Update to the latest version from the vendor branch. These files are

now identical with the distributed versions, which may cause some
abbreviations to change for people in obscure zones.  (The abbreviations
can be changed again if need be.)  It also changes the abbreviation
of Central European Time to `CET' from its previous value of `MET'
(a curious German-English hybrid).  Finally, we have finally rid
ourselves of those nasty ZONE-DESCR comments, which were a maintenance
nightmare, in favor of the new zone.tab file.  We are not using the
distribution's iso3166.tab file because we have our own list.

Obtained from: Arthur David Olson; ftp://elsie.nci.nih.gov

1 files changed, 180 insertions, 214 deletions

diff --git a/share/zoneinfo/southamerica b/share/zoneinfo/southamerica
index dd44aa8..cd8c84e 100644
--- a/share/zoneinfo/southamerica
+++ b/share/zoneinfo/southamerica
@@ -1,33 +1,35 @@
-# @(#)southamerica	7.12
+# @(#)southamerica	7.14
 
 # 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> (November 18, 1993):
+# From Paul Eggert <eggert@twinsun.com> (1996-09-03):
 # A good source for time zone historical data outside the U.S. is
 # Thomas G. Shanks, The International Atlas (3rd edition),
 # San Diego: ACS Publications, Inc. (1991).
 # Except where otherwise noted, it is the source for the data below.
 #
-# I invented the abbreviations marked `*' in the following table;
-# the rest are from earlier versions of this file, or from other sources.
-# Some of these are just plausible excuses for common English abbreviations.
+# 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 South America (conflicts with -5:00)
-#	-3:00	ARST	ARDT	Argentina
-#	-4:00	AST	ADT	Andes*, Antilles*, Asuncion*, Atlantic
-#	-4:00	CST	CDT	Chile (conflicts with -6:00)
+#	-3:00	EST	EDT	Eastern Brazil
 #	-4:00	WST	WDT	Western Brazil
-#	-5:00	AST	ADT	Acre (conflicts with -4:00)
-#	-5:00	EST	EDT	Eastern, Ecuador*
-#	-6:00	CST	CDT	Archipelago of Columbus*, Central
-#	-7:00	MST	MDT	Mataveri*, Mountain
+#	-4:00	AST	ADT	Atlantic
+#	-5:00	AST	ADT	Acre
 #
-# See the `africa' file for Zone naming conventions.
+# See the `africa' file for time zone naming and abbreviation conventions.
+# 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).
+#	I suggest the use of _Summer time_ instead of the more cumbersome
+#	_daylight-saving time_.  _Summer time_ seems to be in general use
+#	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
@@ -43,104 +45,98 @@
 
 # Argentina
 
-# From Bob Devine (January 28, 1988):
+# From Bob Devine (1988-01-28):
 # Argentina: first Sunday in October to first Sunday in April since 1976.
 # Double Summer time from 1969 to 1974.  Switches at midnight.
 
-# From U. S. Naval Observatory (January 19, 19889):
+# From U. S. Naval Observatory (1988-01-199):
 # ARGENTINA           3 H BEHIND   UTC
 
-# From Hernan G. Otero <hernan@isoft.com.ar> (June 26, 1995):
+# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
 # I am sending modifications to the Argentinian time zone table...
 # AR was chosen because they are the ISO letters that represent Argentina.
 
