New timezone data.vendor/tzdata/tzdata2000d

Obtained from:	ftp://elsie.nci.nih.gov/pub/tzdata2000d.tar.gz

1 files changed, 177 insertions, 168 deletions

diff --git a/share/zoneinfo/southamerica b/share/zoneinfo/southamerica
index 3232c5c093b2..81797ff2a53d 100644
--- a/share/zoneinfo/southamerica
+++ b/share/zoneinfo/southamerica
@@ -1,15 +1,15 @@
-# @(#)southamerica	7.26
+# @(#)southamerica	7.35
 
 # This data is by no means authoritative; if you think you know better,
 # go ahead and edit the file (and please send any changes to
 # tz@elsie.nci.nih.gov for general use in the future).
 
-# From Paul Eggert <eggert@twinsun.com> (1996-11-22):
+# From Paul Eggert <eggert@twinsun.com> (1999-07-07):
 # A good source for time zone historical data outside the U.S. is
-# Thomas G. Shanks, The International Atlas (4th edition),
-# San Diego: ACS Publications, Inc. (1995).
+# Thomas G. Shanks, The International Atlas (5th edition),
+# San Diego: ACS Publications, Inc. (1999).
 #
-# Gwillim Law <LAW@encmail.encompass.com> writes that a good source
+# Gwillim Law <Gwil_Law@bridge-point.com> writes that a good source
 # for recent time zone data is the International Air Transport
 # Association's Standard Schedules Information Manual (IATA SSIM),
 # published semiannually.  Law sent in several helpful summaries
@@ -18,16 +18,6 @@
 # Except where otherwise noted, Shanks is the source for entries through 1990,
 # and IATA SSIM is the source for entries after 1990.
 #
-# The following abbreviations are used in this file.
-# Corrections are welcome!
-#		std	dst
-#		LMT		Local Mean Time
-#	-2:00	FST	FDT	Fernando de Noronha
-#	-3:00	EST	EDT	Eastern Brazil
-#	-4:00	WST	WDT	Western Brazil
-#	-4:00	AST	ADT	Atlantic
-#	-5:00	AST	ADT	Acre
-#
 # Earlier editions of these tables used the North American style (e.g. ARST and
 # ARDT for Argentine Standard and Daylight Time), but the following quote
 # suggests that it's better to use European style (e.g. ART and ARST).
@@ -36,15 +26,24 @@
 #	in Europe and South America.
 #	-- E O Cutler, _New York Times_ (1937-02-14), quoted in
 #	H L Mencken, _The American Language: Supplement I_ (1960), p 466
-
-
-# From Guy Harris:
-# From Official Airline Guide - Worldwide Edition (1987).  Countries not
-# listed here do not observe DST, according to the OAG.  Time zone names
-# are pure inventions, and none are supplied for countries not observing
-# DST; updates from natives would be appreciated.  The times that DST
-# starts and ends are based on the assumption that they switch a 2AM just
-# as everybody else does.
+#
+# Earlier editions of these tables also used the North American style
+# for time zones in Brazil, but this was incorrect, as Brazilians say
+# "summer time".  Reinaldo Goulart, a Sao Paulo businessman active in
+# the railroad sector, writes (1999-07-06):
+#	The subject of time zones is currently a matter of discussion/debate in
+#	Brazil.  Let's say that "the Brasilia time" is considered the
+#	"official time" because Brasilia is the capital city.
+#	The other three time zones are called "Brasilia time "minus one" or
+#	"plus one" or "plus two".  As far as I know there is no such
+#	name/designation as "Eastern Time" or "Central Time".
+# So I invented the following (English-language) abbreviations for now.
+# Corrections are welcome!
+#		std	dst
+#	-2:00	FNT	FNST	Fernando de Noronha
+#	-3:00	BRT	BRST	Brasilia
+#	-4:00	AMT	AMST	Amazon
+#	-5:00	ACT	ACST	Acre
 
