Netherlands" 4033 rather than the more official "Bonaire, St Eustatius & Saba". 4034 4035 Remove from zone.tab the names America/Montreal, America/Shiprock, 4036 and Antarctica/South_Pole, as they are equivalent to existing 4037 same-country-code zones for post-1970 timestamps. The data entries for 4038 these names are unchanged, so the names continue to work as before. 4039 4040 Changes affecting code internals 4041 4042 zic -c now runs way faster on 64-bit hosts when given large numbers. 4043 4044 zic now uses vfprintf to avoid allocating and freeing some memory. 4045 4046 tzselect now computes the list of continents from the data, 4047 rather than have it hard-coded. 4048 4049 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 4050 4051 Changes affecting the build procedure 4052 4053 The 'leapseconds' file is now generated automatically from a 4054 new file 'leap-seconds.list', which is a copy of 4055 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 4056 A new source file 'leapseconds.awk' implements this. 4057 The goal is simplification of the future maintenance of 'leapseconds'. 4058 4059 When building the 'posix' or 'right' subdirectories, if the 4060 subdirectory would be a copy of the default subdirectory, it is 4061 now made a symbolic link if that is supported. This saves about 4062 2 MB of file system space. 4063 4064 The links America/Shiprock and Antarctica/South_Pole have been 4065 moved to the 'backward' file. This affects only nondefault builds 4066 that omit 'backward'. 4067 4068 Changes affecting version-control only 4069 4070 .gitignore now ignores 'date'. 4071 4072 Changes affecting documentation and commentary 4073 4074 Changes to the 'tzfile' man page 4075 4076 It now mentions that the binary file format may be extended in 4077 future versions by appending data. 4078 4079 It now refers to the 'zdump' and 'zic' man pages. 4080 4081 Changes to the 'zic' man page 4082 4083 It lists conditions that elicit a warning with '-v'. 4084 4085 It says that the behavior is unspecified when duplicate names 4086 are given, or if the source of one link is the target of another. 4087 4088 Its examples are updated to match the latest data. 4089 4090 The definition of white space has been clarified slightly. 4091 (Thanks to Michael Deckers.) 4092 4093 Changes to the 'Theory' file 4094 4095 There is a new section about the accuracy of the tz database, 4096 describing the many ways that errors can creep in, and 4097 explaining why so many of the pre-1970 timestamps are wrong or 4098 misleading (thanks to Steve Allen, Lester Caine, and Garrett 4099 Wollman for discussions that contributed to this). 4100 4101 The 'Theory' file describes LMT better (this follows a 4102 suggestion by Guy Harris). 4103 4104 It refers to the 2013 edition of POSIX rather than the 2004 edition. 4105 4106 It's mentioned that excluding 'backward' should not affect the 4107 other data, and it suggests at least one zone.tab name per 4108 inhabited country (thanks to Stephen Colebourne). 4109 4110 Some longstanding restrictions on names are documented, e.g., 4111 'America/New_York' precludes 'America/New_York/Bronx'. 4112 4113 It gives more reasons for the 1970 cutoff. 4114 4115 It now mentions which time_t variants are supported, such as 4116 signed integer time_t. (Thanks to Paul Goyette for reporting 4117 typos in an experimental version of this change.) 4118 4119 (Thanks to Philip Newton for correcting typos in these changes.) 4120 4121 Documentation and commentary is more careful to distinguish UT in 4122 general from UTC in particular. (Thanks to Steve Allen.) 4123 4124 Add a better source for the Zurich 1894 transition. 4125 (Thanks to Pierre-Yves Berger.) 4126 4127 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 4128 4129 4130 Release 2013d - 2013-07-05 07:38:01 -0700 4131 4132 Changes affecting future timestamps: 4133 4134 Morocco's midsummer transitions this year are July 7 and August 10, 4135 not July 9 and August 8. (Thanks to Andrew Paprocki.) 4136 4137 Israel now falls back on the last Sunday of October. 4138 (Thanks to Ephraim Silverberg.) 4139 4140 Changes affecting past timestamps: 4141 4142 Specify Jerusalem's location more precisely; this changes the pre-1880 4143 times by 2 s. 4144 4145 Changing affecting metadata only: 4146 4147 Fix typos in the entries for country codes BQ and SX. 4148 4149 Changes affecting code: 4150 4151 Rework the code to fix a bug with handling Australia/Macquarie on 4152 32-bit hosts (thanks to Arthur David Olson). 4153 4154 Port to platforms like NetBSD, where time_t can be wider than long. 4155 4156 Add support for testing time_t types other than the system's. 4157 Run 'make check_time_t_alternatives' to try this out. 4158 Currently, the tests fail for unsigned time_t; 4159 this should get fixed at some point. 4160 4161 Changes affecting documentation and commentary: 4162 4163 Deemphasize the significance of national borders. 4164 4165 Update the zdump man page. 4166 4167 Remove obsolete NOID comment (thanks to Denis Excoffier). 4168 4169 Update several URLs and comments in the web pages. 4170 4171 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 4172 4173 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 4174 4175 4176 Release 2013c - 2013-04-19 16:17:40 -0700 4177 4178 Changes affecting current and future timestamps: 4179 4180 Palestine observed DST starting March 29, 2013. (Thanks to 4181 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 4182 with the predicted rules being the last Thursday in March at 24:00 4183 to the first Friday on or after September 21 at 01:00. 4184 4185 Assume that the recent change to Paraguay's DST rules is permanent, 4186 by moving the end of DST to the 4th Sunday in March every year. 4187 (Thanks to Carlos Ral Perasso.) 4188 4189 Changes affecting past timestamps: 4190 4191 Fix some historical data for Palestine to agree with that of 4192 timeanddate.com, as follows: 4193 4194 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 4195 00:00 Apr 1. 4196 4197 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 4198 02:00. 4199 4200 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 4201 4202 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 4203 4204 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 4205 4206 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 4207 4208 Fix times of habitation for Macquarie to agree with the Tasmania 4209 Parks & Wildlife Service history, which indicates that permanent 4210 habitation was 1899-1919 and 1948 on. 4211 4212 Changing affecting metadata only: 4213 4214 Macquarie Island is politically part of Australia, not Antarctica. 4215 (Thanks to Tobias Conradi.) 4216 4217 Sort Macquarie more consistently with other parts of Australia. 4218 (Thanks to Tim Parenti.) 4219 4220 4221 Release 2013b - 2013-03-10 22:33:40 -0700 4222 4223 Changes affecting current and future timestamps: 4224 4225 Haiti uses US daylight-saving rules this year, and presumably future years. 4226 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 4227 4228 Paraguay will end DST on March 24 this year. 4229 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 4230 4231 Morocco does not observe DST during Ramadan; 4232 try to predict Ramadan in Morocco as best we can. 4233 (Thanks to Erik Homoet for the heads-up.) 4234 4235 Changes affecting commentary: 4236 4237 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 4238 Update URL for Solaris. Mention Internet RFC 6557. 