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Complete list of IANA time zone abbreviations
by Tobias Conradi April 16, 2013

April 16, 2013

Is a complete list of IANA time zone abbreviations available in the WWW? I found: * http://en.wikipedia.org/wiki/List_of_time_zone_abbreviations * http://www.timeanddate.com/library/abbreviations/timezones/ * http://www.timegenie.com/timezones.php All list ACDT which, as of today, is not an IANA abbreviation, so these listings are not what I am looking for. -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com

1 0

Suggesting an ISO standard for time zone identification - possible replacement of IANA abbreviations
by Tobias Conradi April 16, 2013

April 16, 2013

Dear Mr. Carpenter, this email is send to you, because you are listed as the secretary for the "TC 46/SC 9 Identification and description". Maybe you can forward it to the relevant office or tell me where else I can email to. I suggest that the ISO creates an ISO standard for time zone identification. Current abbreviations in the IANA time zone database are ambiguous, e.g. IST may refer to Israel Standard Time or India Standard Time. The standard could be used in the IANA time zone database and projects that collect time zone related data, e.g. laws and translations of names. Since time zone law is country related one could look whether ISO 3166 can be used. The IANA time zone database has the stated aim of being correct for all regions in the world after the year 1970. Although the earliest ISO 3166 country code standard on the ISO website is ISO 3166:1981, web search for ISO 3166 1974 gives several hits claiming the first publication was in 1974. If there have been countries between 1970 and 1974 that have no ISO 3166 code one can use codes from the user-assigned code space. So the first two letters might be ISO 3166-1 alpha-2 country code based. But I suggest checking whether the alpha-3 codes or numeric codes are a better fit. Further letters may then mark regions inside a country and special restricted time shifts, e.g. daylight saving time. Such a structured set could look like: AUEDT - Australia Eastern Daylight saving Time AUCDT - United States Central Daylight saving Time AUWDT - Australia Western Daylight saving Time EUEDT - EU Eastern Daylight saving Time EUCDT - EU Central Daylight saving Time EUWDT - EU Western Daylight saving Time IDEST - Indonesia Eastern Standard Time IDCST - Indonesia Central Standard Time IDWST - Indonesia Western Standard Time USEDT - United States Eastern Daylight saving Time USCDT - United States Central Daylight saving Time USPDT - United States Pacific Daylight saving Time Kind regards Tobias Conradi -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com

1 0

Palestine DST starts on 2013-03-29
by Steffen Thorsen April 15, 2013

April 15, 2013

The following news sources tells that Palestine will " start daylight saving time from midnight on Friday, March 29, 2013" (translated). http://www.samanews.com/index.php?act=Show&id=154120 (Gaza) http://safa.ps/details/news/99844/%D8%B1%D8%A7%D9%85-%D8%A7%D9%84%D9%84%D9%… (Ramallah, West Bank) No end date given, but we assume it will end the last Sunday of September. Our background info: http://www.timeanddate.com/news/time/palestine-starts-dst-2013.html Best regards, Steffen Thorsen - timeanddate.com

4 6

morroco in summer time the 28th april
by Sebastien WILLEMIJNS April 13, 2013

April 13, 2013

Hello, Morocco was a thread here so i speak again about it / saw on google: http://www.lemag.ma/Le-Maroc-passe-a-l-heure-d-ete-le-dimanche-28-avril_a69… H+60 the 28th april at 2am. this time will be suspended during the ramadan month.

2 1

Patch use LHDT/LHST/LHHDT since HD HS DD DS are common practice
by Tobias Conradi April 13, 2013

April 13, 2013

Patch australasia.20130411.withLHHDT is linked from http://anna.info/wiki/ANNA_time_zone_database - I don't link to the actual location, because that may change. And I don't email, because I don't know what the email client does with the file. The patch includes AEST/AEDT ACST/ACDT AWST/AWDT CWST/CWDT LHDT/LHST/LHHDT -------- The bom.gov.au-patch introduces new syntax, which for itself might be fine, but this new syntax is less informative than the established one and might be seen as deterioration to the whole database. No single use of single "D" for non-1:00 saving has been found by me. There is one single "D" in a LHDT but there it referred to a 1:00 saving. Be consistent, apply common practice established by the maintainers and use: HD 0:30 LHHDT Australia/Lord_Howe For non 1:00 DST offsets the database contains: DD 2:00 NDDT America/St_Johns IDDT Asia/Jerusalem DS 2:00 MDST - Moscow Double Summer Time, BDST - British Double Summer Time HD 0:30 CHDT America/Belize CHDT EHDT America/Santo_Domingo HS 0:30 UYHST America/Montevideo IHST Asia/Colombo CKHST Pacific/Rarotonga HS 0:20 GHST Africa/Accra -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/