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-Rule	Arg	1930	only	-	Dec	 1	0:00	1:00	D
-Rule	Arg	1931	only	-	Apr	 1	0:00	0	S
-Rule	Arg	1931	only	-	Oct	15	0:00	1:00	D
-Rule	Arg	1932	1940	-	Mar	 1	0:00	0	S
-Rule	Arg	1932	1939	-	Nov	 1	0:00	1:00	D
-Rule	Arg	1940	only	-	Jul	 1	0:00	1:00	D
-Rule	Arg	1941	only	-	Jun	15	0:00	0	S
-Rule	Arg	1941	only	-	Oct	15	0:00	1:00	D
-Rule	Arg	1943	only	-	Aug	 1	0:00	0	S
-Rule	Arg	1943	only	-	Oct	15	0:00	1:00	D
-Rule	Arg	1946	only	-	Mar	 1	0:00	0	S
-Rule	Arg	1946	only	-	Oct	 1	0:00	1:00	D
-Rule	Arg	1963	only	-	Oct	 1	0:00	0	S
-Rule	Arg	1963	only	-	Dec	15	0:00	1:00	D
-Rule	Arg	1964	1966	-	Mar	 1	0:00	0	S
-Rule	Arg	1964	1966	-	Oct	15	0:00	1:00	D
-Rule	Arg	1967	only	-	Apr	 1	0:00	0	S
-Rule	Arg	1967	1968	-	Oct	Sun<=7	0:00	1:00	D
-Rule	Arg	1968	1969	-	Apr	Sun<=7	0:00	0	S
-Rule	Arg	1974	only	-	Jan	23	0:00	1:00	D
-Rule	Arg	1974	only	-	May	 1	0:00	0	S
-Rule	Arg	1974	1976	-	Oct	Sun<=7	0:00	1:00	D
-Rule	Arg	1975	1977	-	Apr	Sun<=7	0:00	0	S
-Rule	Arg	1985	only	-	Nov	 2	0:00	1:00	D
-Rule	Arg	1986	only	-	Mar	14	0:00	0	S
-Rule	Arg	1986	1987	-	Oct	25	0:00	1:00	D
-Rule	Arg	1987	only	-	Feb	13	0:00	0	S
-Rule	Arg	1988	only	-	Feb	 7	0:00	0	S
-Rule	Arg	1988	only	-	Dec	 1	0:00	1:00	D
+Rule	Arg	1930	only	-	Dec	 1	0:00	1:00	S
+Rule	Arg	1931	only	-	Apr	 1	0:00	0	-
+Rule	Arg	1931	only	-	Oct	15	0:00	1:00	S
+Rule	Arg	1932	1940	-	Mar	 1	0:00	0	-
+Rule	Arg	1932	1939	-	Nov	 1	0:00	1:00	S
+Rule	Arg	1940	only	-	Jul	 1	0:00	1:00	S
+Rule	Arg	1941	only	-	Jun	15	0:00	0	-
+Rule	Arg	1941	only	-	Oct	15	0:00	1:00	S
+Rule	Arg	1943	only	-	Aug	 1	0:00	0	-
+Rule	Arg	1943	only	-	Oct	15	0:00	1:00	S
+Rule	Arg	1946	only	-	Mar	 1	0:00	0	-
+Rule	Arg	1946	only	-	Oct	 1	0:00	1:00	S
+Rule	Arg	1963	only	-	Oct	 1	0:00	0	-
+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	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	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
+Rule	Arg	1987	only	-	Feb	13	0:00	0	-
+Rule	Arg	1988	only	-	Feb	 7	0:00	0	-
+Rule	Arg	1988	only	-	Dec	 1	0:00	1:00	S
 #
-# From Hernan G. Otero <hernan@isoft.com.ar> (June 26, 1995):
+# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
 # These corrections were contributed by InterSoft Argentina S.A.,
 # obtaining the data from the:
 # Talleres de Hidrografia Naval Argentina
 # (Argentinian Naval Hydrography Institute)
 #
 # Shanks gives 1989 Mar 16 and stops after 1990 Mar 4; go with Otero.
-Rule	Arg	1989	1993	-	Mar	Sun>=1	0:00	0	S
-Rule	Arg	1989	1992	-	Oct	Sun>=15	0:00	1:00	D
+Rule	Arg	1989	1993	-	Mar	Sun>=1	0:00	0	-
+Rule	Arg	1989	1992	-	Oct	Sun>=15	0:00	1:00	S
 #
-# From Hernan G. Otero <hernan@isoft.com.ar> (June 26, 1995):
+# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
 # From this moment on, the law that mandated the daylight saving
 # time corrections was derogated and no more modifications
 # to the time zones (for daylight saving) are now made.
 #
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Buenos_Aires -3:53:48 -	LMT	1894 Nov
-			-4:17	-	CMT	1920 May    # Cordoba Mean Time
-			-4:00	-	AST	1930 Dec
-			-4:00	Arg	A%sT	1969 Oct 5
+			-4:16:44 -	CMT	1920 May    # Cordoba Mean Time
+			-4:00	-	ART	1930 Dec
+			-4:00	Arg	AR%sT	1969 Oct 5
 			-3:00	Arg	AR%sT
-# ZONE-DESCR America Buenos_Aires Argentina All points
 
