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Leap seconds puzzle
by Paul_Koning＠dell.com April 9, 2015

April 9, 2015

Gentlepeople, I’ve been sorting to a flurry of questions about leap seconds from colleagues (triggered by the recent announcement of an upcoming leap second). That sent me to the Theory file, and some experiments. Those experiments leave me puzzled. I apologize for going a bit off topic for this list, but the expertise is clearly here. The Theory file says that POSIX requires leap seconds to be ignored. And indeed, if I set my system timezone to a POSIX zone description and ask it to convert a time value that’s an integer multiple of 86400, I end up at an exact hour (or half hour) multiple, for example exactly midnight if UTC. And similarly, if I set my zone to a “right” one and do the conversion, I get a time that’s a few seconds shy of the exact multiple, as expected. I can also see that my default timezone definitions on my various Unix machines are POSIX ones, again as expected. So here is the puzzle. I would expect WWV, and www.time.gov, to reflect leap seconds. So why would they give me a time that matches, to the second, the POSIX time on my workstation? Does NTP send POSIX seconds since epoch rather than real ones? paul

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Egypt DST starts one week later
by Steffen Thorsen April 8, 2015

April 8, 2015

According to several news reports, Egypt will start DST on midnight after Thursday, April 30, 2015. This is based on a law (no 35) from May 15, 2014 saying it starts the last Thursday of April. This means we will to change the rule to "lastThu 24:00s" instead of "lastFri 0:00s". Clocks will still be turned back for Ramadan, but dates not yet announced. Some sources (Arabic): http://www.masralarabia.com/%D8%A7%D8%AE%D8%A8%D8%A7%D8%B1-%D9%85%D8%B5%D8%… http://almogaz.com/news/weird-news/2015/04/05/1947105 Our English summary: http://www.timeanddate.com/news/time/egypt-starts-dst-2015.html Best regards, Steffen Thorsen - timeanddate.com

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Liberal and conservative time zones in 1950s Nashville
by Paul Eggert April 7, 2015

April 7, 2015

In 1950s Nashville a public clock had dueling faces, one for conservatives and the other for liberals; the two sides didn't agree about the time of day. I haven't found a photo of this clock, nor have I tracked down the TIME magazine report cited below, but here's the story as told by the late American journalist John Seigenthaler, who was there: "The two [newspaper] owners held strongly contrasting political and ideological views. Evans was a New South liberal, Stahlman an Old South conservative, and their two papers frequently clashed editorially, often on the same day.... In the 1950s as the state legislature was grappling with the question of whether to approve daylight saving time for the entire state, TIME magazine reported: "'The Nashville Banner and The Nashville Tennessean rarely agree on anything but the time of day — and last week they couldn't agree on that.' "It was all too true. The clock on the front of the building had two faces — The Tennessean side of the building facing west, the other, east. When it was high noon Banner time, it was 11 a.m. Tennessean time." My source: Seigenthaler J. For 100 years, Tennessean had it covered. The Tennessean 2007-05-11, republished 2015-04-06. http://www.tennessean.com/story/insider/extras/2015/04/06/archives-seigenth…

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[PROPOSED PATCH] Propagate Chile changes to Antarctica/Palmer
by Paul Eggert April 6, 2015