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Re: [tz] [PATCH 0/2] Follow Australian common usage and update CST/CST to CST/CDT and EST/EST to EST/EDT etc [SEC=UNCLASSIFIED]
by Peter Stagg April 12, 2013

April 12, 2013

I would like to offer (again) the following evidence in support of Timothy's request for a patch to eliminate the ambiguous time zone abbreviations from the TZ Database. The assertion from John Mackin that "We in Australia have _never_ referred to DST as `daylight' time." is patently untrue - the video from four corners (posted previously - see below) is clear evidence that the term is used and has been in use since well before John Mackin's statement from 1991. Language is a living thing it changes and evolves over time so it is possible that in 1991 "summer time" was in vogue. It is also possible that John Mackin comes from the culture of British migrants that may well have used this term due to their British heritage. Either way the Google searches of government web sites show that the phrase "daylight saving" is used, formally, more frequently then "summer time". There are many problems with searching the broader context of .au web sites for frequency of use of "EST" vs. "EDT" and "summer time" vs. "daylight saving": "EST" vs. "EDT" Only tree of the four states in the "Eastern Standard Timezone" have daylight savings and they only have it for aprox. four of the twelve months in the year. And as someone pointed out before many web sites unwittingly use the TZ Database data to automatically timestamp pages. So the frequency of use of "EST" is destined to be much higher then "EDT" and therefore the search is meaningless. "summer time" vs. "daylight saving" "daylight saving" has, pretty much, one unambiguous meaning where as "summer time" (summertime) has so many that have nothing what so ever to do with "daylight saving": - "Summertime" is an aria composed by George Gershwin for the 1935 opera Porgy and Bess. - Summertime is a 1955 American/British Technicolor drama film directed by David Lean - May refer to "British summer time"; given Australia's long association with the mother country old newspapers etc. online often refer to "British summer time" - It may refer to (as it does in many countries) the *seasonal* time of summer as in "summer time and the living is easy". As evidence of this I searched Trove (the National Library of Australia's online collection of digitised Newspapers etc.) <http://trove.nla.gov.au> for these phrases separately "EST", "EDT", "summer time" and "daylight saving". I searched only Australian content and only the Digitised newspapers section, the results were as follows: "EST" = 2,049,093 "EDT" = 27,401 "Summer time" = 55,120 "daylight saving" = 11,960 The only one of these which returns relatively unambiguous results is "daylight saving" and here is why: The first full page of the search for "EST" does not contain a single reference to time. "EST" (Est.) is a very commonly used abbreviation for Established for one thing. "EDT" is just as ambiguous. "daylight saving", is much less ambiguous all-though searching for it will return the likes of "Nothing but fair weather and daylight saved". The earliest use of the term (we never use) is in 1908 referring to the "Daylight Saving Bill" it is referred to in more than a dozen daily newspapers of the time. "Mr. Robert Pearce, tbe member for the Leek division of Staffordshire, is a humorist. To the intense amusement of the House the other day he gravely introducedva measure called the "Daylight_ Saving Bill," by which he proposes, bv an ingenious juggling with' the hoursof the clock, to actually give us more daylight! Mr. Pcarce's project is on the first four Sundays in April to put on the clock 20 minutes between 2 a.m. and 3 p.m., each hour, therefore consisting of only 40 minutes. Similarly it is propo^d in September that the same hour in the morning should consist of 80 minutes. The annual gain of daylight Mr. Pearce esti-mates at 210 hours." [sic.] "Summer time" very rarely refers to Australian "daylight saving time" as can be seen from a selection of results from the first page of the search... ----- Sunday Times (Perth, WA : 1902 - 1954) Sunday 2 November 1947 p 2 Article ... Summertime LONDON, Sat: British summertime time ends tomorrow, when G.M.T. will be restored. Change officially occurs at 3.30 a.m. ----- The Daily News (Perth, WA : 1882 - 1950) Saturday 22 August 1936 Edition: GOLDFIELDS EDITION p 16 Article ... Summertime Summertime is coming near; I heard a blowfly yesterday. Mosquitoes buzzing here and there Are signs that summer's on the way. People talk about the flowers In bloom, and skies of azure blue. I can tell that winter's hours Are few another way, can't you? Winter jumpers are not seen So ... ----- Examiner (Launceston, Tas. : 1900 - 1954) Saturday 24 February 1917 Edition: DAILY p 7 Article ... SUMMER TIME. It is understood that the Government will introduce summer time to operate between April 8 and September 23. ... ----- Oh. Before you jump on that last one look at the dates then realise that it was in a section of the paper headed "British Parliament." In conclusion there is little real unambiguous evidence out there that prooves "summer time" is more commonly used in Australia *to refer to* "Daylight Saving(s) Time" than the phrase "Daylight Saving(s) Time". In actual fact there is more evidence to prove the oposite. Formally the majority of Australian government websites refer to "Daylight Saving(s) Time" and this is the part of the TZ Database that we Australian users disagree with and wish to have changed. ----- search: legislation "standard time" "daylight saving" site:.gov.au About 25,600 results (0.21 seconds) search: legislation "standard time" "summer time" site:.gov.au About 15,600 results (0.14 seconds) N.B. ".gov.au" searches all state and federal official sites as they all use this domain. (e.g. Federal = just .gov.au, State i.e. Victoria = .vic.gov.au ). ----- An interesting video from the 1970's Four Corners program on the ABC (Australia's national broadcaster, ICYDK) on the introduction of "Daylight Saving" in Tasmania. Note the consistent use of that term "Daylight Saving", "Summer Time" is never mentioned (FYI It's a predominantly British term) and take a look at the flight attendant's bonnet! http://www.abc.net.au/archives/80days/stories/2012/01/19/3415208.htm Regards, Peter Stagg Web Developer - Radar Systems, AMDIS, +61 3 9669-4232, www.bom.gov.au ----- Date: Thu, 11 Apr 2013 09:50:04 +1000 From: Timothy Arceri <T.Arceri(a)bom.gov.au> Subject: [tz] [PATCH 0/2] Follow Australian common usage and update CST/CST to CST/CDT and EST/EST to EST/EDT etc [SEC=UNCLASSIFIED] To: "'tz(a)iana.org' (tz(a)iana.org)" <tz(a)iana.org> Message-ID: <7F491A8A71010C4E8B0266E3478C047A0220B1760322(a)BOM-VMBX-HO.bom.gov.au> Content-Type: text/plain; charset="us-ascii" <delitia> The reason for the current situation is documented in the Australasia data file: >From John Mackin (1991-03-06): "We in Australia have _never_ referred to DST as `daylight' time. It is called `summer' time. Now by a happy coincidence, `summer' and `standard' happen to start with the same letter; hence, the abbreviation does _not_ change..." -----

