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−.. -*- coding: utf-8; -*-
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−.. include:: HEADER.rst
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−
+
−================
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− Date and time.
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−================
+
−.. contents::
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−
+
−System timer and system time.
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−=============================
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−
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−Windows.
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−--------
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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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−
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−UTC=no - system timer display locale time, UTC=yes - UTC time::
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−
+
−  $ cat /etc/default/rcS
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−  UTC=no
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−  # or UTC=yes
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−
+
−If system dual boot with Windows you must set ``UTC=no``.
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−
+
−Getting current date/time.
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−==========================
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−::
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−
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−  $ date +"%Y-%m-%d %H:%M:%S"
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−
+
−Setting current date/time.
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−==========================
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−::
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−
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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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−
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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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−
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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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−===============================
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−::
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−
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−  $ tzselect
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−
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−Set timezone.
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−=============
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−::
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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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−
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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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−
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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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−
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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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−
+
−Get timestamp.
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−--------------
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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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−::
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−
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−  $ date -d '1970-01-01 + 1234567890 seconds'
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−