April 6, 2015

When recently changing the 'Chile' ruleset in 'southamerica', I forgot to update its copy 'ChileAQ' in 'antarctica'. This sort of thing has been a continuing problem over the years. Attempt to make further recurrences less likely by moving 'Antarctica/Palmer' from 'antarctica' to 'southamerica', so that there's no need to copy the rules in question. * antarctica (ArgAQ, ChileAQ): Remove. (Antarctica/Palmer): Move to ... * southamerica: ... this file, and use plain 'Arg' and 'Chile'. * NEWS: Mention Antarctica/Palmer and the other affected zones. --- NEWS | 3 ++- antarctica | 51 +-------------------------------------------------- southamerica | 22 +++++++++++++++++++--- 3 files changed, 22 insertions(+), 54 deletions(-) diff --git a/NEWS b/NEWS index 35d2c10..8bef7a5 100644 --- a/NEWS +++ b/NEWS @@ -4,7 +4,8 @@ Unreleased, experimental changes Changes affecting past time stamps - The following changes affect some pre-1991 time stamps in Chile: + The following changes affect some pre-1991 Chile-related time stamps + in America/Santiago, Antarctica/Palmer, and Pacific/Easter. The 1910 transition was January 10, not January 1. diff --git a/antarctica b/antarctica index ebae994..2af088f 100644 --- a/antarctica +++ b/antarctica @@ -15,41 +15,6 @@ # I made up all time zone abbreviations mentioned here; corrections welcome! # FORMAT is 'zzz' and GMTOFF is 0 for locations while uninhabited. -# These rules are stolen from the 'southamerica' file. -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule ArgAQ 1964 1966 - Mar 1 0:00 0 - -Rule ArgAQ 1964 1966 - Oct 15 0:00 1:00 S -Rule ArgAQ 1967 only - Apr 2 0:00 0 - -Rule ArgAQ 1967 1968 - Oct Sun>=1 0:00 1:00 S -Rule ArgAQ 1968 1969 - Apr Sun>=1 0:00 0 - -Rule ArgAQ 1974 only - Jan 23 0:00 1:00 S -Rule ArgAQ 1974 only - May 1 0:00 0 - -Rule ChileAQ 1972 1986 - Mar Sun>=9 3:00u 0 - -Rule ChileAQ 1974 1987 - Oct Sun>=9 4:00u 1:00 S -Rule ChileAQ 1987 only - Apr 12 3:00u 0 - -Rule ChileAQ 1988 1989 - Mar Sun>=9 3:00u 0 - -Rule ChileAQ 1988 only - Oct Sun>=1 4:00u 1:00 S -Rule ChileAQ 1989 only - Oct Sun>=9 4:00u 1:00 S -Rule ChileAQ 1990 only - Mar 18 3:00u 0 - -Rule ChileAQ 1990 only - Sep 16 4:00u 1:00 S -Rule ChileAQ 1991 1996 - Mar Sun>=9 3:00u 0 - -Rule ChileAQ 1991 1997 - Oct Sun>=9 4:00u 1:00 S -Rule ChileAQ 1997 only - Mar 30 3:00u 0 - -Rule ChileAQ 1998 only - Mar Sun>=9 3:00u 0 - -Rule ChileAQ 1998 only - Sep 27 4:00u 1:00 S -Rule ChileAQ 1999 only - Apr 4 3:00u 0 - -Rule ChileAQ 1999 2010 - Oct Sun>=9 4:00u 1:00 S -Rule ChileAQ 2000 2007 - Mar Sun>=9 3:00u 0 - -# N.B.: the end of March 29 in Chile is March 30 in Universal time, -# which is used below in specifying the transition. -Rule ChileAQ 2008 only - Mar 30 3:00u 0 - -Rule ChileAQ 2009 only - Mar Sun>=9 3:00u 0 - -Rule ChileAQ 2010 only - Apr Sun>=1 3:00u 0 - -Rule ChileAQ 2011 only - May Sun>=2 3:00u 0 - -Rule ChileAQ 2011 only - Aug Sun>=16 4:00u 1:00 S -Rule ChileAQ 2012 2015 - Apr Sun>=23 3:00u 0 - -Rule ChileAQ 2012 2014 - Sep Sun>=2 4:00u 1:00 S - # Argentina - year-round bases # Belgrano II, Confin Coast, -770227-0343737, since 1972-02-05 # Carlini, Potter Cove, King George Island, -6414-0602320, since 1982-01 @@ -344,21 +309,7 @@ Zone Antarctica/Rothera 0 - zzz 1976 Dec 1 # USA - year-round bases # # Palmer, Anvers Island, since 1965 (moved 2 miles in 1968) -# -# From Ethan Dicks (1996-10-06): -# It keeps the same time as Punta Arenas, Chile, because, just like us -# and the South Pole, that's the other end of their supply line.... -# I verified with someone who was there that since 1980, -# Palmer has followed Chile. Prior to that, before the Falklands War, -# Palmer used to be supplied from Argentina. -# -# Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone Antarctica/Palmer 0 - zzz 1965 - -4:00 ArgAQ AR%sT 1969 Oct 5 - -3:00 ArgAQ AR%sT 1982 May - -4:00 ChileAQ CL%sT 2015 Apr 26 3:00u - -3:00 - CLT -# +# See 'southamerica' for Antarctica/Palmer, since it uses South American DST. # # McMurdo Station, Ross Island, since 1955-12 # Amundsen-Scott South Pole Station, continuously occupied since 1956-11-20 diff --git a/southamerica b/southamerica index 908dd6e..be63a88 100644 --- a/southamerica +++ b/southamerica @@ -1225,9 +1225,6 @@ Zone America/Rio_Branco -4:31:12 - LMT 1914 # From Paul Eggert (2015-03-03): # For now, assume that the extension will persist indefinitely. -# NOTE: ChileAQ rules for Antarctic bases are stored separately in the -# 'antarctica' file. - # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Chile 1927 1931 - Sep 1 0:00 1:00 S Rule Chile 1928 1932 - Apr 1 0:00 0 - @@ -1289,6 +1286,25 @@ Zone Pacific/Easter -7:17:28 - LMT 1890 # Other Chilean locations, including Juan Fernández Is, Desventuradas Is, # and Antarctic bases, are like America/Santiago. +# Antarctic base using South American rules +# (See the file 'antarctica' for more.) +# +# Palmer, Anvers Island, since 1965 (moved 2 miles in 1968) +# +# From Ethan Dicks (1996-10-06): +# It keeps the same time as Punta Arenas, Chile, because, just like us +# and the South Pole, that's the other end of their supply line.... +# I verified with someone who was there that since 1980, +# Palmer has followed Chile. Prior to that, before the Falklands War, +# Palmer used to be supplied from Argentina. +# +# Zone NAME GMTOFF RULES FORMAT [UNTIL] +Zone Antarctica/Palmer 0 - zzz 1965 + -4:00 Arg AR%sT 1969 Oct 5 + -3:00 Arg AR%sT 1982 May + -4:00 Chile CL%sT 2015 Apr 26 3:00u + -3:00 - CLT + # Colombia # Milne gives 4:56:16.4 for Bogotá time in 1899; round to nearest. He writes, -- 2.1.0

