- tz - lists.iana.org

[PROPOSED PATCH 1/2] Support -Dtime_tz=time_t
by Paul Eggert March 11, 2015

March 11, 2015

* private.h (tz_time_t), NEWS: Move typedef earlier. (Problem reported by Bradley White.) --- NEWS | 2 ++ private.h | 4 ++-- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/NEWS b/NEWS index 1e74bfd..89b5349 100644 --- a/NEWS +++ b/NEWS @@ -34,6 +34,8 @@ Unreleased, experimental changes Fix integer overflow bug in reference 'mktime' implementation. (Problem reported by Jörg Richter.) + Allow -Dtime_tz=time_t compilations. (Problem reported by Bradley White.) + Changes affecting commentary Cite the recent Mexican decree changing Quintana Roo's time zone. diff --git a/private.h b/private.h index efa1bdf..b9429ae 100644 --- a/private.h +++ b/private.h @@ -308,6 +308,8 @@ typedef unsigned long uintmax_t; static time_t sys_time(time_t *x) { return time(x); } # endif +typedef time_tz tz_time_t; + # undef ctime # define ctime tz_ctime # undef ctime_r @@ -341,8 +343,6 @@ static time_t sys_time(time_t *x) { return time(x); } # undef timeoff # define timeoff tz_timeoff -typedef time_tz time_t; - char *ctime(time_t const *); char *ctime_r(time_t const *, char *); double difftime(time_t, time_t); -- 2.1.0

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signed overflow
by Richter, Jörg March 10, 2015

March 10, 2015

In time2sub() there is this code: } else { lo = 1; for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i) lo *= 2; hi = -(lo + 1); } The last *= 2 will overflow a signed integer time_t. This can be fixed with “lo = -1” instead of “lo = 1”. This change seems to be consistent with the variable names. - Jörg

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[PROPOSED PATCH] Mongolia resumes DST in 2015
by Paul Eggert March 10, 2015

March 10, 2015

* asia (Mongol), NEWS: Mongolia will start observing DST again this year, from the last Saturday in March at 02:00 to the last Saturday in September at 00:00. (Thanks to Ganbold Tsagaankhuu.) --- NEWS | 4 ++++ asia | 9 +++++++++ 2 files changed, 13 insertions(+) diff --git a/NEWS b/NEWS index d21c1fa..5aca1f6 100644 --- a/NEWS +++ b/NEWS @@ -4,6 +4,10 @@ Unreleased, experimental changes Changes affecting future time stamps + Mongolia will start observing DST again this year, from the last + Saturday in March at 02:00 to the last Saturday in September at 00:00. + (Thanks to Ganbold Tsagaankhuu.) + Palestine will start DST on March 28, not March 27. Also, correct the fall 2014 transition from September 26 to October 24. Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) diff --git a/asia b/asia index fa7978e..756e3d0 100644 --- a/asia +++ b/asia @@ -1904,6 +1904,13 @@ Zone Indian/Maldives 4:54:00 - LMT 1880 # Male # was at the start of 2008-03-31 (the day of Steffen Thorsen's report); # this is almost surely wrong. +# From Ganbold Tsagaankhuu (2015-03-10): +# It seems like yesterday Mongolian Government meeting has concluded to use +# daylight saving time in Mongolia.... Starting at 2:00AM of last Saturday of +# March 2015, daylight saving time starts. And 00:00AM of last Saturday of +# September daylight saving time ends. Source: +# http://zasag.mn/news/view/8969 + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Mongol 1983 1984 - Apr 1 0:00 1:00 S Rule Mongol 1983 only - Oct 1 0:00 0 - @@ -1924,6 +1931,8 @@ Rule Mongol 1984 1998 - Sep lastSun 0:00 0 - 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 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] # Hovd, a.k.a. Chovd, Dund-Us, Dzhargalant, Khovd, Jirgalanta -- 2.1.0

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Daylight Saving Time, the movie
by Steve Jones March 10, 2015

March 10, 2015

Folks: It's pretty rare that humor is on-topic in this list, but I doubt anyone would disagree this is a clear exception, especially given the timing: https://www.youtube.com/watch?v=k4EUTMPuvHo Regards, Steve Jones []

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The Pi Day of the century
by Even Scharning March 7, 2015

