NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT STATUS | ENVIRONMENT | EXAMPLES | SEE ALSO | COLOPHON

TIMEDATECTL(1)                   timedatectl                  TIMEDATECTL(1)

NAME         top

       timedatectl - Control the system time and date

SYNOPSIS         top

       timedatectl [OPTIONS...] {COMMAND}

DESCRIPTION         top

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

       Use systemd-firstboot(1) to initialize the system time zone for
       mounted (but not booted) system images.

OPTIONS         top

       The following options are understood:

       --no-ask-password
           Do not query the user for authentication for privileged
           operations.

       --adjust-system-clock
           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.

       -H, --host=
           Execute the operation remotely. Specify a hostname, or a username
           and hostname separated by "@", to connect to. The hostname may
           optionally be suffixed by a container name, separated by ":",
           which connects directly to a specific container on the specified
           host. This will use SSH to talk to the remote machine manager
           instance. Container names may be enumerated with machinectl -H
           HOST.

       -M, --machine=
           Execute operation on a local container. Specify a container name
           to connect to.

       -h, --help
           Print a short help text and exit.

       --version
           Print a short version string and exit.

       --no-pager
           Do not pipe output into a pager.

       The following commands are understood:

       status
           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
           systemd-timesyncd.service unit is enabled. Even if this command
           shows the status as off, a different service might still
           synchronize the clock with the network.

       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
           timezones 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-timezones
           List available time zones, one per line. Entries from the list
           can be set as the system timezone 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 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
           --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 network time
           synchronization is active and enabled (if available). This
           enables and starts, or disables and stops the
           systemd-timesyncd.service 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: systemctl enable --now systemd-timesyncd.service
           and systemctl disable --now systemd-timesyncd.service, but is
           protected by a different access policy.

           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,
           systemd-timesyncd.service does more than just network time
           synchronization, as it ensures a monotonic clock on systems
           without RTC even if no network is available. See
           systemd-timesyncd.service(8) for details about this.

EXIT STATUS         top

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

ENVIRONMENT         top

       $SYSTEMD_PAGER
           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.

       $SYSTEMD_LESS
           Override the default options passed to less ("FRSXMK").

EXAMPLES         top

       Show current settings:

           $ 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

       Enable network time synchronization:

           $ 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 ===

           $ 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
           ...

SEE ALSO         top

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

COLOPHON         top

       This page is part of the systemd (systemd system and service manager)
       project.  Information about the project can be found at 
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have a bug
       report for this manual page, see 
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.  This
       page was obtained from the project's upstream Git repository 
       ⟨https://github.com/systemd/systemd.git⟩ on 2016-08-07.  If you dis‐
       cover any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail
       to man-pages@man7.org

systemd 231                                                   TIMEDATECTL(1)