June 2011 - tz - lists.iana.org

TAI zone?
by David Magda 05 Jul '11

05 Jul '11

[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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IERS Message No. 191: Colloquium on redefinition of UTC - Announcement
by central_bureau＠iers.org 28 Jun '11

28 Jun '11

************************************************************************ IERS Message No. 191 June 28, 2011 ************************************************************************ Colloquium on redefinition of UTC - Announcement Decoupling Civil Timekeeping from Earth Rotation A Colloquium Exploring Implications of Redefining UTC in Astrodynamics, Astronomy, Geodesy, Navigation, Remote Sensing and Related Fields October 5-6, 2011 Headquarters of Analytical Graphics, Inc. 220 Valley Creek Blvd, Exton PA, 19341-2380 (near Philadelphia) Registration is now open at http://futureofutc.org Universal Time - the conventional measure of Earth rotation and astronomical time-of-day - is the traditional basis for civil timekeeping. Clocks worldwide are synchronized via Coordinated Universal Time (UTC), an atomic time scale recommended by the Radiocommunications Sector of the International Telecommunications Union (ITU-R). A proposal to fundamentally redefine UTC will come to a conclusive vote in January 2012 at the Radiocommunications Assembly of the ITU-R in Geneva. It would halt the intercalary adjustments known as leap seconds that maintain UTC as a form of Universal Time, and eliminate the requirement that time services transmit the varying residuals (DUT1) between Coordinated Universal Time and Universal Time of day. If the proposal is approved, UTC would not keep pace with Earth rotation and the value of DUT1 would become unconstrained. Adverse impacts from redefining UTC have not been extensively researched and documented. The implications extend from technical infrastructure to legal, historical, logistical, sociological and economic domains. Affected technologies may include (but are not limited to) applications in astronomy, astrodynamics and celestial mechanics, geodesy, ground-to-space satellite communications, navigation, remote sensing and space surveillance. This meeting will provide a venue for discussing and documenting the repercussions of changing UTC along with possible mitigation strategies. Co-chairs: Rob Seaman, National Optical Astronomy Observatory John Seago, Analytical Graphics, Inc. Steve Allen, University of California Observatories / Lick Observatory ************************************************************************ 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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Lack of zone Asia/Beijing and other major cites in China
by An Yang 27 Jun '11

27 Jun '11

Hi Arthur, Beijing is the capital of People's Republic of China from 1949, and Beijing Time is used in whole PRC according to China law by now. It's a good news for the people who live in China, if they could see Beijing and other major cites in China. If it's possible, I'm glad to contribute. Bests, An Yang

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lack of zone Asia/Beijing
by An Yang 27 Jun '11

27 Jun '11

Hi Arthur, Beijing is the capital of People's Republic of China from 1949, and Beijing Time is used in whole PRC according to China law. Do you mind to add Beijing time zone? Bests, An Yang

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Europe/Kaliningrad in 2011h
by yoshito_umaoka＠us.ibm.com 27 Jun '11

27 Jun '11

In 2011h, the GMT offset of Europe/Kaliningrad was changed from 2:00 to 3:00 by the new Russian law. Zone Europe/Kaliningrad 1:22:00 - LMT 1893 Apr 1:00 C-Eur CE%sT 1945 2:00 Poland CE%sT 1946 3:00 Russia MSK/MSD 1991 Mar 31 2:00s 2:00 Russia EE%sT 2011 Mar 27 2:00s 3:00 - EET The format - "EET" is used above, which is now different from other "EET" (generated from "EE%sT") used by Eastern European zones. For example, "10:00 EET" in Europe/Bucharest after the daylight-standard transition in this fall is actually "11:00 EET" in Europe/Kaliningrad. I think this is confusing and should use more distinctive format. -Yoshito

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Mid-Atlantic time zone with DST support
by Isaac Lau 21 Jun '11

21 Jun '11

Hi, I am wondering if Olsen database supports the above with the following specifics: If it does, please let me know which zone I should use. Note that in Microsoft XP and Windows 7, it contains a Mid-Atlantic time zone which observes DST. Thanks *Isaac # Atlantic Ocean or Mid Atlantic rules # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule MidAT 1980 max - Mar lastSun 2:00 1:00 - Rule MidAT 1980 max - Sep lastSun 2:00 0 - # Atlantic Ocean or Mid Atlantic # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Atlantic/Atlantic_Ocean -2:26:08 - LMT 1890 # -2:00 - GST 1980 # South Georgia Time -2:00 MidAT GST

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Re: proposed time zone package changes (Russia, Curacao)
by Arthur David Olson 17 Jun '11