 # Aruba
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Aruba	-4:40:24 -	LMT	1912 Feb 12	# Oranjestad
-			-4:30	-	NAST	1965	# Netherlands Antilles
+			-4:30	-	ANT	1965 # Netherlands Antilles Time
 			-4:00	-	AST
 
-# ZONE-DESCR America Aruba All points
-# what to do about overseas terrirories...?
-
 # Bolivia
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	America/La_Paz	-4:32:36 -	LMT	1890
-			-4:33	-	LPMT	1931 Oct 15 # La Paz Mean Time
-			-4:33	1:00	LPDT	1932 Mar 21
-			-4:00	-	AST
-
-# ZONE-DESCR America La_Paz Bolivia All points
+			-4:32:36 -	LPMT	1931 Oct 15 # La Paz Mean Time
+			-4:32:36 1:00	BOST	1932 Mar 21 # Bolivia ST
+			-4:00	-	BOT	# Bolivia Time
 
 # Brazil
 
 # From Guy Harris:
-# The OAG lists October 25, 1987 and February 12, 1988 as the starting and
+# The OAG lists 1987-10-25 and 1988-02-12 as the starting and
 # ending dates, giving them as "estimated date(s) based on previous year".  We
 # infer a rule here from one example, always a dangerous practice....  Yes,
 # they really do switch on Saturday, according to the OAG.
 # "[America/Porto_Acre]" is for the Territory of Acre;
 # "[America/Noronha]" is for Fernando De Noronha.
 
-# From Bob Devine (January 28, 1988):
+# From Bob Devine (1988-01-28):
 # The only information I found is that there was no DST up to 1985.
 # But there was some before 1952!
 
-# From U. S. Naval Observatory (January 16, 1989):
+# From U. S. Naval Observatory (1989-01-16):
 # BRAZIL     WEST     5 H  BEHIND UTC    TERRITORY OF ACRE
 # BRAZIL     WEST     4 H  BEHIND UTC    ACRE OCT 23, '88-FEB 11,
 # BRAZIL                                 '89 (ESTIMATED)
@@ -159,7 +155,7 @@ Zone	America/La_Paz	-4:32:36 -	LMT	1890
 # BRAZIL                                 (ESTIMATED)
 # BRAZIL              3 H  BEHIND UTC    FOR MOST MAJOR AIRPORTS.
 
-# From Paul Eggert <eggert@twinsun.com> (November 18, 1993):
+# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
 # The mayor of Rio recently attempted to change the time zone rules
 # just in his city, in order to leave more summer time for the tourist trade.
 # The rule change lasted only part of the day;
@@ -170,26 +166,26 @@ Zone	America/La_Paz	-4:32:36 -	LMT	1890
 # about time zone changes after 1990 Feb 11.
 