4239 Update Internet RFCs 2445->5545, 2822->5322. 4240 Switch from FTP to HTTP for Internet RFCs. 4241 4242 4243 Release 2013a - 2013-02-27 09:20:35 -0800 4244 4245 Change affecting binary data format: 4246 4247 The zone offset at the end of version-2-format zone files is now 4248 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 4249 4250 Changes affecting current and future timestamps: 4251 4252 Chile's 2013 rules, and we guess rules for 2014 and later, will be 4253 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 4254 (Thanks to Steffen Thorsen and Robert Elz.) 4255 4256 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 4257 (Thanks to Tobias Conradi and Arthur David Olson.) 4258 4259 Many changes affect historical timestamps before 1940. 4260 These were deduced from: Milne J. Civil time. Geogr J. 1899 4261 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 4262 4263 Changes affecting the code: 4264 4265 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 4266 the data). (Thanks to Arthur David Olson.) 4267 4268 Fix localtime bug when time_t is unsigned and data files were generated 4269 by a signed time_t system. (Thanks to Doug Bailey for reporting and 4270 to Arthur David Olson for fixing.) 4271 4272 Allow the email address for bug reports to be set by the packager. 4273 The default is tz (a] iana.org, as before. (Thanks to Joseph S. Myers.) 4274 4275 Update HTML checking to be compatible with Ubuntu 12.10. 4276 4277 Check that files are a safe subset of ASCII. At some point we may 4278 relax this requirement to a safe subset of UTF-8. Without the 4279 check, some non-UTF-8 encodings were leaking into the distribution. 4280 4281 Commentary changes: 4282 4283 Restore a comment about copyright notices that was inadvertently deleted. 4284 (Thanks to Arthur David Olson.) 4285 4286 Improve the commentary about which districts observe what times 4287 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 4288 4289 Add web page links to tz.js. 4290 4291 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 4292 4293 4294 Release 2012j - 2012-11-12 18:34:49 -0800 4295 4296 Libya moved to CET this weekend, but with DST planned next year. 4297 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 4298 4299 Signatures now have the extension .asc, not .sign, as that's more 4300 standard. (Thanks to Phil Pennock.) 4301 4302 The output of 'zdump --version', and of 'zic --version', now 4303 uses a format that is more typical for --version. 4304 (Thanks to Joseph S. Myers.) 4305 4306 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 4307 now uses tz (a] iana.org rather than the old elsie address. 4308 4309 zic -v now complains about abbreviations that are less than 3 4310 or more than 6 characters, as per Posix. Formerly, it checked 4311 for abbreviations that were more than 3. 4312 4313 'make public' no longer puts its temporary directory under /tmp, 4314 and uses the just-built zic rather than the system zic. 4315 4316 Various fixes to documentation and commentary. 4317 4318 4319 Release 2012i - 2012-11-03 12:57:09 -0700 4320 4321 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 4322 4323 Linker flags can now be specified via LDFLAGS. 4324 AWK now defaults to 'awk', not 'nawk'. 4325 The shell in tzselect now defaults to /bin/bash, but this can 4326 be overridden by specifying KSHELL. 4327 The main web page now mentions the unofficial GitHub repository. 4328 (Thanks to Mike Frysinger.) 4329 4330 Tarball signatures can now be built by running 'make signatures'. 4331 There are also new makefile rules 'tarballs', 'check_public', and 4332 separate makefile rules for each tarball and signature file. 4333 A few makefile rules are now more portable to strict POSIX. 4334 4335 The main web page now lists the canonical IANA URL. 4336 4337 4338 Release 2012h - 2012-10-26 22:49:10 -0700 4339 4340 Bahia no longer has DST. (Thanks to Kelley Cook.) 4341 4342 Tocantins has DST. (Thanks to Rodrigo Severo.) 4343 4344 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 4345 4346 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 4347 4348 Web page updates. 4349 4350 More C modernization, except that at Arthur David Olson's suggestion 4351 the instances of 'register' were kept. 4352 4353 4354 Release 2012g - 2012-10-17 20:59:45 -0700 4355 4356 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 4357 4358 Palestine fall 2012. (Thanks to Steffen Thorsen.) 4359 4360 Assume C89. 4361 4362 To attack the version-number problem, this release ships the file 4363 'Makefile' (which contains the release number) in both the tzcode and 4364 the tzdata tarballs. The two Makefiles are identical, and should be 4365 identical in any matching pair of tarballs, so it shouldn't matter 4366 which order you extract the tarballs. Perhaps we can come up with a 4367 better version-number scheme at some point; this scheme does have the 4368 virtue of not adding more files. 4369 4370 4371 Release 2012f - 2012-09-12 23:17:03 -0700 4372 4373 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 4374 20 this year. (Thanks to Steffen Thorsen.) 4375 4376 4377 Release 2012e - 2012-08-02 20:44:55 -0700 4378 4379 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 4380 (Thanks to Steffen Thorsen.) 4381 4382 * Use a single version number for both code and data. 4383 4384 * .gitignore: New file. 4385 4386 * Remove trailing white space. 4387 4388 4389 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 4390 4391 Changes for Morocco's timestamps, which take effect in a couple of 4392 hours, along with infrastructure changes to accommodate how the tz 4393 code and data are released on IANA. 4394 4395 4396 Release data2012c - 2012-03-27 12:17:25 -0400 4397 4398 africa 4399 Summer time changes for Morocco (to start late April 2012) 4400 4401 asia 4402 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 4403 4404 northamerica 4405 Haiti following US/Canada rules for 2012 (and we're assuming, 4406 for now anyway, for the future). 4407 4408 4409 Release 2012b - 2012-03-02 12:29:15 +0700 4410 4411 There is just one change to tzcode2012b (compared with 2012a): 4412 the Makefile that was accidentally included with 2012a has been 4413 replaced with the version that should have been there, which is 4414 identical with the previous version (from tzcode2011i). 4415 4416 There are just two changes in tzdata2012b compared with 2012a. 4417 4418 Most significantly, summer time in Cuba has been delayed 3 weeks 4419 (now starts April 1 rather than March 11). Since Mar 11 (the old start 4420 date, as listed in 2012a) is just a little over a week away, this 4421 change is urgent. 4422 4423 Less importantly, an excess tab in one of the changes in zone.tab 4424 in 2012a has been removed. 4425 4426 4427 Release 2012a - 2012-03-01 18:28:10 +0700 4428 4429 The changes in tzcode2012a (compared to the previous version, 2011i) 4430 are entirely to the README and tz-art.htm and tz-link.htm files, if 4431 none of those concern you, you can ignore the code update. The changes 4432 reflect the changed addresses for the mailing list and the code and 4433 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 4434 has been added to tz-link.htm). 4435 4436 In tzdata2012a (compared to the previous release, which was 2011n) 4437 the major changes are: 4438 Chile 2011/2012 and 2012/2013 summer time date adjustments. 