July 2011 - tz - lists.iana.org

Re: OnTimeZone site update
by Zoidiasoft Tech July 21, 2011

July 21, 2011

> Along those lines, thanks to Curtis Manwaring from this list for > alerting me to the observed time zone anomaly for the Vidal > California area... Thanks. The question I have is how did the cell phone company (Verizon) know what time it was in Vidal, CA? There are what look to be 2 cell phone towers, one at Vidal Junction behind the only gas station (and California produce checkpoint) and another just over a mile south of the junction between rte 62 and 95. The time changes from Arizona (Mountain) to Pacific when traveling north of Vidal toward the junction. They must have a database somewhere and it would be nice to get a copy of that for the Olson database. Hopefully they've kept records going back several years. Sincerely, Curtis Manwaring

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New site with North American Time Zone borders
by Steve Jones July 21, 2011

July 21, 2011

Apologies if this is not of interest here. I'm new, recently joining to keep up on changes in order to keep a website with time zone data up to date. There is likely nothing here that will be news to anybody, but you may find it interesting: http://ontimezone.com I will be grateful for any feedback about the data, especially corrections! Cheers, Steve Jones

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ITU-R redefinition, UTC as a timezone?
by Steve Allen July 12, 2011

July 12, 2011

This list has mentioned that in 2012 January the Radiocommunications Assembly (RA) will probably vote on a revision of ITU-R TF.460, the document which defines the time scale used in radio broadcasts, and thus also in internet time services. For more details on the decade-long history of that effort see my web page http://www.ucolick.org/~sla/leapsecs/onlinebib.html As currently worded the draft revision would abandon leap seconds in the UTC time scale. Adoption of the draft revision requires a 70% supermajority vote of the delegates. In 1970 (the previous instance of significant change to broadcast time signals) the wording of the draft was modified during the assembly. I would like feedback from the members of the tz mail list on the pros and cons of the applicability of a possible modification of the broadcast time signals which preserves the traditional meaning of time-of-day while removing the leap seconds from the broadcasts. The modification uses the existing zoneinfo database and code. I have a description and test example of the modification here http://www.ucolick.org/~sla/leapsecs/right+gps.html This is aimed as an implementation which can be tested now. If the ITU-R were to rename the broadcast time scale at the same time as abandoning leap seconds then it might also serve posterity. -- Steve Allen <sla(a)ucolick.org> WGS-84 (GPS) UCO/Lick Observatory--ISB Natural Sciences II, Room 165 Lat +36.99855 1156 High Street Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m

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IERS Message No. 192: Questionnaire to survey opinion concerning a redefinition of UTC
by central_bureau＠iers.org July 12, 2011

July 12, 2011

************************************************************************ IERS Message No. 192 July 12, 2011 ************************************************************************ Questionnaire to survey opinion concerning a redefinition of UTC After years of discussions, a proposal to fundamentally redefine UTC will come to a conclusive vote in January 2012 at the ITU-R in Geneva. This proposal would halt the intercalary adjustments known as leap seconds that maintain UTC as a form of Universal Time. If the proposal is approved, UTC would not keep pace with Earth rotation and the value of DUT1 would become unconstrained. Therefore UTC would no longer be directly useful for various technical applications which rely on it being less than 1 second from UT1. Such applications would require a separate access to UT1, such as through the publication of DUT1 by other means. The objective of the survey is to find out the strength of opinion for maintaining or changing the present system. Link to the questionnaire: http://hpiers.obspm.fr/eop-pc/index.php?index=questionnaire Your response is appreciated before 31 August 2011. Daniel Gambis Earth Orientation Center of the IERS ************************************************************************ IERS Messages are edited and distributed by the IERS Central Bureau. To submit texts for distribution and to subscribe or unsubscribe, please write to <central_bureau(a)iers.org>. Archives: http://www.iers.org/Messages/ ************************************************************************

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Re: DST in Fiji
by Petr Machata July 8, 2011