9 17

Gaza DST
by Keith Harris April 12, 2013

April 12, 2013

Hi All, Sorry I couldn't find a way to bump this issue via the original thread. Just wondering what the latest is on getting this change released. I've tested the latest version of the db from the repository and it has jodatime reporting the correct time for Gaza today. Be great to get this in place as I've got people missing their conference calls by an hour! (Thanks so much for all the hard work by everyone on the list - wonderful to see at least one bit of the world's technology just working the way it should :-D ) Keith Harris SoftlySoftware <http://softlysoftware.com>

2 1

Macquarie Island - ISO 3166-1 code AQ vs AU
by Tobias Conradi April 12, 2013

April 12, 2013

Was Re: [tz] EST/EDT vs AEST/AEDT in AQ [SEC=UNCLASSIFIED] I think the research for the correct ISO country for Macquarie Island is easier followable if kept in a separate thread. On Fri, Apr 12, 2013 at 10:45 AM, Tobias Conradi <mail.2012(a)tobiasconradi.com> wrote: > On Fri, Apr 12, 2013 at 5:35 AM, Timothy Arceri <T.Arceri(a)bom.gov.au> wrote: >>>From: tobias.conradi(a)gmail.com [mailto:tobias.conradi@gmail.com] On Behalf Of Tobias >>>> We are simply trying to get the daylight savings abbreviations changed >>>> to what is *actually* used in Australia. >>>Macquarie Island in the IANA time zone database is AQ and not Australia. >> >> Macquarie island is part of Australia: http://en.wikipedia.org/wiki/Macquarie_Island > > In Wikipedia, not in the IANA time zone database. > > ftp://ftp.iana.org/tz/data/zone.tab > > AQ -5430+15857 Antarctica/Macquarie Macquarie Island Station, Macquarie Island http://en.wikipedia.org/wiki/Macquarie_Island categorized as belonging to Tasmania, which in turn is given as part of Australia. What is the reason to have Macquarie Island as AQ Antartica in the IANA time zone database? -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com

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[PATCH 1/2] Follow Australian common usage and update CST/CST to CST/CDT and EST/EST to EST/EDT etc [SEC=UNCLASSIFIED]
by Timothy Arceri April 12, 2013