4439 Falkland Islands onto permanent summer time (we're assuming for the 4440 foreseeable future, though 2012 is all we're fairly certain of.) 4441 Armenia has abolished Summer Time. 4442 Tokelau jumped the International Date Line back last December 4443 (just the same as their near neighbour, Samoa). 4444 America/Creston is a new zone for a small area of British Columbia 4445 There will be a leapsecond 2012-06-30 23:59:60 UTC. 4446 4447 Other minor changes are: 4448 Corrections to 1918 Canadian summer time end dates. 4449 Updated URL for UK time zone history (in comments) 4450 A few typos in Le Corre's list of free French place names (comments) 4451 4452 4453 Release data2011n - 2011-10-30 14:57:54 +0700 4454 4455 There are three changes of note - most urgently, Cuba (America/Havana) 4456 has extended summer time by two weeks, now to end on Nov 13, rather than 4457 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 4458 (Europe/Tiraspol) decided not to split from the rest of Moldova after 4459 all, and consequently that zone has been removed (again) and reinstated 4460 in the "backward" file as a link to Europe/Chisinau. And third, the 4461 end date for Fiji's summer time this summer was moved forward from the 4462 earlier planned Feb 26, to Jan 22. 4463 4464 Apart from that, Moldova (MD) returns to a single entry in zone.tab 4465 (and the incorrect syntax that was in the 2011m version of that file 4466 is so fixed - it would have been fixed in a different way had this 4467 change not happened - that's the "missing" sccs version id). 4468 4469 4470 Release data2011m - 2011-10-24 21:42:16 +0700 4471 4472 In particular, the typos in comments in the data (2011-11-17 should have 4473 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 4474 Tim Parenti noted) have been fixed, and the change for Ukraine has been 4475 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to 4476 Tim Parenti, and also Denys Gavrysh) 4477 4478 In addition, I added Europe/Tiraspol to zone.tab. 4479 4480 This time, all the files have new version numbers... (including the files 4481 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 4482 version numbers there...) 4483 4484 4485 Release data2011l - 2011-10-10 11:15:43 +0700 4486 4487 There are just 2 changes that cause different generated tzdata files from 4488 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 4489 is included, but commented out. Compared with the diff I sent out last week, 4490 this version also includes attributions for the sources for the changes 4491 (in much the same format as ado used, but the html tags have not been 4492 checked, verified, or used in any way at all, so if there are errors there, 4493 please let me know.) 4494 4495 4496 Release data2011k - 2011-09-20 17:54:03 -0400 4497 4498 [not summarized] 4499 4500 4501 Release data2011j - 2011-09-12 09:22:49 -0400 4502 4503 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 4504 Tanzania); there are also two spelling corrections to comments in 4505 the australasia file (with thanks to Christos Zoulas). 4506 4507 4508 Release 2011i - 2011-08-29 05:56:32 -0400 4509 4510 [not summarized] 4511 4512 4513 Release data2011h - 2011-06-15 18:41:48 -0400 4514 4515 Russia and Curaao changes 4516 4517 4518 Release 2011g - 2011-04-25 09:07:22 -0400 4519 4520 update the rules for Egypt to reflect its abandonment of DST this year 4521 4522 4523 Release 2011f - 2011-04-06 17:14:53 -0400 4524 4525 [not summarized] 4526 4527 4528 Release 2011e - 2011-03-31 16:04:38 -0400 4529 4530 Morocco, Chile, and tz-link changes 4531 4532 4533 Release 2011d - 2011-03-14 09:18:01 -0400 4534 4535 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 4536 4537 4538 Release 2011c - 2011-03-07 09:30:09 -0500 4539 4540 These do affect current timestamps in Chile and Annette Island, Canada. 4541 4542 4543 Release 2011b - 2011-02-07 08:44:50 -0500 4544 4545 [not summarized] 4546 4547 4548 Release 2011a - 2011-01-24 10:30:16 -0500 4549 4550 [not summarized] 4551 4552 4553 Release data2010o - 2010-11-01 09:18:23 -0400 4554 4555 change to the end of DST in Fiji in 2011 4556 4557 4558 Release 2010n - 2010-10-25 08:19:17 -0400 4559 4560 [not summarized] 4561 4562 4563 Release 2010m - 2010-09-27 09:24:48 -0400 4564 4565 Hong Kong, Vostok, and zic.c changes 4566 4567 4568 Release 2010l - 2010-08-16 06:57:25 -0400 4569 4570 [not summarized] 4571 4572 4573 Release 2010k - 2010-07-26 10:42:27 -0400 4574 4575 [not summarized] 4576 4577 4578 Release 2010j - 2010-05-10 09:07:48 -0400 4579 4580 changes for Baha de Banderas and for version naming 4581 4582 4583 Release data2010i - 2010-04-16 18:50:45 -0400 4584 4585 the end of DST in Morocco on 2010-08-08 4586 4587 4588 Release data2010h - 2010-04-05 09:58:56 -0400 4589 4590 [not summarized] 4591 4592 4593 Release data2010g - 2010-03-24 11:14:53 -0400 4594 4595 [not summarized] 4596 4597 4598 Release 2010f - 2010-03-22 09:45:46 -0400 4599 4600 [not summarized] 4601 4602 4603 Release data2010e - 2010-03-08 14:24:27 -0500 4604 4605 corrects the Dhaka bug found by Danvin Ruangchan 4606 4607 4608 Release data2010d - 2010-03-06 07:26:01 -0500 4609 4610 [not summarized] 4611 4612 4613 Release 2010c - 2010-03-01 09:20:58 -0500 4614 4615 changes including KRE's suggestion for earlier initialization of 4616 "goahead" and "goback" structure elements 4617 4618 4619 Release code2010a - 2010-02-16 10:40:04 -0500 4620 4621 [not summarized] 4622 4623 4624 Release data2010b - 2010-01-20 12:37:01 -0500 4625 4626 Mexico changes 4627 4628 4629 Release data2010a - 2010-01-18 08:30:04 -0500 4630 4631 changes to Dhaka 4632 4633 4634 Release data2009u - 2009-12-26 08:32:28 -0500 4635 4636 changes to DST in Bangladesh 4637 4638 4639 Release 2009t - 2009-12-21 13:24:27 -0500 4640 4641 [not summarized] 4642 4643 4644 Release data2009s - 2009-11-14 10:26:32 -0500 4645 4646 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 4647 4648 4649 Release 2009r - 2009-11-09 10:10:31 -0500 4650 4651 "antarctica" and "tz-link.htm" changes 4652 4653 4654 Release 2009q - 2009-11-02 09:12:40 -0500 4655 4656 with two corrections as reported by Eric Muller and Philip Newton 4657 4658 4659 Release data2009p - 2009-10-23 15:05:27 -0400 4660 4661 Argentina (including San Luis) changes (with the correction from 4662 Mariano Absatz) 4663 4664 4665 Release data2009o - 2009-10-14 16:49:38 -0400 4666 4667 Samoa (commentary only), Pakistan, and Bangladesh changes 4668 4669 4670 Release data2009n - 2009-09-22 15:13:38 -0400 4671 4672 added commentary for Argentina and a change to the end of DST in 4673 2009 in Pakistan 4674 4675 4676 Release data2009m - 2009-09-03 10:23:43 -0400 4677 4678 Samoa and Palestine changes 4679 4680 4681 Release data2009l - 2009-08-14 09:13:07 -0400 4682 4683 Samoa (comments only) and Egypt 4684 4685 4686 Release 2009k - 2009-07-20 09:46:08 -0400 4687 4688 [not summarized] 4689 4690 4691 Release data2009j - 2009-06-15 06:43:59 -0400 4692 4693 Bangladesh change (with a short turnaround since the DST change is 4694 impending) 4695 4696 4697 Release 2009i - 2009-06-08 09:21:22 -0400 4698 4699 updating for DST in Bangladesh this year 4700 4701 4702 Release 2009h - 2009-05-26 09:19:14 -0400 4703 4704 [not summarized] 4705 4706 4707 Release data2009g - 2009-04-20 16:34:07 -0400 4708 4709 Cairo 4710 4711 4712 Release data2009f - 2009-04-10 11:00:52 -0400 4713 4714 correct DST in Pakistan 4715 4716 4717 Release 2009e - 2009-04-06 09:08:11 -0400 4718 4719 [not summarized] 4720 4721 4722 Release 2009d - 2009-03-23 09:38:12 -0400 4723 4724 Morocco, Tunisia, Argentina, and American Astronomical Society changes 4725 4726 4727 Release data2009c - 2009-03-16 09:47:51 -0400 4728 4729 change to the start of Cuban DST 4730 4731 4732 Release 2009b - 2009-02-09 11:15:22 -0500 4733 4734 [not summarized] 4735 4736 4737 Release 2009a - 2009-01-21 10:09:39 -0500 4738 4739 [not summarized] 4740 4741 4742 Release data2008i - 2008-10-21 12:10:25 -0400 4743 4744 southamerica and zone.tab files, with Argentina DST rule changes and 4745 United States zone reordering and recommenting 4746 4747 4748 Release 2008h - 2008-10-13 07:33:56 -0400 4749 4750 [not summarized] 4751 4752 4753 Release 2008g - 2008-10-06 09:03:18 -0400 4754 4755 Fix a broken HTML anchor and update Brazil's DST transitions; 4756 there's also a slight reordering of information in tz-art.htm. 4757 4758 4759 Release data2008f - 2008-09-09 22:33:26 -0400 4760 4761 [not summarized] 4762 4763 4764 Release 2008e - 2008-07-28 14:11:17 -0400 4765 4766 changes by Arthur David Olson and Jesper Nrgaard Welen 4767 4768 4769 Release data2008d - 2008-07-07 09:51:38 -0400 4770 4771 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 4772 4773 4774 Release data2008c - 2008-05-19 17:48:03 -0400 4775 4776 Pakistan, Morocco, and Mongolia 4777 4778 4779 Release data2008b - 2008-03-24 08:30:59 -0400 4780 4781 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 4782 link provided 4783 4784 4785 Release 2008a - 2008-03-08 05:42:16 -0500 4786 4787 [not summarized] 4788 4789 4790 Release 2007k - 2007-12-31 10:25:22 -0500 4791 4792 most importantly, changes to the "southamerica" file based on 4793 Argentina's readoption of daylight saving time 4794 4795 4796 Release 2007j - 2007-12-03 09:51:01 -0500 4797 4798 1. eliminate the "P" (parameter) macro; 4799 4800 2. the "noncontroversial" changes circulated on the time zone 4801 mailing list (less the changes to "logwtmp.c"); 4802 4803 3. eliminate "too many transition" errors when "min" is used in time 4804 zone rules; 4805 4806 4. changes by Paul Eggert (including updated information for Venezuela). 4807 4808 4809 Release data2007i - 2007-10-30 10:28:11 -0400 4810 4811 changes for Cuba and Syria 4812 4813 4814 Release 2007h - 2007-10-01 10:05:51 -0400 4815 4816 changes by Paul Eggert, as well as an updated link to the ICU 4817 project in tz-link.htm 4818 4819 4820 Release 2007g - 2007-08-20 10:47:59 -0400 4821 4822 changes by Paul Eggert 4823 4824 The "leapseconds" file has been updated to incorporate the most 4825 recent International Earth Rotation and Reference Systems Service 4826 (IERS) bulletin. 4827 4828 There's an addition to tz-art.htm regarding the television show "Medium". 4829 4830 4831 Release 2007f - 2007-05-07 10:46:46 -0400 4832 4833 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 4834 Zealand) 4835 4836 changes to zic.c to allow hour values greater than 24 (along with 4837 Paul's improved time value overflow checking) 4838 4839 4840 Release 2007e - 2007-04-02 10:11:52 -0400 4841 4842 Syria and Honduras changes by Paul Eggert 4843 4844 zic.c variable renaming changes by Arthur David Olson 4845 4846 4847 Release 2007d - 2007-03-20 08:48:30 -0400 4848 4849 changes by Paul Eggert 4850 4851 the elimination of white space at the ends of lines 4852 4853 4854 Release 2007c - 2007-02-26 09:09:37 -0500 4855 4856 changes by Paul Eggert 4857 4858 4859 Release 2007b - 2007-02-12 09:34:20 -0500 4860 4861 Paul Eggert's proposed change to the quotation handling logic in zic.c. 4862 4863 changes to the commentary in "leapseconds" reflecting the IERS 4864 announcement that there is to be no positive leap second at the end 4865 of June 2007. 4866 4867 4868 Release 2007a - 2007-01-08 12:28:29 -0500 4869 4870 changes by Paul Eggert 4871 4872 Derick Rethans's Asmara change 4873 4874 Oscar van Vlijmen's Easter Island local mean time change 4875 4876 symbolic link changes 4877 4878 4879 Release 2006p - 2006-11-27 08:54:27 -0500 4880 4881 changes by Paul Eggert 4882 4883 4884 Release 2006o - 2006-11-06 09:18:07 -0500 4885 4886 changes by Paul Eggert 4887 4888 4889 Release 2006n - 2006-10-10 11:32:06 -0400 4890 4891 changes by Paul Eggert 4892 4893 4894 Release 2006m - 2006-10-02 15:32:35 -0400 4895 4896 changes for Uruguay, Palestine, and Egypt by Paul Eggert 4897 4898 (minimalist) changes to zic.8 to clarify "until" information 4899 4900 4901 Release data2006l - 2006-09-18 12:58:11 -0400 4902 4903 Paul's best-effort work on this coming weekend's Egypt time change 4904 4905 4906 Release 2006k - 2006-08-28 12:19:09 -0400 4907 4908 changes by Paul Eggert 4909 4910 4911 Release 2006j - 2006-08-21 09:56:32 -0400 4912 4913 changes by Paul Eggert 4914 4915 4916 Release code2006i - 2006-08-07 12:30:55 -0400 4917 4918 localtime.c fixes 4919 4920 Ken Pizzini's conversion script 4921 4922 4923 Release code2006h - 2006-07-24 09:19:37 -0400 4924 4925 adds public domain notices to four files 4926 4927 includes a fix for transition times being off by a second 4928 4929 adds a new recording to the "arts" file (information courtesy Colin Bowern) 4930 4931 4932 Release 2006g - 2006-05-08 17:18:09 -0400 4933 4934 northamerica changes by Paul Eggert 4935 4936 4937 Release 2006f - 2006-05-01 11:46:00 -0400 4938 4939 a missing version number problem is fixed (with thanks to Bradley 4940 White for catching the problem) 4941 4942 4943 Release 2006d - 2006-04-17 14:33:43 -0400 4944 4945 changes by Paul Eggert 4946 4947 added new items to tz-arts.htm that were found by Paul 4948 4949 4950 Release 2006c - 2006-04-03 10:09:32 -0400 4951 4952 two sets of data changes by Paul Eggert 4953 4954 a fencepost error fix in zic.c 4955 4956 changes to zic.c and the "europe" file to minimize differences 4957 between output produced by the old 32-bit zic and the new 64-bit 4958 version 4959 4960 4961 Release 2006b - 2006-02-20 10:08:18 -0500 4962 [tz32code2006b + tz64code2006b + tzdata2006b] 4963 4964 64-bit code 4965 4966 All SCCS IDs were bumped to "8.1" for this release. 4967 4968 4969 Release 2006a - 2006-01-30 08:59:31 -0500 4970 4971 changes by Paul Eggert (in particular, Indiana time zone moves) 4972 4973 an addition to the zic manual page to describe how special-case 4974 transitions are handled 4975 4976 4977 Release 2005r - 2005-12-27 09:27:13 -0500 4978 4979 Canadian changes by Paul Eggert 4980 4981 They also add "<pre>" directives to time zone data files and reflect 4982 changes to warning message logic in "zdump.c" (but with calls to 4983 "gettext" kept unbundled at the suggestion of Ken Pizzini). 4984 4985 4986 Release 2005q - 2005-12-13 09:17:09 -0500 4987 4988 Nothing earth-shaking here: 4989 1. Electronic mail addresses have been removed. 4990 2. Casts of the return value of exit have been removed. 4991 3. Casts of the argument of is.* macros have been added. 4992 4. Indentation in one section of zic.c has been fixed. 