diff options
Diffstat (limited to 'tz/zic.8')
| -rw-r--r-- | tz/zic.8 | 36 |
1 files changed, 36 insertions, 0 deletions
@@ -590,6 +590,42 @@ first transition into standard time. In a single zone it is an error if two rules take effect at the same instant, or if two zone changes take effect at the same instant. .PP +If a continuation line subtracts +.I N +seconds from the UT offset after a transition that would be +interpreted to be later if using the continuation line's UT offset and +rules, the +.q "until" +time of the previous zone or continuation line is interpreted +according to the continuation line's UT offset and rules, and any rule +that would otherwise take effect in the next +.I N +seconds is instead assumed to take effect simultaneously. +For example: +.br +.ne 7 +.nf +.in +2m +.ta \w'# Rule\0\0'u +\w'NAME\0\0'u +\w'FROM\0\0'u +\w'2006\0\0'u +\w'\*-\0\0'u +\w'Oct\0\0'u +\w'lastSun\0\0'u +\w'2:00\0\0'u +\w'SAVE\0\0'u +.sp +# Rule NAME FROM TO \*- IN ON AT SAVE LETTER/S +Rule US 1967 2006 - Oct lastSun 2:00 0 S +Rule US 1967 1973 - Apr lastSun 2:00 1:00 D +.ta \w'Zone\0\0America/Menominee\0\0'u +\w'STDOFF\0\0'u +\w'RULES\0\0'u +\w'FORMAT\0\0'u +# Zone\0\0NAME STDOFF RULES FORMAT [UNTIL] +Zone\0\0America/Menominee \*-5:00 \*- EST 1973 Apr 29 2:00 + \*-6:00 US C%sT +.sp +.in +.fi +Here, an incorrect reading would be there were two clock changes on 1973-04-29, +the first from 02:00 EST (\*-05) to 01:00 CST (\*-06), +and the second an hour later from 02:00 CST (\*-06) to 03:00 CDT (\*-05). +However, +.B zic +interprets this more sensibly as a single transition from 02:00 CST (\*-05) to +02:00 CDT (\*-05). +.PP A link line has the form .sp .nf |