--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/date.rst	Fri Jul 13 22:32:19 2012 +0300
@@ -0,0 +1,100 @@
+.. -*- coding: utf-8; -*-
+.. include:: HEADER.rst
+
+================
+ Date and time.
+================
+.. contents::
+
+System timer and system time.
+=============================
+
+Windows.
+--------
+
+Windows assume that system timer display locale time.
+
+Debian.
+-------
+
+UTC=no - system timer display locale time, UTC=yes - UTC time::
+
+  $ cat /etc/default/rcS
+  UTC=no
+  # or UTC=yes
+
+If system dual boot with Windows you must set ``UTC=no``.
+
+Getting current date/time.
+==========================
+::
+
+  $ date +"%Y-%m-%d %H:%M:%S"
+
+Setting current date/time.
+==========================
+::
+
+  $ sudo date --set="2009-02-22 12:12:00" +"%Y-%m-%d %H:%M:%S"
+
+Or set utc time::
+
+  $ sudo date --utc --set="2009-02-22 12:12:00" +"%Y-%m-%d %H:%M:%S"
+
+May be prefer use ntpdate(8) command.
+
+Get timezone.
+=============
+
+System wide configuration::
+
+  $ cat /etc/timezone
+
+Get list of supported timezone.
+===============================
+::
+
+  $ tzselect
+
+Set timezone.
+=============
+::
+
+  $ sudo tzconfig
+  ...
+
+Or using tzselect::
+
+  $ sudo tzselect
+  ...
+
+Debian Lenny.
+-------------
+
+  $ sudo dpkg-reconfigure tzdata
+
+About timestamp.
+================
+
+ * http://en.wikipedia.org/wiki/Timestamp
+ * http://en.wikipedia.org/wiki/Unix_time
+ * http://en.wikipedia.org/wiki/Leap_second
+
+Get timestamp.
+--------------
+
+Current timestamp::
+
+  $ date +%s
+
+Timestamp for specific date/time::
+
+  $ date -d '2010-12-11' +%s
+  $ date -d '2010-12-11 23:59:59' +%s
+
+Convert unix timestamp to date.
+-------------------------------
+::
+
+  $ date -d '1970-01-01 + 1234567890 seconds'
+