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ID string in zic's output files
by Arthur David Olson Feb. 22, 2017

Feb. 22, 2017

So much for the idea of storing ID strings in zic output files as (unused) abbreviations. The zone America/Pangnirtung needs 41 bytes to store all the abbreviations it uses: -00 AWT APT AST ADDT ADT EDT EST CST CDT A zic output file can have at most 50 bytes of abbreviations, as set by TZ_MAX_CHARS in tzfile.h The 9 bytes remaining isn't enough for our purposes. (We don't want to boost TZ_MAX_CHARS; localtime.c checks files to ensure they have at most that many abbreviation characters; files with more would be rejected, at least by now-in-the-field binaries compiled from localtime.c) Note that the last component of "Zone" names (such as the "Vevay" in "America/Indiana/Vevay") would fit in the 15 "reserved for future use" bytes at the front of zic output files; full names would not (always) fit, and there would not (always) be room for a prefix such as "@(#)." @dashdashado

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Spaniards’ lack of sleep isn’t a cultural thing – they’re in the wrong time zone
by BASTIAN Michelle Feb. 22, 2017

Feb. 22, 2017

Interesting article in the Guardian on proposed time zone changes in Spain. https://www.theguardian.com/commentisfree/2017/feb/22/spaniards-sleep-time-… --- Dr Michelle Bastian Chancellor’s Fellow, Edinburgh School of Architecture and Landscape Architecture Edinburgh College of Art, University of Edinburgh Level 1, Room 303B The Maltings 20-22 Chambers Street, Edinburgh, EH1 1JZ Phone: +44 (0)131 651 5779 Email: michelle.bastian(a)ed.ac.uk Website: www.michellebastian.net -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.

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[PROPOSED] Mongolia no longer observes DST
by Paul Eggert Feb. 16, 2017

Feb. 16, 2017

* NEWS: Mention this. * asia (Mongolia): DST expires after 2016. --- NEWS | 2 ++ asia | 8 ++++++-- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/NEWS b/NEWS index 10c2cd4..3179d57 100644 --- a/NEWS +++ b/NEWS @@ -6,6 +6,8 @@ Unreleased, experimental changes Changes to future time stamps + Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) + Chile's Region of Magallanes moves from -04/-03 to -03 year-round. Its clocks diverge from America/Santiago starting 2017-05-13 at 23:00, hiving off a new zone America/Punta_Arenas. Although the diff --git a/asia b/asia index 26b6a5b..35774c6 100644 --- a/asia +++ b/asia @@ -2137,14 +2137,18 @@ Rule Mongol 1983 only - Oct 1 0:00 0 - # correction of 02:00 (in the previous edition) not being done correctly # in the latest edition; so ignore it for now. +# From Ganbold Tsagaankhuu (2017-02-09): +# Mongolian Government meeting has concluded today to cancel daylight +# saving time adoption in Mongolia. Source: http://zasag.mn/news/view/16192 + Rule Mongol 1985 1998 - Mar lastSun 0:00 1:00 S Rule Mongol 1984 1998 - Sep lastSun 0:00 0 - # IATA SSIM (1999-09) says Mongolia no longer observes DST. Rule Mongol 2001 only - Apr lastSat 2:00 1:00 S Rule Mongol 2001 2006 - Sep lastSat 2:00 0 - Rule Mongol 2002 2006 - Mar lastSat 2:00 1:00 S -Rule Mongol 2015 max - Mar lastSat 2:00 1:00 S -Rule Mongol 2015 max - Sep lastSat 0:00 0 - +Rule Mongol 2015 2016 - Mar lastSat 2:00 1:00 S +Rule Mongol 2015 2016 - Sep lastSat 0:00 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] # Hovd, a.k.a. Chovd, Dund-Us, Dzhargalant, Khovd, Jirgalanta -- 2.9.3

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New NIST leap-seconds.list
by Tony Finch Feb. 16, 2017

Feb. 16, 2017

The file at ftp://time.nist.gov/pub/leap-seconds.list has been updated to reflect Bulletin C53 and now has an expiry date of 28 December 2017. Tony. -- f.anthony.n.finch <dot(a)dotat.at> http://dotat.at/ - I xn--zr8h punycode Fair Isle: Cyclonic becoming northwest 5 or 6, then variable 4 later. Moderate, occasionally slight. Showers until later. Moderate or good.