April 12, 2013

--- australasia 2013-02-21 07:00:40.000000000 +0000 +++ australasia_new 2013-04-10 00:39:26.000000000 +0000 @@ -13,13 +13,13 @@ # Please see the notes below for the controversy about "EST" versus "AEST" etc. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Aus 1917 only - Jan 1 0:01 1:00 - -Rule Aus 1917 only - Mar 25 2:00 0 - -Rule Aus 1942 only - Jan 1 2:00 1:00 - -Rule Aus 1942 only - Mar 29 2:00 0 - -Rule Aus 1942 only - Sep 27 2:00 1:00 - -Rule Aus 1943 1944 - Mar lastSun 2:00 0 - -Rule Aus 1943 only - Oct 3 2:00 1:00 - +Rule Aus 1917 only - Jan 1 0:01 1:00 D +Rule Aus 1917 only - Mar 25 2:00 0 S +Rule Aus 1942 only - Jan 1 2:00 1:00 D +Rule Aus 1942 only - Mar 29 2:00 0 S +Rule Aus 1942 only - Sep 27 2:00 1:00 D +Rule Aus 1943 1944 - Mar lastSun 2:00 0 S +Rule Aus 1943 only - Oct 3 2:00 1:00 D # Go with Whitman and the Australian National Standards Commission, which # says W Australia didn't use DST in 1943/1944. Ignore Whitman's claim that # 1944/1945 was just like 1943/1944. @@ -28,25 +28,25 @@ # Northern Territory Zone Australia/Darwin 8:43:20 - LMT 1895 Feb 9:00 - CST 1899 May - 9:30 Aus CST + 9:30 Aus C%sT # Western Australia # # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule AW 1974 only - Oct lastSun 2:00s 1:00 - -Rule AW 1975 only - Mar Sun>=1 2:00s 0 - -Rule AW 1983 only - Oct lastSun 2:00s 1:00 - -Rule AW 1984 only - Mar Sun>=1 2:00s 0 - -Rule AW 1991 only - Nov 17 2:00s 1:00 - -Rule AW 1992 only - Mar Sun>=1 2:00s 0 - -Rule AW 2006 only - Dec 3 2:00s 1:00 - -Rule AW 2007 2009 - Mar lastSun 2:00s 0 - -Rule AW 2007 2008 - Oct lastSun 2:00s 1:00 - +Rule AW 1974 only - Oct lastSun 2:00s 1:00 D +Rule AW 1975 only - Mar Sun>=1 2:00s 0 S +Rule AW 1983 only - Oct lastSun 2:00s 1:00 D +Rule AW 1984 only - Mar Sun>=1 2:00s 0 S +Rule AW 1991 only - Nov 17 2:00s 1:00 D +Rule AW 1992 only - Mar Sun>=1 2:00s 0 S +Rule AW 2006 only - Dec 3 2:00s 1:00 D +Rule AW 2007 2009 - Mar lastSun 2:00s 0 S +Rule AW 2007 2008 - Oct lastSun 2:00s 1:00 D Zone Australia/Perth 7:43:24 - LMT 1895 Dec - 8:00 Aus WST 1943 Jul - 8:00 AW WST + 8:00 Aus W%sT 1943 Jul + 8:00 AW W%sT Zone Australia/Eucla 8:35:28 - LMT 1895 Dec - 8:45 Aus CWST 1943 Jul - 8:45 AW CWST + 8:45 Aus CW%sT 1943 Jul + 8:45 AW CW%sT # Queensland # @@ -62,42 +62,42 @@ # so use Lindeman. # # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule AQ 1971 only - Oct lastSun 2:00s 1:00 - -Rule AQ 1972 only - Feb lastSun 2:00s 0 - -Rule AQ 1989 1991 - Oct lastSun 2:00s 1:00 - -Rule AQ 1990 1992 - Mar Sun>=1 2:00s 0 - -Rule Holiday 1992 1993 - Oct lastSun 2:00s 1:00 - -Rule Holiday 1993 1994 - Mar Sun>=1 2:00s 0 - +Rule AQ 1971 only - Oct lastSun 2:00s 1:00 D +Rule AQ 1972 only - Feb lastSun 2:00s 0 S +Rule AQ 1989 1991 - Oct lastSun 2:00s 1:00 D +Rule AQ 1990 1992 - Mar Sun>=1 2:00s 0 S +Rule Holiday 1992 1993 - Oct lastSun 2:00s 1:00 D +Rule Holiday 1993 1994 - Mar Sun>=1 2:00s 0 S Zone Australia/Brisbane 10:12:08 - LMT 1895 - 10:00 Aus EST 1971 - 10:00 AQ EST + 10:00 Aus E%sT 1971 + 10:00 AQ E%sT Zone Australia/Lindeman 9:55:56 - LMT 1895 - 10:00 Aus EST 1971 - 10:00 AQ EST 1992 Jul - 10:00 Holiday EST + 10:00 Aus E%sT 1971 + 10:00 AQ E%sT 1992 Jul + 10:00 Holiday