# <pre>
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
# Old rules, should the need arise.
# No attempt is made to handle Newfoundland, since it cannot be expressed
# using the System V "TZ" scheme (half-hour offset), or anything outside
# North America (no support for non-standard DST start/end dates), nor
# the changes in the DST rules in the US after 1976 (which occurred after
# the old rules were written).
#
# If you need the old rules, uncomment ## lines.
# Compile this *without* leap second correction for true conformance.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule SystemV min 1973 - Apr lastSun 2:00 1:00 D
Rule SystemV min 1973 - Oct lastSun 2:00 0 S
Rule SystemV 1974 only - Jan 6 2:00 1:00 D
Rule SystemV 1974 only - Nov lastSun 2:00 0 S
Rule SystemV 1975 only - Feb 23 2:00 1:00 D
Rule SystemV 1975 only - Oct lastSun 2:00 0 S
Rule SystemV 1976 max - Apr lastSun 2:00 1:00 D
Rule SystemV 1976 max - Oct lastSun 2:00 0 S
# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
## Zone SystemV/AST4ADT -4:00 SystemV A%sT
## Zone SystemV/EST5EDT -5:00 SystemV E%sT
## Zone SystemV/CST6CDT -6:00 SystemV C%sT
## Zone SystemV/MST7MDT -7:00 SystemV M%sT
## Zone SystemV/PST8PDT -8:00 SystemV P%sT
## Zone SystemV/YST9YDT -9:00 SystemV Y%sT
## Zone SystemV/AST4 -4:00 - AST
## Zone SystemV/EST5 -5:00 - EST
## Zone SystemV/CST6 -6:00 - CST
## Zone SystemV/MST7 -7:00 - MST
## Zone SystemV/PST8 -8:00 - PST
## Zone SystemV/YST9 -9:00 - YST
## Zone SystemV/HST10 -10:00 - HST
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