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CentOS 7.0 - man page for timedatectl (centos section 1)

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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 settings.

       The following options are understood:

       -h, --help
	   Prints a short help text and exits.

	   Prints a short version string and exits.

	   Do not pipe output into a pager.

	   Do not query the user for authentication for privileged operations.

       -P, --privileged
	   Acquire privileges via PolicyKit before executing the operation.

       -H, --host
	   Execute the operation remotely. Specify a hostname, or username and hostname separated
	   by "@", to connect to. This will use SSH to talk to a remote system.

	   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.

       The following commands are understood:

	   Show current settings of the system clock and RTC.

       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 NTP based network time synchronization is
	   enabled (if available).

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

	   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.

       Show current settings:

	   $ timedatectl
		 Local time: Fri, 2012-11-02 09:26:46 CET
	     Universal time: Fri, 2012-11-02 08:26:46 UTC
		   RTC time: Fri, 2012-11-02 08:26:45
		   Timezone: Europe/Warsaw
		 UTC offset: +0100
		NTP enabled: no
	   NTP synchronized: no
	    RTC in local TZ: no
		 DST active: no
	    Last DST change: CEST -> CET, DST became inactive
			     Sun, 2012-10-28 02:59:59 CEST
			     Sun, 2012-10-28 02:00:00 CET
	    Next DST change: CET -> CEST, DST will become active
			     the clock will jump one hour forward
			     Sun, 2013-03-31 01:59:59 CET
			     Sun, 2013-03-31 03:00:00 CEST

       Enable an NTP daemon (chronyd):

	   $ 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 chronyd.service
	   chronyd.service - NTP client/server
		     Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled)
		     Active: active (running) since Fri, 2012-11-02 09:36:25 CET; 5s ago

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

systemd 208									   TIMEDATECTL(1)
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