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Several changes to Chile time stamps 1890-1990
(Thanks to Alois Treindl for reporting the problem.) * southamerica (Chile, America/Santiago, Pacific/Easter): Fix several problems in the Chilean data from 1890 through 1990. * NEWS: Document this.
This commit is contained in:
Paul Eggert
23
NEWS
23
NEWS
@ -4,6 +4,29 @@ Unreleased, experimental changes
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Changes affecting past time stamps
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The following changes affect some pre-1991 time stamps in Chile:
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The 1910 transition was January 10, not January 1.
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The 1918 transition was September 10, not September 1.
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The UTC-4 time observed from 1932 to 1942 is now considered to be
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standard time, not year-round DST.
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Santiago observed DST (UTC-3) from 1946-07-15 through 1946-08-31,
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then reverted to standard time, then switched its time zone to
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UTC-5 on 1947-04-01.
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Assume transitions before 1968 were at 00:00, since we have no data
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saying otherwise.
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The spring 1988 transition was 1988-10-09, not 1988-10-02.
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The fall 1990 transition was 1990-03-11, not 1990-03-18.
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Assume no UTC offset change for Pacific/Easter on 1890-01-01,
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and omit all transitions on Pacific/Easter from 1942 through 1946
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since we have no data suggesting that they existed.
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One more zone has been turned into a link, as it differed
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from an existing zone only for older time stamps. As usual,
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this change affects UTC offsets in pre-1970 time stamps only.
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134
southamerica
134
southamerica
@ -1098,6 +1098,60 @@ Zone America/Rio_Branco -4:31:12 - LMT 1914
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# Chile
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# From Paul Eggert (2015-04-03):
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# Shanks & Pottenger says America/Santiago introduced standard time in
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# 1890 and rounds its UTC offset to 70W40; guess that in practice this
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# was the same offset as in 1916-1919. It also says Pacific/Easter
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# standardized on 109W22 in 1890; assume this didn't change the clocks.
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#
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# Dates for America/Santiago from 1910 to 2004 are primarily from
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# the following source, cited by Oscar van Vlijmen (2006-10-08):
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# [1] Chile Law
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# http://www.webexhibits.org/daylightsaving/chile.html
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# This contains a copy of a this official table:
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# Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30)
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# http://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm
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# [1] needs several corrections, though.
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#
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# The first set of corrections is from:
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# [2] History of the Official Time of Chile
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# http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See:
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# http://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html
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# This is an English translation of:
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# Historia de la hora oficial de Chile (retrieved 2012-10-24). See:
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# http://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm
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# A fancier Spanish version (requiring mouse-clicking) is at:
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# http://www.horaoficial.cl/historia_hora.html
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# Conflicts between [1] and [2] were resolved as follows:
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#
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# - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites
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# Boletín Nº 1, Aviso Nº 1 (1910). Go with [2].
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#
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# - [1] says SMT was -4:42:45, [2] says Chile's official time from
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# 1916 to 1919 was -4:42:46.3, the meridian of Chile's National
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# Astronomical Observatory (OAN), then located in what is now
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# Quinta Normal in Santiago. Go with [2], rounding it to -4:42:46.
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#
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# - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites
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# Boletín Nº 22, Aviso Nº 129/1918 (1918-08-23). Go with [2].
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#
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# - [1] does not give times for transitions; assume they occur
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# at midnight mainland time, the current common practice. However,
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# go with [2]'s specification of 23:00 for the 1947-05-21 transition.
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#
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# Another correction to [1] is from Jesper Nørgaard Welen, who
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# wrote (2006-10-08), "I think that there are some obvious mistakes in
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# the suggested link from Oscar van Vlijmen,... for instance entry 66
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# says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at
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# 1990-09-15 (they should have been 1990-09-15 and 1990-09-16
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# respectively), but anyhow it clears up some doubts too."
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#
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# Data for Pacific/Easter from 1910 through 1967 come from Shanks &
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# Pottenger. After that, for lack of better info assume
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# Pacific/Easter is always two hours behind America/Santiago;
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# this is known to work for DST transitions starting in 2008 and
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# may well be true for earlier transitions.
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# From Eduardo Krell (1995-10-19):
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# The law says to switch to DST at midnight [24:00] on the second SATURDAY
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# of October.... The law is the same for March and October.
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@ -1110,78 +1164,35 @@ Zone America/Rio_Branco -4:31:12 - LMT 1914
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# Because of the same drought, the government decided to end DST later,
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# on April 3, (one-time change).
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# From Oscar van Vlijmen (2006-10-08):
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# http://www.horaoficial.cl/cambio.htm
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# From Jesper Nørgaard Welen (2006-10-08):
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# I think that there are some obvious mistakes in the suggested link
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# from Oscar van Vlijmen,... for instance entry 66 says that GMT-4
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# ended 1990-09-12 while entry 67 only begins GMT-3 at 1990-09-15
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# (they should have been 1990-09-15 and 1990-09-16 respectively), but
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# anyhow it clears up some doubts too.
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# From Paul Eggert (2014-08-12):
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# The following data entries for Chile and America/Santiago are from
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# <http://www.horaoficial.cl/horaof.htm> (2006-09-20), transcribed by
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# Jesper Nørgaard Welen. The data entries for Pacific/Easter are from Shanks
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# & Pottenger, except with DST transitions after 1932 cloned from
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# America/Santiago. The pre-1980 Pacific/Easter data entries are dubious,
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# but we have no other source.
