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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