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-Rule	Brazil	1931	only	-	Oct	 3	11:00	1	D
+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	D
-Rule	Brazil	1949	1952	-	Dec	 1	 0:00	1	D
+Rule	Brazil	1932	only	-	Oct	 3	 0:00	1:00	D
+Rule	Brazil	1949	1952	-	Dec	 1	 0:00	1:00	D
 Rule	Brazil	1950	only	-	Apr	16	 0:00	0	S
 Rule	Brazil	1951	1953	-	Apr	 1	 0:00	0	S
-Rule	Brazil	1963	only	-	Dec	 9	 0:00	1	D
+Rule	Brazil	1963	only	-	Dec	 9	 0:00	1:00	D
 Rule	Brazil	1964	only	-	Mar	 1	 0:00	0	S
-Rule	Brazil	1965	only	-	Jan	31	 0:00	1	D
+Rule	Brazil	1965	only	-	Jan	31	 0:00	1:00	D
 Rule	Brazil	1965	only	-	Apr	 1	 0:00	0	S
-Rule	Brazil	1965	only	-	Dec	 1	 0:00	1	D
+Rule	Brazil	1965	only	-	Dec	 1	 0:00	1:00	D
 Rule	Brazil	1966	1968	-	Mar	 1	 0:00	0	S
-Rule	Brazil	1966	1967	-	Nov	 1	 0:00	1	D
-Rule	Brazil	1985	only	-	Nov	 2	 0:00	1	D
+Rule	Brazil	1966	1967	-	Nov	 1	 0:00	1:00	D
+Rule	Brazil	1985	only	-	Nov	 2	 0:00	1:00	D
 Rule	Brazil	1986	only	-	Mar	15	 0:00	0	S
-Rule	Brazil	1986	1987	-	Oct	Sat<=28	 0:00	1	D
+Rule	Brazil	1986	1987	-	Oct	Sat<=28	 0:00	1:00	D
 Rule	Brazil	1987	only	-	Feb	14	 0:00	0	S
 Rule	Brazil	1988	only	-	Feb	 7	 0:00	0	S
 Rule	Brazil	1989	only	-	Jan	22	 0:00	0	S
-Rule	Brazil	1988	max	-	Oct	Sun>=15	 0:00	1	D
+Rule	Brazil	1988	max	-	Oct	Sun>=15	 0:00	1:00	D
 Rule	Brazil	1990	max	-	Feb	Sun>=8	 0:00	0	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Noronha	-2:09:40 -	LMT	1914
@@ -207,10 +203,6 @@ Zone America/Porto_Acre	-4:31:12 -	LMT	1914
 #
 # Martin Vaz and Trinidade are like America/Noronha.
 
-# ZONE-DESCR America Noronha Brazil Fernando De Noronha
-# ZONE-DESCR America Sao_Paulo Brazil Eastern zone
-# ZONE-DESCR America Manaus Brazil Western zone
-# ZONE-DESCR America Porto_Acre Brazil Territory of Acre
 
 # Chile
 
@@ -219,147 +211,128 @@ Zone America/Porto_Acre	-4:31:12 -	LMT	1914
 # of October....  The law is the same for March and October.
 
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-Rule	Chile	1918	only	-	Sep	1	0:00	1:00	D
-Rule	Chile	1919	only	-	Jul	2	0:00	0	S
-Rule	Chile	1927	1931	-	Sep	1	0:00	1:00	D
-Rule	Chile	1928	1932	-	Apr	1	0:00	0	S
-Rule	Chile	1969	max	-	Oct	Sun>=9	0:00	1:00	D
-Rule	Chile	1970	max	-	Mar	Sun>=9	0:00	0	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	1969	max	-	Oct	Sun>=9	0:00	1:00	S
+Rule	Chile	1970	max	-	Mar	Sun>=9	0:00	0	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Santiago	-4:42:40 -	LMT	1890
-			-4:43	-	SMT	1910	    # Santiago Mean Time
-			-5:00	Chile	C%sT	1932 Sep
-			-4:00	Chile	C%sT
+			-4:42:40 -	SMT	1910	    # Santiago Mean Time
+			-5:00	Chile	CL%sT	1932 Sep    # Chile Time
+			-4:00	Chile	CL%sT
 Zone Pacific/Easter	-7:17:28 -	LMT	1890	    # Mataveri
-			-7:17	-	MMT	1932 Sep    # Mataveri Mean Time
-			-7:00	Chile	M%sT	1982 Mar 14
-			-6:00	Chile	C%sT
+			-7:17:28 -	MMT	1932 Sep    # Mataveri Mean Time
+			-7:00	Chile	EAS%sT	1982 Mar 14 # Easter I Time
+			-6:00	Chile	EAS%sT
 #
 # Whitman says Juan Fernandez Is are like America/Santiago.
 # San Ambrosio, San Felix
 # no information; probably like America/Santiago
 
-# ZONE-DESCR America Santiago Chile All points
-# ZONE-DESCR Pacific Easter Easter_Island All points
 