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Bad Map Projection #79
by Guy Harris Feb. 15, 2017

Feb. 15, 2017

https://xkcd.com/1799/ "Where each country *should* be, based on its time zone(s)"

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[PROPOSED 1/3] Remove many invented abbreviations in 'australasia'
by Paul Eggert Feb. 14, 2017

Feb. 14, 2017

* NEWS: Document this. * australasia (Australia/Eucla, Australia/Lord_Howe) (Antarctica/Macquarie, Indian/Christmas, Indian/Cocos, Pacific/Fiji) (Pacific/Gambier, Pacific/Marquesas, Pacific/Tahiti, Pacific/Tarawa) (Pacific/Enderbury, Pacific/Kiritimati, Pacific/Majuro) (Pacific/Kwajalein, Pacific/Chuuk, Pacific/Pohnpei, Pacific/Kosrae) (Pacific/Nauru, Pacific/Noumea, Pacific/Chatham, Pacific/Rarotonga) (Pacific/Niue, Pacific/Norfolk, Pacific/Palau, Pacific/Port_Moresby) (Pacific/Bougainville, Pacific/Pitcairn, Pacific/Pago_Pago) (Pacific/Apia, Pacific/Guadalcanal, Pacific/Fakaofo, Pacific/Funafuti): (Pacific/Wake, Pacific/Efate, Pacific/Wallis): Use numeric time zone abbreviations instead of invented ones, for time zones with UT offsets that are integer minutes. --- NEWS | 15 ++++-- australasia | 148 ++++++++++++++++++++++++++++-------------------------------- 2 files changed, 79 insertions(+), 84 deletions(-) diff --git a/NEWS b/NEWS index 3179d57..23bcd8f 100644 --- a/NEWS +++ b/NEWS @@ -37,11 +37,16 @@ Unreleased, experimental changes part of the ongoing project of removing invented abbreviations. This avoids the need to invent an abbreviation for the new Chilean new zone. Similarly, switch from invented to numeric time zone - abbreviations for Afghanistan, the Azores, Bangladesh, Bhutan, the - British Indian Ocean Territory, Brunei, Dubai, East Timor, - Greenland, Indochina, Iran, Iraq, Malaysia, the Maldives, - Mongolia, Myanmar, Nepal, the Philippines, Qatar, St Pierre and - Miquelon, Saudi Arabia, Singapore, and Xinjiang; for half-hour DST + abbreviations for Afghanistan, American Samoa, the Azores, + Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, + Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, Dubai, East + Timor, Eucla, Fiji, French Polynesia, Greenland, Indochina, Iran, + Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, the Maldives, + Marshall Is, Micronesia, Mongolia, Myanmar, Nauru, Nepal, New + Caledonia, Niue, Norfolk I, Palau, Papua New Guinea, the + Philippines, Pitcairn, Qatar, St Pierre & Miquelon, Samoa, Saudi + Arabia, Singapore, Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, + Wallis & Futuna, and Xinjiang; for half-hour daylight saving time in Belize before 1944 and in the Dominican Republic before 1975; and for Canary Islands before 1946, for Madeira before 1967, for Iceland before 1969, for Indian Summer Time before 1942, for diff --git a/australasia b/australasia index 0bca53e..1280022 100644 --- a/australasia +++ b/australasia @@ -44,8 +44,8 @@ Zone Australia/Perth 7:43:24 - LMT 1895 Dec 8:00 Aus AW%sT 1943 Jul 8:00 AW AW%sT Zone Australia/Eucla 8:35:28 - LMT 1895 Dec - 8:45 Aus ACW%sT 1943 Jul - 8:45 AW ACW%sT + 8:45 Aus +0845/+0945 1943 Jul + 8:45 AW +0845/+0945 # Queensland # @@ -212,7 +212,8 @@ Rule LH 2008 max - Apr Sun>=1 2:00 0 S Rule LH 2008 max - Oct Sun>=1 2:00 0:30 D Zone Australia/Lord_Howe 10:36:20 - LMT 1895 Feb 10:00 - AEST 1981 Mar - 10:30 LH LH%sT + 10:30 LH +1030/+1130 