March 7, 2015

The Pi Day of the century is only a few days away! One day every century, the numbers of the current month, day, year, hour, minute and second line up to match the first 10 digits of the mathematical constant pi: 3.14.15 9:26:53. We made a special clock for Pi Day, with date and time in "pi format". Please take a minute to check it out! http://time.is/pi_day Any feedback is appreciated. Even Scharning Time.is - exact time for any place on Earth http://time.is/

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historic Oslo times
by Meno Hochschild March 6, 2015

March 6, 2015

Recently I noticed following strange detail of Europe/Oslo during the years 1940-1942: The site http://www.timeanddate.com/time/zone/norway/oslo reports for these years that Oslo kept summer time between 1940-08-10 23:00 and 1942-11-02 03:00. But I cannot find a way in tz-data how to construct it. Maybe I have overlooked something. Rule Norway 1916 only - May 22 1:00 1:00 S Rule Norway 1916 only - Sep 30 0:00 0 - Rule Norway 1945 only - Apr 2 2:00s 1:00 S Rule Norway 1945 only - Oct 1 2:00s 0 - Rule Norway 1959 1964 - Mar Sun>=15 2:00s 1:00 S Rule Norway 1959 1965 - Sep Sun>=15 2:00s 0 - Rule Norway 1965 only - Apr 25 2:00s 1:00 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Europe/Oslo 0:43:00 - LMT 1895 Jan 1 1:00 Norway CE%sT 1940 Aug 10 23:00 1:00 C-Eur CE%sT 1945 Apr 2 2:00 1:00 Norway CE%sT 1980 1:00 EU CE%sT The Norway-rules do not catch the year 1940, so cannot indicate any summer time until 1940-08-10. Then the C-Eur-rule takes effect but see here: Rule C-Eur 1940 only - Apr 1 2:00s 1:00 S Rule C-Eur 1942 only - Nov 2 2:00s 0 - The rule for 1940 cannot be applied because 1st of Apr is clearly before the UNTIL-date of zone line in question when changing from Norway-rule to C-Eur-rule. I assume we are missing an extra Norway-rule for 1940 only changing to summer time on 1940-08-10 and have then to shift the UNTIL-date in second ZONE line a little bit (for example to 1941). Thanks in advance for any help Meno Hochschild

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Correct timezone for the country of India
by Sujay Phadke March 6, 2015

March 6, 2015

Hello, I was browsing through the tz database and I don't see a single city in the country of India for the timezone setting. Would you enlighten me as to why it is so? I am specifically looking at this: http://en.wikipedia.org/wiki/List_of_tz_database_time_zones Could you please add "New Delhi" or "Mumbai" to the +5:30 UTC timezone list? Secondly, what is this "Indian/<island names> ? This is some old relic information that needs to be updated. None of those island have anything to do with India, so why keep the naming convention? I did go through one discussion in your achives: http://mm.icann.org/pipermail/tz/2012-December/018488.html, but I couldn't see any reason why Mumbai or New Delhi cannot be added. I also could not find Asia/Calcutta in the list on current tz database. If I'm reading this wrong, please point me to the correct link. Thank you. Regards, Sujay

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Apparent Inconsistency in Russia Data
by Hank W. March 6, 2015

March 6, 2015

I noticed an apparent inconsistency among the Russia data in the Europe data file. Regarding the following line under Europe/Volgograd: 3:00 Russia MSK 2011 Mar 27 2:00s should it not be... 3:00 Russia MSK/MSD 2011 Mar 27 2:00s ? Hank W. of Austin, Texas, U.S.A.

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Palestine DST postponed by a day
by Steffen Thorsen March 5, 2015

March 5, 2015

Sources such as http://www.alquds.com/news/article/view/id/548257 and http://www.raya.ps/ar/news/890705.html say Palestine areas will start DST on 2015-03-28 00:00 which is one day later than expected. Our wrap-up: http://www.timeanddate.com/news/time/palestine-starts-dst-2015.html As a side note, some sources report that Kuwait may introduce DST. According to media reports like http://www.kuna.net.kw/ArticleDetails.aspx?id=2421216&Language=ar the authorities are considering advancing clocks by 2 hours every year. Best regards, Steffen Thorsen - timeanddate.com

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Paraguay change DST 22/03/2015
by Juan Carlos YJ. Lin March 4, 2015

March 4, 2015

Attending to Act 1.264, Paraguay change 4th sunday de March the DST, delay 1:00 hs Juan Carlos Lin Unisoft S.A. +595-993-288330 --------------------------------------------------- "Antes de imprimir, recuC)rdese de su compromiso con el Medio Ambiente" "Aviso: Este mensaje es dirigido para su destinatario y contiene informaciones que no pueden ser usadas por otras personas que no sean su(s) destinatario(s). La retransmisiC3n del contenido no estC! autorizada fuera del contexto de su envC-o y a quien corresponde. El uso no autorizado de la informaciC3n en este mensaje se halla penado por las leyes vigentes en todo el mundo. Si ha recibido este mensaje por error, por favor bC3rrala y notifique al remitente en la brevedad posible. El contenido de este mensaje no es responsabilidad de la Empresa y debe ser atribuido siempre a su autor. Gracias."