 # Colombia
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Bogota	-4:56:20 -	LMT	1884 Mar 13
-			-4:56	-	BMT	1914 Nov 23 # Bogota Mean Time
-			-5:00	-	EST
+			-4:56:20 -	BMT	1914 Nov 23 # Bogota Mean Time
+			-5:00	-	COT	# Colombia Time
 # Malpelo, Providencia, San Andres
 # no information; probably like America/Bogota
 
-# ZONE-DESCR America Bogota Colombia All points
-
 # Curacao
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Curacao	-4:35:44 -	LMT	1912 Feb 12	# Willemstad
-			-4:30	-	NAST	1965	# Netherlands Antilles
+			-4:30	-	ANT	1965 # Netherlands Antilles Time
 			-4:00	-	AST
 
-# ZONE-DESCR America Curacao Curacao All points
-
 # Ecuador
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Guayaquil	-5:19:20 -	LMT	1890
-			-5:14	-	QMT	1931 # Quito Mean Time
-			-5:00	-	EST
+			-5:14:00 -	QMT	1931 # Quito Mean Time
+			-5:00	-	ECT	     # Ecuador Time
 Zone Pacific/Galapagos	-5:58:24 -	LMT	1931 # Puerto Baquerizo Moreno
-			-5:00	-	EST	1986
-			-6:00	-	CST
-
-# ZONE-DESCR America Guayaquil Ecuador All points except:
-# ZONE-DESCR Pacific Galapagos Ecuador Galapagos Islands
+			-5:00	-	ECT	1986
+			-6:00	-	GALT	     # Galapagos Time
 
 # Falklands
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-Rule	Falk	1937	1938	-	Sep	lastSun	0:00	1:00	D
-Rule	Falk	1938	1942	-	Mar	Sun>=19	0:00	0	S
-Rule	Falk	1939	only	-	Oct	1	0:00	1:00	D
-Rule	Falk	1940	1942	-	Sep	lastSun	0:00	1:00	D
-Rule	Falk	1943	only	-	Jan	1	0:00	0	S
-Rule	Falk	1983	only	-	Sep	lastSun	0:00	1:00	D
-Rule	Falk	1984	1985	-	Apr	lastSun	0:00	0	S
-Rule	Falk	1984	only	-	Sep	16	0:00	1:00	D
-Rule	Falk	1985	max	-	Sep	Sun>=9	0:00	1:00	D
-Rule	Falk	1986	max	-	Apr	Sun>=16	0:00	0	S
+Rule	Falk	1937	1938	-	Sep	lastSun	0:00	1:00	S
+Rule	Falk	1938	1942	-	Mar	Sun>=19	0:00	0	-
+Rule	Falk	1939	only	-	Oct	1	0:00	1:00	S
+Rule	Falk	1940	1942	-	Sep	lastSun	0:00	1:00	S
+Rule	Falk	1943	only	-	Jan	1	0:00	0	-
+Rule	Falk	1983	only	-	Sep	lastSun	0:00	1:00	S
+Rule	Falk	1984	1985	-	Apr	lastSun	0:00	0	-
+Rule	Falk	1984	only	-	Sep	16	0:00	1:00	S
+Rule	Falk	1985	max	-	Sep	Sun>=9	0:00	1:00	S
+Rule	Falk	1986	max	-	Apr	Sun>=16	0:00	0	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone Atlantic/Stanley	-3:51:24 -	LMT	1890
-			-3:51	-	SMT	1912 Mar 12  # Stanley Mean Time
-			-4:00	Falk	A%sT	1983 May
-			-3:00	Falk	E%sT	1985 Sep 15
-			-4:00	Falk	A%sT
-
-# ZONE-DESCR Atlantic Stanley Falkland_Islands All points
+			-3:51:24 -	SMT	1912 Mar 12  # Stanley Mean Time
+			-4:00	Falk	FK%sT	1983 May     # Falkland Is Time
+			-3:00	Falk	FK%sT	1985 Sep 15
+			-4:00	Falk	FK%sT
 
 # French Guiana
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Cayenne	-3:29:20 -	LMT	1911 Jul
-			-4:00	-	AST	1967 Oct
-			-3:00	-	EST
-
-# ZONE-DESCR America Cayenne French_Guiana All points
+			-4:00	-	GFT	1967 Oct # French Guiana Time
+			-3:00	-	GFT
 