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Re: [tz] [IANA #817081] Re: New time zone in Quintana Roo, Mexico.
by Ricardo Muleiro April 4, 2015

April 4, 2015

Hi, I´m trying to advise that in Quintana Roo, Mexico government change time zone to GTM - 5:00 permanently (entire year). ¿Can you help me? Thank you so much. 2015-04-03 13:01 GMT-05:00 Amanda Baber via RT <iana-questions(a)iana.org>: > Hi Ricardo, > > Sorry, but we need you to go to the mailing list -- there may be questions > that we can't answer. See > > https://mm.icann.org/mailman/listinfo/tz > > Thanks, and sorry we can't be more helpful, > > Amanda Baber > IANA Request Specialist > ICANN > > On Fri Apr 03 17:56:10 2015, ricardomuleiro(a)blueray.mx wrote: > > Thank you so much for your response. Is there any way you can give my > > message to responsible for changes? > > > > > > > > Thanks again. > > > > > > > > 2015-04-03 12:21 GMT-05:00 Amanda Baber via RT <iana-questions(a)iana.org > >: > > > > > Dear Ricardo, > > > > > > Thank you for contacting us. > > > > > > Per the Time Zone Coordinator and RFC 6557, questions and comments > about > > > the contents of the Time Zone Database should be posted on the TZ > mailing > > > list. > > > > > > We host the database, but updates are made by the TZ Coordinator in > > > consultation with the list. > > > > > > For archives and subscription information, please see > > > > > > http://www.iana.org/time-zones > > > > > > Best regards, > > > > > > Amanda Baber > > > IANA Request Specialist > > > ICANN > > > > > > On Fri Apr 03 16:04:16 2015, ricardomuleiro(a)blueray.mx wrote: > > > > Hi, I live in Cancún, Benito Juárez, Quintana Roo, México and > recently, > > > the > > > > state government decided to change our time zone, being now > permanently > > > GTM > > > > - 5:00. Right now, 1 hour ahead Mexico City (capital of our > country). I > > > > believe you haven´t updated this information. Thank you so much for > > > > updating it. > > > > > > > > > > > > > > > > Best regards. > > > > > > > > > > > > > > >