E%sT # South Australia # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule AS 1971 1985 - Oct lastSun 2:00s 1:00 - -Rule AS 1986 only - Oct 19 2:00s 1:00 - -Rule AS 1987 2007 - Oct lastSun 2:00s 1:00 - -Rule AS 1972 only - Feb 27 2:00s 0 - -Rule AS 1973 1985 - Mar Sun>=1 2:00s 0 - -Rule AS 1986 1990 - Mar Sun>=15 2:00s 0 - -Rule AS 1991 only - Mar 3 2:00s 0 - -Rule AS 1992 only - Mar 22 2:00s 0 - -Rule AS 1993 only - Mar 7 2:00s 0 - -Rule AS 1994 only - Mar 20 2:00s 0 - -Rule AS 1995 2005 - Mar lastSun 2:00s 0 - -Rule AS 2006 only - Apr 2 2:00s 0 - -Rule AS 2007 only - Mar lastSun 2:00s 0 - -Rule AS 2008 max - Apr Sun>=1 2:00s 0 - -Rule AS 2008 max - Oct Sun>=1 2:00s 1:00 - +Rule AS 1971 1985 - Oct lastSun 2:00s 1:00 D +Rule AS 1986 only - Oct 19 2:00s 1:00 D +Rule AS 1987 2007 - Oct lastSun 2:00s 1:00 D +Rule AS 1972 only - Feb 27 2:00s 0 S +Rule AS 1973 1985 - Mar Sun>=1 2:00s 0 S +Rule AS 1986 1990 - Mar Sun>=15 2:00s 0 S +Rule AS 1991 only - Mar 3 2:00s 0 S +Rule AS 1992 only - Mar 22 2:00s 0 S +Rule AS 1993 only - Mar 7 2:00s 0 S +Rule AS 1994 only - Mar 20 2:00s 0 S +Rule AS 1995 2005 - Mar lastSun 2:00s 0 S +Rule AS 2006 only - Apr 2 2:00s 0 S +Rule AS 2007 only - Mar lastSun 2:00s 0 S +Rule AS 2008 max - Apr Sun>=1 2:00s 0 S +Rule AS 2008 max - Oct Sun>=1 2:00s 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Australia/Adelaide 9:14:20 - LMT 1895 Feb 9:00 - CST 1899 May - 9:30 Aus CST 1971 - 9:30 AS CST + 9:30 Aus C%sT 1971 + 9:30 AS C%sT # Tasmania # @@ -106,106 +106,106 @@ # says King Island didn't observe DST from WWII until late 1971. # # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule AT 1967 only - Oct Sun>=1 2:00s 1:00 - -Rule AT 1968 only - Mar lastSun 2:00s 0 - -Rule AT 1968 1985 - Oct lastSun 2:00s 1:00 - -Rule AT 1969 1971 - Mar Sun>=8 2:00s 0 - -Rule AT 1972 only - Feb lastSun 2:00s 0 - -Rule AT 1973 1981 - Mar Sun>=1 2:00s 0 - -Rule AT 1982 1983 - Mar lastSun 2:00s 0 - -Rule AT 1984 1986 - Mar Sun>=1 2:00s 0 - -Rule AT 1986 only - Oct Sun>=15 2:00s 1:00 - -Rule AT 1987 1990 - Mar Sun>=15 2:00s 0 - -Rule AT 1987 only - Oct Sun>=22 2:00s 1:00 - -Rule AT 1988 1990 - Oct lastSun 2:00s 1:00 - -Rule AT 1991 1999 - Oct Sun>=1 2:00s 1:00 - -Rule AT 1991 2005 - Mar lastSun 2:00s 0 - -Rule AT 2000 only - Aug lastSun 2:00s 1:00 - -Rule AT 2001 max - Oct Sun>=1 2:00s 1:00 - -Rule AT 2006 only - Apr Sun>=1 2:00s 0 - -Rule AT 2007 only - Mar lastSun 2:00s 0 - -Rule AT 2008 max - Apr Sun>=1 2:00s 0 - +Rule AT 1967 only - Oct Sun>=1 2:00s 1:00 D +Rule AT 1968 only - Mar lastSun 2:00s 0 S +Rule AT 1968 1985 - Oct lastSun 2:00s 1:00 D +Rule AT 1969 1971 - Mar Sun>=8 2:00s 0 S +Rule AT 1972 only - Feb lastSun 2:00s 0 S +Rule AT 1973 1981 - Mar Sun>=1 2:00s 0 S +Rule AT 1982 1983 - Mar lastSun 2:00s 0 S +Rule AT 1984 1986 - Mar Sun>=1 2:00s 0 S +Rule AT 1986 only - Oct Sun>=15 2:00s 1:00 D +Rule AT 1987 1990 - Mar Sun>=15 2:00s 0 S +Rule AT 1987 only - Oct Sun>=22 2:00s 1:00 D +Rule AT 1988 1990 - Oct lastSun 2:00s 1:00 D +Rule AT 1991 1999 - Oct Sun>=1 2:00s 1:00 D +Rule AT 1991 2005 - Mar lastSun 2:00s 0 S +Rule AT 2000 only - Aug lastSun 2:00s 1:00 D +Rule AT 2001 max - Oct Sun>=1 2:00s 1:00 D +Rule AT 2006 only - Apr