 # Guyana
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Guyana	-3:52:40 -	LMT	1915 Mar	# Georgetown
-			-3:45	-	BGST	1975 Jul 31  # British Guiana ST
-			-3:00	-	EST
+			-3:45	-	GBGT	1966 May 26 # Br Guiana Time
+			-3:45	-	GYT	1975 Jul 31 # Guyana Time
+			-3:00	-	GYT
 
-# ZONE-DESCR America Guyana Guyana All points
 
 # Paraguay
 
-# From Bob Devine (January 28, 1988):
+# From Bob Devine (1988-01-28):
 # Paraguay: First day in October to last in March.  Midnight switch??
 # Since 1980.
 
-# From U. S. Naval Observatory (January 19, 1989):
+# 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):
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-Rule	Para	1975	1978	-	Oct	 1	0:00	1:00	D
-Rule	Para	1975	1978	-	Mar	 1	0:00	0	S
+Rule	Para	1975	1978	-	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	max	-	Apr	 1	0:00	0	S
-Rule	Para	1980	1988	-	Oct	 1	0:00	1:00	D
-Rule	Para	1989	only	-	Oct	22	0:00	1:00	D
-Rule	Para	1990	max	-	Oct	 1	0:00	1:00	D
+Rule	Para	1980	max	-	Apr	 1	0:00	0	-
+Rule	Para	1980	1988	-	Oct	 1	0:00	1:00	S
+Rule	Para	1989	only	-	Oct	22	0:00	1:00	S
+Rule	Para	1990	max	-	Oct	 1	0:00	1:00	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Asuncion	-3:50:40 -	LMT	1890
-			-3:51	-	AMT	1931 Oct 10 # Asuncion Mean Time
-			-4:00	-	AST	1972 Oct
-			-3:00	-	EST	1974 Apr
-			-4:00	Para	A%sT
-
-# ZONE-DESCR America Asuncion Paraguay All points
+			-3:50:40 -	AMT	1931 Oct 10 # Asuncion Mean Time
+			-4:00	-	PYT	1972 Oct # Paraguay Time
+			-3:00	-	PYT	1974 Apr
+			-4:00	Para	PY%sT
 
 # Peru
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
-Rule	Peru	1938	only	-	Jan	 1	0:00	1:00	D
-Rule	Peru	1938	only	-	Apr	 1	0:00	0	S
-Rule	Peru	1938	1939	-	Sep	lastSun	0:00	1:00	D
-Rule	Peru	1939	1940	-	Mar	Sun>=24	0:00	0	S
-Rule	Peru	1987	only	-	Jan	 1	0:00	1:00	D
-Rule	Peru	1987	only	-	Apr	 1	0:00	0	S
-Rule	Peru	1990	only	-	Jan	 1	0:00	1:00	D
-Rule	Peru	1990	only	-	Apr	 1	0:00	0	S
+Rule	Peru	1938	only	-	Jan	 1	0:00	1:00	S
+Rule	Peru	1938	only	-	Apr	 1	0:00	0	-
+Rule	Peru	1938	1939	-	Sep	lastSun	0:00	1:00	S
+Rule	Peru	1939	1940	-	Mar	Sun>=24	0:00	0	-
+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	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Lima	-5:08:12 -	LMT	1890
-			-5:09	-	LMT	1908 Jul 28
-			-5:00	Peru	E%sT
-
-# ZONE-DESCR America Lima Peru All points
+			-5:09	-	LMT	1908 Jul 28 # Lima Mean Time
+			-5:00	Peru	PE%sT	# Peru Time
 
 # South Georgia
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone Atlantic/South_Georgia -2:26:08 -	LMT	1890		# Grytviken
-			-2:00	-	FST
-
-# ZONE-DESCR Atlantic South_Georgia South_Georgia All points
+			-2:00	-	GST	# South Georgia Time
 