17 Jun '11

> In respect to the the dissolution of AN (Netherlands Antilles), you are > replacing its record with CW Curacao; but shouldn't a record also be > added for the other country formed by the dissolution, namely > Sint-Maarten (SX)? Below are revised changes to get in sync with the current ISO3166 data; these changes are relative to the stuff on the ftp site. --ado diff -r old/iso3166.tab new/iso3166.tab 2c2 < # @(#)iso3166.tab 8.6 --- > # @(#)iso3166.tab 8.9 23a24,27 > # From Arthur David Olson (2011-06-15): > # Resynchronized today with the ISO3116 site > # (deleting AN and adding BQ, CW, and SX). > # 33d36 < AN Netherlands Antilles 55a59 > BQ Bonaire Sint Eustatius & Saba 77a82 > CW Curacao 233a239 > SX Sint Maarten diff -r old/southamerica new/southamerica 2c2 < # @(#)southamerica 8.49 --- > # @(#)southamerica 8.50 1278a1279,1286 > # From Arthur David Olson (2011-06-15): > # At least for now, use links for places with new iso3166 codes. > # The name "Lower Prince's Quarter" is both longer than fourteen charaters > # and contains an apostrophe; use "Lower_Princes" below. > > Link America/Curacao America/Lower_Princes # Sint Maarten > Link America/Curacao America/Kralendijk # Bonaire, Sint Estatius and Saba > diff -r old/zone.tab new/zone.tab 2c2 < # @(#)zone.tab 8.43 --- > # @(#)zone.tab 8.45 35d34 < AN +1211-06900 America/Curacao 89a89 > BQ +120903-0681636 America/Kralendijk 157a158 > CW +1211-06900 America/Curacao 364a366 > SX +180305-0630250 America/Lower_Princes

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DST in America/Metlakatla?
by Bill Seymour 17 Jun '11

17 Jun '11

I apologize if this is old news that somehow blew by me. I don't think the zone America/Metlakatla in northamerica is quite right yet. I think the rule in the last line of the zone should be "-", not "US". I'm guessing that that was just a typo. FWIW, I've confirmed independently that Metlakatla observes UTC-8 year-round. My day job is with the U.S. Postal Service, and I work on a system that schedules transportation, so time zones are important to me. Confused by the "US" in America/Metlakatla, I called the 99926 post office; and the woman I spoke to said, "Right now, we're the same time as the rest of Alaska. Fall/winter, we're the same as Seattle." --Bill Seymour "If this were my employer's opinion, I wouldn't be allowed to post it." -- Norman Diamond

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proposed time zone package changes (Russia, Curacao)
by Arthur David Olson 15 Jun '11