 ###############################################################################
 
@@ -81,12 +80,12 @@ Rule	Arg	1963	only	-	Dec	15	0:00	1:00	S
 Rule	Arg	1964	1966	-	Mar	 1	0:00	0	-
 Rule	Arg	1964	1966	-	Oct	15	0:00	1:00	S
 Rule	Arg	1967	only	-	Apr	 1	0:00	0	-
-Rule	Arg	1967	1968	-	Oct	Sun<=7	0:00	1:00	S
-Rule	Arg	1968	1969	-	Apr	Sun<=7	0:00	0	-
+Rule	Arg	1967	1968	-	Oct	Sun>=1	0:00	1:00	S
+Rule	Arg	1968	1969	-	Apr	Sun>=1	0:00	0	-
 Rule	Arg	1974	only	-	Jan	23	0:00	1:00	S
 Rule	Arg	1974	only	-	May	 1	0:00	0	-
-Rule	Arg	1974	1976	-	Oct	Sun<=7	0:00	1:00	S
-Rule	Arg	1975	1977	-	Apr	Sun<=7	0:00	0	-
+Rule	Arg	1974	1976	-	Oct	Sun>=1	0:00	1:00	S
+Rule	Arg	1975	1977	-	Apr	Sun>=1	0:00	0	-
 Rule	Arg	1985	only	-	Nov	 2	0:00	1:00	S
 Rule	Arg	1986	only	-	Mar	14	0:00	0	-
 Rule	Arg	1986	1987	-	Oct	25	0:00	1:00	S
@@ -100,7 +99,7 @@ Rule	Arg	1988	only	-	Dec	 1	0:00	1:00	S
 # Talleres de Hidrografia Naval Argentina
 # (Argentine Naval Hydrography Institute)
 #
-# Shanks gives 1989 Mar 16 and stops after 1990 Mar 4; go with Otero.
+# Shanks stops after 1992-03-01; go with Otero.
 Rule	Arg	1989	1993	-	Mar	Sun>=1	0:00	0	-
 Rule	Arg	1989	1992	-	Oct	Sun>=15	0:00	1:00	S
 #
@@ -109,6 +108,18 @@ Rule	Arg	1989	1992	-	Oct	Sun>=15	0:00	1:00	S
 # time corrections was derogated and no more modifications
 # to the time zones (for daylight saving) are now made.
 #
+# From Rives McDow (2000-01-10):
+# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
+# which did not result in the switch of a time zone, as they stayed 9 hours
+# from the International Date Line.  On March 5, 2000, at 0:00 local time,
+# Argentina will come off daylight savings time, which will bring them to 8
+# hours from the International Date Line.
+#
+# From Peter Gradelski via Steffen Thorsen (2000-03-01):
+# We just checked with our San Paulo office and they say the government of
+# Argentina decided not to become one of the countries that go on or off DST.
+# So Buenos Aires should be -3 hours from GMT at all times.
+#
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 #
 # Buenos Aires (BA), Distrito Federal (DF), Santa Cruz (SC),
@@ -116,7 +127,7 @@ Rule	Arg	1989	1992	-	Oct	Sun>=15	0:00	1:00	S
 Zone America/Buenos_Aires -3:53:48 -	LMT	1894 Nov
 			-4:16:44 -	CMT	1920 May    # Cordoba Mean Time
 			-4:00	-	ART	1930 Dec
-			-4:00	Arg	AR%sT	1969 Oct 5
+			-4:00	Arg	AR%sT	1969 Oct  5
 			-3:00	Arg	AR%sT
 #
 # Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
@@ -124,7 +135,7 @@ Zone America/Buenos_Aires -3:53:48 -	LMT	1894 Nov
 Zone America/Rosario	-4:02:40 -	LMT	1894 Nov
 			-4:16:44 -	CMT	1920 May
 			-4:00	-	ART	1930 Dec
-			-4:00	Arg	AR%sT	1969 Oct 5
+			-4:00	Arg	AR%sT	1969 Oct  5
 			-3:00	Arg	AR%sT	1991 Jul
 			-3:00	-	ART
 #
@@ -133,7 +144,7 @@ Zone America/Rosario	-4:02:40 -	LMT	1894 Nov
 Zone America/Cordoba	-4:16:44 -	LMT	1894 Nov
 			-4:16:44 -	CMT	1920 May
 			-4:00	-	ART	1930 Dec
-			-4:00	Arg	AR%sT	1969 Oct 5
+			-4:00	Arg	AR%sT	1969 Oct  5
 			-3:00	Arg	AR%sT	1990 Jul
 			-3:00	-	ART
 #
@@ -152,7 +163,7 @@ Zone America/Jujuy	-4:21:12 -	LMT	1894 Nov
 Zone America/Catamarca	-4:23:08 -	LMT	1894 Nov
 			-4:16:44 -	CMT	1920 May
 			-4:00	-	ART	1930 Dec
-			-4:00	Arg	AR%sT	1969 Oct 5
+			-4:00	Arg	AR%sT	1969 Oct  5
 			-3:00	Arg	AR%sT	1990 Jul
 			-3:00	-	ART	1991 Jul
 			-3:00	Arg	AR%sT	1992 Jul
@@ -217,54 +228,32 @@ Zone	America/La_Paz	-4:32:36 -	LMT	1890
 # Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do
 # Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST.
 