 # South Sandwich Is
 # uninhabited
@@ -369,77 +342,70 @@ Zone Atlantic/South_Georgia -2:26:08 -	LMT	1890		# Grytviken
 Zone America/Paramaribo	-3:40:40 -	LMT	1911
 			-3:40:52 -	PMT	1935     # Paramaribo Mean Time
 			-3:40:36 -	PMT	1945 Oct # The capital moved?
-			-3:30	-	DGST	1984 Oct # Dutch Guiana Std Time
-			-3:00	-	EST
-
-# ZONE-DESCR America Paramaibo Suriname All points
+			-3:30	-	NEGT	1975 Nov 20 # Dutch Guiana Time
+			-3:30	-	SRT	1984 Oct # Suriname Time
+			-3:00	-	SRT
 
 # Trinidad and Tobago
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Port_of_Spain -4:06:04 -	LMT	1912 Mar 2
 			-4:00	-	AST
 
-# ZONE-DESCR America Port_of_Spain Trinidad_and_Tobago All points
-
 # Uruguay
-# From Paul Eggert <eggert@twinsun.com> (November 18, 1993):
+# From Paul Eggert <eggert@twinsun.com> (1993-11-18):
 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
 # From Shanks (1991):
 # 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	HD
-Rule	Uruguay	1924	1926	-	Apr	 1	 0:00	0	S
-Rule	Uruguay	1924	1925	-	Oct	 1	 0:00	0:30	HD
-Rule	Uruguay	1933	1935	-	Oct	lastSun	 0:00	0:30	HD
+Rule	Uruguay	1923	only	-	Oct	 2	 0:00	0:30	HS
+Rule	Uruguay	1924	1926	-	Apr	 1	 0:00	0	-
+Rule	Uruguay	1924	1925	-	Oct	 1	 0:00	0:30	HS
+Rule	Uruguay	1933	1935	-	Oct	lastSun	 0:00	0:30	HS
 # Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
-Rule	Uruguay	1934	1936	-	Mar	Sat>=25	23:30s	0	S
-Rule	Uruguay	1936	only	-	Nov	 1	 0:00	0:30	HD
-Rule	Uruguay	1937	1941	-	Mar	lastSun	 0:00	0	S
+Rule	Uruguay	1934	1936	-	Mar	Sat>=25	23:30s	0	-
+Rule	Uruguay	1936	only	-	Nov	 1	 0:00	0:30	HS
+Rule	Uruguay	1937	1941	-	Mar	lastSun	 0:00	0	-
 # Whitman gives 1937 Oct 3; go with Shanks.
-Rule	Uruguay	1937	1940	-	Oct	lastSun	 0:00	0:30	HD
+Rule	Uruguay	1937	1940	-	Oct	lastSun	 0:00	0:30	HS
 # Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
 # and 1943 Apr 13 ``to present time''; go with Shanks.
-Rule	Uruguay	1941	only	-	Aug	 1	 0:00	0	S
-Rule	Uruguay	1942	only	-	Jan	 1	 0:00	0:30	HD
-Rule	Uruguay	1942	only	-	Dec	14	 0:00	1:00	D
-Rule	Uruguay	1943	only	-	Mar	14	 0:00	0	S
-Rule	Uruguay	1959	only	-	May	24	 0:00	1:00	D
-Rule	Uruguay	1959	only	-	Nov	15	 0:00	0	S
-Rule	Uruguay	1960	only	-	Jan	17	 0:00	1:00	D
-Rule	Uruguay	1960	only	-	Mar	 6	 0:00	0	S
-Rule	Uruguay	1965	1967	-	Apr	Sun>=1	 0:00	1:00	D
-Rule	Uruguay	1965	only	-	Sep	26	 0:00	0	S
-Rule	Uruguay	1966	1967	-	Oct	31	 0:00	0	S
-Rule	Uruguay	1968	1970	-	May	27	 0:00	0:30	HD
-Rule	Uruguay	1968	1970	-	Dec	 2	 0:00	0	S
-Rule	Uruguay	1972	only	-	Apr	24	 0:00	1:00	D