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Idaho House Bill 198 proposing Year-Round DST "Won't Go Forward"
by Ray at the Time Zone Report March 3, 2015

March 3, 2015

See chronology and details here: http://timezonereport.com/?cat=9 Ray ----- Ray Harwood Time Zone Report, a service of GoodClix, Inc. in the interest of public health <http://www.TimeZoneReport.com> http://www.TimeZoneReport.com and Twitter: @TimeZoneReport Office: (480) 378-3221 - Email: Ray(a)TimeZoneReport.com

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[PATCH] * NEWS, Theory: Update info about Mars time, citing Chmielewski.
by Paul Eggert March 3, 2015

March 3, 2015

--- NEWS | 2 ++ Theory | 10 +++++++--- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/NEWS b/NEWS index dfda622..b6a306f 100644 --- a/NEWS +++ b/NEWS @@ -19,6 +19,8 @@ Unreleased, experimental changes Cite the recent Mexican decree changing Quintana Roo's time zone. (Thanks to Carlos Raúl Perasso.) + Update info about Mars time. + Release 2015a - 2015-01-29 22:35:20 -0800 diff --git a/Theory b/Theory index e9be715..9861a4f 100644 --- a/Theory +++ b/Theory @@ -717,9 +717,11 @@ Mittelalters und der Neuzeit_, herausgegeben von Dr. O. Grotefend ----- Time and time zones on Mars ----- -Some people have adjusted their work schedules to fit Mars time. -Dozens of special Mars watches were built for Jet Propulsion -Laboratory workers who kept Mars time during the Mars Exploration +Some people's work schedules use Mars time. Jet Propulsion Laboratory +(JPL) coordinators have kept Mars time on and off at least since 1997 +for the Mars Pathfinder mission. Some of their family members have +also adapted to Mars time. Dozens of special Mars watches were built +for JPL workers who kept Mars time during the Mars Exploration Rovers mission (2004). These timepieces look like normal Seikos and Citizens but use Mars seconds rather than terrestrial seconds. @@ -760,6 +762,8 @@ Jia-Rui Chong, "Workdays Fit for a Martian", Los Angeles Times <http://articles.latimes.com/2004/jan/14/science/sci-marstime14> (2004-01-14), pp A1, A20-A21. +Tom Chmielewski, "Jet Lag Is Worse on Mars", The Atlantic (2015-02-26) +<http://www.theatlantic.com/technology/archive/2015/02/jet-lag-is-worse-on-m…> ----- Local Variables: -- 2.1.0

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Re: [tz] Chilean time change
by Yonathan Dossow March 3, 2015

March 3, 2015

It has been published now in "Diario Oficial", and it is an extension of CLST and EASST for two years, until March 25 2017. extracts from "diario oficial": Establécese que el adelanto de la hora oficial de Chile Continental dispuesto en el Decreto Supremo N°1.489, de 1970, del Ministerio del Interior, se extenderá hasta las 24 horas del sábado 25 de marzo de 2017. Establécese que el adelanto de la hora oficial de Chile Insular Occidental dispuesto en el Decreto Supremo N°1.142, de 1980, modificado por el Decreto Supremo N°61, de 1982, ambos del Ministerio del Interior, se extenderá hasta las 24 horas del sábado 25 de marzo de 2017. ----- Original Message ----- > From: "Glenn Eychaner" <geychaner(a)me.com> > To: "tz" <tz(a)iana.org> > Sent: Tuesday, 24 February, 2015 09:13:25 > Subject: Re: [tz] Chilean time change > As far as I know, an official announcement of the adoption of a new time > change rule would have to appear in: > http://www.diariooficial.interior.gob.cl > and would also appear in: > http://www.horaoficial.cl/cambio_hora.html > I have been monitoring both on a daily basis, and thus far have seen nothing. > So for now it's unclear to me whether this is a proposal or an announcement. > > -G. > > On Feb 24, 2015, at 9:00 AM, tz-request(a)iana.org wrote: > >> http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-mod… >> I[s] this the announcement of the proposal or the announcement of the adoption >> of the proposal? > > -- > Glenn Eychaner (geychaner(a)lco.cl) > Telescope Systems Programmer, Las Campanas Observatory -- Yonathan Dossow Fono: +56 32 2654367 Unidad de Infraestructura y Tecnologia Departamento de Informatica Universidad Tecnica Federico Santa Maria Valparaiso, Chile

