- tz - lists.iana.org

Patched file australasia - time point unique abbreviations for Australia
by Tobias Conradi April 10, 2013

April 10, 2013

A public domain patched australasia file can be found via: http://anna.info/wiki/ANNA_time_zone_database The new abbreviations are: AEST/AEDT ACST/ACDT AWST/AWDT and currently without "A" prefix: CWST/CWDT - Eucla LHST/LHDT/LHHT - Lord Howe The letters before the final T mean: S - no daylight saving D - one hour daylight saving H - half hour daylight saving Error reports are welcome. Maybe someone can create a patch file. Some may favor using internationally disambiguated abbreviations, since AE might be interpreted as United Arab Emirates, AC as Ascension Island and AW as Aruba. It could also be desired to have constant length. Such internationally time point unique abbreviations could be used by CLDR for localization. The format could be "<country code><location><type>T" and a set for Australia, covering - except for LMTs (LMT=local mean time) - all times in the IANA time zone database could be: AUEST/AUEDT - East AUCST/AUCDT - Central AUWST/AUWDT - West AUUST/AUUDT - Eucla AUHST/AUHDT/AUHHT - Lord Howe -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/

6 11

Re: [tz] Ambiguous abbreviations for Australian timezones when daylight savings is in affect [SEC=UNCLASSIFIED]
by Peter Stagg April 9, 2013

April 9, 2013

So I see the patronising attitude of the TZ database coordinators rages on :-) It has been said that their are inconsistencies in both Australian Federal & State legislation and common usage. This point can be conceded even though it is based on an assessment far removed from the actual situation. It has also been stated that the aim is to use labels and abbreviations for timezones that are most commonly used and understood. A good point as the intention is to make sure they are widely understood (FYI irony). However the basis for the decision to use the ambiguous terms and abbreviations 'Eastern Standard Time'; 'EST' and 'Eastern Summer Time'; 'EST' is a highly unscientific internet search and the paternalistic opinions of the coordinators. As there appears to be a fondness for search engine results in decision making why not try this one: australia EDT site:http://mm.icann.org/pipermail/tz/ Take a look at the number of times that, mostly Australians, have asked for the terms and abbreviations used for Australian time zones (esp. *D*aylight Saving Time) to be disambiguated. You might also look at the amount of frustration and acrimony the one-eyed, condescending responses of the coordinators and mostly non-Australian list members cause and consider how often this stops people from bothering to voice opinions and endeavouring to resolve issues. ----- On a lighter note and at the risk of hindering my own argument I'm surprised none of you jokers from out-of-town have pointed out 'ESST'; 'Eastern Standard Summer Time'. "Eastern Standard Summer Time" "ESST" site:.au about 1,810 results PS 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 Peter Stagg

9 13

Letter/s for half hour daylight saving
by Tobias Conradi April 9, 2013

April 9, 2013

I just discovered that there is some precedence to use different lettering for half hour saving time. ftp://ftp.iana.org/tz/data/australasia Rule Cook 1978 only - Nov 12 0:00 0:30 HS 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 So the recent LHHT did only deviate insofar as to use one letter (H) instead of two (HS). I added HS to the IANA time zone database documentation of abbreviations hosted at anna.info : http://anna.info/x/wiki/w/index.php?title=IANA_time_zone_database&diff=82&o… -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/

1 0

TimeZine Info Problem
by dcernosia＠aol.com April 8, 2013

April 8, 2013

Guys, Ran into a little problem when I tried to process the latest TimeZone files ... a few rules, such as the one listed below, didn't process correctly ... I think there are extra tabs separating the data ... have you had any other complaints? Morocco 2013 only - Jul 9 3:00 0 Morocco 2013 only - Aug 8 2:00 1:00 S Morocco 2016 only - Jun 7 3:00 0 Morocco 2016 only - Jul 7 2:00 1:00 S Morocco 2019 only - May 6 3:00 0 - Morocco 2019 only - Jun 5 2:00 1:00 S Morocco 2022 only - May 3 2:00 1:00 S Thanks, - Dennis

