1 <?xml version='
1.0'
?> <!--*-nxml-*-->
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+ -->
6 <refentry id=
"systemd-timedated.service" conditional='ENABLE_TIMEDATED'
>
9 <title>systemd-timedated.service
</title>
10 <productname>systemd
</productname>
14 <refentrytitle>systemd-timedated.service
</refentrytitle>
15 <manvolnum>8</manvolnum>
19 <refname>systemd-timedated.service
</refname>
20 <refname>systemd-timedated
</refname>
21 <refpurpose>Time and date bus mechanism
</refpurpose>
25 <para><filename>systemd-timedated.service
</filename></para>
26 <para><filename>/usr/lib/systemd/systemd-timedated
</filename></para>
30 <title>Description
</title>
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>
39 <citerefentry><refentrytitle>timedatectl
</refentrytitle><manvolnum>1</manvolnum></citerefentry>
40 is a command line client to this service.
</para>
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>
49 <title>Environment
</title>
51 <variablelist class='environment-variables'
>
53 <term><varname>$SYSTEMD_TIMEDATED_NTP_SERVICES
</varname></term>
55 <listitem><para>Colon-separated list of unit names of NTP client services.
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>
63 <programlisting>SYSTEMD_TIMEDATED_NTP_SERVICES=ntpd.service:chronyd.service:systemd-timesyncd.service
</programlisting>
69 <title>See Also
</title>
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>