1985 Jul + 10:30 LH +1030/+11 # Australian miscellany # @@ -250,19 +251,19 @@ Zone Antarctica/Macquarie 0 - -00 1899 Nov 0 - -00 1948 Mar 25 10:00 Aus AE%sT 1967 10:00 AT AE%sT 2010 Apr 4 3:00 - 11:00 - MIST # Macquarie I Standard Time + 11:00 - +11 # Christmas # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Indian/Christmas 7:02:52 - LMT 1895 Feb - 7:00 - CXT # Christmas Island Time + 7:00 - +07 # Cocos (Keeling) Is # These islands were ruled by the Ross family from about 1830 to 1978. # We don't know when standard time was introduced; for now, we guess 1900. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Indian/Cocos 6:27:40 - LMT 1900 - 6:30 - CCT # Cocos Islands Time + 6:30 - +0630 # Fiji @@ -375,16 +376,16 @@ Rule Fiji 2014 max - Nov Sun>=1 2:00 1:00 S Rule Fiji 2015 max - Jan Sun>=15 3:00 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Fiji 11:55:44 - LMT 1915 Oct 26 # Suva - 12:00 Fiji FJ%sT # Fiji Time + 12:00 Fiji +12/+13 # French Polynesia # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Gambier -8:59:48 - LMT 1912 Oct # Rikitea - -9:00 - GAMT # Gambier Time + -9:00 - -09 Zone Pacific/Marquesas -9:18:00 - LMT 1912 Oct - -9:30 - MART # Marquesas Time + -9:30 - -0930 Zone Pacific/Tahiti -9:58:16 - LMT 1912 Oct # Papeete - -10:00 - TAHT # Tahiti Time + -10:00 - -10 # Clipperton (near North America) is administered from French Polynesia; # it is uninhabited. @@ -399,15 +400,15 @@ Link Pacific/Guam Pacific/Saipan # N Mariana Is # Kiribati # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Tarawa 11:32:04 - LMT 1901 # Bairiki - 12:00 - GILT # Gilbert Is Time + 12:00 - +12 Zone Pacific/Enderbury -11:24:20 - LMT 1901 - -12:00 - PHOT 1979 Oct # Phoenix Is Time - -11:00 - PHOT 1995 - 13:00 - PHOT + -12:00 - -12 1979 Oct + -11:00 - -11 1995 + 13:00 - +13 Zone Pacific/Kiritimati -10:29:20 - LMT 1901 - -10:40 - LINT 1979 Oct # Line Is Time - -10:00 - LINT 1995 - 14:00 - LINT + -10:40 - -1040 1979 Oct + -10:00 - -10 1995 + 14:00 - +14 # N Mariana Is # See Pacific/Guam. @@ -415,31 +416,31 @@ Zone Pacific/Kiritimati -10:29:20 - LMT 1901 # Marshall Is # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Majuro 11:24:48 - LMT 1901 - 11:00 - MHT 1969 Oct # Marshall Islands Time - 12:00 - MHT + 11:00 - +11 1969 Oct + 12:00 - +12 Zone Pacific/Kwajalein 11:09:20 - LMT 1901 - 11:00 - MHT 1969 Oct - -12:00 - KWAT 1993 Aug 20 # Kwajalein Time - 12:00 - MHT + 11:00 - +11 1969 Oct + -12:00 - -12 1993 Aug 20 + 12:00 - +12 # Micronesia # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Chuuk 10:07:08 - LMT 1901 - 10:00 - CHUT # Chuuk Time + 10:00 - +10 Zone Pacific/Pohnpei 10:32:52 - LMT 1901 # Kolonia - 11:00 - PONT # Pohnpei Time + 11:00 - +11 Zone Pacific/Kosrae 10:51:56 - LMT 1901 - 11:00 - KOST 1969 Oct # Kosrae Time - 12:00 - KOST 1999 - 11:00 - KOST + 11:00 - +11 1969 Oct + 12:00 - +12 1999 + 11:00 - +11 # Nauru # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Nauru 11:07:40 - LMT 1921 Jan 15 # Uaobe - 11:30 - NRT 1942 Mar 15 # Nauru Time - 9:00 - JST 1944 Aug 15 - 11:30 - NRT 1979 May - 12:00 - NRT + 11:30 - +1130 1942 Mar 15 + 9:00 - +09 1944 Aug 15 + 11:30 - +1130 1979 May + 12:00 - +12 # New Caledonia # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S @@ -450,7 +451,7 @@ Rule NC 1996 only - Dec 1 2:00s 1:00 S Rule NC 1997 only - Mar 2 2:00s 