TIMEDATECTL(1)timedatectlTIMEDATECTL(1)NAMEtimedatectl - Control the system time and date
SYNOPSIStimedatectl [OPTIONS...] {COMMAND}
DESCRIPTIONtimedatectl may be used to query and change the system clock and its
settings.
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 username and
hostname separated by "@", to connect to. This will use SSH to talk
to the remote machine manager instance.
-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.
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 NTP based network time
synchronization is enabled (if available).
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: 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: ********
==== AUTHENTICATION COMPLETE ===
$ 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
...
SEE ALSOsystemd(1), hwclock(8), date(1), localtime(5), systemctl(1), systemd-
timedated.service(8)systemd 212TIMEDATECTL(1)