-# From Paul Eggert (1996-11-22):
-# Let's make the following assumptions:
-#
-# * All data in Shanks are correct through 1990.  In particular,
-#   Shanks was right when he said Acre stopped observing DST in mid-1988.
-# * Areas where Shanks reports DST up to 1990, but the IATA reports no DST
-#   in 1995, stopped observing DST in mid-1990.
-#
-# Under these assumptions Brazil needs 7 entries to cover all the distinct
-# time zone histories since 1970:
-#
-# Noronha (UTC-2), Fortaleza (UTC-3), and Manaus (UTC-4) stopped observing DST
-#	in mid-1990.
-# Maceio (UTC-3) stopped observing DST in mid-1990, but started again mid-1995.
-# Sao Paulo (UTC-3) and Cuiaba (UTC-4) always observed DST.
-# Porto Acre (UTC-5) stopped observing DST in mid-1988.
-
-# From Rodrigo Feher <feher@pobox.com> (1998-01-17):
-# Reading "southamerica" file in timezone 7.55 I've found an
-# error. Line 193 say "Territory of Acre". It is not a territory anymore
-# but a state.
-
 # From Marcos Tadeu (1998-09-27):
 # <a href="http://pcdsh01.on.br/verao1.html">
 # Brazilian official page
 # </a>
 #
-# From Paul Eggert (1998-09-28):
+# From Paul Eggert (1998-10-29):
 # The official decrees referenced below are taken from
 # <a href="http://pcdsh01.on.br/DecHV.html">
 # Decretos sobre o Horario de Verao no Brasil
-# </a> (1998-09-25, in Portuguese).
+# </a> (1999-10-04, in Portuguese).
 