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Re: [tz] Chilean time change
by Glenn Eychaner Feb. 24, 2015

Feb. 24, 2015

As far as I know, an official announcement of the adoption of a new time change rule would have to appear in: http://www.diariooficial.interior.gob.cl and would also appear in: http://www.horaoficial.cl/cambio_hora.html I have been monitoring both on a daily basis, and thus far have seen nothing. So for now it's unclear to me whether this is a proposal or an announcement. -G. On Feb 24, 2015, at 9:00 AM, tz-request(a)iana.org wrote: > http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-mod… > I[s] this the announcement of the proposal or the announcement of the adoption of the proposal? -- Glenn Eychaner (geychaner(a)lco.cl) Telescope Systems Programmer, Las Campanas Observatory

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Chilean time change
by Glenn Eychaner Feb. 23, 2015

Feb. 23, 2015

I have been following Diario Official for the past couple of weeks (http://www.diariooficial.interior.gob.cl) and have yet to see an official announcement regarding the change of time zone rules. In addition, SHOA has yet to update their web site (http://www.horaoficial.cl/cambio_hora.html) -G. -- Glenn Eychaner (geychaner(a)lco.cl) Telescope Systems Programmer, Las Campanas Observatory

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An outline of a possible solution for sensible leap-second support.
by random832＠fastmail.us Feb. 16, 2015

Feb. 16, 2015

Right now, very few people use the leap second support in tzcode. This may represent a lack of demand, or it may be due to the fact that you cannot have both leap second support and POSIX compliance at the same time. Even when people do use it, it's often done in an incomplete and incorrect way (e.g. by specifying the "right" folder directly in the TZ variable). If the tz project intends to provide leap second support, I would argue that it should be in a form that people can actually use. Also, general question: is there any standard on how leap seconds are to be handled in timezones that have an offset that is not a multiple of one whole minute? What does tzcode do now? ---- Abandon entirely the time2posix/posix2time functions, the "right" directory, and the notion of a time_t representation where e.g. 2000-01-01T00:00:00Z is represented by a value of 946684822 rather than 946684800. Very few people use them, and many of those who do use them do so incorrectly even disregarding the issue of programs they may run that do not call the conversion functions when they should. Remove support for generating tzdata files with leap second data, and report an error if one is loaded. Create a non-ambiguous representation for leap-aware timestamps. My suggestion is a pair of {time_t time; int leap;}, with time being (for leap seconds) the POSIX timestamp for the preceding normal second, and leap=1 for s=60, leap=2 for s=61, etc. Define a function interface which leap-aware systems may use to return the correct time, with leap seconds and without any skew to attempt to compensate for them. Tzcode to contain a dummy version that returns {time, 0}. The value of the existing time() function around leap seconds (e.g. whether it reports 23:59:59 twice, 00:00:00 twice, or implements some form of skew over the course of the minute/hour/day) is implementation-defined. (Arguably this new interface should also return the best known correct time immediately rather than implementing skew in the case of NTP adjustments as well, since unlike time() it is not expected to be used by legacy programs as a pseudo-monotonic counter) Define a file format and location (e.g. zoneinfo/leapdb) to store a single copy of leap second information for use by the following functions. Define leap-aware interval-measurement (difftime) and interval-addition (+ and - operator) functions. For example, since there was a leap second in June 2012, difftime_l({1341100802, 0}, {1341100798, 0}) [2012-07-01T00:00:02Z minus 2012-06-30T23:59:58Z] is 5 rather than the conventional 4. This is in contrast to the current implementation which represents these times with different values that differ by 5, and implements difftime by simple subtraction. Define leap-aware versions of mktime_r, localtime_r, mktime_rz, localtime_rz, gmtime_r, timegm_r, which use the new representation where the normal ones use time_t. Expanded scope (not part of tzcode/tzdata itself) - provide recommendations of how to represent leap second times in filesystem structures, archive structures, struct stat, struct timespec, and to maintain backwards compatibility with existing ABIs which do not provide this information (extending the range of an existing sub-second field is worth considering in some cases, though 32-bit signed nanoseconds only have room for one additional second in this way.)

