proposed tz patch for Argentine daylight saving last summer

[Paul Eggert]

Here's a proposed patch to reflect an error in the current tz data
that was reported by Fabian L. Arce Jofre on April 4.  Last summer,
Argentina observed daylight saving time, but it didn't adjust its
clocks because it changed the standard-time UTC offset during the
period while it was observing DST.  (Isn't politics wonderful?)

The current tz data has the correct Argentine wall clock values, but
has incorrect values for the the tm_isdst flag and for the time zone
name for the period 1999-10-03 to 2000-03-05.

===================================================================
RCS file: RCS/southamerica,v
retrieving revision 2000.3
retrieving revision 2000.3.0.1
diff -pu -r2000.3 -r2000.3.0.1
--- southamerica	2000/03/04 15:31:08	2000.3
+++ southamerica	2000/04/19 05:36:52	2000.3.0.1
@@ -111,24 +111,31 @@ Rule	Arg	1989	1992	-	Oct	Sun>=15	0:00	1:
 # 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 the International Date Line.
+Rule	Arg	1999	only	-	Oct	Sun>=1	0:00	1:00	S
+Rule	Arg	2000	only	-	Mar	Sun>=1	0:00	0	-
 #
 # 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.
 #
+# From Fabian L. Arce Jofre <farcejofre at bigfoot.com> (2000-04-04):
+# The law that claimed DST for Argentina was derogated by President Fernando
+# de la Rua on March 2, 2000, because it would make people spend more energy
+# in the winter time, rather than less.  The change took effect on March 3.
+#
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 #
-# Buenos Aires (BA), Distrito Federal (DF), Santa Cruz (SC),
-# Tierra del Fuego (TF) & Antartida e Islas
+# Buenos Aires (BA), Capital Federal (CF), Santa Cruz (SC),
+# Tierra del Fuego, Antartida e Islas del Atlantico Sur (TF)
 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
-			-3:00	Arg	AR%sT
+			-3:00	Arg	AR%sT	1999 Oct  3 0:00
+			-4:00	Arg	AR%sT	2000 Mar  3 0:00
+			-3:00	-	ART
 #
 # Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
 # Formosa (FM), La Pampa (LP), Chubut (CH)
@@ -137,6 +144,8 @@ Zone America/Rosario	-4:02:40 -	LMT	1894
 			-4:00	-	ART	1930 Dec
 			-4:00	Arg	AR%sT	1969 Oct  5
 			-3:00	Arg	AR%sT	1991 Jul
+			-3:00	-	ART	1999 Oct  3 0:00
+			-4:00	Arg	AR%sT	2000 Mar  3 0:00
 			-3:00	-	ART
 #
 # Cordoba (CB), Santiago del Estero (SE), Salta (SA), Tucuman (TM), La Rioja (LR), San Juan (SJ), San Luis (SL),
@@ -146,6 +155,8 @@ Zone America/Cordoba	-4:16:44 -	LMT	1894
 			-4:00	-	ART	1930 Dec
 			-4:00	Arg	AR%sT	1969 Oct  5
 			-3:00	Arg	AR%sT	1990 Jul
+			-3:00	-	ART	1999 Oct  3 0:00
+			-4:00	Arg	AR%sT	2000 Mar  3 0:00
 			-3:00	-	ART
 #
 # Jujuy (JY)
@@ -157,6 +168,8 @@ Zone America/Jujuy	-4:21:12 -	LMT	1894 N
 			-4:00	-	WART	1991 Oct  6
 			-4:00	1:00	WARST	1992 Mar 15
 			-4:00	-	WART	1992 Oct 18
+			-3:00	-	ART	1999 Oct  3 0:00
+			-4:00	Arg	AR%sT	2000 Mar  3 0:00
 			-3:00	-	ART
 #
 # Catamarca (CT)
@@ -167,6 +180,8 @@ Zone America/Catamarca	-4:23:08 -	LMT	18
 			-3:00	Arg	AR%sT	1990 Jul
 			-3:00	-	ART	1991 Jul
 			-3:00	Arg	AR%sT	1992 Jul
+			-3:00	-	ART	1999 Oct  3 0:00
+			-4:00	Arg	AR%sT	2000 Mar  3 0:00
 			-3:00	-	ART
 #
 # Mendoza (MZ)
@@ -178,6 +193,8 @@ Zone America/Mendoza	-4:35:16 -	LMT	1894
 			-4:00	-	WART	1991 Oct 15
 			-4:00	1:00	WARST	1992 Mar  1
 			-4:00	-	WART	1992 Oct 18
+			-3:00	-	ART	1999 Oct  3 0:00
+			-4:00	Arg	AR%sT	2000 Mar  3 0:00
 			-3:00	-	ART
 
 # Aruba