1 <?xml version='
1.0'
?> <!--*-nxml-*-->
2 <!DOCTYPE refentry PUBLIC
"-//OASIS//DTD DocBook XML V4.2//EN"
3 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
6 SPDX-License-Identifier: LGPL-2.1+
9 <refentry id=
"systemd-timedated.service" conditional='ENABLE_TIMEDATED'
>
12 <title>systemd-timedated.service
</title>
13 <productname>systemd
</productname>
17 <refentrytitle>systemd-timedated.service
</refentrytitle>
18 <manvolnum>8</manvolnum>
22 <refname>systemd-timedated.service
</refname>
23 <refname>systemd-timedated
</refname>
24 <refpurpose>Time and date bus mechanism
</refpurpose>
28 <para><filename>systemd-timedated.service
</filename></para>
29 <para><filename>/usr/lib/systemd/systemd-timedated
</filename></para>
33 <title>Description
</title>
35 <para><filename>systemd-timedated
</filename> is a system service
36 that may be used as a mechanism to change the system clock and
37 timezone, as well as to enable/disable NTP time synchronization.
38 <filename>systemd-timedated
</filename> is automatically activated
39 on request and terminates itself when it is unused.
</para>
42 <citerefentry><refentrytitle>timedatectl
</refentrytitle><manvolnum>1</manvolnum></citerefentry>
43 is a command line client to this service.
</para>
46 url=
"https://www.freedesktop.org/wiki/Software/systemd/timedated">
47 developer documentation
</ulink> for information about the APIs
48 <filename>systemd-timedated
</filename> provides.
</para>
52 <title>Environment
</title>
54 <variablelist class='environment-variables'
>
56 <term><varname>$SYSTEMD_TIMEDATED_NTP_SERVICES
</varname></term>
58 <listitem><para>Colon-separated list of unit names of NTP client services.
60 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>
61 is used. See the entries of NTP related commands of
62 <citerefentry><refentrytitle>timedatectl
</refentrytitle><manvolnum>1</manvolnum></citerefentry>
63 for details about this.
</para>
66 <programlisting>SYSTEMD_TIMEDATED_NTP_SERVICES=ntpd.service:chronyd.service:systemd-timesyncd.service
</programlisting>
72 <title>See Also
</title>
74 <citerefentry><refentrytitle>systemd
</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
75 <citerefentry><refentrytitle>timedatectl
</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
76 <citerefentry><refentrytitle>localtime
</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
77 <citerefentry project='man-pages'
><refentrytitle>hwclock
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
78 <citerefentry><refentrytitle>systemd-timesyncd
</refentrytitle><manvolnum>8</manvolnum></citerefentry>