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 # Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01)
 # Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10)
-Rule	Brazil	1931	only	-	Oct	 3	11:00	1:00	D
-Rule	Brazil	1932	1933	-	Apr	 1	 0:00	0	S
-Rule	Brazil	1932	only	-	Oct	 3	 0:00	1:00	D
+Rule	Brazil	1931	only	-	Oct	 3	11:00	1:00	S
+Rule	Brazil	1932	1933	-	Apr	 1	 0:00	0	-
+Rule	Brazil	1932	only	-	Oct	 3	 0:00	1:00	S
 # Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10)
 # revoked DST.
 # Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24)
 # Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13)
-Rule	Brazil	1949	1952	-	Dec	 1	 0:00	1:00	D
-Rule	Brazil	1950	only	-	Apr	16	 1:00	0	S
-Rule	Brazil	1951	1952	-	Apr	 1	 0:00	0	S
+Rule	Brazil	1949	1952	-	Dec	 1	 0:00	1:00	S
+Rule	Brazil	1950	only	-	Apr	16	 1:00	0	-
+Rule	Brazil	1951	1952	-	Apr	 1	 0:00	0	-
 # Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24)
-Rule	Brazil	1953	only	-	Mar	 1	 0:00	0	S
+Rule	Brazil	1953	only	-	Mar	 1	 0:00	0	-
 # Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30)
 # revoked DST.
 # Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18)
@@ -272,52 +261,52 @@ Rule	Brazil	1953	only	-	Mar	 1	 0:00	0	S
 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
 # Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03)
 # extended the above decree to all of the national territory on 12-09.
-Rule	Brazil	1963	only	-	Dec	 9	 0:00	1:00	D
+Rule	Brazil	1963	only	-	Dec	 9	 0:00	1:00	S
 # Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25)
 # extended summer time by one day to 1964-03-01 00:00 (start of school).
-Rule	Brazil	1964	only	-	Mar	 1	 0:00	0	S
+Rule	Brazil	1964	only	-	Mar	 1	 0:00	0	-
 # Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27)
-Rule	Brazil	1965	only	-	Jan	31	 0:00	1:00	D
-Rule	Brazil	1965	only	-	Mar	31	 0:00	0	S
+Rule	Brazil	1965	only	-	Jan	31	 0:00	1:00	S
+Rule	Brazil	1965	only	-	Mar	31	 0:00	0	-
 # Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22)
-Rule	Brazil	1965	only	-	Dec	 1	 0:00	1:00	D
+Rule	Brazil	1965	only	-	Dec	 1	 0:00	1:00	S
 # Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18)
-Rule	Brazil	1966	1968	-	Mar	 1	 0:00	0	S
-Rule	Brazil	1966	1967	-	Nov	 1	 0:00	1:00	D
+Rule	Brazil	1966	1968	-	Mar	 1	 0:00	0	-
+Rule	Brazil	1966	1967	-	Nov	 1	 0:00	1:00	S
 # Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15)
 # revoked DST.
 # Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27)
-Rule	Brazil	1985	only	-	Nov	 2	 0:00	1:00	D
+Rule	Brazil	1985	only	-	Nov	 2	 0:00	1:00	S
 # Decree 92,310 (1986-01-21)
 # Decree 92,463 (1986-03-13)
-Rule	Brazil	1986	only	-	Mar	15	 0:00	0	S
+Rule	Brazil	1986	only	-	Mar	15	 0:00	0	-
 # Decree 93,316 (1986-10-01)
-Rule	Brazil	1986	only	-	Oct	25	 0:00	1:00	D
-Rule	Brazil	1987	only	-	Feb	14	 0:00	0	S
+Rule	Brazil	1986	only	-	Oct	25	 0:00	1:00	S
+Rule	Brazil	1987	only	-	Feb	14	 0:00	0	-
 # Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22)
-Rule	Brazil	1987	only	-	Oct	25	 0:00	1:00	D
-Rule	Brazil	1988	only	-	Feb	 7	 0:00	0	S
+Rule	Brazil	1987	only	-	Oct	25	 0:00	1:00	S
+Rule	Brazil	1988	only	-	Feb	 7	 0:00	0	-
 # Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12)
 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
-Rule	Brazil	1988	only	-	Oct	16	 0:00	1:00	D
-Rule	Brazil	1989	only	-	Jan	29	 0:00	0	S
+Rule	Brazil	1988	only	-	Oct	16	 0:00	1:00	S
+Rule	Brazil	1989	only	-	Jan	29	 0:00	0	-
 # Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21)
