diff options
Diffstat (limited to 'lib/libc/time/zic.8')
| -rw-r--r-- | lib/libc/time/zic.8 | 61 |
1 files changed, 59 insertions, 2 deletions
diff --git a/lib/libc/time/zic.8 b/lib/libc/time/zic.8 index a95b12c8878..c958991fade 100644 --- a/lib/libc/time/zic.8 +++ b/lib/libc/time/zic.8 @@ -1,4 +1,4 @@ -.\" $OpenBSD: zic.8,v 1.20 2007/02/07 15:24:58 jmc Exp $ +.\" $OpenBSD: zic.8,v 1.21 2007/02/27 16:40:35 millert Exp $ .Dd May 23, 1999 .Dt ZIC 8 .Os @@ -371,6 +371,63 @@ or (an abbreviation of) .Dq Rolling if the leap second time given by the other fields should be interpreted as local wall clock time. +.Sh EXTENDED EXAMPLE +Here is an extended example of +.Nm +input, intended to illustrate many of its features. +.br +.ne 22 +.nf +.in +2m +.ta \w'# Rule\0\0'u +\w'NAME\0\0'u +\w'FROM\0\0'u +\w'1973\0\0'u +\w'TYPE\0\0'u +\w'Apr\0\0'u +\w'lastSun\0\0'u +\w'2:00\0\0'u +\w'SAVE\0\0'u +.sp +# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S +Rule Swiss 1940 only - Nov 2 0:00 1:00 S +Rule Swiss 1940 only - Dec 31 0:00 0 - +Rule Swiss 1941 1942 - May Sun>=1 2:00 1:00 S +Rule Swiss 1941 1942 - Oct Sun>=1 0:00 0 +.sp .5 +Rule EU 1977 1980 - Apr Sun>=1 1:00u 1:00 S +Rule EU 1977 only - Sep lastSun 1:00u 0 - +Rule EU 1978 only - Oct 1 1:00u 0 - +Rule EU 1979 1995 - Sep lastSun 1:00u 0 - +Rule EU 1981 max - Mar lastSun 1:00u 1:00 S +Rule EU 1996 max - Oct lastSun 1:00u 0 - +.sp +.ta \w'# Zone\0\0'u +\w'Europe/Zurich\0\0'u +\w'0:34:08\0\0'u +\w'RULES/SAVE\0\0'u +\w'FORMAT\0\0'u +# Zone NAME GMTOFF RULES FORMAT UNTIL +Zone Europe/Zurich 0:34:08 - LMT 1848 Sep 12 + 0:29:44 - BMT 1894 Jun + 1:00 Swiss CE%sT 1981 + 1:00 EU CE%sT +.sp +Link Europe/Zurich Switzerland +.sp +.in +.fi +In this example, the zone is named Europe/Zurich but it has an alias +as Switzerland. Zurich was 34 minutes and 8 seconds west of GMT until +1848-09-12 at 00:00, when the offset changed to 29 minutes and 44 +seconds. After 1894-06-01 at 00:00 Swiss daylight saving rules (defined +with lines beginning with "Rule Swiss") apply, and the GMT offset +became one hour. From 1981 to the present, EU daylight saving rules have +applied, and the UTC offset has remained at one hour. +.Pp +In 1940, daylight saving time applied from November 2 at 00:00 to +December 31 at 00:00. In 1941 and 1942, daylight saving time applied +from the first Sunday in May at 02:00 to the first Sunday in October +at 00:00. +The pre-1981 EU daylight-saving rules have no effect +here, but are included for completeness. Since 1981, daylight +saving has begun on the last Sunday in March at 01:00 UTC. +Until 1995 it ended the last Sunday in September at 01:00 UTC, +but this changed to the last Sunday in October starting in 1996. +.Pp +For purposes of +display, "LMT" and "BMT" were initially used, respectively. Since +Swiss rules and later EU rules were applied, the display name for the +timezone has been CET for standard time and CEST for daylight saving +time. .Sh NOTES For areas with more than two types of local time, you may need to use local standard time in the @@ -400,6 +457,6 @@ standard directory used for created files .Xr ctime 3 , .Xr tzfile 5 , .Xr zdump 8 -.\" @(#)zic.8 8.2 +.\" @(#)zic.8 8.3 .\" This file is in the public domain, so clarified as of .\" 2003-02-14 by Arthur David Olson. |