<?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 2010 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="systemd-timedated.service">
-
- <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 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>See the <ulink
- url="http://www.freedesktop.org/wiki/Software/systemd/timedated">
- developer documentation</ulink> for information about
- the APIs <filename>systemd-timedated</filename>
- provides.</para>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>timezone</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- </para>
- </refsect1>
+<!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+ -->
+
+<refentry id="systemd-timedated.service" conditional='ENABLE_TIMEDATED'>
+
+ <refentryinfo>
+ <title>systemd-timedated.service</title>
+ <productname>systemd</productname>
+ </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.service</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 network 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><filename>systemd-timedated</filename> currently offers access to
+ the following four settings:
+ <itemizedlist>
+ <listitem><para>The system time</para></listitem>
+
+ <listitem><para>The system timezone</para></listitem>
+
+ <listitem><para>A boolean controlling whether the system RTC is in local or UTC
+ timezone</para></listitem>
+
+ <listitem><para>Whether the time synchronization service is enabled/started or
+ disabled/stopped, see next section.</para></listitem>
+ </itemizedlist></para>
+
+ <para>See
+ <citerefentry><refentrytitle>org.freedesktop.timedate1</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ and
+ <citerefentry><refentrytitle>org.freedesktop.LogControl1</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for information about the D-Bus API.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>List of network time synchronization services</title>
+
+ <para><command>systemd-timesyncd</command> will look for files with a <literal>.list</literal> extension
+ in <filename>ntp-units.d/</filename> directories. Each file is parsed as a list of unit names, one per
+ line. Empty lines and lines with comments (<literal>#</literal>) are ignored. Files are read from
+ <filename>/usr/lib/systemd/ntp-units.d/</filename> and the corresponding directories under
+ <filename>/etc/</filename>, <filename>/run/</filename>, <filename>/usr/local/lib/</filename>. Files in
+ <filename>/etc/</filename> override files with the same name in <filename>/run/</filename>,
+ <filename>/usr/local/lib/</filename>, and <filename>/usr/lib/</filename>. Files in
+ <filename>/run/</filename> override files with the same name under <filename>/usr/</filename>. Packages
+ should install their configuration files in <filename>/usr/lib/</filename> (distribution packages) or
+ <filename>/usr/local/lib/</filename> (local installs).</para>
+
+ <example>
+ <title><filename>ntp-units.d/</filename> entry for <command>systemd-timesyncd</command></title>
+ <programlisting># /usr/lib/systemd/ntp-units.d/80-systemd-timesync.list
+systemd-timesyncd.service
+</programlisting>
+ </example>
+
+ <para>If the environment variable <varname>$SYSTEMD_TIMEDATED_NTP_SERVICES</varname> is set,
+ <command>systemd-timesyncd</command> will parse the contents of that variable as a colon-separated list
+ of unit names. When set, this variable overrides the file-based list described above.</para>
+
+ <example>
+ <title>An override that specifies that <command>chronyd</command> should be used if available</title>
+ <programlisting>SYSTEMD_TIMEDATED_NTP_SERVICES=chronyd.service:systemd-timesyncd.service</programlisting>
+ </example>
+ </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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