3 2

Rule based management vs TZ Coordinator will or voting / fork reason
by Tobias Conradi April 8, 2013

April 8, 2013

Emails such as the recent ones about ambiguous time zone acronyms can be avoided if the management of the database would be more rule based. It seems there is no rule prohibiting one abbreviation from referring to two offsets within one country at a given point in time. So adding a rule to the Theory file prohibiting this would be one step. The other issue is, that if rules exists, e.g. ftp://ftp.iana.org/tz/code/Theory ----- Scope of the tz database ----- The tz database attempts to record the history and predicted future of all computer-based clocks that track civil time. To represent this data, the world is partitioned into regions whose clocks all agree about time stamps that occur after the somewhat-arbitrary cutoff point of the POSIX Epoch (1970-01-01 00:00:00 UTC). that they are also enforced. But the TZ Coordinator is sometimes not enforcing them, as the Siberia bug (Asia/Tomsk and Asia/Barnaul patch was provided to the list) shows. Arbitrary application of rules can be a fork reason. -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/

1 0

Ambiguous abbreviations for Australian timezones when daylight savings is in affect [SEC=UNCLASSIFIED]
by Peter Stagg April 8, 2013

April 8, 2013

Thanks to David et al for taking this initiative. In respons to the specific questions posed: - would the preference be to preceed the abbreviations with A, or not? I think the 'A' is most apropriate and is in keeping with my understanding of conventioned followed in Australia. It would also be very easy to deal with in the situation where a programer may want to drop the 'A' - historically, how far back should we apply the patch to the abbreviations. I'm in favour of retro-fitting it to the start of Daylight Savings in Australia (sate-based dependancies taken into account). After all its a bit like BC and AD. If you we're wandering around in 200BC you had no idea it was 200BC but today we would not refer to it as anything else (unless you don't use the christian calendar, of course). ________________________________________ Date: Sun, 07 Apr 2013 21:19:36 -0400 From: David Patte ? <dpatte(a)relativedata.com> Subject: Re: [tz] Ambiguous abbreviations for Australian timezones when daylight savings is in affect [SEC=UNCLASSIFIED] To: tz(a)iana.org Message-ID: <51621B28.4030105(a)relativedata.com> Content-Type: text/plain; charset=UTF-8; format=flowed A group of us from the list have decided to put together a proposed patch to change the Australian abbreviations to S/D abbreviations. We are hoping, that the maintainers of tz decide to implement the patch in the tz database. In the mean time: - would the preference be to preceed the abbreviations with A, or not? - historically, how far back should we apply the patch to the abbreviations. We will submit the patch to the list for review, and hope it is implemented. But if it is not, we have decided to fork tz and provide a new distribution with the new abbreviations applied. David Patte Relative Data, Inc. _______________________________________________

1 0

Re: [tz] Ambiguous abbreviations for Australian timezones when daylight savings is in affect [SEC=UNCLASSIFIED]
by Peter Stagg April 8, 2013

April 8, 2013

"Lies, damned lies, and statistics" - I guess it depends on how you cut the cloth: 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) Yes in some cases you will find the following: 'daylight saving time ("summer time")'; that to me supports the notion of "daylight saving" ahead of "summer time". 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 ). I've noticed through my various searches of government websites that whilst the legislative instruments for time may often use the term "Summer Time" (Vic & NSW only) their public facing information sites use the term "Daylight Saving". http://www.nsw.gov.au/daylight-saving http://www.business.vic.gov.au/operating-a-business/how-to-start/trading-ho… http://australia.gov.au/about-australia/our-country/time http://www.dpac.tas.gov.au/divisions/policy/daylightsavings http://www.cmd.act.gov.au/communication/holidays http://www.safework.sa.gov.au/show_page.jsp?id=2675 WA, QLD and NT do not have daylight savings but still: http://www.premiers.qld.gov.au/publications/categories/reports/daylight-sav… http://www.parliament.wa.gov.au/parliament/bills.nsf/BillProgressPopup?open… And yes these are cherry-picked - to the most part these ar all public facing official government pages communicating to the Australian populous about "Daylight Saving" not "Summer Time" - if "Summer Time" was lingua franca, don't you think they (we) would use it? Peter Stagg