Sun>=1 2:00s 0 S +Rule AT 2007 only - Mar lastSun 2:00s 0 S +Rule AT 2008 max - Apr Sun>=1 2:00s 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Australia/Hobart 9:49:16 - LMT 1895 Sep 10:00 - EST 1916 Oct 1 2:00 - 10:00 1:00 EST 1917 Feb - 10:00 Aus EST 1967 - 10:00 AT EST + 10:00 1:00 EDT 1917 Feb + 10:00 Aus E%sT 1967 + 10:00 AT E%sT Zone Australia/Currie 9:35:28 - LMT 1895 Sep 10:00 - EST 1916 Oct 1 2:00 - 10:00 1:00 EST 1917 Feb - 10:00 Aus EST 1971 Jul - 10:00 AT EST + 10:00 1:00 EDT 1917 Feb + 10:00 Aus E%sT 1971 Jul + 10:00 AT E%sT # Victoria # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule AV 1971 1985 - Oct lastSun 2:00s 1:00 - -Rule AV 1972 only - Feb lastSun 2:00s 0 - -Rule AV 1973 1985 - Mar Sun>=1 2:00s 0 - -Rule AV 1986 1990 - Mar Sun>=15 2:00s 0 - -Rule AV 1986 1987 - Oct Sun>=15 2:00s 1:00 - -Rule AV 1988 1999 - Oct lastSun 2:00s 1:00 - -Rule AV 1991 1994 - Mar Sun>=1 2:00s 0 - -Rule AV 1995 2005 - Mar lastSun 2:00s 0 - -Rule AV 2000 only - Aug lastSun 2:00s 1:00 - -Rule AV 2001 2007 - Oct lastSun 2:00s 1:00 - -Rule AV 2006 only - Apr Sun>=1 2:00s 0 - -Rule AV 2007 only - Mar lastSun 2:00s 0 - -Rule AV 2008 max - Apr Sun>=1 2:00s 0 - -Rule AV 2008 max - Oct Sun>=1 2:00s 1:00 - +Rule AV 1971 1985 - Oct lastSun 2:00s 1:00 D +Rule AV 1972 only - Feb lastSun 2:00s 0 S +Rule AV 1973 1985 - Mar Sun>=1 2:00s 0 S +Rule AV 1986 1990 - Mar Sun>=15 2:00s 0 S +Rule AV 1986 1987 - Oct Sun>=15 2:00s 1:00 D +Rule AV 1988 1999 - Oct lastSun 2:00s 1:00 D +Rule AV 1991 1994 - Mar Sun>=1 2:00s 0 S +Rule AV 1995 2005 - Mar lastSun 2:00s 0 S +Rule AV 2000 only - Aug lastSun 2:00s 1:00 D +Rule AV 2001 2007 - Oct lastSun 2:00s 1:00 D +Rule AV 2006 only - Apr Sun>=1 2:00s 0 S +Rule AV 2007 only - Mar lastSun 2:00s 0 S +Rule AV 2008 max - Apr Sun>=1 2:00s 0 S +Rule AV 2008 max - Oct Sun>=1 2:00s 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Australia/Melbourne 9:39:52 - LMT 1895 Feb - 10:00 Aus EST 1971 - 10:00 AV EST + 10:00 Aus E%sT 1971 + 10:00 AV E%sT # New South Wales # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule AN 1971 1985 - Oct lastSun 2:00s 1:00 - -Rule AN 1972 only - Feb 27 2:00s 0 - -Rule AN 1973 1981 - Mar Sun>=1 2:00s 0 - -Rule AN 1982 only - Apr Sun>=1 2:00s 0 - -Rule AN 1983 1985 - Mar Sun>=1 2:00s 0 - -Rule AN 1986 1989 - Mar Sun>=15 2:00s 0 - -Rule AN 1986 only - Oct 19 2:00s 1:00 - -Rule AN 1987 1999 - Oct lastSun 2:00s 1:00 - -Rule AN 1990 1995 - Mar Sun>=1 2:00s 0 - -Rule AN 1996 2005 - Mar lastSun 2:00s 0 - -Rule AN 2000 only - Aug lastSun 2:00s 1:00 - -Rule AN 2001 2007 - Oct lastSun 2:00s 1:00 - -Rule AN 2006 only - Apr Sun>=1 2:00s 0 - -Rule AN 2007 only - Mar lastSun 2:00s 0 - -Rule AN 2008 max - Apr Sun>=1 2:00s 0 - -Rule AN 2008 max - Oct Sun>=1 2:00s 1:00 - +Rule AN 1971 1985 - Oct lastSun 2:00s 1:00 D +Rule AN 1972 only - Feb 27 2:00s 0 S +Rule AN 1973 1981 - Mar Sun>=1 2:00s 0 S +Rule AN 1982 only - Apr Sun>=1 2:00s 0 S +Rule AN 1983 1985 - Mar Sun>=1 2:00s 0 S +Rule AN 1986 1989 - Mar Sun>=15 2:00s 0 S +Rule AN 1986 only - Oct 19 2:00s 1:00 D +Rule AN 1987 1999 - Oct lastSun 2:00s 1:00 D +Rule AN 1990 1995 - Mar Sun>=1 2:00s 0 S +Rule AN 1996 2005 - Mar lastSun 2:00s 0 S +Rule AN 