 # with the same exceptions
-Rule	Brazil	1989	only	-	Oct	15	 0:00	1:00	D
-Rule	Brazil	1990	only	-	Feb	11	 0:00	0	S
+Rule	Brazil	1989	only	-	Oct	15	 0:00	1:00	S
+Rule	Brazil	1990	only	-	Feb	11	 0:00	0	-
 # Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17)
 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
 # Decree 99,629 (1990-10-19) adds BA, MT.
-Rule	Brazil	1990	only	-	Oct	21	 0:00	1:00	D
-Rule	Brazil	1991	only	-	Feb	17	 0:00	0	S
+Rule	Brazil	1990	only	-	Oct	21	 0:00	1:00	S
+Rule	Brazil	1991	only	-	Feb	17	 0:00	0	-
 # <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25)
 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
-Rule	Brazil	1991	only	-	Oct	20	 0:00	1:00	D
-Rule	Brazil	1992	only	-	Feb	 9	 0:00	0	S
+Rule	Brazil	1991	only	-	Oct	20	 0:00	1:00	S
+Rule	Brazil	1992	only	-	Feb	 9	 0:00	0	-
 # <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16)
 # adopted by same states.
-Rule	Brazil	1992	only	-	Oct	25	 0:00	1:00	D
-Rule	Brazil	1993	only	-	Jan	31	 0:00	0	S
+Rule	Brazil	1992	only	-	Oct	25	 0:00	1:00	S
+Rule	Brazil	1993	only	-	Jan	31	 0:00	0	-
 # Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28)
 # adopted by same states, plus AM.
 # Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22)
@@ -326,13 +315,13 @@ Rule	Brazil	1993	only	-	Jan	31	 0:00	0	S
 # adopted by same states, plus TO.
 # Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13)
 # adds AL, SE.
-Rule	Brazil	1993	1995	-	Oct	Sun>=11	 0:00	1:00	D
-Rule	Brazil	1994	1995	-	Feb	Sun>=15	 0:00	0	S
-Rule	Brazil	1996	only	-	Feb	11	 0:00	0	S
+Rule	Brazil	1993	1995	-	Oct	Sun>=11	 0:00	1:00	S
+Rule	Brazil	1994	1995	-	Feb	Sun>=15	 0:00	0	-
+Rule	Brazil	1996	only	-	Feb	11	 0:00	0	-
 # Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04)
 # adopted by same states, minus AL, SE.
-Rule	Brazil	1996	only	-	Oct	 6	 0:00	1:00	D
-Rule	Brazil	1997	only	-	Feb	16	 0:00	0	S
+Rule	Brazil	1996	only	-	Oct	 6	 0:00	1:00	S
+Rule	Brazil	1997	only	-	Feb	16	 0:00	0	-
 # From Daniel C. Sobral <dcs@gns.com.br> (1998-02-12):
 # In 1997, the DS began on October 6. The stated reason was that
 # because international television networks ignored Brazil's policy on DS,
@@ -347,81 +336,94 @@ Rule	Brazil	1997	only	-	Feb	16	 0:00	0	S
 # Church Net UK (1997-10-02).
 #
 # Decree 2,317 (1997-09-04), adopted by same states.
-Rule	Brazil	1997	only	-	Oct	 6	 0:00	1:00	D
+Rule	Brazil	1997	only	-	Oct	 6	 0:00	1:00	S
 # Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a>
 # (1998-02-10)
-Rule	Brazil	1998	only	-	Mar	 1	 0:00	0	S
+Rule	Brazil	1998	only	-	Mar	 1	 0:00	0	-
 # Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11)
-# adopted by the same states as before,
-# specifies only the 1998-10-11 and 1999-02-21 transitions;
-# after that, these rules are guesses and are quite possibly wrong,
-# but they are more likely than no DST at all.
-Rule	Brazil	1998	max	-	Oct	Sun>=8	 0:00	1:00	D
-Rule	Brazil	1999	max	-	Feb	Sun>=15	 0:00	0	S
+# adopted by the same states as before.
+Rule	Brazil	1998	only	-	Oct	11	 0:00	1:00	S
+Rule	Brazil	1999	only	-	Feb	21	 0:00	0	-
+# Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a>
+# (1999-08-23) adopted by same states.
+# Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30)
+# adds SE, AL, PE, PR, RN, CE, PI, MA and RR.
+# These give only one year's rules.  After that, the rules are guesses
+# and are quite possibly wrong, but are more likely than no DST at all.
+Rule	Brazil	1999	max	-	Oct	Sun>=1	 0:00	1:00	S
+Rule	Brazil	2000	max	-	Feb	lastSun	 0:00	0	-
 