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Re: [tz] Chile TZ rule 1942 June superfluous?
by Alois Treindl April 4, 2015

April 4, 2015

I have extracted http://www.horaoficial.cl/historia_hora.html 1884 .... (irrelevant here) 1919 A partir del 1° de julio, se cambió la hora estándar, adoptando como hora oficial, la hora del meridiano del Observatorio Astronómico de Lo Espejo en Santiago, o sea, 4 horas, 42 minutos, 46,3 segundos, correspondiente a 70º 41' 34,5 " W, de Greenwich, en vez de la zona 20 del huso horario terrestre. Información difundida por el Boletín Nº 24, Aviso Nº 103/ 1919. 1927 Por Decreto Supremo N" 5.693, del 22 de agosto, se adoptaron dos horas diferentes. La hora oficial de invierno, correspondiente al meridiano 75º weste (zona +5) y la hora oficial de verano, correspondiente al meridiano 60º weste (zona +4), efectuándose los cambios el 1º de abril y el 1º de septiembre de cada año. Novedad que fue difundida por el Boletín Nº 11, por aviso Nº 56/1928. Este sistema de hora económica se vino a hacer efectivo sólo el 1º de abril de 1928. 1928 Se adquirió un cable forrado en plomo a la Compañía de Teléfonos, para conectar la Estación Horariacon la Radio Estación de Playa Ancha y a su vez con el cañón del cuartel Silva Palma. Jefe de la Estación Horaria, en esa fecha era el Sr. Cristian Wiegand O. 1941 AI cumplir el Departamento de Navegación e Hidrografía, 67 años de existencia, contaba en esa fecha la Estación Horaria con cinco relojes de alta precisión conocidos bajo el nombre de "péndulos", los cuales son controlados entre sí. De estos cinco péndulos, tres son eléctricos y dos son mecánicos en sus mecanismos de cuerda. De los tres péndulos eléctricos el principal y de mayor precisión llamado "péndulo magistral eléctrico", trabaja dentro de una campana de cobre con vidrio en su parte superior, bajo un vacío de 150 milímetros. Los otros dos péndulos eran los repetidores del magistral. 1943 El reloj de péndulo que fue destruido por el terremoto de 1906, es reconstruido totalmente y puesto en servicio por el personal de la sección Cronómetros del Departamento de Navegación e Hidrografía, reloj que seconserva en funcionamiento en este Servicio junto a otros tres de antigua data. 1946 El 27 de agosto, se publica la Ley Nº 8.522, que dispuso el cambio urgente de la hora para Santiago y la zona central del país, ante la incapacidad de las plantas de satisfacer las demandas de energía eléctrica para la industria, comercio, residencias y alumbrado público, quedando la capital y la zona central con el huso horario de +3 horas y el resto del país con un huso horario +4 horas. Boletín Nº 20, aviso Nº 380/1946, de fecha 31 de octubre de 1946. 1947 Con fecha 17 de mayo por Decreto Supremo Nº 8.777, se deroga la ley del año anterior, y se cambia la hora estándar, adoptando la hora oficial correspondiente a la zona +4 (meridiano del Observatorio de Lo Espejo, 60º weste) que rige para toda la República, a contar del 21 de mayo de 1947 a las 23 horas. Boletín Nº 10, aviso Nº 249/1947, de fecha 31 de mayo de 1947. 1959 Se procedió a la adquisición, armado e instalación, junto con la etapa de pruebas, de los relojes electrónicos de cuarzo, marca "Rhode & Schwartz", los que entraron oficialmente en servicio en 1964. -- rest irrelevant here It does contains the onset of DST rules in 1927 for 'cada ano' = each year, but no mention of a change of rules in 1932. By the way, it is interesting to note that this source confirms in the 1946 entry a division of the country into two zones, 'la capital y la zone central' and 'el resto del pais'. The capital is represented in tzdata as America/Santiago, the 'resto del pais' is not represented in tzdata, probably because the split ended before 1970. Possibly the split ended already on 21 May 1947, as it says 'zona +4 que rige para toda la Republica'. On 29.03.15 20:37, Arthur David Olson wrote: > ...which references a web page... > http://www.horaoficial.cl/horaof.htm

