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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"

"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

<refentry id="timedatectl" conditional='ENABLE_TIMEDATED'

xmlns:xi="http://www.w3.org/2001/XInclude">

<refentryinfo>

<title>timedatectl</title>

<productname>systemd</productname>

<authorgroup>

<author>

<contrib>Developer</contrib>

<firstname>Lennart</firstname>

<surname>Poettering</surname>

<email>lennart@poettering.net</email>

</author>

</authorgroup>

</refentryinfo>

<refmeta>

<refentrytitle>timedatectl</refentrytitle>

<manvolnum>1</manvolnum>

</refmeta>

<refnamediv>

<refname>timedatectl</refname>

<refpurpose>Control the system time and date</refpurpose>

</refnamediv>

<refsynopsisdiv>

<cmdsynopsis>

<command>timedatectl <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="req">COMMAND</arg></command>

</cmdsynopsis>

</refsynopsisdiv>

<refsect1>

<title>Description</title>

<para><command>timedatectl</command> may be used to query and

change the system clock and its settings.</para>

<para>Use

<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>

to initialize the system time zone for mounted (but not booted)

system images.</para>

</refsect1>

<refsect1>

<title>Options</title>

<para>The following options are understood:</para>

<variablelist>

<varlistentry>

<term><option>--no-ask-password</option></term>

<listitem><para>Do not query the user for authentication for

privileged operations.</para></listitem>

</varlistentry>

<varlistentry>

<term><option>--adjust-system-clock</option></term>

<listitem><para>If <command>set-local-rtc</command> is invoked

and this option is passed, the system clock is synchronized

from the RTC again, taking the new setting into account.

Otherwise, the RTC is synchronized from the system

clock.</para></listitem>

</varlistentry>

<xi:include href="user-system-options.xml" xpointer="host" />

<xi:include href="user-system-options.xml" xpointer="machine" />

<xi:include href="standard-options.xml" xpointer="help" />

<xi:include href="standard-options.xml" xpointer="version" />

<xi:include href="standard-options.xml" xpointer="no-pager" />

</variablelist>

<para>The following commands are understood:</para>

<variablelist>

<varlistentry>

<term><command>status</command></term>

<listitem><para>Show current settings of the system clock and

RTC, including whether network time synchronization is

on. Note that whether network time synchronization is on

simply reflects whether the

<filename>systemd-timesyncd.service</filename> unit is

enabled. Even if this command shows the status as off, a

different service might still synchronize the clock with the

network.</para></listitem>

</varlistentry>

<varlistentry>

<term><command>set-time [TIME]</command></term>

<listitem><para>Set the system clock to the specified time.

This will also update the RTC time accordingly. The time may

be specified in the format "2012-10-30

18:17:16".</para></listitem>

</varlistentry>

<varlistentry>

<term><command>set-timezone [TIMEZONE]</command></term>

<listitem><para>Set the system time zone to the specified

value. Available timezones can be listed with

<command>list-timezones</command>. If the RTC is configured to

be in the local time, this will also update the RTC time. This

call will alter the <filename>/etc/localtime</filename>

symlink. See

<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>

for more information.</para></listitem>

</varlistentry>

<varlistentry>

<term><command>list-timezones</command></term>

<listitem><para>List available time zones, one per line.

Entries from the list can be set as the system timezone with

<command>set-timezone</command>.</para></listitem>

</varlistentry>

<varlistentry>

<term><command>set-local-rtc [BOOL]</command></term>

<listitem><para>Takes a boolean argument. If

<literal>0</literal>, the system is configured to maintain the

RTC in universal time. If <literal>1</literal>, it will

maintain the RTC in local time instead. Note that maintaining

the RTC in the local timezone is not fully supported and will

create various problems with time zone changes and daylight

saving adjustments. If at all possible, keep the RTC in UTC

mode. Note that invoking this will also synchronize the RTC

from the system clock, unless

<option>--adjust-system-clock</option> is passed (see above).

This command will change the 3rd line of

<filename>/etc/adjtime</filename>, as documented in

<citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>.

</para></listitem>

</varlistentry>

<varlistentry>

<term><command>set-ntp [BOOL]</command></term>

<listitem><para>Takes a boolean argument. Controls whether

network time synchronization is active and enabled (if

available). This enables and starts, or disables and stops the

<filename>systemd-timesyncd.service</filename> unit. It does

not affect the state of any other, unrelated network time

synchronization services that might be installed on the

system. This command is hence mostly equivalent to:

<command>systemctl enable --now

systemd-timesyncd.service</command> and <command>systemctl

disable --now systemd-timesyncd.service</command>, but is

protected by a different access policy.</para>

<para>Note that even if time synchronization is turned off

with this command, another unrelated system service might

still synchronize the clock with the network. Also note that,

strictly speaking,

<filename>systemd-timesyncd.service</filename> does more than

just network time synchronization, as it ensures a monotonic

clock on systems without RTC even if no network is

available. See

<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>

for details about this.</para></listitem>

</varlistentry>

</variablelist>

</refsect1>

<refsect1>

<title>Exit status</title>

<para>On success, 0 is returned, a non-zero failure

code otherwise.</para>

</refsect1>

<xi:include href="less-variables.xml" />

<refsect1>

<title>Examples</title>

<para>Show current settings:

<programlisting>$ timedatectl

Local time: Di 2015-04-07 16:26:56 CEST

Universal time: Di 2015-04-07 14:26:56 UTC

RTC time: Di 2015-04-07 14:26:56

Time zone: Europe/Berlin (CEST, +0200)

Network time on: yes

NTP synchronized: yes

RTC in local TZ: no</programlisting>

</para>

<para>Enable network time synchronization:

<programlisting>$ timedatectl set-ntp true

==== AUTHENTICATING FOR org.freedesktop.timedate1.set-ntp ===

Authentication is required to control whether network time synchronization shall be enabled.

Authenticating as: user

Password: ********

==== AUTHENTICATION COMPLETE ===</programlisting>

<programlisting>$ systemctl status systemd-timesyncd.service

● systemd-timesyncd.service - Network Time Synchronization

Loaded: loaded (/usr/lib/systemd/system/systemd-timesyncd.service; enabled)

Active: active (running) since Mo 2015-03-30 14:20:38 CEST; 5s ago

Docs: man:systemd-timesyncd.service(8)

Main PID: 595 (systemd-timesyn)

Status: "Using Time Server 216.239.38.15:123 (time4.google.com)."

CGroup: /system.slice/systemd-timesyncd.service

└─595 /usr/lib/systemd/systemd-timesyncd

...</programlisting>

</para>

</refsect1>

<refsect1>

<title>See Also</title>

<para>

<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,

<citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>,

<citerefentry project='man-pages'><refentrytitle>date</refentrytitle><manvolnum>1</manvolnum></citerefentry>,

<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>,

<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,

<citerefentry><refentrytitle>systemd-timedated.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,

<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,

<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>

</para>

</refsect1>

</refentry>