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+
8 Copyright 2010 Lennart Poettering
11 <refentry id=
"systemd-timedated.service" conditional='ENABLE_TIMEDATED'
>
14 <title>systemd-timedated.service
</title>
15 <productname>systemd
</productname>
19 <contrib>Developer
</contrib>
20 <firstname>Lennart
</firstname>
21 <surname>Poettering
</surname>
22 <email>lennart@poettering.net
</email>
28 <refentrytitle>systemd-timedated.service
</refentrytitle>
29 <manvolnum>8</manvolnum>
33 <refname>systemd-timedated.service
</refname>
34 <refname>systemd-timedated
</refname>
35 <refpurpose>Time and date bus mechanism
</refpurpose>
39 <para><filename>systemd-timedated.service
</filename></para>
40 <para><filename>/usr/lib/systemd/systemd-timedated
</filename></para>
44 <title>Description
</title>
46 <para><filename>systemd-timedated
</filename> is a system service
47 that may be used as a mechanism to change the system clock and
48 timezone, as well as to enable/disable NTP time synchronization.
49 <filename>systemd-timedated
</filename> is automatically activated
50 on request and terminates itself when it is unused.
</para>
53 <citerefentry><refentrytitle>timedatectl
</refentrytitle><manvolnum>1</manvolnum></citerefentry>
54 is a command line client to this service.
</para>
57 url=
"https://www.freedesktop.org/wiki/Software/systemd/timedated">
58 developer documentation
</ulink> for information about the APIs
59 <filename>systemd-timedated
</filename> provides.
</para>
63 <title>Environment
</title>
65 <variablelist class='environment-variables'
>
67 <term><varname>$SYSTEMD_TIMEDATED_NTP_SERVICES
</varname></term>
69 <listitem><para>Colon-separated list of unit names of NTP client services.
71 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>
72 is used. See the entries of NTP related commands of
73 <citerefentry><refentrytitle>timedatectl
</refentrytitle><manvolnum>1</manvolnum></citerefentry>
74 for details about this.
</para>
77 <programlisting>SYSTEMD_TIMEDATED_NTP_SERVICES=ntpd.service:chronyd.service:systemd-timesyncd.service
</programlisting>
83 <title>See Also
</title>
85 <citerefentry><refentrytitle>systemd
</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
86 <citerefentry><refentrytitle>timedatectl
</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
87 <citerefentry><refentrytitle>localtime
</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
88 <citerefentry project='man-pages'
><refentrytitle>hwclock
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
89 <citerefentry><refentrytitle>systemd-timesyncd
</refentrytitle><manvolnum>8</manvolnum></citerefentry>