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Noumea 11:05:48 - LMT 1912 Jan 13 # Nouméa - 11:00 NC NC%sT + 11:00 NC +11/+12 ############################################################################### @@ -491,8 +492,8 @@ Zone Pacific/Auckland 11:39:04 - LMT 1868 Nov 2 11:30 NZ NZ%sT 1946 Jan 1 12:00 NZ NZ%sT Zone Pacific/Chatham 12:13:48 - LMT 1868 Nov 2 - 12:15 - CHAST 1946 Jan 1 - 12:45 Chatham CHA%sT + 12:15 - +1215 1946 Jan 1 + 12:45 Chatham +1245/+1345 Link Pacific/Auckland Antarctica/McMurdo @@ -514,8 +515,8 @@ Rule Cook 1979 1991 - Mar Sun>=1 0:00 0 - Rule Cook 1979 1990 - Oct lastSun 0:00 0:30 HS # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Rarotonga -10:39:04 - LMT 1901 # Avarua - -10:30 - CKT 1978 Nov 12 # Cook Is Time - -10:00 Cook CK%sT + -10:30 - -1030 1978 Nov 12 + -10:00 Cook -10/-0930 ############################################################################### @@ -523,29 +524,29 @@ Zone Pacific/Rarotonga -10:39:04 - LMT 1901 # Avarua # Niue # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Niue -11:19:40 - LMT 1901 # Alofi - -11:20 - NUT 1951 # Niue Time - -11:30 - NUT 1978 Oct 1 - -11:00 - NUT + -11:20 - -1120 1951 + -11:30 - -1130 1978 Oct 1 + -11:00 - -11 # Norfolk # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Norfolk 11:11:52 - LMT 1901 # Kingston - 11:12 - NMT 1951 # Norfolk Mean Time - 11:30 - NFT 1974 Oct 27 02:00 # Norfolk T. - 11:30 1:00 NFST 1975 Mar 2 02:00 - 11:30 - NFT 2015 Oct 4 02:00 - 11:00 - NFT + 11:12 - +1112 1951 + 11:30 - +1130 1974 Oct 27 02:00 + 11:30 1:00 +1230 1975 Mar 2 02:00 + 11:30 - +1130 2015 Oct 4 02:00 + 11:00 - +11 # Palau (Belau) # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Palau 8:57:56 - LMT 1901 # Koror - 9:00 - PWT # Palau Time + 9:00 - +09 # Papua New Guinea # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Port_Moresby 9:48:40 - LMT 1880 9:48:32 - PMMT 1895 # Port Moresby Mean Time - 10:00 - PGT # Papua New Guinea Time + 10:00 - +10 # # From Paul Eggert (2014-10-13): # Base the Bougainville entry on the Arawa-Kieta region, which appears to have @@ -560,28 +561,26 @@ Zone Pacific/Port_Moresby 9:48:40 - LMT 1880 # and seem to have controlled it until their 1945-08-21 surrender. # # The Autonomous Region of Bougainville switched from UT +10 to +11 -# on 2014-12-28 at 02:00. They call +11 "Bougainville Standard Time"; -# abbreviate this as BST. See: +# on 2014-12-28 at 02:00. They call +11 "Bougainville Standard Time". +# See: # http://www.bougainville24.com/bougainville-issues/bougainville-gets-own-tim… # Zone Pacific/Bougainville 10:22:16 - LMT 1880 9:48:32 - PMMT 1895 - 10:00 - PGT 1942 Jul - 9:00 - JST 1945 Aug 21 - 10:00 - PGT 2014 Dec 28 2:00 - 11:00 - BST + 10:00 - +10 1942 Jul + 9:00 - +09 1945 Aug 21 + 10:00 - +10 2014 Dec 28 2:00 + 11:00 - +11 # Pitcairn # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Pitcairn -8:40:20 - LMT 1901 # Adamstown - -8:30 - PNT 1998 Apr 27 0:00 - -8:00 - PST # Pitcairn Standard Time + -8:30 - -0830 1998 Apr 27 0:00 + -8:00 - -08 # American Samoa Zone Pacific/Pago_Pago 12:37:12 - LMT 1879 Jul 5 -11:22:48 - LMT 1911 - -11:00 - NST 1967 Apr # N=Nome - -11:00 - BST 1983 Nov 30 # B=Bering -11:00 - SST # S=Samoa Link Pacific/Pago_Pago Pacific/Midway # in US minor outlying islands @@ -662,17 +661,17 @@ Rule WS 2012 max - Sep lastSun 3:00 1 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Apia 