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amiga-tz/southamerica
Arthur David Olson 8f11a9f210 updated but with Naval Observatory data missing
SCCS-file: southamerica
SCCS-SID: 1.3
2012-07-18 03:01:46 -04:00

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# %W%
# 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.
###############################################################################
# Brazil
# The OAG lists October 25, 1987 and February 12, 1988 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.
# "Brazil/Acre" is for the Territory of Acre; "Brazil/DeNoronha" is for
# Fernando De Noronha.
# From Bob Devine (January 28, 1988): "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 (February 10, 1988):
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Brazil 1987 max - Feb Sat<=14 2:00 0 S
Rule Brazil 1987 max - Oct Sat<=28 2:00 1:00 D
# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
Zone Brazil/East -3:00 Brazil E%sT
Zone Brazil/West -4:00 Brazil W%sT
Zone Brazil/Acre -5:00 Brazil A%sT
Zone Brazil/DeNoronha -2:00 Brazil F%sT
###############################################################################
# Chile
# The OAG lists October 11, 1987 and March 12, 1988 as the starting and
# ending dates, giving them as "estimated date(s) based on previous year."
# From Bob Devine (January 28, 1988): "Chile has had 2nd Sunday in October to
# 2nd Sunday in March DST since 1977. Switch is at midnight. OAG is right."
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Chile 1977 max - Oct Sun>=8 0:00 1:00 D
Rule Chile 1978 max - Mar Sun>=8 0:00 0 S
# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
Zone Chile/Continental -4:00 Chile C%sT
Zone Chile/EasterIsland -6:00 Chile E%sT
###############################################################################
# Paraguay
# From Bob Devine (January 28, 1988): "Paraguay: First day in October to last
# in March. Midnight switch?? Since 1980."
# From U.S. Naval Observatory (February 10, 1988):
###############################################################################
# Argentina
# From Bob Devine (January 28, 1988): "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 (February 10, 1988):
# ARGENTINA 3 H BEHIND UTC
# (No mention of DST).