15 Jun '11

Below find proposed priority changes to the time zone package; the executive summary: antarctica Remove unused "RussAQ" rules. asia Add comment on retaining "old" Russia rules for the benefit of Armenia europe Russia abandons DST in 2011 (thanks to Alexander Krivenyshev) ("old" Russia rules retained for now for Belarus) iso3166.tab Change AN (Netherlands Antilles) to CW (Curacao) zone.tab Change AN (Netherlands Antilles) to CW (Curacao) If no problems are found and nothing goes wrong, these changes are to appear on the ftp site on 2011-06-27. Now that the Russian changes are official, we'll see what Armenia and Belarus do. --ado diff -r old/antarctica new/antarctica 2c2 < # @(#)antarctica 8.8 --- > # @(#)antarctica 8.9 22,33d21 < # These rules are stolen from the `europe' file. < # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S < Rule RussAQ 1981 1984 - Apr 1 0:00 1:00 S < Rule RussAQ 1981 1983 - Oct 1 0:00 0 - < Rule RussAQ 1984 1991 - Sep lastSun 2:00s 0 - < Rule RussAQ 1985 1991 - Mar lastSun 2:00s 1:00 S < Rule RussAQ 1992 only - Mar lastSat 23:00 1:00 S < Rule RussAQ 1992 only - Sep lastSat 23:00 0 - < Rule RussAQ 1993 max - Mar lastSun 2:00s 1:00 S < Rule RussAQ 1993 1995 - Sep lastSun 2:00s 0 - < Rule RussAQ 1996 max - Oct lastSun 2:00s 0 - < diff -r old/asia new/asia 1c1 < # @(#)asia 8.64 --- > # @(#)asia 8.65 79a80,83 > # From Arthur David Olson (2011-06-15): > # While Russia abandoned DST in 2011, Armenia may choose to > # follow Russia's "old" rules. > diff -r old/europe new/europe 2c2 < # @(#)europe 8.32 --- > # @(#)europe 8.33 567a568,587 > # From Alexander Krivenyshev (2011-06-14): > # According to Kremlin press service, Russian President Dmitry Medvedev > # signed a federal law "On calculation of time" on June 9, 2011. > # According to the law Russia is abolishing daylight saving time. > # > # Medvedev signed a law "On the Calculation of Time" (in russian): > # <a href="http://bmockbe.ru/events/?ID=7583"> > # http://bmockbe.ru/events/?ID=7583 > # </a> > # > # Medvedev signed a law on the calculation of the time (in russian): > # <a href="http://www.regnum.ru/news/polit/1413906.html"> > # http://www.regnum.ru/news/polit/1413906.html > # </a> > > # From Arthur David Olson (2011-06-15): > # Take "abolishing daylight saving time" to mean that time is now considered > # to be standard. > # At least for now, keep the "old" Russia rules for the benefit of Belarus. > 2016c2036,2037 < 2:00 Russia EE%sT --- > 2:00 Russia EE%sT 2011 Mar 27 2:00s > 3:00 - EET 2045c2066,2067 < 3:00 Russia MSK/MSD --- > 3:00 Russia MSK/MSD 2011 Mar 27 2:00s > 4:00 - MSK 2058c2080,2081 < 3:00 Russia VOL%sT --- > 3:00 Russia VOL%sT 2011 Mar 27 2:00s > 4:00 - VOLT 2070c2093,2094 < 3:00 Russia SAM%sT --- > 3:00 Russia SAM%sT 2011 Mar 27 2:00s > 4:00 - SAMT 2083c2107,2108 < 5:00 Russia YEK%sT # Yekaterinburg Time --- > 5:00 Russia YEK%sT 2011 Mar 27 2:00s > 6:00 - YEKT # Yekaterinburg Time 2091c2116,2117 < 6:00 Russia OMS%sT --- > 6:00 Russia OMS%sT 2011 Mar 27 2:00s > 7:00 - OMST 2101c2127,2128 < 6:00 Russia NOV%sT --- > 6:00 Russia NOV%sT 2011 Mar 27 2:00s > 7:00 - NOVT 2134c2161,2162 < 6:00 Russia NOV%sT # Novosibirsk/Novokuznetsk Time --- > 6:00 Russia NOV%sT 2011 Mar 27 2:00s > 7:00 - NOVT # Novosibirsk/Novokuznetsk Time 2145c2173,2174 < 7:00 Russia KRA%sT --- > 7:00 Russia KRA%sT 2011 Mar 27 2:00s > 8:00 - KRAT 2155c2184,2185 < 8:00 Russia IRK%sT --- > 8:00 Russia IRK%sT 2011 Mar 27 2:00s > 9:00 - IRKT 2178c2208,2209 < 9:00 Russia YAK%sT --- > 9:00 Russia YAK%sT 2011 Mar 27 2:00s > 10:00 - YAKT 2191c2222,2223 < 10:00 Russia VLA%sT --- > 10:00 Russia VLA%sT 2011 Mar 27 2:00s > 11:00 - VLAT 2201c2233,2234 < 10:00 Russia SAK%sT --- > 10:00 Russia SAK%sT 2011 Mar 27 2:00s > 11:00 - SAKT 2214c2247,2248 < 11:00 Russia MAG%sT --- > 11:00 Russia MAG%sT 2011 Mar 27 2:00s > 12:00 - MAGT 2225c2259,2260 < 11:00 Russia PET%sT --- > 11:00 Russia PET%sT 2011 Mar 27 2:00s > 12:00 - PETT 2234c2269,2270 < 11:00 Russia ANA%sT --- > 11:00 Russia ANA%sT 2011 Mar 27 2:00s > 12:00 - ANAT diff -r old/iso3166.tab new/iso3166.tab 2c2 < # @(#)iso3166.tab 8.6 --- > # @(#)iso3166.tab 8.7 33d32 < AN Netherlands Antilles 77a77 > CW Curacao diff -r old/zone.tab new/zone.tab 2c2 < # @(#)zone.tab 8.43 --- > # @(#)zone.tab 8.44 35d34 < AN +1211-06900 America/Curacao 157a157 > CW +1211-06900 America/Curacao

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Cayman Islands are considering to implement DST
by Alexander Krivenyshev 14 Jun '11

14 Jun '11

The Cayman Islands are considering to implement DST to sinc. time with New York year around. "Premier McKeeva Bush announced the upcoming study of a switch to Daylight Saving Time in the Cayman Islands during his budget address Friday. " Committee to study time change- Daylight Saving Time to be considered http://www.compasscayman.com/caycompass/2011/06/14/Committee-to-study-time- change/ or http://www.worldtimezone.com/dst_news/dst_news_cayman-islands01.html Alexander Krivenyshev, http://www.worldtimezone.com

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