12:33:04 - LMT 1879 Jul 5 -11:26:56 - LMT 1911 - -11:30 - WSST 1950 - -11:00 WS S%sT 2011 Dec 29 24:00 # S=Samoa - 13:00 WS WS%sT + -11:30 - -1130 1950 + -11:00 WS -11/-10 2011 Dec 29 24:00 + 13:00 WS +13/+14 # Solomon Is # excludes Bougainville, for which see Papua New Guinea # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Guadalcanal 10:39:48 - LMT 1912 Oct # Honiara - 11:00 - SBT # Solomon Is Time + 11:00 - +11 -# Tokelau Is +# Tokelau # # From Gwillim Law (2011-12-29) # A correspondent informed me that Tokelau, like Samoa, will be skipping @@ -693,8 +692,8 @@ Zone Pacific/Guadalcanal 10:39:48 - LMT 1912 Oct # Honiara # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Fakaofo -11:24:56 - LMT 1901 - -11:00 - TKT 2011 Dec 30 # Tokelau Time - 13:00 - TKT + -11:00 - -11 2011 Dec 30 + 13:00 - +13 # Tonga # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S @@ -713,7 +712,7 @@ Zone Pacific/Tongatapu 12:19:20 - LMT 1901 # Tuvalu # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Funafuti 11:56:52 - LMT 1901 - 12:00 - TVT # Tuvalu Time + 12:00 - +12 # US minor outlying islands @@ -775,7 +774,7 @@ Zone Pacific/Funafuti 11:56:52 - LMT 1901 # Wake # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Wake 11:06:28 - LMT 1901 - 12:00 - WAKT # Wake Time + 12:00 - +12 # Vanuatu @@ -788,12 +787,12 @@ Rule Vanuatu 1992 1993 - Jan Sun>=23 0:00 0 - Rule Vanuatu 1992 only - Oct Sun>=23 0:00 1:00 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Efate 11:13:16 - LMT 1912 Jan 13 # Vila - 11:00 Vanuatu VU%sT # Vanuatu Time + 11:00 Vanuatu +11/+12 # Wallis and Futuna # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Wallis 12:15:20 - LMT 1901 - 12:00 - WFT # Wallis & Futuna Time + 12:00 - +12 ############################################################################### @@ -804,7 +803,7 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901 # tz(a)iana.org for general use in the future). For more, please see # the file CONTRIBUTING in the tz distribution. -# From Paul Eggert (2014-10-31): +# From Paul Eggert (2017-02-10): # # Unless otherwise specified, the source for data through 1990 is: # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), @@ -829,28 +828,19 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901 # A reliable and entertaining source about time zones is # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997). # -# I invented the abbreviations marked '*' in the following table; -# the rest are from earlier versions of this file, or from other sources. +# The following abbreviations are from other sources. # Corrections are welcome! # std dst # LMT Local Mean Time # 8:00 AWST AWDT Western Australia -# 8:45 ACWST ACWDT Central Western Australia* -# 9:00 JST Japan # 9:30 ACST ACDT Central Australia # 10:00 AEST AEDT Eastern Australia +# 10:00 GST Guam through 2000 # 10:00 ChST Chamorro -# 10:30 LHST LHDT Lord Howe* -# 11:00 BST Bougainville* # 11:30 NZMT NZST New Zealand through 1945 # 12:00 NZST NZDT New Zealand 1946-present -# 12:15 CHAST Chatham through 1945* -# 12:45 CHAST CHADT Chatham 1946-present* -# 13:00 WSST WSDT (western) Samoa 2011-present* -# -11:30 WSST Western Samoa through 1950* # -11:00 SST Samoa # -10:00 HST Hawaii -# - 8:00 PST Pitcairn* # # See the 'northamerica' file for Hawaii. # See the 'southamerica' file for Easter I and the Galápagos Is. -- 2.9.3