4993 5. References to dead URLs in the data files have been dealt with. 4994 4995 4996 Release 2005p - 2005-12-05 10:30:53 -0500 4997 4998 "systemv", "tz-link.htm", and "zdump.c" changes 4999 (less the casts of arguments to the is* macros) 5000 5001 5002 Release 2005o - 2005-11-28 10:55:26 -0500 5003 5004 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 5005 5006 zdump.c lint fixes by Arthur David Olson 5007 5008 5009 Release 2005n - 2005-10-03 09:44:09 -0400 5010 5011 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 5012 et al. changes) 5013 5014 5015 Release 2005m - 2005-08-29 12:15:40 -0400 5016 5017 changes by Paul Eggert (with a small tweak to the tz-art change) 5018 5019 a declaration of an unused variable has been removed from zdump.c 5020 5021 5022 Release 2005l - 2005-08-22 12:06:39 -0400 5023 5024 changes by Paul Eggert 5025 5026 overflow/underflow checks by Arthur David Olson, minus changes to 5027 the "Theory" file about the pending addition of 64-bit data (I grow 5028 less confident of the changes being accepted with each passing day, 5029 and the changes no longer increase the data files nine-fold--there's 5030 less than a doubling in size by my local Sun's reckoning) 5031 5032 5033 Release 2005k - 2005-07-14 14:14:24 -0400 5034 5035 The "leapseconds" file has been edited to reflect the recently 5036 announced leap second at the end of 2005. 5037 5038 I've also deleted electronic mail addresses from the files as an 5039 anti-spam measure. 5040 5041 5042 Release 2005j - 2005-06-13 14:34:13 -0400 5043 5044 These reflect changes to limit the length of time zone abbreviations 5045 and the characters used in those abbreviations. 5046 5047 There are also changes to handle POSIX-style "quoted" timezone 5048 environment variables. 5049 5050 The changes were circulated on the time zone mailing list; the only 5051 change since then was the removal of a couple of minimum-length of 5052 abbreviation checks. 5053 5054 5055 Release data2005i - 2005-04-21 15:04:16 -0400 5056 5057 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 5058 5059 5060 Release 2005h - 2005-04-04 11:24:47 -0400 5061 5062 changes by Paul Eggert 5063 5064 minor changes to Makefile and zdump.c to produce more useful output 5065 when doing a "make typecheck" 5066 5067 5068 Release 2005g - 2005-03-14 10:11:21 -0500 5069 5070 changes by Paul Eggert (a change to current DST rules in Uruguay and 5071 an update to a link to time zone software) 5072 5073 5074 Release 2005f - 2005-03-01 08:45:32 -0500 5075 5076 data and documentation changes by Paul Eggert 5077 5078 5079 Release 2005e - 2005-02-10 15:59:44 -0500 5080 5081 [not summarized] 5082 5083 5084 Release code2005d - 2005-01-31 09:21:47 -0500 5085 5086 make zic complain about links to links if the -v flag is used 5087 5088 have "make public" do more code checking 5089 5090 add an include to "localtime.c" for the benefit of gcc systems 5091 5092 5093 Release 2005c - 2005-01-17 18:36:29 -0500 5094 5095 get better results when mktime runs on a system where time_t is double 5096 5097 changes to the data files (most importantly to Paraguay) 5098 5099 5100 Release 2005b - 2005-01-10 09:19:54 -0500 5101 5102 Get localtime and gmtime working on systems with exotic time_t types. 5103 5104 Update the leap second commentary in the "leapseconds" file. 5105 5106 5107 Release 2005a - 2005-01-01 13:13:44 -0500 5108 5109 [not summarized] 5110 5111 5112 Release code2004i - 2004-12-14 13:42:58 -0500 5113 5114 Deal with systems where time_t is unsigned. 5115 5116 5117 Release code2004h - 2004-12-07 11:40:18 -0500 5118 5119 64-bit-time_t changes 5120 5121 5122 Release 2004g - 2004-11-02 09:06:01 -0500 5123 5124 update to Cuba (taking effect this weekend) 5125 5126 other changes by Paul Eggert 5127 5128 correction of the spelling of Oslo 5129 5130 changed versions of difftime.c and private.h 5131 5132 5133 Release code2004f - 2004-10-21 10:25:22 -0400 5134 5135 Cope with wide-ranging tm_year values. 5136 5137 5138 Release 2004e - 2004-10-11 14:47:21 -0400 5139 5140 Brazil/Argentina/Israel changes by Paul Eggert 5141 5142 changes to tz-link.htm by Paul 5143 5144 one small fix to Makefile 5145 5146 5147 Release 2004d - 2004-09-22 08:27:29 -0400 5148 5149 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 5150 5151 5152 Release 2004c - 2004-08-11 12:06:26 -0400 5153 5154 asctime-related changes 5155 5156 (variants of) some of the documentation changes suggested by Paul Eggert 5157 5158 5159 Release 2004b - 2004-07-19 14:33:35 -0400 5160 5161 data changes by Paul Eggert - most importantly, updates for Argentina 5162 5163 5164 Release 2004a - 2004-05-27 12:00:47 -0400 5165 5166 changes by Paul Eggert 5167 5168 Handle DST transitions that occur at the end of a month in some 5169 years but at the start of the following month in other years. 5170 5171 Add a copy of the correspondence that's the basis for claims about 5172 DST in the Navajo Nation. 5173 5174 5175 Release 2003e - 2003-12-15 09:36:47 -0500 5176 5177 changes by Arthur David Olson (primarily code changes) 5178 5179 changes by Paul Eggert (primarily data changes) 5180 5181 minor changes to "Makefile" and "northamerica" (in the latter case, 5182 optimization of the "Toronto" rules) 5183 5184 5185 Release 2003d - 2003-10-06 09:34:44 -0400 5186 5187 changes by Paul Eggert 5188 5189 5190 Release 2003c - 2003-09-16 10:47:05 -0400 5191 5192 Fix bad returns in zic.c's inleap function. 5193 Thanks to Bradley White for catching the problem! 5194 5195 5196 Release 2003b - 2003-09-16 07:13:44 -0400 5197 5198 Add a "--version" option (and documentation) to the zic and zdump commands. 5199 5200 changes to overflow/underflow checking in zic 5201 5202 a localtime typo fix. 5203 5204 Update the leapseconds and tz-art.htm files. 5205 5206 5207 Release 2003a - 2003-03-24 09:30:54 -0500 5208 5209 changes by Paul Eggert 5210 5211 a few additions and modifications to the tz-art.htm file 5212 5213 5214 Release 2002d - 2002-10-15 13:12:42 -0400 5215 5216 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 5217 5218 There's also a new time zone quote in "tz-art.htm". 5219 5220 5221 Release 2002c - 2002-04-04 11:55:20 -0500 5222 5223 changes by Paul Eggert 5224 5225 Change zic.c to avoid creating symlinks to files that don't exist. 5226 5227 5228 Release 2002b - 2002-01-28 12:56:03 -0500 5229 5230 [These change notes are for Release 2002a, which was corrupted. 5231 2002b was a corrected version of 2002a.] 5232 5233 changes by Paul Eggert 5234 5235 Update the "leapseconds" file to note that there'll be no leap 5236 second at the end of June, 2002. 5237 5238 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 5239 5240 Change to "difftime.c" to avoid sizeof problems. 5241 5242 5243 Release 2001d - 2001-10-09 13:31:32 -0400 5244 5245 changes by Paul Eggert 5246 5247 5248 Release 2001c - 2001-06-05 13:59:55 -0400 5249 5250 changes by Paul Eggert and Andrew Brown 5251 5252 5253 Release 2001b - 2001-04-05 16:44:38 -0400 5254 5255 changes by Paul Eggert (modulo jnorgard's typo fix) 5256 5257 tz-art.htm has been HTMLified. 5258 5259 5260 Release 2001a - 2001-03-13 12:57:44 -0500 5261 5262 changes by Paul Eggert 5263 5264 An addition to the "leapseconds" file: comments with the text of the 5265 latest IERS leap second notice. 5266 5267 Trailing white space has been removed from data file lines, and 5268 repeated spaces in "Rule Jordan" lines in the "asia" file have been 5269 converted to tabs. 5270 5271 5272 Release 2000h - 2000-12-14 15:33:38 -0500 5273 5274 changes by Paul Eggert 5275 5276 one typo fix in the "art" file 5277 5278 With providence, this is the last update of the millennium. 