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leap second insertions
by Nathan Justus Feb. 16, 2015

Feb. 16, 2015

>One additional second is all one needs, no? Two leap seconds are never inserted adjacent to each other. So POSIX's 'struct timespec' suffices to >represent leap seconds, and there's no need for a new data type here, just new operations on the type. You could start by adding a new clock to >clock_gettime, a clock that respects leap seconds. There has never been more than one leap second added in any one instance, but as far as I know, nothing precludes adding more than one at any one time. But, I daresay there would be a really significant event that would cause it, such as an asteroid strike that affect the day :) Nathan

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The zoneinfo file system tree structure ?
by J William Piggott Feb. 13, 2015

Feb. 13, 2015

[please cc me, I am not subscribed] Hello, I have been working on Util-linux' hwclock and other GNU/Linux date-time issues. I have a couple of questions that I hope someone here can answer. The tz database file system tree was changed on May 25 1998, moving 'right' and 'posix' from subdirectories of zoneinfo to sibling directories. However GNU libc continued to use the old structure until it stopped including the data files on Mar 7 2012. Now some Linux distributions are still using the old subdirectory tree structure. Is there a reason that the old tree structure is still being used? Does it break something to have 'right' and 'posix' as sibling directories? I ask because the problems that were the catalyst for the change in 1998 are still happening. It seems to me like it was a good solution, but nobody used it. If I may ask one more favor, could you please review the information below which I have added to the hwclock man-page? I still need to include information about using TZDIR. Thank you very much, William POSIX vs 'RIGHT' A discussion on date-time configuration would be incomplete without addressing timezones, this is mostly well covered by tzset(3). One area that seems to have no documentation is the 'right' directory of the IANA Time Zone Database, aka tz, aka zoneinfo. There are two separate databases in the zoneinfo system, posix and 'right'. 'Right' (now named leaps) includes leap seconds and posix does not. To use the 'right' database the System Clock must be kept in UTC + leap_seconds, i.e., TAI - 10. This allows calculating the exact number of seconds between two dates that cross a leap second epoch. The System Clock is then converted to the correct civil time, including UTC, by using the 'right' timezone files which subtract the leap sec- onds. Note: this configuration is considered experimental and is known to have issues. To configure a system to use a particular database all of the files located in its directory must be copied to the root of /usr/share/zoneinfo. Files are never used directly from the posix or 'right' subdirectories, e.g., TZ='right/Europe/Dublin'. This habit was becoming so common that the upstream zoneinfo project restructured the system's file tree by moving the posix and 'right' subdirectories out of the zoneinfo directory and into sibling directories: /usr/share/zoneinfo /usr/share/posix /usr/share/leaps Unfortunately, some Linux distributions are changing it back to the old tree structure in their packages. So the problem of system administra- tors reaching into the 'right' subdirectory persists. This causes the system timezone to be configured to include leap seconds while the zoneinfo database is still configured to exclude them. Then when an application such as a World Clock needs the South_Pole timezone file; or an email MTA, or hwclock needs the UTC timezone file; they fetch it from the root of /usr/share/zoneinfo , because that is what they are supposed to do. Those files exclude leap seconds, but the System Clock now includes them, causing an incorrect time conversion. Attempting to mix and match files from these separate databases will not work, because they each require the System Clock to use a different timescale. The zoneinfo database must be configured to use either posix or 'right', as described above.

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[PROPOSED PATCH] * northamerica (America/Cayman): Put Link after Zone.
by Paul Eggert Feb. 13, 2015

Feb. 13, 2015

--- northamerica | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/northamerica b/northamerica index cb27bd5..77463da 100644 --- a/northamerica +++ b/northamerica @@ -2592,7 +2592,7 @@ Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton -4:00 US A%sT # Cayman Is -Link America/Panama America/Cayman +# See America/Panama. # Costa Rica @@ -3115,6 +3115,7 @@ Zone America/Managua -5:45:08 - LMT 1890 Zone America/Panama -5:18:08 - LMT 1890 -5:19:36 - CMT 1908 Apr 22 # Colón Mean Time -5:00 - EST +Link America/Panama America/Cayman # Puerto Rico # There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'. -- 2.1.0

