man/systemd-timedated.service.xml

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<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</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>