5279 5280 5281 Release 2000g - 2000-10-10 11:35:22 -0400 5282 5283 changes by Paul Eggert 5284 5285 correction of John Mackin's name submitted by Robert Elz 5286 5287 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 5288 Emmy Awards broadcast. 5289 5290 5291 Release 2000f - 2000-08-10 09:31:58 -0400 5292 5293 changes by Paul Eggert 5294 5295 Added information in "tz-art.htm" on a Seinfeld reference to DST. 5296 5297 Error checking and messages in the "yearistype" script have been 5298 improved. 5299 5300 5301 Release 2000e - 2000-07-31 09:27:54 -0400 5302 5303 data changes by Paul Eggert 5304 5305 a change to the default value of the defined constant HAVE_STRERROR 5306 5307 the addition of a Dave Barry quote on DST to the tz-arts file 5308 5309 5310 Release 2000d - 2000-04-20 15:43:04 -0400 5311 5312 changes to the documentation and code of strftime for C99 conformance 5313 5314 a bug fix for date.c 5315 5316 These are based on (though modified from) changes by Paul Eggert. 5317 5318 5319 Release 2000c - 2000-03-04 10:31:43 -0500 5320 5321 changes by Paul Eggert 5322 5323 5324 Release 2000b - 2000-02-21 12:16:29 -0500 5325 5326 changes by Paul Eggert and Joseph Myers 5327 5328 modest tweaks to the tz-art.htm and tz-link.htm files 5329 5330 5331 Release 2000a - 2000-01-18 09:21:26 -0500 5332 5333 changes by Paul Eggert 5334 5335 The two hypertext documents have also been renamed. 5336 5337 5338 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 5339 5340 Paul Eggert's changes 5341 5342 additions to the "zic" manual page and the "Arts.htm" file 5343 5344 5345 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 5346 5347 [not summarized] 5348 5349 5350 Release data1999h - 1999-10-07 03:50:29 -0400 5351 5352 changes by Paul Eggert to "europe" (most importantly, fixing 5353 Lithuania and Estonia) 5354 5355 5356 Release 1999g - 1999-09-28 11:06:18 -0400 5357 5358 data changes by Paul Eggert (most importantly, the change for 5359 Lebanon that buys correctness for this coming Sunday) 5360 5361 The "code" file contains changes to "Makefile" and "checktab.awk" to 5362 allow better checking of time zone files before they are published. 5363 5364 5365 Release 1999f - 1999-09-23 09:48:14 -0400 5366 5367 changes by Arthur David Olson and Paul Eggert 5368 5369 5370 Release 1999e - 1999-08-17 15:20:54 -0400 5371 5372 changes circulated by Paul Eggert, although the change to handling 5373 of DST-specifying timezone names has been commented out for now 5374 (search for "XXX" in "localtime.c" for details). These files also 5375 do not make any changes to the start of DST in Brazil. 5376 5377 In addition to Paul's changes, there are updates to "Arts.htm" and 5378 cleanups of URLs. 5379 5380 5381 Release 1999d - 1999-03-30 11:31:07 -0500 5382 5383 changes by Paul Eggert 5384 5385 The Makefile's "make public" rule has also been changed to do a test 5386 compile of each individual time zone data file (which should help 5387 avoid problems such as the one we had with Nicosia). 5388 5389 5390 Release 1999c - 1999-03-25 09:47:47 -0500 5391 5392 changes by Paul Eggert, most importantly the change for Chile. 5393 5394 5395 Release 1999b - 1999-02-01 17:51:44 -0500 5396 5397 changes by Paul Eggert 5398 5399 code changes (suggested by Mani Varadarajan, mani at be.com) for 5400 correct handling of symbolic links when building using a relative directory 5401 5402 code changes to generate correct messages for failed links 5403 5404 updates to the URLs in Arts.htm 5405 5406 5407 Release 1999a - 1999-01-19 16:20:29 -0500 5408 5409 error message internationalizations and corrections in zic.c and 5410 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 5411 to whom thanks!) 5412 5413 5414 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 5415 5416 changes for Brazil, Chile, and Germany 5417 5418 support for use of "24:00" in the input files for the time zone compiler 5419 5420 5421 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 5422 5423 changes by Paul Eggert 5424 5425 correction to a define in the "private.h" file 5426 5427 5428 Release data1998g - 1998-08-11 03:28:35 -0000 5429 [tzdata1998g.tar.gz is missing!] 5430 5431 Lithuanian change provided by mgedmin at pub.osf.it 5432 5433 Move creation of the GMT link with Etc/GMT to "etcetera" (from 5434 "backward") to ensure that the GMT file is created even where folks 5435 don't want the "backward" links (as suggested by Paul Eggert). 5436 5437 5438 Release data1998f - 1998-07-20 13:50:00 -0000 5439 [tzdata1998f.tar.gz is missing!] 5440 5441 Update the "leapseconds" file to include the newly announced 5442 insertion at the end of 1998. 5443 5444 5445 Release code1998f - 1998-06-01 10:18:31 -0400 5446 5447 addition to localtime.c by Guy Harris 5448 5449 5450 Release 1998e - 1998-05-28 09:56:26 -0400 5451 5452 The Makefile is changed to produce zoneinfo-posix rather than 5453 zoneinfo/posix, and to produce zoneinfo-leaps rather than 5454 zoneinfo/right. 5455 5456 data changes by Paul Eggert 5457 5458 changes from Guy Harris to provide asctime_r and ctime_r 5459 5460 A usno1998 file (substantially identical to usno1997) has been added. 5461 5462 5463 Release 1998d - 1998-05-14 11:58:34 -0400 5464 5465 changes to comments (in particular, elimination of references to CIA maps). 5466 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 5467 where changes occur. 5468 5469 5470 Release 1998c - 1998-02-28 12:32:26 -0500 5471 5472 changes by Paul Eggert (save the "French correction," on which I'll 5473 wait for the dust to settle) 5474 5475 symlink changes 5476 5477 changes and additions to Arts.htm 5478 5479 5480 Release 1998b - 1998-01-17 14:31:51 -0500 5481 5482 URL cleanups and additions 5483 5484 5485 Release 1998a - 1998-01-13 12:37:35 -0500 5486 5487 changes by Paul Eggert 5488 5489 5490 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 5491 5492 changes by Paul Eggert, with minor modifications from Arthur David 5493 Olson to make the files more browser friendly 5494 5495 5496 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 5497 5498 minor changes to put "TZif" at the start of each timezone information file 5499 5500 a rule has also been added to the Makefile so you can 5501 make zones 5502 to just recompile the zone information files (rather than doing a 5503 full "make install" with its other effects). 5504 5505 5506 Release data1997i - 1997-10-07 08:45:38 -0400 5507 5508 changes to Africa by Paul Eggert 5509 5510 5511 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 5512 5513 corrections for Uruguay (and other locations) 5514 5515 Arthur David Olson's simple-minded fix allowing mktime to both 5516 correctly handle leap seconds and correctly handle tm_sec values 5517 upon which arithmetic has been performed. 5518 5519 5520 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 5521 5522 Paul Eggert's updates 5523 5524 a small change to a function prototype; 5525 5526 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 5527 include information on Around the World in Eighty Days. 5528 5529 5530 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 5531 5532 fixes to zic's error handling 5533 5534 changes inspired by the item circulated on Slovenia 5535 5536 The description of Web resources has been HTMLified for browsing 5537 convenience. 