 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 #
 # Fernando de Noronha
 Zone America/Noronha	-2:09:40 -	LMT	1914
-			-2:00	Brazil	F%sT	1990 Jul
-			-2:00	-	FST
+			-2:00	Brazil	FN%sT	1990 Sep 17
+			-2:00	-	FNT
 #
-# Amapa, east Para
+# Amapa (AP), east Para (PA)
 Zone America/Belem	-3:13:56 -	LMT	1914
-			-3:00	Brazil	E%sT	1988 Jul
-			-3:00	-	EST
+			-3:00	Brazil	BR%sT	1988 Sep 12
+			-3:00	-	BRT
 #
-# Maranhao, Piaui, Ceara, Rio Grande do Norte, Paraiba,
-# Pernambuco (except Fernando de Noronha)
+# Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN),
+# Paraiba (PB), Pernambuco (PE) (except Fernando de Noronha)
 Zone America/Fortaleza	-2:34:00 -	LMT	1914
-			-3:00	Brazil	E%sT	1990 Jul
-			-3:00	-	EST
+			-3:00	Brazil	BR%sT	1990 Sep 17
+			-3:00	-	BRT	1999 Sep 30
+			-3:00	Brazil	BR%sT
 #
-# Tocantins
+# Tocantins (TO)
 Zone America/Araguaina	-3:12:48 -	LMT	1914
-			-3:00	Brazil	E%sT	1990 Jul
-			-3:00	-	EST	1995 Jul
-			-3:00	Brazil	E%sT
+			-3:00	Brazil	BR%sT	1990 Sep 17
+			-3:00	-	BRT	1995 Sep 14
+			-3:00	Brazil	BR%sT
 #
-# Alagoas, Sergipe
+# Alagoas (AL), Sergipe (SE)
 Zone America/Maceio	-2:22:52 -	LMT	1914
-			-3:00	Brazil	E%sT	1990 Jul
-			-3:00	-	EST	1995 Jul
-			-3:00	Brazil	E%sT	1996 Jul
-			-3:00	-	EST
-#
-# Bahia, Goias, Distrito Federal, Minas Gerais, Espirito Santo, Rio de Janeiro,
-# Sao Paulo, Parana, Santa Catarina, Rio Grande do Sul
+			-3:00	Brazil	BR%sT	1990 Sep 17
+			-3:00	-	BRT	1995 Oct 13
+			-3:00	Brazil	BR%sT	1996 Sep  4
+			-3:00	-	BRT	1999 Sep 30
+			-3:00	Brazil	BR%sT
+#
+# Bahia (BA), Goias (GO), Distrito Federal (DF), Minas Gerais (MG),
+# Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR),
+# Santa Catarina (SC), Rio Grande do Sul (RS)
 Zone America/Sao_Paulo	-3:06:28 -	LMT	1914
-			-3:00	Brazil	E%sT	1963 Oct 23 00:00
-			-3:00	-	EDT	1964
-			-3:00	Brazil	E%sT
+			-3:00	Brazil	BR%sT	1963 Oct 23 00:00
+			-3:00	1:00	BRST	1964
+			-3:00	Brazil	BR%sT
 #
 # Mato Grosso, Mato Grosso do Sul
 Zone America/Cuiaba	-3:44:20 -	LMT	1914
-			-4:00	Brazil	W%sT	1990 Jul
-			-4:00	-	WST
+			-4:00	Brazil	AM%sT
 #
-# Roraima, west Para, Rondonia
+# west Para (PA), Rondonia (RO)
 Zone America/Porto_Velho -4:15:36 -	LMT	1914
-			-4:00	Brazil	W%sT	1988 Jul
-			-4:00	-	WST
+			-4:00	Brazil	AM%sT	1988 Sep 12
+			-4:00	-	AMT
+#
+# Roraima (RR)
+Zone America/Boa_Vista	-4:02:40 -	LMT	1914
+			-4:00	Brazil	AM%sT	1988 Sep 12
+			-4:00	-	AMT	1999 Sep 30
+			-4:00	Brazil	AM%sT
 #
-# Amazonas
+# Amazonas (AM)
 Zone America/Manaus	-4:00:04 -	LMT	1914
-			-4:00	Brazil	W%sT	1988 Jul
-			-4:00	-	WST	1993 Jul
-			-4:00	Brazil	W%sT	1994 Jul
-			-4:00	-	WST
+			-4:00	Brazil	AM%sT	1988 Sep 12
+			-4:00	-	AMT	1993 Sep 28
+			-4:00	Brazil	AM%sT	1994 Sep 22
+			-4:00	-	AMT
 #
-# Acre
+# Acre (AC)
 # Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too.
 Zone America/Porto_Acre	-4:31:12 -	LMT	1914
-			-5:00	Brazil	A%sT	1988 Jul
-			-5:00	-	AST
+			-5:00	Brazil	AC%sT	1988 Sep 12
+			-5:00	-	ACT
 #
-# Martin Vaz and Trinidade are like America/Noronha.
+# Martin Vaz and Trindade are like America/Noronha.
 
