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-rw-r--r--timezone/southamerica21
1 files changed, 15 insertions, 6 deletions
diff --git a/timezone/southamerica b/timezone/southamerica
index f2bf217..eb25de9 100644
--- a/timezone/southamerica
+++ b/timezone/southamerica
@@ -1,4 +1,4 @@
-# @(#)southamerica 7.23
+# @(#)southamerica 7.24
# 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
@@ -6,8 +6,8 @@
# From Paul Eggert <eggert@twinsun.com> (1996-11-22):
# 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).
+# Thomas G. Shanks, The International Atlas (4th edition),
+# San Diego: ACS Publications, Inc. (1995).
#
# Gwillim Law <LAW@encmail.encompass.com> writes that a good source
# for recent time zone data is the International Air Transport
@@ -310,6 +310,8 @@ Zone America/Fortaleza -2:34:00 - LMT 1914
-3:00 - EST
#
# Alagoas, Sergipe, Tocantins
+# IATA SSIM (1996/1998) keeps bouncing back and forth as to whether
+# Alagoas and Sergipe observe DST. For now, continue to assume that they do.
Zone America/Maceio -2:22:52 - LMT 1914
-3:00 - EST 1963 Dec 9
-3:00 Brazil E%sT 1990 Jul
@@ -375,6 +377,7 @@ Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
# Colombia
# 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
@@ -384,6 +387,10 @@ 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
+# 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.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
-4:30 - ANT 1965 # Netherlands Antilles Time
@@ -458,9 +465,11 @@ 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 max - Mar 1 0:00 0 -
-Rule Para 1996 only - Oct 6 0:00 1:00 S
-Rule Para 1997 max - Oct 1 0:00 1:00 S
+Rule Para 1996 1998 - Mar 1 0:00 0 -
+Rule Para 1996 max - Oct Sun>=1 0:00 1:00 S
+# IATA SSIM (1998-02) claims that the 1999 switch will be on 02-27.
+# Assume this is a typo, and that 02-28 was meant.
+Rule Para 1999 max - Feb lastSun 0:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Asuncion -3:50:40 - LMT 1890
-3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time