Chile tz data

# 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.
# (1998-09-29):
# Because of the drought this year, the government decided to go into
# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
# (unless there's another dry season next year, I guess).

# From Julio I. Pacheco Troncoso (1999-03-18):
# Because of the same drought, the government decided to end DST later,
# on April 3, (one-time change).

# 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
#
# From José Miguel Garrido (2008-03-05):
# 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
#
# From Arthur David Olson (2010-03-06):
# Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch.

# From Glenn Eychaner (2011-03-28):
# 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.

# 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....
# Quote from the website communication:
#
# 6. For the year 2012, the dates of entry into winter time will be as follows:
# a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at
# 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00
# of the same day.
# b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is,
# at 23:59:59, instead of passing to 0:00, the time should be adjusted to be
# 01:00 on September 2.

# From Steffen Thorsen (2013-02-15):
# According to several news sources, Chile has extended DST this year,
# they will end DST later and start DST earlier than planned.  They
# hope to save energy.  The new end date is 2013-04-28 00:00 and new
# start date is 2013-09-08 00:00....
# http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm

# From José Miguel Garrido (2014-02-19):
# Today appeared in the Diario Oficial a decree amending the time change
# dates to 2014.
# DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC)
# DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC)
# http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf

# From Eduardo Romero Urra (2015-03-03):
# Today has been published officially that Chile will use the DST time
# permanently until March 25 of 2017
# http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg
#
# From Paul Eggert (2015-03-03):
# For now, assume that the extension will persist indefinitely.

# From Juan Correa (2016-03-18):
# The decree regarding DST has been published in today's Official Gazette:
# http://www.diariooficial.interior.gob.cl/versiones-anteriores/do/20160318/
# http://www.leychile.cl/Navegar?idNorma=1088502
# It does consider the second Saturday of May and August as the dates
# for the transition; and it lists DST dates until 2019, but I think
# this scheme will stick.
#
# From Paul Eggert (2016-03-18):
# For now, assume the pattern holds for the indefinite future.
# The decree says transitions occur at 24:00; in practice this appears
# to mean 24:00 mainland time, not 24:00 local time, so that Easter
# Island is always two hours behind the mainland.

# 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	-
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
Rule	Chile	1970	only	-	Mar	29	3:00u	0	-
Rule	Chile	1971	only	-	Mar	14	3:00u	0	-
Rule	Chile	1970	1972	-	Oct	Sun>=9	4:00u	1:00	S
Rule	Chile	1972	1986	-	Mar	Sun>=9	3:00u	0	-
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	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
Rule	Chile	1997	only	-	Mar	30	3:00u	0	-
Rule	Chile	1998	only	-	Mar	Sun>=9	3:00u	0	-
Rule	Chile	1998	only	-	Sep	27	4:00u	1:00	S
Rule	Chile	1999	only	-	Apr	 4	3:00u	0	-
Rule	Chile	1999	2010	-	Oct	Sun>=9	4:00u	1:00	S
Rule	Chile	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	Chile	2008	only	-	Mar	30	3:00u	0	-
Rule	Chile	2009	only	-	Mar	Sun>=9	3:00u	0	-
Rule	Chile	2010	only	-	Apr	Sun>=1	3:00u	0	-
Rule	Chile	2011	only	-	May	Sun>=2	3:00u	0	-
Rule	Chile	2011	only	-	Aug	Sun>=16	4:00u	1:00	S
Rule	Chile	2012	2014	-	Apr	Sun>=23	3:00u	0	-
Rule	Chile	2012	2014	-	Sep	Sun>=2	4:00u	1:00	S
Rule	Chile	2016	max	-	May	Sun>=9	3:00u	0	-
Rule	Chile	2016	max	-	Aug	Sun>=9	4:00u	1:00	S
# IATA SSIM anomalies: (1992-02) says 1992-03-14;
# (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 Jan 10 # Santiago Mean Time
			-5:00	-	CLT	1916 Jul  1 # 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
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
#
# Salas y Gómez Island is uninhabited.
# 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