man/systemd-timedated.service.xml

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