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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
This file is part of systemd.
Copyright 2012 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
-->
<refentry id="timedatectl" conditional='ENABLE_TIMEDATED'
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>timedatectl</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Lennart</firstname>
<surname>Poettering</surname>
<email>lennart@poettering.net</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>timedatectl</refentrytitle>
<manvolnum>1</manvolnum>
</refmeta>
<refnamediv>
<refname>timedatectl</refname>
<refpurpose>Control the system time and date</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>timedatectl <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="req">COMMAND</arg></command>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><command>timedatectl</command> may be used to query and
change the system clock and its settings.</para>
<para>Use
<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
to initialize the system time zone for mounted (but not booted)
system images.</para>
</refsect1>
<refsect1>
<title>Options</title>
<para>The following options are understood:</para>
<variablelist>
<varlistentry>
<term><option>--no-ask-password</option></term>
<listitem><para>Do not query the user for authentication for
privileged operations.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--adjust-system-clock</option></term>
<listitem><para>If <command>set-local-rtc</command> is invoked
and this option is passed, the system clock is synchronized
from the RTC again, taking the new setting into account.
Otherwise, the RTC is synchronized from the system
clock.</para></listitem>
</varlistentry>
<xi:include href="user-system-options.xml" xpointer="host" />
<xi:include href="user-system-options.xml" xpointer="machine" />
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
<xi:include href="standard-options.xml" xpointer="no-pager" />
</variablelist>
<para>The following commands are understood:</para>
<variablelist>
<varlistentry>
<term><command>status</command></term>
<listitem><para>Show current settings
of the system clock and
RTC.</para></listitem>
</varlistentry>
<varlistentry>
<term><command>set-time [TIME]</command></term>
<listitem><para>Set the system clock to the specified time.
This will also update the RTC time accordingly. The time may
be specified in the format "2012-10-30
18:17:16".</para></listitem>
</varlistentry>
<varlistentry>
<term><command>set-timezone [TIMEZONE]</command></term>
<listitem><para>Set the system time zone to the specified
value. Available timezones can be listed with
<command>list-timezones</command>. If the RTC is configured to
be in the local time, this will also update the RTC time. This
call will alter the <filename>/etc/localtime</filename>
symlink. See
<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for more information.</para></listitem>
</varlistentry>
<varlistentry>
<term><command>list-timezones</command></term>
<listitem><para>List available time zones, one per line.
Entries from the list can be set as the system timezone with
<command>set-timezone</command>.</para></listitem>
</varlistentry>
<varlistentry>
<term><command>set-local-rtc [BOOL]</command></term>
<listitem><para>Takes a boolean argument. If
<literal>0</literal>, the system is configured to maintain the
RTC in universal time. If <literal>1</literal>, it will
maintain the RTC in local time instead. Note that maintaining
the RTC in the local timezone is not fully supported and will
create various problems with time zone changes and daylight
saving adjustments. If at all possible, keep the RTC in UTC
mode. Note that invoking this will also synchronize the RTC
from the system clock, unless
<option>--adjust-system-clock</option> is passed (see above).
This command will change the 3rd line of
<filename>/etc/adjtime</filename>, as documented in
<citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
</para></listitem>
</varlistentry>
<varlistentry>
<term><command>set-ntp [BOOL]</command></term>
<listitem><para>Takes a boolean argument. Controls whether NTP
based network time synchronization is enabled (if
available).</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Exit status</title>
<para>On success, 0 is returned, a non-zero failure
code otherwise.</para>
</refsect1>
<xi:include href="less-variables.xml" />
<refsect1>
<title>Examples</title>
<para>Show current settings:
<programlisting>$ timedatectl
Local time: Fri, 2012-11-02 09:26:46 CET
Universal time: Fri, 2012-11-02 08:26:46 UTC
RTC time: Fri, 2012-11-02 08:26:45
Timezone: Europe/Warsaw
UTC offset: +0100
NTP enabled: no
NTP synchronized: no
RTC in local TZ: no
DST active: no
Last DST change: CEST → CET, DST became inactive
Sun, 2012-10-28 02:59:59 CEST
Sun, 2012-10-28 02:00:00 CET
Next DST change: CET → CEST, DST will become active
the clock will jump one hour forward
Sun, 2013-03-31 01:59:59 CET
Sun, 2013-03-31 03:00:00 CEST</programlisting>
</para>
<para>Enable an NTP daemon (chronyd):
<programlisting>$ timedatectl set-ntp true
==== AUTHENTICATING FOR org.freedesktop.timedate1.set-ntp ===
Authentication is required to control whether network time synchronization shall be enabled.
Authenticating as: user
Password: ********
==== AUTHENTICATION COMPLETE ===</programlisting>
<programlisting>$ systemctl status chronyd.service
chronyd.service - NTP client/server
Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled)
Active: active (running) since Fri, 2012-11-02 09:36:25 CET; 5s ago
...</programlisting>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>date</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-timedated.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
|
