| <?xml version='1.0'?> <!--*-nxml-*--> |
| <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" |
| "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
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| Copyright 2012 Lennart Poettering |
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| |
| <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.</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 NTP based |
| network time synchronization is |
| enabled (if |
| available).</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: Fri, 2012-11-02 09:26:46 CET |
| Universal time: Fri, 2012-11-02 08:26:46 UTC |
| RTC time: Fri, 2012-11-02 08:26:45 |
| Timezone: Europe/Warsaw |
| UTC offset: +0100 |
| NTP enabled: no |
| NTP synchronized: no |
| RTC in local TZ: no |
| DST active: no |
| Last DST change: CEST → CET, DST became inactive |
| Sun, 2012-10-28 02:59:59 CEST |
| Sun, 2012-10-28 02:00:00 CET |
| Next DST change: CET → CEST, DST will become active |
| the clock will jump one hour forward |
| Sun, 2013-03-31 01:59:59 CET |
| Sun, 2013-03-31 03:00:00 CEST</programlisting> |
| </para> |
| |
| <para>Enable an NTP daemon (chronyd): |
| <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 chronyd.service |
| chronyd.service - NTP client/server |
| Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled) |
| Active: active (running) since Fri, 2012-11-02 09:36:25 CET; 5s ago |
| ...</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-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry> |
| </para> |
| </refsect1> |
| |
| </refentry> |