TIMEDATECTL(1)                    timedatectl                   TIMEDATECTL(1)

       timedatectl - Control the system time and date

       timedatectl [OPTIONS...] {COMMAND}

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

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

       The following options are understood:

           Do not query the user for authentication for privileged operations.

           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

       -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.

           Print a short version string and exit.

           Do not pipe output into a pager.

       The following commands are understood:

           Show current settings of the system clock and RTC, including
           whether network time synchronization through
           systemd-timesyncd.service is active. Even if it is inactive, a
           different service might still synchronize the clock.

       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 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

           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.

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

           Pager to use when --no-pager is not given; overrides $PAGER. If
           neither $SYSTEMD_PAGER nor $PAGER are set, a set of well-known
           pager implementations are tried in turn, including less(1) and
           more(1), until one is found. If no pager implementation is
           discovered no pager is invoked. Setting this environment variable
           to an empty string or the value "cat" is equivalent to passing

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

           Override the charset passed to less (by default "utf-8", if the
           invoking terminal is determined to be UTF-8 compatible).

       Show current settings:

           $ timedatectl
                                 Local time: Thu 2017-09-21 16:08:56 CEST
                             Universal time: Thu 2017-09-21 14:08:56 UTC
                                   RTC time: Thu 2017-09-21 14:08:56
                                  Time zone: Europe/Warsaw (CEST, +0200)
                  System clock synchronized: yes
           systemd-timesyncd.service active: 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: ********

           $ 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 (time4.google.com)."
              CGroup: /system.slice/systemd-timesyncd.service
                      595 /lib/systemd/systemd-timesyncd

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

systemd 237                                                     TIMEDATECTL(1)

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