timedatectl — Control the system time and date
timedatectl [OPTIONS...] {COMMAND}
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.
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¶--version¶--no-pager¶Do not pipe output into a pager.
The following commands are understood:
Show current settings of the system clock and RTC.
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 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.
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).
Takes a boolean argument. Controls whether NTP based network time synchronization is enabled (if available).
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
...