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228 lines
8.5 KiB
XML
228 lines
8.5 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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-->
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<refentry id="timedatectl" conditional='ENABLE_TIMEDATED'
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>timedatectl</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>timedatectl</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>timedatectl</refname>
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<refpurpose>Control the system time and date</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>timedatectl <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="req">COMMAND</arg></command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>timedatectl</command> may be used to query and
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change the system clock and its settings.</para>
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<para>Use
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<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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to initialize the system time zone for mounted (but not booted)
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system images.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>--no-ask-password</option></term>
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<listitem><para>Do not query the user for authentication for
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privileged operations.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--adjust-system-clock</option></term>
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<listitem><para>If <command>set-local-rtc</command> is invoked
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and this option is passed, the system clock is synchronized
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from the RTC again, taking the new setting into account.
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Otherwise, the RTC is synchronized from the system
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clock.</para></listitem>
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</varlistentry>
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<xi:include href="user-system-options.xml" xpointer="host" />
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<xi:include href="user-system-options.xml" xpointer="machine" />
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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<xi:include href="standard-options.xml" xpointer="no-pager" />
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Commands</title>
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<para>The following commands are understood:</para>
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<variablelist>
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<varlistentry>
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<term><command>status</command></term>
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<listitem><para>Show current settings of the system clock and RTC,
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including whether network time synchronization through
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<filename>systemd-timesyncd.service</filename> is active. Even if it is
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inactive, a different service might still synchronize the clock.
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If no command is specified, this is the implied default.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>set-time [TIME]</command></term>
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<listitem><para>Set the system clock to the specified time.
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This will also update the RTC time accordingly. The time may
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be specified in the format "2012-10-30
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18:17:16".</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>set-timezone [TIMEZONE]</command></term>
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<listitem><para>Set the system time zone to the specified
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value. Available timezones can be listed with
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<command>list-timezones</command>. If the RTC is configured to
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be in the local time, this will also update the RTC time. This
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call will alter the <filename>/etc/localtime</filename>
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symlink. See
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<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for more information.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>list-timezones</command></term>
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<listitem><para>List available time zones, one per line.
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Entries from the list can be set as the system timezone with
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<command>set-timezone</command>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>set-local-rtc [BOOL]</command></term>
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<listitem><para>Takes a boolean argument. If
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<literal>0</literal>, the system is configured to maintain the
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RTC in universal time. If <literal>1</literal>, it will
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maintain the RTC in local time instead. Note that maintaining
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the RTC in the local timezone is not fully supported and will
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create various problems with time zone changes and daylight
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saving adjustments. If at all possible, keep the RTC in UTC
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mode. Note that invoking this will also synchronize the RTC
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from the system clock, unless
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<option>--adjust-system-clock</option> is passed (see above).
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This command will change the 3rd line of
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<filename>/etc/adjtime</filename>, as documented in
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<citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><command>set-ntp [BOOL]</command></term>
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<listitem><para>Takes a boolean argument. Controls whether network time synchronization is active
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and enabled (if available). If the argument is true, this enables and starts the first existed
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service listed in the environment variable <varname>$SYSTEMD_TIMEDATED_NTP_SERVICES</varname>
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of <filename>systemd-timedated.service</filename>. If the argument is false, then this disables and
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stops the all services listed in <varname>$SYSTEMD_TIMEDATED_NTP_SERVICES</varname>.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success, 0 is returned, a non-zero failure
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code otherwise.</para>
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</refsect1>
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<xi:include href="less-variables.xml" />
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<refsect1>
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<title>Examples</title>
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<para>Show current settings:
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<programlisting>$ timedatectl
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Local time: Thu 2017-09-21 16:08:56 CEST
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Universal time: Thu 2017-09-21 14:08:56 UTC
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RTC time: Thu 2017-09-21 14:08:56
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Time zone: Europe/Warsaw (CEST, +0200)
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System clock synchronized: yes
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NTP service: active
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RTC in local TZ: no</programlisting>
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</para>
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<para>Enable network time synchronization:
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<programlisting>$ timedatectl set-ntp true
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==== AUTHENTICATING FOR org.freedesktop.timedate1.set-ntp ===
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Authentication is required to control whether network time synchronization shall be enabled.
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Authenticating as: user
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Password: ********
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==== AUTHENTICATION COMPLETE ===</programlisting>
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<programlisting>$ systemctl status systemd-timesyncd.service
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● systemd-timesyncd.service - Network Time Synchronization
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Loaded: loaded (/usr/lib/systemd/system/systemd-timesyncd.service; enabled)
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Active: active (running) since Mo 2015-03-30 14:20:38 CEST; 5s ago
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Docs: man:systemd-timesyncd.service(8)
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Main PID: 595 (systemd-timesyn)
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Status: "Using Time Server 216.239.38.15:123 (time4.google.com)."
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CGroup: /system.slice/systemd-timesyncd.service
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└─595 /usr/lib/systemd/systemd-timesyncd
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…</programlisting>
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>date</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-timedated.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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