# <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