1 0

Please remove ambiguous time zone abreviations for Australia [SEC=UNCLASSIFIED]
by Robert Greenwood April 8, 2013

April 8, 2013

Hi all, I know this might sound like a broken record to some, but could we please remove ambiguous time zone abreviations for Australia? I can't for the life of me understand why anyone would want to keep the Australian zones as EST/EST and CST/CST rather than EST/EDT and CST/CDT or AEST/AEDT and ACST/ACDT. Stating that there in no need to change it is nonsensical. It is obvious that using the abbreviation Eastern Standard Time (EST) and Eastern Summer Time (EST) is useless at best. The fact that if you have time zones you need them to be unambiguous is self evident, otherwise why have them. Stating that there are conflicting messages from state and federal government regarding the use of time zones in Australia is misleading. No State or federal government proposes the use of EST/EST and CST/CST as the correct usage of time zone abbreviations. Whilst there is some inconsistency in the usage of AEDT/EDT/EDST within those sites when they explicitly state which time zone should be used it is AEST/AEDT and ACST/ACDT. Finally, the arguments around the usage of Eastern/Central Summer Time (EST/CST) being the status Quo amongst Australians based off the survey conducted in the following linked is flawed: http://mm.icann.org/pipermail/tz/2012-October/018364.html searching for EDT or EST by themselves will return a number of things that have no relation to time zones. Similarly, "Eastern Summer Time" and "Eastern Daylight Time" do not necessarily relate to the usage of a particular abbreviation. Searching for the number of hits for the following strings gives a better understanding of the usage of the relevant time zone acronyms in Australia: Google results for au domain: 45,100: "Eastern Standard Time (EST)" 82,400: "Eastern Standard Time (AEST)" 34,900: "Eastern Summer Time (EST)" 117: "Eastern Summer Time (AEST)" 72,100: "Eastern Daylight Time (EDT)" 218,000: "Eastern Daylight Time (AEDT)" 387,000: "Central Standard Time (CST)" 8,030: "Central Standard Time (ACST)" 3: "Central Summer Time (CST)" 3: "Central Summer Time (ACST)" 22,300: "Central Daylight Time (CDT)" 1,460: "Central Daylight Time (ACDT)" 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. Furthermore, varients of the search for "Eastern Daylight Saving/s Time (A/EDT)" give another ~3,000 hits and variants of "Eastern Daylight Saving/s Time (A/EDST)" only give ~ 500 results. However, a cursory glance still shows that many of these results are not related to Australia. So this method is still flawed but I cannot think of a better way of searching for the status Quo. Please change the time zone abbreviations in Australia to EST/EDT and CST/CDT or AEST/AEDT and ACST/ACDT. ----------------------------------------------------------------------------- Dr Robert Greenwood | Tsunami Modelling Support National Meteorological and Oceanographic Centre Bureau of Meteorology GPO Box 1289 Melbourne VIC 3001 Level 11, 700 Collins Street, Docklands VIC 3008 Tel: +61 3 9616 8455 | r.greenwood(a)bom.gov.au<mailto:r.greenwood@bom.gov.au> -----------------------------------------------------------------------------

2 1

White House petitioned to end DST
by Arthur David Olson April 4, 2013

April 4, 2013

An electronic petition to "Eliminate the bi-annual time change caused by Daylight Savings [sic] Time" appears at... https://petitions.whitehouse.gov/petition/eliminate-bi-annual-time-change-c… ...and as of this writing has about 6,000 of the 100,000 electronic signatures required for an official White House response. @dashdashado

3 3

How to compute the moment of the next DST change
by Simon Perreault April 4, 2013

April 4, 2013

Dear time experts, I want to write a cron job or similar that activates one week prior to daylight saving time changes. (Or, more generically, one week prior to any time jumps, for any reason, DST or else.) Any pointers? I have looked at the usual places: POSIX time functions, various date/time modules on CPAN, etc. Nothing seems to do that computation. Do I need to parse the tz database myself? Thanks, Simon

14 20