man/systemd-timedated.service.xml

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   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   3   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   4
   5 <!--
   6   SPDX-License-Identifier: LGPL-2.1+
   7
   8   This file is part of systemd.
   9
  10   Copyright 2010 Lennart Poettering
  11 -->
  12
  13 <refentry id="systemd-timedated.service" conditional='ENABLE_TIMEDATED'>
  14
  15   <refentryinfo>
  16     <title>systemd-timedated.service</title>
  17     <productname>systemd</productname>
  18
  19     <authorgroup>
  20       <author>
  21         <contrib>Developer</contrib>
  22         <firstname>Lennart</firstname>
  23         <surname>Poettering</surname>
  24         <email>lennart@poettering.net</email>
  25       </author>
  26     </authorgroup>
  27   </refentryinfo>
  28
  29   <refmeta>
  30     <refentrytitle>systemd-timedated.service</refentrytitle>
  31     <manvolnum>8</manvolnum>
  32   </refmeta>
  33
  34   <refnamediv>
  35     <refname>systemd-timedated.service</refname>
  36     <refname>systemd-timedated</refname>
  37     <refpurpose>Time and date bus mechanism</refpurpose>
  38   </refnamediv>
  39
  40   <refsynopsisdiv>
  41     <para><filename>systemd-timedated.service</filename></para>
  42     <para><filename>/usr/lib/systemd/systemd-timedated</filename></para>
  43   </refsynopsisdiv>
  44
  45   <refsect1>
  46     <title>Description</title>
  47
  48     <para><filename>systemd-timedated</filename> is a system service
  49     that may be used as a mechanism to change the system clock and
  50     timezone, as well as to enable/disable NTP time synchronization.
  51     <filename>systemd-timedated</filename> is automatically activated
  52     on request and terminates itself when it is unused.</para>
  53
  54     <para>The tool
  55     <citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
  56     is a command line client to this service.</para>
  57
  58     <para>See the <ulink
  59     url="https://www.freedesktop.org/wiki/Software/systemd/timedated">
  60     developer documentation</ulink> for information about the APIs
  61     <filename>systemd-timedated</filename> provides.</para>
  62   </refsect1>
  63
  64   <refsect1>
  65     <title>Environment</title>
  66
  67     <variablelist class='environment-variables'>
  68       <varlistentry>
  69         <term><varname>$SYSTEMD_TIMEDATED_NTP_SERVICES</varname></term>
  70
  71         <listitem><para>Colon-separated list of unit names of NTP client services.
  72         If not set, then
  73         <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  74         is used. See the entries of NTP related commands of
  75         <citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
  76         for details about this.</para>
  77
  78         <para>Example:
  79         <programlisting>SYSTEMD_TIMEDATED_NTP_SERVICES=ntpd.service:chronyd.service:systemd-timesyncd.service</programlisting>
  80         </para></listitem>
  81       </varlistentry>
  82     </variablelist>
  83   </refsect1>
  84   <refsect1>
  85     <title>See Also</title>
  86     <para>
  87       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  88       <citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  89       <citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  90       <citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
  91       <citerefentry><refentrytitle>systemd-timesyncd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  92     </para>
  93   </refsect1>
  94
  95 </refentry>