5538 5539 A new piece of tz-related music has been added to the "Music" file. 5540 5541 5542 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 5543 5544 Paul Eggert's latest suggestions 5545 5546 5547 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 5548 5549 changes to "zic.c" to correct performance of the "-s" option 5550 5551 a new file "usno1997" 5552 5553 5554 Release data1997c - 1997-03-04 09:58:18 -0500 5555 5556 changes in Israel 5557 5558 5559 Release 1997b - 1997-02-27 18:34:19 -0500 5560 5561 The data file incorporates the 1997 leap second. 5562 5563 The code file incorporates Arthur David Olson's take on the 5564 zic/multiprocessor/directory-creation situation. 5565 5566 5567 Release 1997a - 1997-01-21 09:11:10 -0500 5568 5569 Paul Eggert's Antarctica (and other changes) 5570 5571 Arthur David Olson finessed the "getopt" issue by checking against 5572 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 5573 is returned while SunOS 5.5's manual says EOF is returned). 5574 5575 5576 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 5577 5578 Paul Eggert's latest changes 5579 5580 5581 Release code1996n - 1996-12-16 09:42:02 -0500 5582 5583 link snapping fix from Bruce Evans (via Garrett Wollman) 5584 5585 5586 Release data1996m - 1996-11-24 02:37:34 -0000 5587 [tzdata1996m.tar.gz is missing!] 5588 5589 Paul Eggert's batch of changes 5590 5591 5592 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 5593 5594 No functional changes here; the files have simply been changed to 5595 make more use of ISO style dates in comments. The names of the above 5596 files now include the year in full. 5597 5598 5599 Release code96l - 1996-09-08 17:12:20 -0400 5600 5601 tzcode96k was missing a couple of pieces. 5602 5603 5604 Release 96k - 1996-09-08 16:06:22 -0400 5605 5606 the latest round of changes from Paul Eggert 5607 5608 the recent Year 2000 material 5609 5610 5611 Release code96j - 1996-07-30 13:18:53 -0400 5612 5613 Set sp->typecnt as suggested by Timothy Patrick Murphy. 5614 5615 5616 Release code96i - 1996-07-27 20:11:35 -0400 5617 5618 Paul's suggested patch for strftime %V week numbers 5619 5620 5621 Release data96i - 1996-07-01 18:13:04 -0400 5622 5623 "northamerica" and "europe" changes by Paul Eggert 5624 5625 5626 Release code96h - 1996-06-05 08:02:21 -0400 5627 5628 fix for handling transitions specified in Universal Time 5629 5630 Some "public domain" notices have also been added. 5631 5632 5633 Release code96g - 1996-05-16 14:00:26 -0400 5634 5635 fix for the simultaneous-DST-and-zone-change challenge 5636 5637 5638 Release data96h - 1996-05-09 17:40:51 -0400 5639 5640 changes by Paul Eggert 5641 5642 5643 Release code96f-data96g - 1996-05-03 03:09:59 -0000 5644 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 5645 5646 The changes get us some of the way to fixing the problems noted in Paul 5647 Eggert's letter yesterday (in addition to a few others). The approach 5648 has been to make zic a bit smarter about figuring out what time zone 5649 abbreviations apply just after the time specified in the "UNTIL" part 5650 of a zone line. Putting the smarts in zic means avoiding having 5651 transition times show up in both "Zone" lines and "Rule" lines, which 5652 in turn avoids multiple transition time entries in time zone files. 5653 (This also makes the zic input files such as "europe" a bit shorter and 5654 should ease maintenance.) 5655 5656 5657 Release data96f - 1996-04-19 19:20:03 -0000 5658 [tzdata96f.tar.gz is missing!] 5659 5660 The only changes are to the "northamerica" file; the time zone 5661 abbreviation for Denver is corrected to MST (and MDT), and the 5662 comments for Mexico have been updated. 5663 5664 5665 Release data96e - 1996-03-19 17:37:26 -0500 5666 5667 Proposals by Paul Eggert, in particular the Portugal change that 5668 comes into play at the end of this month. 5669 5670 5671 Release data96d - 1996-03-18 20:49:39 -0500 5672 5673 [not summarized] 5674 5675 5676 Release code96e - 1996-02-29 15:43:27 -0000 5677 [tzcode96e.tar.gz is missing!] 5678 5679 internationalization changes and the fix to the documentation for strftime 5680 5681 5682 Release code96d-data96c - 1996-02-12 11:05:27 -0500 5683 5684 The "code" file simply updates Bob Kridle's electronic address. 5685 5686 The "data" file updates rules for Mexico. 5687 5688 5689 Release data96b - 1996-01-27 15:44:42 -0500 5690 5691 Kiribati change 5692 5693 5694 Release code96c - 1996-01-16 16:58:15 -0500 5695 5696 leap-year streamlining and binary-search changes 5697 5698 fix to newctime.3 5699 5700 5701 Release code96b - 1996-01-10 20:42:39 -0500 5702 5703 fixes and enhancements from Paul Eggert, including code that 5704 emulates the behavior of recent versions of the SunOS "date" 5705 command. 5706 5707 5708 Release 96a - 1996-01-06 09:08:24 -0500 5709 5710 Israel updates 5711 5712 fixes to strftime.c for correct ISO 8601 week number generation, 5713 plus support for two new formats ('G' and 'g') to give ISO 8601 year 5714 numbers (which are not necessarily the same as calendar year numbers) 5715 5716 5717 Release code95i-data95m - 1995-12-21 12:46:47 -0500 5718 5719 The latest revisions from Paul Eggert are included, the usno1995 5720 file has been updated, and a new file ("WWW") covering useful URLs 5721 has been added. 5722 5723 5724 Release code95h-data95l - 1995-12-19 18:10:12 -0500 5725 5726 A simplification of a macro definition, a change to data for Sudan, 5727 and (for last minute shoppers) notes in the "Music" file on the CD 5728 "Old Man Time". 5729 5730 5731 Release code95g-data95k - 1995-10-30 10:32:47 -0500 5732 5733 (slightly reformatted) 8-bit-clean proposed patch 5734 5735 minor patch: US/Eastern -> America/New_York 5736 5737 snapshot of the USNO's latest data ("usno1995") 5738 5739 some other minor cleanups 5740 5741 5742 Release code95f-data95j - 1995-10-28 21:01:34 -0000 5743 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 5744 5745 European cleanups 5746 5747 support for 64-bit time_t's 5748 5749 optimization in localtime.c 5750 5751 5752 Release code95e - 1995-10-13 13:23:57 -0400 5753 5754 the mktime change to scan from future to past when trying to find time zone 5755 offsets 5756 5757 5758 Release data95i - 1995-09-26 10:43:26 -0400 5759 5760 For Canada/Central, guess that the Sun customer's "one week too 5761 early" was just a approximation, and the true error is one month 5762 too early. This is consistent with the rest of Canada. 5763 5764 5765 Release data95h - 1995-09-21 11:26:48 -0400 5766 5767 latest changes from Paul Eggert 5768 5769 5770 Release code95d - 1995-09-14 11:14:45 -0400 5771 5772 the addition of a "Music" file, which documents four recorded 5773 versions of the tune "Save That Time". 5774 5775 5776 Release data95g - 1995-09-01 17:21:36 -0400 5777 5778 "yearistype" correction 5779 5780 5781 Release data95f - 1995-08-28 20:46:56 -0400 5782 5783 Paul Eggert's change to the australasia file 5784 5785 5786 Release data95e - 1995-07-08 18:02:34 -0400 5787 5788 The only change is a leap second at the end of this year. 5789 Thanks to Bradley White for forwarding news on the leap second. 5790 5791 5792 Release data95d - 1995-07-03 13:26:22 -0400 5793 5794 Paul Eggert's changes 5795 5796 5797 Release data95c - 1995-07-02 19:19:28 -0400 5798 5799 changes to "asia", "backward", "europe", and "southamerica" 5800 (read: northamericacentrics need not apply) 5801 5802 5803 Release code95c - 1995-03-13 14:00:46 -0500 5804 5805 one-line fix for sign extension problems in detzcode 5806 5807 5808 Release 95b - 1995-03-04 11:22:38 -0500 5809 5810 Minor changes in both: 5811 5812 The "code" file contains a workaround for the lack of "unistd.h" in 5813 Microsoft C++ version 7. 