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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="timedatectl" conditional='ENABLE_TIMEDATECTL'
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>timedatectl</title>
+ <productname>systemd</productname>
+ </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</command>
+ <arg choice="opt" rep="repeat">OPTIONS</arg>
+ <arg choice="req">COMMAND</arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><command>timedatectl</command> may be used to query and change the system clock and its settings,
+ and enable or disable time synchronization services.</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>
+
+ <para><command>timedatectl</command> may be used to show the current status of time synchronization
+ services, for example
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+ </para>
+
+ </refsect1>
+
+ <refsect1>
+ <title>Commands</title>
+
+ <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, including whether network time
+ synchronization is active. If no command is specified, this is the implied default.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>show</command></term>
+
+ <listitem><para>Show the same information as <option>status</option>, but in machine readable form.
+ This command is intended to be used whenever computer-parsable output is required.
+ Use <option>status</option> if you are looking for formatted human-readable output.</para>
+ <para>By default, empty properties are suppressed. Use <option>--all</option> to show those too.
+ To select specific properties to show, use <option>--property=</option>.</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 network time synchronization is active and
+ enabled (if available). If the argument is true, this enables and starts the first existing network
+ synchronization service. If the argument is false, then this disables and stops the known network
+ synchronization services. The way that the list of services is built is described in
+ <citerefentry><refentrytitle>systemd-timedated.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+ </para></listitem>
+ </varlistentry>
+
+ </variablelist>
+
+ <refsect2>
+ <title>systemd-timesyncd Commands</title>
+
+ <para>The following commands are specific to
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+ </para>
+
+ <variablelist>
+ <varlistentry>
+ <term><command>timesync-status</command></term>
+
+ <listitem><para>Show current status of
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+ If <option>--monitor</option> is specified, then this will monitor the status updates.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>show-timesync</command></term>
+
+ <listitem><para>Show the same information as <option>timesync-status</option>, but in machine readable form.
+ This command is intended to be used whenever computer-parsable output is required.
+ Use <option>timesync-status</option> if you are looking for formatted human-readable output.</para>
+ <para>By default, empty properties are suppressed. Use <option>--all</option> to show those too.
+ To select specific properties to show, use <option>--property=</option>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>ntp-servers <replaceable>INTERFACE</replaceable> <replaceable>SERVER</replaceable>…</command></term>
+
+ <listitem><para>Set the interface specific NTP servers. This command can be used only when the
+ interface is managed by <command>systemd-networkd</command>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><command>revert <replaceable>INTERFACE</replaceable></command></term>
+
+ <listitem><para>Revert the interface specific NTP servers. This command can be used only when
+ the interface is managed by <command>systemd-networkd</command>.</para></listitem>
+ </varlistentry>
+ </variablelist>
+
+ </refsect2>
+
+ </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>
+
+ <varlistentry>
+ <term><option>--monitor</option></term>
+
+ <listitem><para>If <command>timesync-status</command> is invoked and this option is passed, then
+ <command>timedatectl</command> monitors the status of
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ and updates the outputs. Use <keycombo><keycap>Ctrl</keycap><keycap>C</keycap></keycombo> to terminate the
+ monitoring.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-a</option></term>
+ <term><option>--all</option></term>
+
+ <listitem><para>When showing properties of
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ show all properties regardless of whether they are set or not.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-p</option></term>
+ <term><option>--property=</option></term>
+
+ <listitem><para>When showing properties of
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ limit display to certain properties as specified as argument. If not specified, all set properties are shown.
+ The argument should be a property name, such as <literal>ServerName</literal>. If specified more than once,
+ all properties with the specified names are shown.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--value</option></term>
+
+ <listitem>
+ <para>When printing properties with <command>show-timesync</command>, only print the value, and skip the
+ property name and <literal>=</literal>.</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>
+ </refsect1>
+
+ <refsect1>
+ <title>Exit status</title>
+
+ <para>On success, 0 is returned, a non-zero failure code otherwise.</para>
+ </refsect1>
+
+ <xi:include href="common-variables.xml" />
+
+ <refsect1>
+ <title>Examples</title>
+ <para>Show current settings:
+ <programlisting>$ timedatectl
+ Local time: Thu 2017-09-21 16:08:56 CEST
+ Universal time: Thu 2017-09-21 14:08:56 UTC
+ RTC time: Thu 2017-09-21 14:08:56
+ Time zone: Europe/Warsaw (CEST, +0200)
+System clock synchronized: yes
+ NTP service: active
+ RTC in local TZ: no</programlisting>
+ </para>
+
+ <para>Enable network time synchronization:
+ <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 systemd-timesyncd.service
+● systemd-timesyncd.service - Network Time Synchronization
+ Loaded: loaded (/usr/lib/systemd/system/systemd-timesyncd.service; enabled)
+ Active: active (running) since Mo 2015-03-30 14:20:38 CEST; 5s ago
+ Docs: man:systemd-timesyncd.service(8)
+ Main PID: 595 (systemd-timesyn)
+ Status: "Using Time Server 216.239.38.15:123 (time4.google.com)."
+ CGroup: /system.slice/systemd-timesyncd.service
+ └─595 /usr/lib/systemd/systemd-timesyncd
+…</programlisting>
+ </para>
+
+ <para>Show current status of
+ <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>:
+ <programlisting>$ timedatectl timesync-status
+ Server: 216.239.38.15 (time4.google.com)
+Poll interval: 1min 4s (min: 32s; max 34min 8s)
+ Leap: normal
+ Version: 4
+ Stratum: 1
+ Reference: GPS
+ Precision: 1us (-20)
+Root distance: 335us (max: 5s)
+ Offset: +316us
+ Delay: 349us
+ Jitter: 0
+ Packet count: 1
+ Frequency: -8.802ppm</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-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>