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[PROPOSED PATCH] Move four out-of-scope zones to 'backzone'
by Paul Eggert Feb. 13, 2015

Feb. 13, 2015

* NEWS: Document this. * australasia (Pacific/Guam): Now a link to Pacific/Guam. (Pacific/Midway): Now a link to Pacific/Pago_Pago. * backzone (America/Antigua, America/Cayman, Pacific/Miday) (Pacific/Saipan): Move these four entries here from the other files. * checktab.awk: Remove special cases for the four zones. * northamerica (America/Cayman): Now a link to America/Panama. (America/Antigua): Move to ... * southamerica (America/Antigua): ... here, and make it a link to America/Port_of_Spain. --- NEWS | 9 +++++++++ australasia | 27 ++++----------------------- backzone | 36 ++++++++++++++++++++++++++++++++++++ checktab.awk | 9 --------- northamerica | 12 ++---------- southamerica | 1 + 6 files changed, 52 insertions(+), 42 deletions(-) diff --git a/NEWS b/NEWS index b70ce73..33e983f 100644 --- a/NEWS +++ b/NEWS @@ -2,6 +2,15 @@ News for the tz database Unreleased, experimental changes + Changes affecting past time stamps + + Some more zones have been turned into links, when they differed + from existing zones only for older time stamps. As usual, + these changes affect UTC offsets in pre-1970 time stamps only. + Their old contents have been moved to the 'backzone' file. + The affected zones are: America/Antigua, America/Cayman, + Pacific/Midway, and Pacific/Saipan. + Changes affecting commentary Cite the recent Mexican decree changing Quintana Roo's time zone. diff --git a/australasia b/australasia index 911e681..3e2c0b3 100644 --- a/australasia +++ b/australasia @@ -373,6 +373,7 @@ Zone Pacific/Guam -14:21:00 - LMT 1844 Dec 31 9:39:00 - LMT 1901 # Agana 10:00 - GST 2000 Dec 23 # Guam 10:00 - ChST # Chamorro Standard Time +Link Pacific/Guam Pacific/Saipan # N Mariana Is # Kiribati # Zone NAME GMTOFF RULES FORMAT [UNTIL] @@ -388,12 +389,7 @@ Zone Pacific/Kiritimati -10:29:20 - LMT 1901 14:00 - LINT # N Mariana Is -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone Pacific/Saipan -14:17:00 - LMT 1844 Dec 31 - 9:43:00 - LMT 1901 - 9:00 - MPT 1969 Oct # N Mariana Is Time - 10:00 - MPT 2000 Dec 23 - 10:00 - ChST # Chamorro Standard Time +# See Pacific/Guam. # Marshall Is # Zone NAME GMTOFF RULES FORMAT [UNTIL] @@ -563,6 +559,7 @@ Zone Pacific/Pago_Pago 12:37:12 - LMT 1879 Jul 5 -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 # Samoa (formerly and also known as Western Samoa) @@ -744,23 +741,7 @@ Zone Pacific/Funafuti 11:56:52 - LMT 1901 # uninhabited # Midway -# -# From Mark Brader (2005-01-23): -# [Fallacies and Fantasies of Air Transport History, by R.E.G. Davies, -# published 1994 by Paladwr Press, McLean, VA, USA; ISBN 0-9626483-5-3] -# reproduced a Pan American Airways timetable from 1936, for their weekly -# "Orient Express" flights between San Francisco and Manila, and connecting -# flights to Chicago and the US East Coast. As it uses some time zone -# designations that I've never seen before:.... -# Fri. 6:30A Lv. HONOLOLU (Pearl Harbor), H.I. H.L.T. Ar. 5:30P Sun. -# " 3:00P Ar. MIDWAY ISLAND . . . . . . . . . M.L.T. Lv. 6:00A " -# -Zone Pacific/Midway -11:49:28 - LMT 1901 - -11:00 - NST 1956 Jun 3 - -11:00 1:00 NDT 1956 Sep 2 - -11:00 - NST 1967 Apr # N=Nome - -11:00 - BST 1983 Nov 30 # B=Bering - -11:00 - SST # S=Samoa +# See Pacific/Pago_Pago. # Palmyra # uninhabited since World War II; was probably like Pacific/Kiritimati diff --git a/backzone b/backzone index fc20ea5..31a3f5a 100644 --- a/backzone +++ b/backzone @@ -255,6 +255,11 @@ Zone Africa/Timbuktu -0:12:04 - LMT 1912 Zone America/Anguilla -4:12:16 - LMT 1912 Mar 2 -4:00 - AST +# Antigua and Barbuda +Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 + -5:00 - EST 1951 + -4:00 - AST + # Chubut, Argentina # The name "Comodoro Rivadavia" exceeds the 14-byte POSIX limit. Zone America/Argentina/ComodRivadavia -4:30:00 - LMT 1894 Oct 31 @@ -274,6 +279,11 @@ Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad -4:30 - ANT 1965 # Netherlands Antilles Time -4:00 - AST +# Cayman Is +Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown + -5:07:11 - KMT 1912 Feb # Kingston Mean Time + -5:00 - EST + # Canada Zone America/Coral_Harbour -5:32:40 - LMT 1884 -5:00 NT_YK E%sT 1946 @@ -599,3 +609,29 @@ Zone Indian/Mayotte 3:00:56 - LMT 1911 Jul # Mamoutzou # US minor outlying islands Zone Pacific/Johnston -10:00 - HST + +# US minor outlying islands +# +# From Mark Brader (2005-01-23): +# [Fallacies and Fantasies of Air Transport History, by R.E.G. Davies, +# published 1994 by Paladwr Press, McLean, VA, USA; ISBN 0-9626483-5-3] +# reproduced a Pan American Airways timetable from 1936, for their weekly +# "Orient Express" flights between San Francisco and Manila, and connecting +# flights to Chicago and the US East Coast. As it uses some time zone +# designations that I've never seen before:.... +# Fri. 6:30A Lv. HONOLOLU (Pearl Harbor), H.I. H.L.T. Ar. 5:30P Sun. +# " 3:00P Ar. MIDWAY ISLAND . . . . . . . . . M.L.T. Lv. 6:00A " +# +Zone Pacific/Midway -11:49:28 - LMT 1901 + -11:00 - NST 1956 Jun 3 + -11:00 1:00 NDT 1956 Sep 2 + -11:00 - NST 1967 Apr # N=Nome + -11:00 - BST 1983 Nov 30 # B=Bering + -11:00 - SST # S=Samoa + +# N Mariana Is +Zone Pacific/Saipan -14:17:00 - LMT 1844 Dec 31 + 9:43:00 - LMT 1901 + 9:00 - MPT 1969 Oct # N Mariana Is Time + 10:00 - MPT 2000 Dec 23 + 10:00 - ChST # Chamorro Standard Time diff --git a/checktab.awk b/checktab.awk index 9a452b6..cf2c726 100644 --- a/checktab.awk +++ b/checktab.awk @@ -12,15 +12,6 @@ BEGIN { # A special (and we hope temporary) case. tztab["America/Montreal"] = 1 - # Some more special cases; these are zones that should probably - # be turned into links. - if (zone_table == "zone1970.tab") { - tztab["America/Antigua"] = 1 - tztab["America/Cayman"] = 1 - tztab["Pacific/Midway"] = 1 - tztab["Pacific/Saipan"] = 1 - } - while (getline <iso_table) { iso_NR++ if ($0 ~ /^#/) continue diff --git a/northamerica b/northamerica index ad7e106..cb27bd5 100644 --- a/northamerica +++ b/northamerica @@ -2524,13 +2524,8 @@ Zone America/Santa_Isabel -7:39:28 - LMT 1922 Jan 1 0:20:32 ############################################################################### # Anguilla -# See America/Port_of_Spain. - # Antigua and Barbuda -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Antigua -4:07:12 - LMT 1912 Mar 2 - -5:00 - EST 1951 - -4:00 - AST +# See America/Port_of_Spain. # Bahamas # @@ -2597,10 +2592,7 @@ Zone Atlantic/Bermuda -4:19:18 - LMT 1930 Jan 1 2:00 # Hamilton -4:00 US A%sT # Cayman Is -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown - -5:07:11 - KMT 1912 Feb # Kingston Mean Time - -5:00 - EST +Link America/Panama America/Cayman # Costa Rica diff --git a/southamerica b/southamerica index a64a438..fc0cc54 100644 --- a/southamerica +++ b/southamerica @@ -1604,6 +1604,7 @@ Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2 # These all agree with Trinidad and Tobago since 1970. Link America/Port_of_Spain America/Anguilla +Link America/Port_of_Spain America/Antigua Link America/Port_of_Spain America/Dominica Link America/Port_of_Spain America/Grenada Link America/Port_of_Spain America/Guadeloupe -- 2.1.0

