diff -ur tzdata2009o/southamerica tzdata2009o_MODIF/southamerica
--- tzdata2009o/southamerica	2009-10-05 12:43:25.000000000 -0300
+++ tzdata2009o_MODIF/southamerica	2009-10-21 14:35:40.000000000 -0300
@@ -216,8 +216,8 @@
 # </a>
 
 Rule	Arg	2007	only	-	Dec	30	0:00	1:00	S
-Rule	Arg	2008	max	-	Mar	Sun>=15	0:00	0	-
-Rule	Arg	2008	max	-	Oct	Sun>=15	0:00	1:00	S
+Rule	Arg	2008	2009	-	Mar	Sun>=15	0:00	0	-
+Rule	Arg	2008	only	-	Oct	Sun>=15	0:00	1:00	S
  
 # From Mariano Absatz (2004-05-21):
 # Today it was officially published that the Province of Mendoza is changing
@@ -560,6 +560,9 @@
 			-3:00	-	ART
 #
 # San Luis (SL)
+Rule	SanLuis	2008	max	-	Mar	Sun>=8	0:00	0	-
+Rule	SanLuis	2007	max	-	Oct	Sun>=8	0:00	1:00	S
+
 Zone America/Argentina/San_Luis -4:25:24 - LMT	1894 Oct 31
 			-4:16:48 -	CMT	1920 May
 			-4:00	-	ART	1930 Dec
@@ -574,8 +577,7 @@
 			-3:00	-	ART	2004 May 31
 			-4:00	-	WART	2004 Jul 25
 			-3:00	Arg	AR%sT	2008 Jan 21
-			-3:00	-	ART	2009 Mar 15
-			-4:00	Arg	WAR%sT
+			-4:00	SanLuis	WAR%sT
 #
 # Santa Cruz (SC)
 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31