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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/clock.n | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/doc/clock.n b/doc/clock.n index 60042be..f4c3805 100644 --- a/doc/clock.n +++ b/doc/clock.n @@ -805,6 +805,23 @@ environment variable will be recognized. The specification may be found at \fIhttp://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html\fR. .PP +If the Posix time zone string contains a DST (Daylight Savings Time) +part, but doesn't contain a rule stating when DST starts or ends, +then default rules are used. For Timezones with an offset between 0 +and +12, the current European/Russian rules are used, otherwise the +current US rules are used. In Europe (offset +0 to +2) the switch +to summertime is done each last Sunday in March at 1:00 GMT, and +the switch back is each last Sunday in October at 2:00 GMT. In +Russia (offset +3 to +12), the switch dates are the same, only +the switch to summertime is at 2:00 local time, and the switch +back is at 3:00 local time in all time zones. The US switch to +summertime takes place each second Sunday in March at 2:00 local +time, and the switch back is each first Sunday in November at +3:00 local time. These default rules mean that in all European, +Russian and US (or compatible) time zones, DST calculations will +be correct for dates in 2007 and later, unless in the future the +rules change again. +.PP Any other time zone string is processed by prefixing a colon and attempting to use it as a location name, as above. .SH "LOCALIZATION" |