Provided by: systemd-services_204-5ubuntu20_amd64 bug


       timedatectl - Control the system time and date


       timedatectl [OPTIONS...] {COMMAND}


       timedatectl may be used to query and change the system clock and its settings.


       The following options are understood:

       -h, --help
           Prints a short help text and exits.

           Prints a short version string and exits.

           Do not pipe output into a pager.

           Don't query the user for authentication for privileged operations.

       -H, --host
           Execute the operation remotely. Specify a hostname, or username and hostname separated
           by @, to connect to. This will use SSH to talk to a remote system.

           If set-local-rtc 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.

       The following commands are understood:

           Show current settings of the system clock and RTC.

       set-time [TIME]
           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".

       set-timezone [TIMEZONE]
           Set the system time zone to the specified value. Available time zones can be listed
           with list-timezones. If the RTC is configured to be in the local time this will also
           update the RTC time. This call will alter the /etc/localtime symlink. See localtime(5)
           for more information.

           List available time zones, one per line. Entries from the list can be set as the
           system time zone with set-timezone.

       set-local-rtc [BOOL]
           Takes a boolean argument. If 0 the system is configured to maintain the RTC in
           universal time, if 1 it will maintain the RTC in local time instead. Note that
           maintaining the RTC in the local time zone is not fully supported and will create
           various problems with time zone changes and daylight saving adjustments. If at all
           possible use RTC in UTC. Note that invoking this will also synchronize the RTC from
           the system clock, unless --adjust-system-clock is passed (see above). This command
           will change the 3rd line of /etc/adjtime, as documented in hwclock(8).

       set-ntp [BOOL]
           Takes a boolean argument. Controls whether NTP based network time synchronization is
           enabled (if available).


       On success 0 is returned, a non-zero failure code otherwise.


           Pager to use when --no-pager is not given; overrides $PAGER. Setting this to an empty
           string or the value cat is equivalent to passing --no-pager.


       Show current settings:

           $ 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

       Enable an NTP daemon (chronyd):

           $ 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: ********

           $ 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


       systemd(1), hwclock(8), date(1), localtime(5), systemctl(1), systemd-timedated.service(8)