date.rst
author Oleksandr Gavenko <gavenkoa@gmail.com>
Mon, 16 Sep 2019 22:13:19 +0300
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permissions -rw-r--r--
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.. -*- coding: utf-8; -*-
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================
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 Date and time.
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================
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.. contents::
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   :local:
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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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Debian.
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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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  $ 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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  $ sudo date --set="2009-02-22 12:12:00" +"%Y-%m-%d %H:%M:%S"
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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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May be prefer use ntpdate(8) command.
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Get timezone.
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=============
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System wide configuration::
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  $ cat /etc/timezone
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Get list of supported timezone.
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===============================
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::
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  $ tzselect
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Set timezone.
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=============
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::
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  $ sudo tzconfig
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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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Debian Lenny.
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-------------
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::
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  $ sudo dpkg-reconfigure tzdata
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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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Get timestamp.
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Current timestamp::
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  $ date +%s
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Timestamp for specific date/time::
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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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Convert unix timestamp to date.
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-------------------------------
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::
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  $ date -d '1970-01-01 + 1234567890 seconds'
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