 
 # Chile
@@ -434,17 +436,23 @@ Zone America/Porto_Acre	-4:31:12 -	LMT	1914
 # 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).
+
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-Rule	Chile	1918	only	-	Sep	1	0:00	1:00	S
-Rule	Chile	1919	only	-	Jul	2	0:00	0	-
-Rule	Chile	1927	1931	-	Sep	1	0:00	1:00	S
-Rule	Chile	1928	1932	-	Apr	1	0:00	0	-
+Rule	Chile	1918	only	-	Sep	 1	0:00	1:00	S
+Rule	Chile	1919	only	-	Jul	 2	0:00	0	-
+Rule	Chile	1927	1931	-	Sep	 1	0:00	1:00	S
+Rule	Chile	1928	1932	-	Apr	 1	0:00	0	-
 Rule	Chile	1969	1997	-	Oct	Sun>=9	0:00	1:00	S
-Rule	Chile	1970	max	-	Mar	Sun>=9	0:00	0	-
+Rule	Chile	1970	1998	-	Mar	Sun>=9	0:00	0	-
 Rule	Chile	1998	only	-	Sep	27	0:00	1:00	S
+Rule	Chile	1999	only	-	Apr	 4	0:00	0	-
 Rule	Chile	1999	max	-	Oct	Sun>=9	0:00	1:00	S
+Rule	Chile	2000	max	-	Mar	Sun>=9	0:00	0	-
 # IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14;
-# (1996-09) says 1998-03-08.  Ignore these for now.
+# (1996-09) says 1998-03-08.  Ignore these.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Santiago	-4:42:40 -	LMT	1890
 			-4:42:40 -	SMT	1910	    # Santiago Mean Time
@@ -461,9 +469,10 @@ Zone Pacific/Easter	-7:17:28 -	LMT	1890	    # Mataveri
 
