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 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-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. 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 --no-pager.

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

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

EXAMPLES

       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: ********
	   ==== 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 237															    TIMEDATECTL(1)