--- a/components/timezone/southamerica Thu Apr 16 11:08:39 2015 +0200
+++ b/components/timezone/southamerica Mon Apr 20 08:54:07 2015 -0700
@@ -1098,6 +1098,60 @@
# Chile
+# From Paul Eggert (2015-04-03):
+# Shanks & Pottenger says America/Santiago introduced standard time in
+# 1890 and rounds its UTC offset to 70W40; guess that in practice this
+# was the same offset as in 1916-1919. It also says Pacific/Easter
+# standardized on 109W22 in 1890; assume this didn't change the clocks.
+#
+# Dates for America/Santiago from 1910 to 2004 are primarily from
+# the following source, cited by Oscar van Vlijmen (2006-10-08):
+# [1] Chile Law
+# http://www.webexhibits.org/daylightsaving/chile.html
+# This contains a copy of a this official table:
+# Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30)
+# http://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm
+# [1] needs several corrections, though.
+#
+# The first set of corrections is from:
+# [2] History of the Official Time of Chile
+# http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See:
+# http://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html
+# This is an English translation of:
+# Historia de la hora oficial de Chile (retrieved 2012-10-24). See:
+# http://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm
+# A fancier Spanish version (requiring mouse-clicking) is at:
+# http://www.horaoficial.cl/historia_hora.html
+# Conflicts between [1] and [2] were resolved as follows:
+#
+# - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites
+# Boletín Nº 1, Aviso Nº 1 (1910). Go with [2].
+#
+# - [1] says SMT was -4:42:45, [2] says Chile's official time from
+# 1916 to 1919 was -4:42:46.3, the meridian of Chile's National
+# Astronomical Observatory (OAN), then located in what is now
+# Quinta Normal in Santiago. Go with [2], rounding it to -4:42:46.
+#
+# - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites
+# Boletín Nº 22, Aviso Nº 129/1918 (1918-08-23). Go with [2].
+#
+# - [1] does not give times for transitions; assume they occur
+# at midnight mainland time, the current common practice. However,
+# go with [2]'s specification of 23:00 for the 1947-05-21 transition.
+#
+# Another correction to [1] is from Jesper Nørgaard Welen, who
+# wrote (2006-10-08), "I think that there are some obvious mistakes in
+# the suggested link from Oscar van Vlijmen,... for instance entry 66
+# says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at
+# 1990-09-15 (they should have been 1990-09-15 and 1990-09-16
+# respectively), but anyhow it clears up some doubts too."
+#
+# Data for Pacific/Easter from 1910 through 1967 come from Shanks &
+# Pottenger. After that, for lack of better info assume
+# Pacific/Easter is always two hours behind America/Santiago;
+# this is known to work for DST transitions starting in 2008 and
+# may well be true for earlier transitions.
+
# From Eduardo Krell (1995-10-19):
# The law says to switch to DST at midnight [24:00] on the second SATURDAY
# of October.... The law is the same for March and October.
@@ -1110,78 +1164,35 @@
# Because of the same drought, the government decided to end DST later,
# on April 3, (one-time change).
-# From Oscar van Vlijmen (2006-10-08):
-# http://www.horaoficial.cl/cambio.htm
-
-# From Jesper Nørgaard Welen (2006-10-08):
-# I think that there are some obvious mistakes in the suggested link
-# from Oscar van Vlijmen,... for instance entry 66 says that GMT-4
-# ended 1990-09-12 while entry 67 only begins GMT-3 at 1990-09-15
-# (they should have been 1990-09-15 and 1990-09-16 respectively), but
-# anyhow it clears up some doubts too.
-
-# From Paul Eggert (2014-08-12):
-# The following data entries for Chile and America/Santiago are from
-# <http://www.horaoficial.cl/horaof.htm> (2006-09-20), transcribed by
-# Jesper Nørgaard Welen. The data entries for Pacific/Easter are from Shanks
-# & Pottenger, except with DST transitions after 1932 cloned from
-# America/Santiago. The pre-1980 Pacific/Easter data entries are dubious,
-# but we have no other source.
-
# From Germán Poo-Caamaño (2008-03-03):
# Due to drought, Chile extends Daylight Time in three weeks. This
# is one-time change (Saturday 3/29 at 24:00 for America/Santiago
# and Saturday 3/29 at 22:00 for Pacific/Easter)
# The Supreme Decree is located at
# http://www.shoa.cl/servicios/supremo316.pdf
-# and the instructions for 2008 are located in:
-# http://www.horaoficial.cl/cambio.htm
-
+#
# From José Miguel Garrido (2008-03-05):
-# ...
-# You could see the announces of the change on
# http://www.shoa.cl/noticias/2008/04hora/hora.htm
# From Angel Chiang (2010-03-04):
# Subject: DST in Chile exceptionally extended to 3 April due to earthquake
# http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098
-# (in Spanish, last paragraph).