 
 # Colombia
+# Shanks specifies 24:00 for 1992 transition times; go with IATA,
+# as it seems implausible to change clocks at midnight New Year's Eve.
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	CO	1992	only	-	May	 2	0:00	1:00	S
-# Shanks (1995) estimates 1993-04-03 24:00 for this; go with IATA.
 Rule	CO	1992	only	-	Dec	31	0:00	0	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Bogota	-4:56:20 -	LMT	1884 Mar 13
@@ -473,7 +482,7 @@ Zone	America/Bogota	-4:56:20 -	LMT	1884 Mar 13
 # no information; probably like America/Bogota
 
 # Curacao
-# Shanks (1995) says that Bottom and Oranjestad have been at -4:00 since
+# Shanks says that Bottom and Oranjestad have been at -4:00 since
 # standard time was introduced on 1912-03-02; and that Kralendijk and Rincon
 # used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01.
 # This all predates our 1970 cutoff, though.
@@ -527,22 +536,14 @@ Zone	America/Guyana	-3:52:40 -	LMT	1915 Mar	# Georgetown
 			-4:00	-	GYT
 
 # Paraguay
-
-# From Bob Devine (1988-01-28):
-# Paraguay: First day in October to last in March.  Midnight switch??
-# Since 1980.
-
-# From U. S. Naval Observatory (1989-01-19):
-# PARAGUAY            4 H  BEHIND UTC
-# PARAGUAY            3 H  BEHIND UTC    OCT 1, '88-MAR 31, '89
-
-# From Shanks (1991):
+# From Paul Eggert (1999-10-29):
+# Shanks (1999) says that spring transitions are from 01:00 -> 02:00,
+# and autumn transitions are from 00:00 -> 23:00.  Go with earlier
+# editions of Shanks, and with the IATA, who say transitions occur at 00:00.
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-Rule	Para	1975	1978	-	Oct	 1	0:00	1:00	S
+Rule	Para	1975	1988	-	Oct	 1	0:00	1:00	S
 Rule	Para	1975	1978	-	Mar	 1	0:00	0	-
-# Shanks says 1979 was all DST.
-Rule	Para	1980	1991	-	Apr	 1	0:00	0	-
-Rule	Para	1980	1988	-	Oct	 1	0:00	1:00	S
+Rule	Para	1979	1991	-	Apr	 1	0:00	0	-
 Rule	Para	1989	only	-	Oct	22	0:00	1:00	S
 Rule	Para	1990	only	-	Oct	 1	0:00	1:00	S
 Rule	Para	1991	only	-	Oct	 6	0:00	1:00	S
@@ -551,9 +552,16 @@ Rule	Para	1992	only	-	Oct	 5	0:00	1:00	S
 Rule	Para	1993	only	-	Mar	31	0:00	0	-
 Rule	Para	1993	1995	-	Oct	 1	0:00	1:00	S
 Rule	Para	1994	1995	-	Feb	lastSun	0:00	0	-
-Rule	Para	1996	1998	-	Mar	 1	0:00	0	-
-Rule	Para	1996	max	-	Oct	Sun>=1	0:00	1:00	S
+Rule	Para	1996	only	-	Mar	 1	0:00	0	-
+# IATA SSIM (1997-09) says Mar 1; go with Shanks.
+Rule	Para	1997	only	-	Feb	lastSun	0:00	0	-
+Rule	Para	1998	only	-	Mar	 1	0:00	0	-
+Rule	Para	1996	1998	-	Oct	Sun>=1	0:00	1:00	S
+# IATA SSIM (1999-02) says lastSat, not lastSun; (1999-09) reports no date;
+# go with Shanks.
 Rule	Para	1999	max	-	Feb	lastSun	0:00	0	-
+# IATA SSIM (2000-02) says 1999-10-10.
+Rule	Para	1999	max	-	Oct	Sun>=8	0:00	1:00	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Asuncion	-3:50:40 -	LMT	1890
 			-3:50:40 -	AMT	1931 Oct 10 # Asuncion Mean Time
@@ -571,8 +579,9 @@ Rule	Peru	1987	only	-	Jan	 1	0:00	1:00	S
 Rule	Peru	1987	only	-	Apr	 1	0:00	0	-
 Rule	Peru	1990	only	-	Jan	 1	0:00	1:00	S
 Rule	Peru	1990	only	-	Apr	 1	0:00	0	-
-Rule	Peru	1993	only	-	Jan	 1	0:00	1:00	S
-Rule	Peru	1993	only	-	Apr	 1	0:00	0	-
+# IATA is ambiguous for 1993/1995; go with Shanks.
+Rule	Peru	1994	only	-	Jan	 1	0:00	1:00	S
+Rule	Peru	1994	only	-	Apr	 1	0:00	0	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Lima	-5:08:12 -	LMT	1890
 			-5:09	-	LMT	1908 Jul 28 # Lima Mean Time
@@ -584,7 +593,7 @@ Zone Atlantic/South_Georgia -2:26:08 -	LMT	1890		# Grytviken
 			-2:00	-	GST	# South Georgia Time
 
 # South Sandwich Is
-# uninhabited
+# uninhabited; scientific personnel have wintered
 
 # Suriname
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
@@ -603,7 +612,7 @@ Zone America/Port_of_Spain -4:06:04 -	LMT	1912 Mar 2
 # Uruguay
 # From Paul Eggert <eggert@twinsun.com> (1993-11-18):
 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
-# From Shanks (1991):
+# From Shanks:
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 # Whitman gives 1923 Oct 1; go with Shanks.
 Rule	Uruguay	1923	only	-	Oct	 2	 0:00	0:30	HS
@@ -645,10 +654,10 @@ Rule	Uruguay	1988	only	-	Mar	14	 0:00	0	-
 Rule	Uruguay	1988	only	-	Dec	11	 0:00	1:00	S
 Rule	Uruguay	1989	only	-	Mar	12	 0:00	0	-
 Rule	Uruguay	1989	only	-	Oct	29	 0:00	1:00	S
+# Shanks says no DST was observed in 1990/1 and 1991/2,
+# and that 1992/3's DST was from 10-25 to 03-01.  Go with IATA.
 Rule	Uruguay	1990	1992	-	Mar	Sun>=1	 0:00	0	-
 Rule	Uruguay	1990	1991	-	Oct	Sun>=21	 0:00	1:00	S
-# Shanks's 4th edition (1995) says no DST was observed in 1990/1 and 1991/2,
-# and that 1992/3's DST was from 10-25 to 03-01.  Go with IATA.
 Rule	Uruguay	1992	only	-	Oct	18	 0:00	1:00	S
 Rule	Uruguay	1993	only	-	Feb	28	 0:00	0	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]