-Rule	Uruguay	1972	only	-	Aug	15	 0:00	0	S
-Rule	Uruguay	1974	only	-	Mar	10	 0:00	0:30	HD
-Rule	Uruguay	1974	only	-	Dec	22	 0:00	1:00	D
-Rule	Uruguay	1976	only	-	Oct	 1	 0:00	0	S
-Rule	Uruguay	1977	only	-	Dec	 4	 0:00	1:00	D
-Rule	Uruguay	1978	only	-	Apr	 1	 0:00	0	S
-Rule	Uruguay	1979	only	-	Oct	 1	 0:00	1:00	D
-Rule	Uruguay	1980	only	-	May	 1	 0:00	0	S
-Rule	Uruguay	1987	only	-	Dec	14	 0:00	1:00	D
-Rule	Uruguay	1988	only	-	Mar	14	 0:00	0	S
-Rule	Uruguay	1988	only	-	Dec	11	 0:00	1:00	D
-Rule	Uruguay	1989	only	-	Mar	12	 0:00	0	S
-Rule	Uruguay	1989	only	-	Oct	29	 0:00	1:00	D
-Rule	Uruguay	1990	only	-	Mar	 4	 0:00	0	S
+Rule	Uruguay	1941	only	-	Aug	 1	 0:00	0	-
+Rule	Uruguay	1942	only	-	Jan	 1	 0:00	0:30	HS
+Rule	Uruguay	1942	only	-	Dec	14	 0:00	1:00	S
+Rule	Uruguay	1943	only	-	Mar	14	 0:00	0	-
+Rule	Uruguay	1959	only	-	May	24	 0:00	1:00	S
+Rule	Uruguay	1959	only	-	Nov	15	 0:00	0	-
+Rule	Uruguay	1960	only	-	Jan	17	 0:00	1:00	S
+Rule	Uruguay	1960	only	-	Mar	 6	 0:00	0	-
+Rule	Uruguay	1965	1967	-	Apr	Sun>=1	 0:00	1:00	S
+Rule	Uruguay	1965	only	-	Sep	26	 0:00	0	-
+Rule	Uruguay	1966	1967	-	Oct	31	 0:00	0	-
+Rule	Uruguay	1968	1970	-	May	27	 0:00	0:30	HS
+Rule	Uruguay	1968	1970	-	Dec	 2	 0:00	0	-
+Rule	Uruguay	1972	only	-	Apr	24	 0:00	1:00	S
+Rule	Uruguay	1972	only	-	Aug	15	 0:00	0	-
+Rule	Uruguay	1974	only	-	Mar	10	 0:00	0:30	HS
+Rule	Uruguay	1974	only	-	Dec	22	 0:00	1:00	S
+Rule	Uruguay	1976	only	-	Oct	 1	 0:00	0	-
+Rule	Uruguay	1977	only	-	Dec	 4	 0:00	1:00	S
+Rule	Uruguay	1978	only	-	Apr	 1	 0:00	0	-
+Rule	Uruguay	1979	only	-	Oct	 1	 0:00	1:00	S
+Rule	Uruguay	1980	only	-	May	 1	 0:00	0	-
+Rule	Uruguay	1987	only	-	Dec	14	 0:00	1:00	S
+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
+Rule	Uruguay	1990	only	-	Mar	 4	 0:00	0	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Montevideo	-3:44:44 -	LMT	1898 Jun 28
-			-3:45	-	MMT	1920 May  1	# Montevideo MT
-			-3:30	Uruguay	U%sT	1942 Dec 14	# Uruguay ST
-			-3:00	Uruguay	E%sT
-
-# ZONE-DESCR America Montevideo Uruguay All points
+			-3:44:44 -	MMT	1920 May  1	# Montevideo MT
+			-3:30	Uruguay	UY%sT	1942 Dec 14	# Uruguay Time
+			-3:00	Uruguay	UY%sT
 
 # Venezuela
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	America/Caracas	-4:27:44 -	LMT	1890
-			-4:28	-	CMT	1912 Feb 12  # Caracas Mean Time
-			-4:30	-	VZT	1965		# Venezuela Time
-			-4:00	-	AST
-
-# ZONE-DESCR America Caracas Venezuela All points
+			-4:27:44 -	CMT	1912 Feb 12  # Caracas Mean Time
+			-4:30	-	VET	1965	     # Venezuela Time
+			-4:00	-	VET