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−-*- mode: outline; coding: utf-8; fill-column: 80 -*-
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−
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−* System timer and system time.
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−
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−** Windows.
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−
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−Windows assume that system timer display locale time.
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−
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−** Debian.
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−
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−UTC=no - system timer display locale time, UTC=yes - UTC time.
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−
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−  $ cat /etc/default/rcS
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−  UTC=no
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−or
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−  UTC=yes
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−
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−If system dual boot with Windows you must set UTC=no.
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−
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−* Getting current date/time.
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−
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−  $ date +"%Y-%m-%d %H:%M:%S"
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−
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−* Setting current date/time.
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−
+
−  $ sudo date --set="2009-02-22 12:12:00" +"%Y-%m-%d %H:%M:%S"
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−
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−Or set utc time:
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−
+
−  $ sudo date --utc --set="2009-02-22 12:12:00" +"%Y-%m-%d %H:%M:%S"
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−
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−May be prefer use ntpdate(8) command.
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−
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−* Get timezone.
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−
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−System wide configuration:
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−
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−  $ cat /etc/timezone
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−
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−* Get list of supported timezone.
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−
+
−  $ tzselect
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−
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−* Set timezone.
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−
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−  $ sudo tzconfig
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−...
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−
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−Or using tzselect:
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−
+
−  $ sudo tzselect
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−...
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−
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−** Debian Lenny.
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−
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−  $ sudo dpkg-reconfigure tzdata
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−
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−* About timestamp.
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−
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−  http://en.wikipedia.org/wiki/Timestamp
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−  http://en.wikipedia.org/wiki/Unix_time
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−  http://en.wikipedia.org/wiki/Leap_second
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−
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−** Get timestamp.
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−
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−Current timestamp:
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−
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−  $ date +%s
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−
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−Timestamp for specific date/time:
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−
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−  $ date -d '2010-12-11' +%s
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−  $ date -d '2010-12-11 23:59:59' +%s
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−
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−** Convert unix timestamp to date.
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−
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−  $ date -d '1970-01-01 + 1234567890 seconds'
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−