2000 only - Aug lastSun 2:00s 1:00 D +Rule AN 2001 2007 - Oct lastSun 2:00s 1:00 D +Rule AN 2006 only - Apr Sun>=1 2:00s 0 S +Rule AN 2007 only - Mar lastSun 2:00s 0 S +Rule AN 2008 max - Apr Sun>=1 2:00s 0 S +Rule AN 2008 max - Oct Sun>=1 2:00s 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Australia/Sydney 10:04:52 - LMT 1895 Feb - 10:00 Aus EST 1971 - 10:00 AN EST + 10:00 Aus E%sT 1971 + 10:00 AN E%sT Zone Australia/Broken_Hill 9:25:48 - LMT 1895 Feb 10:00 - EST 1896 Aug 23 9:00 - CST 1899 May - 9:30 Aus CST 1971 - 9:30 AN CST 2000 - 9:30 AS CST + 9:30 Aus C%sT 1971 + 9:30 AN C%sT 2000 + 9:30 AS C%sT # Lord Howe Island # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule LH 1981 1984 - Oct lastSun 2:00 1:00 - -Rule LH 1982 1985 - Mar Sun>=1 2:00 0 - -Rule LH 1985 only - Oct lastSun 2:00 0:30 - -Rule LH 1986 1989 - Mar Sun>=15 2:00 0 - -Rule LH 1986 only - Oct 19 2:00 0:30 - -Rule LH 1987 1999 - Oct lastSun 2:00 0:30 - -Rule LH 1990 1995 - Mar Sun>=1 2:00 0 - -Rule LH 1996 2005 - Mar lastSun 2:00 0 - -Rule LH 2000 only - Aug lastSun 2:00 0:30 - -Rule LH 2001 2007 - Oct lastSun 2:00 0:30 - -Rule LH 2006 only - Apr Sun>=1 2:00 0 - -Rule LH 2007 only - Mar lastSun 2:00 0 - -Rule LH 2008 max - Apr Sun>=1 2:00 0 - -Rule LH 2008 max - Oct Sun>=1 2:00 0:30 - +Rule LH 1981 1984 - Oct lastSun 2:00 1:00 D +Rule LH 1982 1985 - Mar Sun>=1 2:00 0 S +Rule LH 1985 only - Oct lastSun 2:00 0:30 D +Rule LH 1986 1989 - Mar Sun>=15 2:00 0 S +Rule LH 1986 only - Oct 19 2:00 0:30 D +Rule LH 1987 1999 - Oct lastSun 2:00 0:30 D +Rule LH 1990 1995 - Mar Sun>=1 2:00 0 S +Rule LH 1996 2005 - Mar lastSun 2:00 0 S +Rule LH 2000 only - Aug lastSun 2:00 0:30 D +Rule LH 2001 2007 - Oct lastSun 2:00 0:30 D +Rule LH 2006 only - Apr Sun>=1 2:00 0 S +Rule LH 2007 only - Mar lastSun 2:00 0 S +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 - EST 1981 Mar - 10:30 LH LHST + 10:30 LH LH%sT # Australian miscellany # @@ -841,39 +841,15 @@ # Implementation Dates of Daylight Saving Time within Australia # </a> summarizes daylight saving issues in Australia. -# From Arthur David Olson (2005-12-12): -# <a href="http://www.lawlink.nsw.gov.au/lawlink/Corporate/ll_agdinfo.nsf/pages/commun…"> -# Lawlink NSW:Daylight Saving in New South Wales -# </a> covers New South Wales in particular. - -# From John Mackin (1991-03-06): -# We in Australia have _never_ referred to DST as `daylight' time. -# It is called `summer' time. Now by a happy coincidence, `summer' -# and `standard' happen to start with the same letter; hence, the -# abbreviation does _not_ change... -# The legislation does not actually define abbreviations, at least -# in this State, but the abbreviation is just commonly taken to be the -# initials of the phrase, and the legislation here uniformly uses -# the phrase `summer time' and does not use the phrase `daylight -# time'. -# Announcers on the Commonwealth radio network, the ABC (for Australian -# Broadcasting Commission), use the phrases `Eastern Standard Time' -# or `Eastern Summer Time'. (Note, though, that as I say in the -# current australasia file, there is really no such thing.) Announcers -# on its overseas service, Radio Australia, use the same phrases -# prefixed by the word `Australian' when referring to local times; -# time announcements on that service, naturally enough, are made in UTC. - -# From Arthur David Olson (1992-03-08): -# Given the above, what's chosen for year-round use is: -# CST for any place operating at a GMTOFF of 9:30 -# WST for any place operating at a GMTOFF of 8:00 -# EST for any place operating at a GMTOFF of 10:00 +# From Timothy Arceri (2013-04-09) +# Webpage that lists the Australian Governments recommended time zone names and abbreviations: +# http://australia.gov.au/about-australia/our-country/time +# +# NSW Goverment time definitions (covers time zones and abbreviations): +# http://www.communityrelations.lawlink.nsw.gov.au/cru/daylight/definitions_o… # From Chuck Soper (2006-06-01): -# I recently found this Australian government web page on time zones: -# <http://www.australia.gov.au/about-australia-13time> -# And this government web page lists time zone names and abbreviations: +# This government web page lists time zone names and abbreviations: # <http://www.bom.gov.au/climate/averages/tables/daysavtm.shtml> # From Paul Eggert (2001-04-05), summarizing a long discussion about "EST" @@ -957,6 +933,33 @@ # saying that both AEST/AEDT and EST/EST are widely used and # understood in Australia. +# From Timothy Arceri (2013-04-09), results from a long discussion about +# "EST" - Eastern Summer Time versus "EDT" - Eastern Daylight Time etc.: +# +# * Do Australians more often use "EDT" or "EST"? +# +# 875,000 "Eastern Standard Time (EST)" site:.au +# 655,000 "Eastern Standard Time (AEST)" site:.au +# +# 6 "Eastern Summer Time (EST)" site:.au +# 64 "Eastern Summer Time (AEST)" site:.au +# 30,500 "Eastern Daylight Time (EDT)" site:.au +# 180,000 "Eastern Daylight Time (AEDT)" site:.au +# +# 357,000 "Central Standard Time (CST)" site:.au +# 316 "Central Standard Time (ACST)" site:.au +# +# 4 "Central Summer Time (CST)" site:.au +# 0 "Central Summer Time (ACST)" site:.au +# +# 19,600 "Central Daylight Time (CDT)" site:.au +# 157 "Central Daylight Time (ACDT)" site:.au +# +# Here we are only looking at cases where the time zone abbreviation +# has been defined. These results show that the abbreviation for Daylight +# time EDT/AEDT/CDT/ACDT is overwhelmingly greater than the usage of the +# abbreviation for Summer time EST/AEST/CST/ACST + # From Paul Eggert (1995-12-19): # Shanks & Pottenger report 2:00 for all autumn changes in Australia and NZ. # Mark Prior writes that his newspaper

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EST/EDT vs AEST/AEDT in AQ
by Tobias Conradi April 11, 2013

April 11, 2013

To use "EST/EDT" instead of "AEST/AEDT" in Antartica as is by this patch: http://mm.icann.org/pipermail/tz/2013-April/018994.html and EST as is done by the IANA time zone database, could be a source of future confusion and discussion. Especially if other countries that have an EST/EDT abbreviated time inherited their abbreviations to AQ-zones. This is a vote to use AEST/AEDT, or switch completely to Internationalized time point unique abbreviations. -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/

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