man/systemd-timedated.service.xml

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   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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   5 <!--
   6   SPDX-License-Identifier: LGPL-2.1+
   7
   8   Copyright 2010 Lennart Poettering
   9 -->
  10
  11 <refentry id="systemd-timedated.service" conditional='ENABLE_TIMEDATED'>
  12
  13   <refentryinfo>
  14     <title>systemd-timedated.service</title>
  15     <productname>systemd</productname>
  16
  17     <authorgroup>
  18       <author>
  19         <contrib>Developer</contrib>
  20         <firstname>Lennart</firstname>
  21         <surname>Poettering</surname>
  22         <email>lennart@poettering.net</email>
  23       </author>
  24     </authorgroup>
  25   </refentryinfo>
  26
  27   <refmeta>
  28     <refentrytitle>systemd-timedated.service</refentrytitle>
  29     <manvolnum>8</manvolnum>
  30   </refmeta>
  31
  32   <refnamediv>
  33     <refname>systemd-timedated.service</refname>
  34     <refname>systemd-timedated</refname>
  35     <refpurpose>Time and date bus mechanism</refpurpose>
  36   </refnamediv>
  37
  38   <refsynopsisdiv>
  39     <para><filename>systemd-timedated.service</filename></para>
  40     <para><filename>/usr/lib/systemd/systemd-timedated</filename></para>
  41   </refsynopsisdiv>
  42
  43   <refsect1>
  44     <title>Description</title>
  45
  46     <para><filename>systemd-timedated</filename> is a system service
  47     that may be used as a mechanism to change the system clock and
  48     timezone, as well as to enable/disable NTP time synchronization.
  49     <filename>systemd-timedated</filename> is automatically activated
  50     on request and terminates itself when it is unused.</para>
  51
  52     <para>The tool
  53     <citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
  54     is a command line client to this service.</para>
  55
  56     <para>See the <ulink
  57     url="https://www.freedesktop.org/wiki/Software/systemd/timedated">
  58     developer documentation</ulink> for information about the APIs
  59     <filename>systemd-timedated</filename> provides.</para>
  60   </refsect1>
  61
  62   <refsect1>
  63     <title>Environment</title>
  64
  65     <variablelist class='environment-variables'>
  66       <varlistentry>
  67         <term><varname>$SYSTEMD_TIMEDATED_NTP_SERVICES</varname></term>
  68
  69         <listitem><para>Colon-separated list of unit names of NTP client services.
  70         If not set, then
  71         <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  72         is used. See the entries of NTP related commands of
  73         <citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
  74         for details about this.</para>
  75
  76         <para>Example:
  77         <programlisting>SYSTEMD_TIMEDATED_NTP_SERVICES=ntpd.service:chronyd.service:systemd-timesyncd.service</programlisting>
  78         </para></listitem>
  79       </varlistentry>
  80     </variablelist>
  81   </refsect1>
  82   <refsect1>
  83     <title>See Also</title>
  84     <para>
  85       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  86       <citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  87       <citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  88       <citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
  89       <citerefentry><refentrytitle>systemd-timesyncd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  90     </para>
  91   </refsect1>
  92
  93 </refentry>