July 8, 2011

Hi there, I'm wondering if anyone knows whether Fiji should enter the period of DST in 2011 again, and when that should be. Timeanddate.com seem to expect it starts at years to come. But the only reference I was able to find is this one: http://www.fiji.gov.fj/index.php?option=com_content&view=article&id=2608:da… And that seems only related to the DST period that occured in 2010/2011. In particular, in the following line: "Daylight Savings will be from October 24 to March 6, 2011" ... I don't think that "October 24" should be understod as October of 2011. (The zoneinfo project doesn't currenty assume the DST will start in 2011 an on.) Thanks, Petr Machata

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Bulletin C number 42
by IERS EOP Product Center July 8, 2011

July 8, 2011

INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS) SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE SERVICE DE LA ROTATION TERRESTRE OBSERVATOIRE DE PARIS 61, Av. de l'Observatoire 75014 PARIS (France) Tel. : 33 (0) 1 40 51 22 26 FAX : 33 (0) 1 40 51 22 91 Internet : services.iers(a)obspm.fr Paris, 8 July 2011 Bulletin C 42 To authorities responsible for the measurement and distribution of time INFORMATION ON UTC - TAI NO positive leap second will be introduced at the end of December 2011. The difference between Coordinated Universal Time UTC and the International Atomic Time TAI is : from 2009 January 1, 0h UTC, until further notice : UTC-TAI = -34 s Leap seconds can be introduced in UTC at the end of the months of December or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every six months, either to announce a time step in UTC, or to confirm that there will be no time step at the next possible date. Daniel GAMBIS Director Earth Orientation Center of IERS Observatoire de Paris, France IMPORTANT: After years of discussions, a proposal to fundamentally redefine UTC will come to a conclusive vote in January 2012 at the ITU-R in Geneva. This proposal would halt the intercalary adjustments known as leap seconds that maintain UTC as a form of Universal Time. The Earth Orientation Center of the IERS organizes a survey online with the objective to find out the strength of opinion for maintaining or changing the present system. Link to the questionnaire: http://hpiers.obspm.fr/eop-pc/index.php?index=questionnaire Your response is appreciated before 30 August 2011 __________________________________________

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TAI zone?
by David Magda July 5, 2011

July 5, 2011

[Not a subscriber, so please CC.] Hello, There's been some discussion of removing leap seconds from UTC, as some people need/want a more predictable and deterministic time scale. [1] Given that International Atomic Time [2] exists, there doesn't seem to be an easy way to reference it. Is there any reason why a TAI "time zone" ("TZ=TAI; export TZ") is not present for those that want to ignore leap seconds? I noticed that some Linux distributions have a "right/" directory [3] to deal with this in some way: > Two different versions are provided: > - The "posix" version is based on the Coordinated Universal Time (UTC). > - The "right" version is based on the International Atomic Time (TAI), > and it includes the leap seconds. [...] > > - TZDIR=/usr/share/zoneinfo/posix TZ=Europe/Paris on a system with > hardware clock set to UTC. > - TZDIR=/usr/share/zoneinfo/right TZ=Europe/Paris on a system with > hardware clock set to TAI. Regards, David [1] http://cacm.acm.org/magazines/2011/5/107699-the-one-second-war/fulltext [2] http://en.wikipedia.org/wiki/International_Atomic_Time [3] /usr/share/doc/tzdata/README.Debian

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Israel extends Daylight Savings Time
by Alexander Krivenyshev July 4, 2011

July 4, 2011

According to the Israel Prime Minister's Office (pmo.gov.il), Cabinet Approves draft legislation to extend Daylight Savings Time to an average of 193 days, as opposed to 182 today. Cabinet Approves Extension of Daylight Savings Time http://www.pmo.gov.il/PMOEng/Communication/Spokesman/2011/07/spokeclock0307… m or http://www.worldtimezone.com/dst_news/dst_news_israel03.html Alexander Krivenyshev http://www.worldtimezone.com

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[OT] Fwd: Why the name in America/Guayaquil?
by José Miguel Parrella Romero July 1, 2011

July 1, 2011

I'm forwarding this query to the list, and will greatly appreciate any comments. Thanks!

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Cairo TZ Environment Variable
by 雍義 July 1, 2011

July 1, 2011

Hello, I've just compiled tzdata2011h.tar.gz and found Cairo's TZ environment variable is empty. So I checked http://en.wikipedia.org/wiki/Egypt and use "EET-2". But I've never been to Cairo so I'm not absolute sure whether people there use that. Just FYI. Regards, Richard

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