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# <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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