5814 5815 The "data" file contains a fixed "Link" for America/Shiprock. 5816 5817 5818 Release 94h - 1994-12-10 12:51:14 -0500 5819 5820 The files: 5821 5822 * incorporate the changes to "zdump" and "date" to make changes to 5823 the "TZ" environment variable permanent; 5824 5825 * incorporate the table changes by Paul Eggert; 5826 5827 * include (and document) support for universal time specifications in 5828 data files - but do not (yet) include use of this feature in the 5829 data files. 5830 5831 Think of this as "TZ Classic" - the software has been set up not to break if 5832 universal time shows up in its input, and data entries have been 5833 left as is so as not to break existing implementations. 5834 5835 5836 Release data94f - 1994-08-20 12:56:09 -0400 5837 5838 (with thanks!) the latest data updates from Paul Eggert 5839 5840 5841 Release data94e - 1994-06-04 13:13:53 -0400 5842 5843 [not summarized] 5844 5845 5846 Release code94g - 1994-05-05 12:14:07 -0400 5847 5848 fix missing "optind.c" and a reference to it in the Makefile 5849 5850 5851 Release code94f - 1994-05-05 13:00:33 -0000 5852 [tzcode94f.tar.gz is missing!] 5853 5854 changes to avoid overflow in difftime, as well as changes to cope 5855 with the 52/53 challenge in strftime 5856 5857 5858 Release code94e - 1994-03-30 23:32:59 -0500 5859 5860 change for the benefit of PCTS 5861 5862 5863 Release 94d - 1994-02-24 15:42:25 -0500 5864 5865 Avoid clashes with POSIX semantics for zones such as GMT+4. 5866 5867 Some other very minor housekeeping is also present. 5868 5869 5870 Release code94c - 1994-02-10 08:52:40 -0500 5871 5872 Fix bug where mkdirs was broken unless you compile with 5873 -fwritable-strings (which is generally losing to do). 5874 5875 5876 Release 94b - 1994-02-07 10:04:33 -0500 5877 5878 work by Paul Eggert who notes: 5879 5880 I found another book of time zone histories by E W Whitman; it's not 5881 as extensive as Shanks but has a few goodies of its own. I used it 5882 to update the tables. I also fixed some more as a result of 5883 correspondence with Adam David and Peter Ilieve, and move some stray 5884 links from 'europe' to 'backward'. I corrected some scanning errors 5885 in usno1989. 5886 5887 As far as the code goes, I fixed zic to allow years in the range 5888 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 5889 And I cleaned up the zic documentation a little bit. 5890 5891 5892 Release data94a - 1994-02-03 08:58:54 -0500 5893 5894 It simply incorporates the recently announced leap second into the 5895 "leapseconds" file. 5896 5897 5898 Release 93g - 1993-11-22 17:28:27 -0500 5899 5900 Paul Eggert has provided a good deal of historic information (based 5901 on Shanks), and there are some code changes to deal with the buglets 5902 that crawled out in dealing with the new information. 5903 5904 5905 Release 93f - 1993-10-15 12:27:46 -0400 5906 5907 Paul Eggert's changes 5908 5909 5910 Release 93e - 1993-09-05 21:21:44 -0400 5911 5912 This has updated data for Israel, England, and Kwajalein. There's 5913 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 5914 Thanks to Paul Eggert and Peter Ilieve for the changes. 5915 5916 5917 Release 93d - 1993-06-17 23:34:17 -0400 5918 5919 new fix and new data on Israel 5920 5921 5922 Release 93c - 1993-06-06 19:31:55 -0400 5923 5924 [not summarized] 5925 5926 5927 Release 93b - 1993-02-02 14:53:58 -0500 5928 5929 updated "leapseconds" file 5930 5931 5932 Release 93 - 1993-01-08 07:01:06 -0500 5933 5934 At kre's suggestion, the package has been split in two - a code piece 5935 (which also includes documentation) that's only of use to folks who 5936 want to recompile things and a data piece useful to anyone who can 5937 run "zic". 5938 5939 The new version has a few changes to the data files, a few 5940 portability changes, and an off-by-one fix (with thanks to 5941 Tom Karzes at deshaw.com for providing a description and a 5942 solution). 5943 5944 5945 Release 92c - 1992-11-21 17:35:36 -0000 5946 [tz92c.tar.Z is missing!] 5947 5948 The fallout from the latest round of DST transitions. 5949 5950 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 5951 there's also a change to "zic.c" that makes it portable to more systems. 5952 5953 5954 Release 92 - 1992-04-25 18:17:03 -0000 5955 [tz92.tar.Z is missing!] 5956 5957 By popular demand (well, at any rate, following a request by kre at munnari) 5958 5959 5960 The 1989 update of the time zone package featured: 5961 5962 * POSIXization (including interpretation of POSIX-style TZ environment 5963 variables, provided by Guy Harris), 5964 * ANSIfication (including versions of "mktime" and "difftime"), 5965 * SVIDulation (an "altzone" variable) 5966 * MACHination (the "gtime" function) 5967 * corrections to some time zone data (including corrections to the rules 5968 for Great Britain and New Zealand) 5969 * reference data from the United States Naval Observatory for folks who 5970 want to do additional time zones 5971 * and the 1989 data for Saudi Arabia. 5972 5973 (Since this code will be treated as "part of the implementation" in some 5974 places and as "part of the application" in others, there's no good way to 5975 name functions, such as timegm, that are not part of the proposed ANSI C 5976 standard; such functions have kept their old, underscore-free names in this 5977 update.) 5978 5979 And the "dysize" function has disappeared; it was present to allow 5980 compilation of the "date" command on old BSD systems, and a version of "date" 5981 is now provided in the package. The "date" command is not created when you 5982 "make all" since it may lack options provided by the version distributed with 5983 your operating system, or may not interact with the system in the same way 5984 the native version does. 5985 5986 Since POSIX frowns on correct leap second handling, the default behavior of 5987 the "zic" command (in the absence of a "-L" option) has been changed to omit 5988 leap second information from its output files. 5989 5990 5991 ----- 5992 Notes 5993 5994 This file contains copies of the part of each release announcement 5995 that talks about the changes in that release. The text has been 5996 adapted and reformatted for the purposes of this file. 5997 5998 Traditionally a release R consists of a pair of tarball files, 5999 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 6000 code2010a, data2012c) consist of just one or the other tarball, and a 6001 few (e.g., code2012c-data2012d) have tarballs with mixed version 6002 numbers. Recent releases also come in an experimental format 6003 consisting of a single tarball tzdb-R.tar.lz with extra data. 6004 6005 Release timestamps are taken from the release's commit (for newer, 6006 Git-based releases), from the newest file in the tarball (for older 6007 releases, where this info is available) or from the email announcing 6008 the release (if all else fails; these are marked with a time zone 6009 abbreviation of -0000 and an "is missing!" comment). 6010 6011 Earlier versions of the code and data were not announced on the tz 6012 list and are not summarized here. 6013 6014 This file is in the public domain. 6015 6016 Local Variables: 6017 coding: utf-8 6018 End: 6019
Indexes created Mon Sep 29 21:09:56 GMT 2025