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