timedatectl <root
TIMEDATECTL(1)                             timedatectl                             TIMEDATECTL(1)

NAME
       timedatectl - Control the system time and date

SYNOPSIS
       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 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
       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
            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 (/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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