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Brazil considering delay to end of DST
by Paul Eggert Feb. 12, 2015

Feb. 12, 2015

The government of Brazil is considering ending daylight saving time later than planned. Currently DST is scheduled to end February 22 at 00:00 local time. This may be delayed by a month. A decision is planned by February 12. Brazil is getting less rain than expected -- their January was the driest in 85 years -- and hydroelectric plants produce most of Brazil's electricity. The hope is that daylight saving time will lower power consumption peaks, making power blackouts less likely. Sources: Jelmayer R. Brazil evaluates extending daylight saving time. Dow Jones Business News 2015-02-06. http://www.nasdaq.com/article/brazil-evaluates-extending-daylight-saving-ti… Governo estuda estender o horário de verão para economizar energia. Jornal Nacional 2015-02-05. http://g1.globo.com/economia/noticia/2015/02/governo-estuda-estender-o-hora… Watts J. Brazil’s worst drought in history prompts protests and blackouts. The Guardian 2015-01-23. http://www.theguardian.com/world/2015/jan/23/brazil-worst-drought-history

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tz-latest checksum
by Paul G Feb. 7, 2015

Feb. 7, 2015

I'm looking into writing a python script which retrieves the latest timezone database from the FTP server, but I'm wondering if there's anywhere that a checksum of the tz-latest files can be found anywhere. At the moment, we manually specify the latest version of the database, and calculate the sha512 checksum whenever it is updated. I see that the GPG signature is available, but I would very much like to avoid adding any dependencies to the library. Is there anywhere that I retrieve the checksum for the latest tzdata file using one of the hashes supported by hashlib? (SHA1, SHA256, SHA384, SHA512 or MD5) Of course this defeats the implied MITM protection that retrieving a "known good" or signed checksum provides, but it at least retains the checksum / corrupted file protection. Thanks!

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Re: [tz] Positive leap second on 2015-06-30.
by Denis Excoffier Feb. 7, 2015

Feb. 7, 2015

On 2015-01-06 21:22, Tim Parenti wrote: > +# Some systems implement leap seconds by amortizing the leap second > +# over the last few minutes of the day. The frequency of the local > +# clock is decreased (or increased) to realize the positive (or > +# negative) leap second. This method removes the time step described > +# above. Although the long-term behavior of the time scale is correct > +# in this case, this method introduces an error during the adjustment > +# period both in time and in frequency with respect to the official > +# defintion of UTC. s/defintion/definition/ Regards, Denis Excoffier.

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Chilean time change
by Glenn Eychaner Feb. 7, 2015

Feb. 7, 2015

I have been following Diario Official for the past couple of weeks (http://www.diariooficial.interior.gob.cl) and have yet to see an official announcement regarding the change of time zone rules. In addition, SHOA has yet to update their web site (http://www.horaoficial.cl/cambio_hora.html) -G. -- Glenn Eychaner (geychaner(a)lco.cl) Telescope Systems Programmer, Las Campanas Observatory

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Re: [tz] Fwd: Quintana Roo change to EST?
by Matt Johnson Feb. 7, 2015

Feb. 7, 2015

The CENAM belongs to the Economic Secretary. My understanding is that this is the official department that would set the policy - similar to NIST in the US. ________________________________ From: Paul Eggert<mailto:eggert@cs.ucla.edu> Sent: ‎2/‎5/‎2015 4:29 PM To: Matt Johnson<mailto:mj1856@hotmail.com>; Time Zone Database<mailto:tz@iana.org> Subject: Re: [tz] Fwd: Quintana Roo change to EST? There were conflicting reports about this back when Mexico was considering doing the change in October of this year. As I understand it, Mexico decided to move the change up to this month, and to stay on EST all year. For a brief summary please see: http://www.timeanddate.com/news/time/mexico-quintana-roo-time-zone.html It could well be that this is wrong. There's at least one English-language source saying that it hasn't been decided whether Quintana Roo will observe DST: http://www.blogsouthwest.com/who-moved-my-queso-cancun-changes-time-zone/ and perhaps we'll need a further update once this becomes decided or sufficiently clear. That being said, my (admittedly limited) understanding of QRoo politics suggests that they won't observe DST this year. That CENAM web page is reasonably generic and perhaps its author didn't think about (or want to think about) predicting exactly what will happen in April.

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