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11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
245 lines
9.3 KiB
XML
245 lines
9.3 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
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network time synchronization is active and enabled (if
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available). This enables and starts, or disables and stops the
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<filename>systemd-timesyncd.service</filename> unit. It does
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not affect the state of any other, unrelated network time
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synchronization services that might be installed on the
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system. This command is hence mostly equivalent to:
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<command>systemctl enable --now
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systemd-timesyncd.service</command> and <command>systemctl
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disable --now systemd-timesyncd.service</command>, but is
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protected by a different access policy.</para>
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<para>Note that even if time synchronization is turned off
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with this command, another unrelated system service might
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still synchronize the clock with the network. Also note that,
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strictly speaking,
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<filename>systemd-timesyncd.service</filename> does more than
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just network time synchronization, as it ensures a monotonic
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clock on systems without RTC even if no network is
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available. See
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<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for details about this.</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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systemd-timesyncd.service active: yes
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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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