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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">
<!--
SPDX-License-Identifier: LGPL-2.1+
Copyright 2010 Lennart Poettering
-->
<refentry id="systemd-timedated.service" conditional='ENABLE_TIMEDATED'>
<refentryinfo>
<title>systemd-timedated.service</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>systemd-timedated.service</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-timedated.service</refname>
<refname>systemd-timedated</refname>
<refpurpose>Time and date bus mechanism</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>systemd-timedated.service</filename></para>
<para><filename>/usr/lib/systemd/systemd-timedated</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><filename>systemd-timedated</filename> is a system service
that may be used as a mechanism to change the system clock and
timezone, as well as to enable/disable NTP time synchronization.
<filename>systemd-timedated</filename> is automatically activated
on request and terminates itself when it is unused.</para>
<para>The tool
<citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
is a command line client to this service.</para>
<para>See the <ulink
url="https://www.freedesktop.org/wiki/Software/systemd/timedated">
developer documentation</ulink> for information about the APIs
<filename>systemd-timedated</filename> provides.</para>
</refsect1>
<refsect1>
<title>Environment</title>
<variablelist class='environment-variables'>
<varlistentry>
<term><varname>$SYSTEMD_TIMEDATED_NTP_SERVICES</varname></term>
<listitem><para>Colon-separated list of unit names of NTP client services.
If not set, then
<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
is used. See the entries of NTP related commands of
<citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
for details about this.</para>
<para>Example:
<programlisting>SYSTEMD_TIMEDATED_NTP_SERVICES=ntpd.service:chronyd.service:systemd-timesyncd.service</programlisting>
</para></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-timesyncd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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