#
-# This is breaking news. There should be more information available later.
-
# From Arthur David Olson (2010-03-06):
# Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch.
-# From Glenn Eychaner (2011-03-02):
-# It appears that the Chilean government has decided to postpone the
-# change from summer time to winter time again, by three weeks to April
-# 2nd:
-# http://www.emol.com/noticias/nacional/detalle/detallenoticias.asp?idnoticia=467651
-#
-# This is not yet reflected in the official "cambio de hora" site, but
-# probably will be soon:
-# http://www.horaoficial.cl/cambio.htm
-
-# From Arthur David Olson (2011-03-02):
-# The emol.com article mentions a water shortage as the cause of the
-# postponement, which may mean that it's not a permanent change.
-
# From Glenn Eychaner (2011-03-28):
-# The article:
# http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E}
-#
# In English:
# Chile's clocks will go back an hour this year on the 7th of May instead
# of this Saturday. They will go forward again the 3rd Saturday in
-# August, not in October as they have since 1968. This is a pilot plan
-# which will be reevaluated in 2012.
+# August, not in October as they have since 1968.
# From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23):
# As stated in the website of the Chilean Energy Ministry
# http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html
# The Chilean Government has decided to postpone the entrance into winter time
-# (to leave DST) from March 11 2012 to April 28th 2012. The decision has not
-# been yet formalized but it will within the next days.
+# (to leave DST) from March 11 2012 to April 28th 2012....
# Quote from the website communication:
#
# 6. For the year 2012, the dates of entry into winter time will be as follows:
@@ -1214,17 +1225,9 @@
# 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 1932 - Sep 1 0:00 1:00 S
+Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
Rule Chile 1928 1932 - Apr 1 0:00 0 -
-Rule Chile 1942 only - Jun 1 4:00u 0 -
-Rule Chile 1942 only - Aug 1 5:00u 1:00 S
-Rule Chile 1946 only - Jul 15 4:00u 1:00 S
-Rule Chile 1946 only - Sep 1 3:00u 0:00 -
-Rule Chile 1947 only - Apr 1 4:00u 0 -
Rule Chile 1968 only - Nov 3 4:00u 1:00 S
Rule Chile 1969 only - Mar 30 3:00u 0 -
Rule Chile 1969 only - Nov 23 4:00u 1:00 S
@@ -1235,10 +1238,8 @@
Rule Chile 1973 only - Sep 30 4:00u 1:00 S
Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 S
Rule Chile 1987 only - Apr 12 3:00u 0 -
-Rule Chile 1988 1989 - Mar Sun>=9 3:00u 0 -
-Rule Chile 1988 only - Oct Sun>=1 4:00u 1:00 S
-Rule Chile 1989 only - Oct Sun>=9 4:00u 1:00 S
-Rule Chile 1990 only - Mar 18 3:00u 0 -
+Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 -
+Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 S
Rule Chile 1990 only - Sep 16 4:00u 1:00 S
Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 -
Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 S
@@ -1261,15 +1262,21 @@
# (1996-09) says 1998-03-08. Ignore these.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Santiago -4:42:46 - LMT 1890
- -4:42:46 - SMT 1910 # Santiago Mean Time
+ -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time
-5:00 - CLT 1916 Jul 1 # Chile Time
- -4:42:46 - SMT 1918 Sep 1 # Santiago Mean Time
- -4:00 - CLT 1919 Jul 1 # Chile Time
- -4:42:46 - SMT 1927 Sep 1 # Santiago Mean Time
- -5:00 Chile CL%sT 1947 May 22 # Chile Time
+ -4:42:46 - SMT 1918 Sep 10
+ -4:00 - CLT 1919 Jul 1
+ -4:42:46 - SMT 1927 Sep 1
+ -5:00 Chile CL%sT 1932 Sep 1
+ -4:00 - CLT 1942 Jun 1
+ -5:00 - CLT 1942 Aug 1
+ -4:00 - CLT 1946 Jul 15
+ -4:00 1:00 CLST 1946 Sep 1 # central Chile
+ -4:00 - CLT 1947 Apr 1
+ -5:00 - CLT 1947 May 21 23:00
-4:00 Chile CL%sT 2015 Apr 26 3:00u
-3:00 - CLT
-Zone Pacific/Easter -7:17:44 - LMT 1890
+Zone Pacific/Easter -7:17:28 - LMT 1890
-7:17:28 - EMT 1932 Sep # Easter Mean Time
-7:00 Chile EAS%sT 1982 Mar 14 3:00u # Easter Time
-6:00 Chile EAS%sT 2015 Apr 26 3:00u
@@ -1279,6 +1286,25 @@
# 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,