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# From Germán Poo-Caamaño (2008-03-03):
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# Due to drought, Chile extends Daylight Time in three weeks. This
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# is one-time change (Saturday 3/29 at 24:00 for America/Santiago
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# and Saturday 3/29 at 22:00 for Pacific/Easter)
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# The Supreme Decree is located at
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# http://www.shoa.cl/servicios/supremo316.pdf
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# and the instructions for 2008 are located in:
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# http://www.horaoficial.cl/cambio.htm
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#
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# From José Miguel Garrido (2008-03-05):
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# ...
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# You could see the announces of the change on
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# http://www.shoa.cl/noticias/2008/04hora/hora.htm
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# From Angel Chiang (2010-03-04):
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# Subject: DST in Chile exceptionally extended to 3 April due to earthquake
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# http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098
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# (in Spanish, last paragraph).
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#
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# This is breaking news. There should be more information available later.
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# From Arthur David Olson (2010-03-06):
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# Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch.
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# From Glenn Eychaner (2011-03-02):
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# It appears that the Chilean government has decided to postpone the
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# change from summer time to winter time again, by three weeks to April
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# 2nd:
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# http://www.emol.com/noticias/nacional/detalle/detallenoticias.asp?idnoticia=467651
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#
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# This is not yet reflected in the official "cambio de hora" site, but
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# probably will be soon:
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# http://www.horaoficial.cl/cambio.htm
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# From Arthur David Olson (2011-03-02):
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# The emol.com article mentions a water shortage as the cause of the
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# postponement, which may mean that it's not a permanent change.
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# From Glenn Eychaner (2011-03-28):
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# The article:
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# http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E}
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#
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# In English:
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# Chile's clocks will go back an hour this year on the 7th of May instead
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# of this Saturday. They will go forward again the 3rd Saturday in
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# August, not in October as they have since 1968. This is a pilot plan
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# which will be reevaluated in 2012.
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# August, not in October as they have since 1968.
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# From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23):
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# As stated in the website of the Chilean Energy Ministry
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# http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html
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# The Chilean Government has decided to postpone the entrance into winter time
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# (to leave DST) from March 11 2012 to April 28th 2012. The decision has not
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# been yet formalized but it will within the next days.
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# (to leave DST) from March 11 2012 to April 28th 2012....
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# Quote from the website communication:
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#
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# 6. For the year 2012, the dates of entry into winter time will be as follows:
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@ -1218,13 +1229,8 @@ Zone America/Rio_Branco -4:31:12 - LMT 1914
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# 'antarctica' file.
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# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
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Rule Chile 1927 1932 - Sep 1 0:00 1:00 S
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Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
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Rule Chile 1928 1932 - Apr 1 0:00 0 -
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Rule Chile 1942 only - Jun 1 4:00u 0 -
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Rule Chile 1942 only - Aug 1 5:00u 1:00 S
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Rule Chile 1946 only - Jul 15 4:00u 1:00 S
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Rule Chile 1946 only - Sep 1 3:00u 0:00 -
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Rule Chile 1947 only - Apr 1 4:00u 0 -
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Rule Chile 1968 only - Nov 3 4:00u 1:00 S
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Rule Chile 1969 only - Mar 30 3:00u 0 -
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Rule Chile 1969 only - Nov 23 4:00u 1:00 S
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@ -1235,10 +1241,8 @@ Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 -
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Rule Chile 1973 only - Sep 30 4:00u 1:00 S
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Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 S
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Rule Chile 1987 only - Apr 12 3:00u 0 -
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Rule Chile 1988 1989 - Mar Sun>=9 3:00u 0 -
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Rule Chile 1988 only - Oct Sun>=1 4:00u 1:00 S
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Rule Chile 1989 only - Oct Sun>=9 4:00u 1:00 S
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Rule Chile 1990 only - Mar 18 3:00u 0 -
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Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 -
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Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 S
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Rule Chile 1990 only - Sep 16 4:00u 1:00 S
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Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 -
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Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 S
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@ -1261,15 +1265,21 @@ Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 S
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# (1996-09) says 1998-03-08. Ignore these.
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# Zone NAME GMTOFF RULES FORMAT [UNTIL]
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Zone America/Santiago -4:42:46 - LMT 1890
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-4:42:46 - SMT 1910 # Santiago Mean Time
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-4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time
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-5:00 - CLT 1916 Jul 1 # Chile Time
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-4:42:46 - SMT 1918 Sep 1 # Santiago Mean Time
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-4:00 - CLT 1919 Jul 1 # Chile Time
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-4:42:46 - SMT 1927 Sep 1 # Santiago Mean Time
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-5:00 Chile CL%sT 1947 May 22 # Chile Time
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-4:42:46 - SMT 1918 Sep 10
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-4:00 - CLT 1919 Jul 1
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-4:42:46 - SMT 1927 Sep 1
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-5:00 Chile CL%sT 1932 Sep 1
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-4:00 - CLT 1942 Jun 1
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-5:00 - CLT 1942 Aug 1
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-4:00 - CLT 1946 Jul 15
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-4:00 1:00 CLST 1946 Sep 1 # central Chile
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-4:00 - CLT 1947 Apr 1
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-5:00 - CLT 1947 May 21 23:00
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-4:00 Chile CL%sT 2015 Apr 26 3:00u
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-3:00 - CLT
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Zone Pacific/Easter -7:17:44 - LMT 1890
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Zone Pacific/Easter -7:17:28 - LMT 1890
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-7:17:28 - EMT 1932 Sep # Easter Mean Time
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-7:00 Chile EAS%sT 1982 Mar 14 3:00u # Easter Time
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-6:00 Chile EAS%sT 2015 Apr 26 3:00u
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