timedatectl

       timedatectl [OPTIONS...] {COMMAND}

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

ENVIRONMENT
       $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
       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
            systemd-timesyncd.service - Network Time Synchronization
              Loaded: loaded (/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 /lib/systemd/systemd-timesyncd
           ...

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

systemd 229                                                     TIMEDATECTL(1)
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