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tzid in zoneinfo?
by Steven R. Loomis Feb. 13, 2017

Feb. 13, 2017

Dear TZ list, I would like to propose that zic-compiled binaries (such as what shows up in /etc/zoneinfo) include the tzid (such as ‘America/New_York’). I work on the ICU project (Unicode’s International Components for Unicode) and also CLDR (Unicode’s Common Locale Data Repository). The ICU library consumes tz data, and uses the localized data from CLDR to (among other things) display translated time zone names of various sorts, and format different types of dates. A perpetual problem is trying to detect the actual timezone of a platform. Ideally something like the TZ variable is set to a valid tz id such as America/New_York which we can use directly. Otherwise, we try various approaches - including trying to resolve /etc/localtime’s symlink to see if it points to a file which appears to be in some sort of zic-compiled tree. This brings up bugs such as http://bugs.icu-project.org/trac/ticket/12770 because various platforms use different paths as the targets of /etc/localtime - and some times, it's a doubly linked symlink. In other cases, the file is just copied, and we have to trawl through /usr/share/zoneinfo looking for a binary file which matches. There are other methods employed if these fail, but I think this will suffice for our purposes. Even if ICU consumed the /etc/zoneinfo file directly, or was able to call the host to perform the calculations it needs, that would not suffice in terms of localized content. As I think has been noted on this list before, it does not seem to be a goal of the tz database to collect these translated names, and tz-link.html does link to CLDR as one possible source of translations. I think that this would benefit other users as well, by making zone files self identifiable. I think the JDK has to do similar analysis. Some JavaScript containers (Mozilla especially) now support IANA tz ids, such as in https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Ob… Any thoughts or comments? Thanks, Steven

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Re: [tz] Version in zoneinfo files?
by Guy Harris Feb. 10, 2017

Feb. 10, 2017

On Oct 25, 2015, at 10:55 AM, Paul G <paul(a)ganssle.io> wrote: > I'm not suggesting that it be impossible to create a weird result when asking for the version, just that there's a standard place for the version to go, and preferably the standard default gives you something that you expected. I.e., something that works most of the time is sufficient? So what exactly is the intended use of this version field? > As it is now, you're virtually guaranteed to have a lot of incompatibility because there's nothing you can point to that says, "This is the canonical way to store version information about zoneinfo files", and no standard has emerged on how to do this as is. > > On 10/25/2015 01:51 PM, Guy Harris wrote: >> >> On Oct 25, 2015, at 10:37 AM, Paul G <paul(a)ganssle.io> wrote: >> >>> On 10/25/2015 01:35 PM, Guy Harris wrote: >>> >>>> So where would zic get the version information to put into the binary files? >>> >>> My understanding is that it's the VERSION= line of the Makefile in the tzdata tarballs. >> >> I.e., you're proposing that the value of the VERSION value in the Makefile be passed as an argument to zic, and zic would put the value of that argument into a field in the files? >> >> So, if the goal is to provide a "reliable way to get the version information in a cross-platform way", what would ensure that this field be set properly, for some value of "properly", everywhere that binary tzdata files are generated? >> >> I.e., what is to guarantee that >> >> 1) nobody downstream change VERSION if they aren't changing the zic files from what's distributed >> >> and >> >> 2) people change it "properly" if the files don't correspond to a particular version of files that were distributed (e.g., if some downstream supplier takes 2015q and adds some changes mentioned on the list to it before 2015r comes out with those changes plus other changes, they should call the resulting files something other than "2015q" or "2015r")? >> >

