3 # Old rules, should the need arise.
4 # No attempt is made to handle Newfoundland, since it cannot be expressed
5 # using the System V "TZ" scheme (half-hour offset), or anything outside
6 # North America (no support for non-standard DST start/end dates), nor
7 # the change in the DST rules in the US in 1987 (can't split between
8 # Canada, with no changes, and the US)
10 # Be sure to compile this *without* leap second correction for true conformance.
12 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
13 Rule SystemV min 1973 - Apr lastSun 2:00 1:00 D
14 Rule SystemV min 1973 - Oct lastSun 2:00 0 S
15 Rule SystemV 1974 only - Jan 6 2:00 1:00 D
16 Rule SystemV 1974 only - Nov lastSun 2:00 0 S
17 Rule SystemV 1975 only - Feb 23 2:00 1:00 D
18 Rule SystemV 1975 only - Oct lastSun 2:00 0 S
19 Rule SystemV 1976 max - Apr lastSun 2:00 1:00 D
20 Rule SystemV 1976 max - Oct lastSun 2:00 0 S
22 # Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
23 Zone SystemV/AST4ADT -4:00 SystemV A%sT
24 Zone SystemV/EST5EDT -5:00 SystemV E%sT
25 Zone SystemV/CST6CDT -6:00 SystemV C%sT
26 Zone SystemV/MST7MDT -7:00 SystemV M%sT
27 Zone SystemV/PST8PDT -8:00 SystemV P%sT
28 Zone SystemV/YST9YDT -9:00 SystemV Y%sT
29 Zone SystemV/AST4 -4:00 - AST
30 Zone SystemV/EST5 -5:00 - EST
31 Zone SystemV/CST6 -6:00 - CST
32 Zone SystemV/MST7 -7:00 - MST
33 Zone SystemV/PST8 -8:00 - PST
34 Zone SystemV/YST9 -9:00 - YST
35 Zone SystemV/HST10 -10:00 - HST