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Re: [tz] Belarus is listed in MSK timezone
by Matt Johnson April 3, 2015

April 3, 2015

How can we even hope to achieve time zone abbreviations that follow what people use on the ground if some places don't use abbreviations at all? We also impose English abbreviations, when English might not be spoken in the region at all. IIRC, doesn't French Canada have abbreviations like HNE instead of EST? Personally, I'd rather see abbreviations removed entirely. If folks want them for display, they should probably get them from CLDR, where the can be properly localized. All we really need in tzdb is a flag to identify whether to use a standard-time or daylight-time version of the abbreviation. Am I wrong? I suppose some of the historical values like those used in "war time" wouldn't be in cldr, but couldn't those be moved to a separate file? ________________________________ From: Alan Barrett<mailto:apb@cequrux.com> Sent: ‎4/‎2/‎2015 12:57 PM To: tz(a)iana.org<mailto:tz@iana.org> Subject: Re: [tz] Belarus is listed in MSK timezone On Wed, 01 Apr 2015, Dzmitry Kazimirchyk wrote: > The main problem here is with MSK being both historically and > nowadays widely known as "Moscow time" and absolutely zero > public awareness of the fact that now it can also mean "Minsk > time" in addition to lack of any official sources explaining > that. What time zone abbreviation do people, news media, or official government sources in Belarus use to refer to their time zone? If there is a simple answer, than that's what should go into the tz database. If people on the ground disagree about the abreviation, then we can conduct some sort of popularity survey, as we did with Australia and the EST versus AEST question. If people on the ground don't use any abbreviation, then I suppose the tz project has to guess or invent something. --apb (Alan Barrett)

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Re: [tz] Chilean time change
by Glenn Eychaner April 3, 2015

April 3, 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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Egypt transitions around Ramadan don't match timeanddate.com
by Patsy Franklin April 2, 2015

April 2, 2015

Hi, In 2014e tzdata NEWS file stated: > Release 2014e - 2014-06-12 21:53:52 -0700 >> >> Changes affecting near-future time stamps >> >> Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. >> (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily >> switch to standard time at 24:00 the last Thursday before Ramadan, and >> back to DST at 00:00 the first Friday after Ramadan. Since Ramadan appears to start on Thursday, June 18 this year: http://www.timeanddate.com/holidays/us/ramadan-begins I'm not sure if we should be transitioning on June 18 or June 11. tzdata is set to transition on the June 11. While timeanddate is expecting to transition on June 18. The end of Ramadan transition back to DST also differs between timeanddate and tzdata. Can someone please confirm the correct transition dates? Thanks! Patsy

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about DST in Europe
by David Carrara March 31, 2015

March 31, 2015

Good day, i'm writting to you about the file "europe" taken from tzdata-latest.tar.gz I read in it : « # There shouldn't be any [current members who are not using EU rules]. # A Directive has the force of law, member states are obliged to enact # national law to implement it. The only contentious issue was the # different end date for the UK and Ireland, and this was always allowed # in the Directive. » But i think this is small imprecision. in our European official documents there is a directive saying WHEN to change but i've never seen any directive saying we had to change (each country is free). The purpose of this directive is not to have everybody changing on his own date. It's easier with only one date, the same for all. There is no real mistakes in the file, since every Member States is already applying DST for now. So it sounds like it's the same. But I think these lines in the file maintain the imprecision. Furthermore, the tzdata file says « only contentious issue was the different end date for the UK and Ireland, and this was always allowed in the Directive. » But when I read the directive I see no exception about them. They don't have same timezone, but —it's the purpose of my email— having same timezone or not is not a part of the directive. So no exception is required about them. Neither about DST observance, each country can choose to have DST or not. It's all only about the schedule, then UK and Ireland are applying their DST at the same date we do (i'm in France). They change the same day at 1am UTC. So they don't create any exception at all. AND you can read this directive (link below), there is no line about UK ; source, European's 2000/84/CE directive ; http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2001:031:0021:00… The only one exception is this line « shall not apply to the overseas territories of the Member States. » (geographical reasons) We also read in that directive that a 5 years-long schedule is made in advance. That means if anything has to change we will have to tell in advance. Thank you -- David C.

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