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Re: [tz] Help needed on Tz database
by Bill Seymour Feb. 2, 2017

Feb. 2, 2017

Hi, François, I'm surprised that that old paper is still around. I wrote it mainly for my own benefit when I was trying to understand the tz source files. The way I read the C-EUR rules is that there was a switch to summer time in 1940, but no change back until 1942; so when Minsk changed to C-EUR, the steady state implied by the most recent C-EUR transition would be UTC+1:00; and so the wall clock time in Minsk would be UTC+2:00 and the abbreviation would be CEST. But I'm just an amateur at civil time. I'm including the tz mailing list in this message's recipients in case somebody who really knows will correct me if I'm wrong. 8-) --Bill On Thu, Feb 2, 2017 at 1:25 AM, Francois Rouleau <rouf0007(a)gmail.com> wrote: > Hi > I read "How to read the Tz Database" but there is a case (maybe more later) > that I dont understand. From https://www.timeanddate.com, for Minsk, I see > that: > > "Saturday, June 28, 1941, 12:00:00 midnight clocks were > turned backward 1 hour to Friday, June 27, 1941, 11:00:00 pm local > daylight time instead" > > > > Zone: > ===== > > # Zone NAME GMTOFF RULES FORMAT [UNTIL] > Zone Europe/Minsk 1:50:16 - LMT 1880 > 1:50 - MMT 1924 May 2 # Minsk Mean Time > 2:00 - EET 1930 Jun 21 > 3:00 - MSK 1941 Jun 28 > 1:00 C-Eur CE%sT 1944 Jul 3 > 3:00 Russia MSK/MSD 1990 > 3:00 - MSK 1991 Mar 31 2:00s > 2:00 Russia EE%sT 2011 Mar 27 2:00s > 3:00 - +03 > > Rules: > > RuleName From To Month Day Start Add S/D > Rule C-Eur 1917 1918 - Sep Mon>=15 2:00s 0 - > Rule C-Eur 1940 only - Apr 1 2:00s 1:00 S > Rule C-Eur 1942 only - Nov 2 2:00s 0 - > Rule C-Eur 1943 only - Mar 29 2:00s 1:00 S > Rule C-Eur 1943 only - Oct 4 2:00s 0 - > Rule C-Eur 1944 1945 - Apr Mon>=1 2:00s 1:00 S > Rule C-Eur 1944 only - Oct 2 2:00s 0 - > > > Question: > > On June 28, 1941, the C-Eur rule takes over. What row of the rule section > should I look at? > > Is it the letter column (in rule) that will tell me if this new time is STD > or DST ? > > > Thanks > > François >

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Magallanes region from Chile will keep DST all year round
by Juan Correa Jan. 30, 2017

Jan. 30, 2017

There is no official decree published yet, but it has been reported by official Chilean government Twitter accounts that Magallanes región ( https://en.wikipedia.org/wiki/Magallanes_Region) will keep DST (UTC -3) all year round Sources: - https://twitter.com/presidencia_cl/status/805398903604576256 (from Press Office of the Presidency of Chile, "President Michelle Bachelet signs the decree that establishes a single timezone for Magallanes región") - https://twitter.com/AndresReboll/status/805398964690386944 (from Minister of Energy, "after a participative (sic) process and thoughtful investigation, decided to establish a single timezone (*summer*) for Magallanes) - http://www.soychile.cl/Santiago/Sociedad/2016/12/04/433428/Bachelet-firmo-e… As a reminder, Chile has (since 2016) DST from August to May following year The biggest city in the region is Punta Arenas, with over 123 thousand inhabitants. The whole population for Magallanes region is 164.661 people As soon as the decree gets published, I'll share it here -- Juan Correa Poblete PS Labs (http://www.pslabs.cl)

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