timedatectl — Control the system time and date
timedatectl [OPTIONS...] {COMMAND}
The following options are understood:
--help
, -h
Prints a short help text and exits.
--version
Prints a short version string and exits.
--no-pager
Do not pipe output into a pager.
--no-ask-password
Don't query the user for authentication for privileged operations.
-H
, --host
Execute operation remotely. Specify a hostname, or username and hostname separated by @, to connect to. This will use SSH to talk to a remote system.
--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 synchonized from the system clock.
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
time zones my 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 may selected 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 is not fully supported and
will create various problems with time
zone changes and daylight saving
adjustments. If at all possible use
RTC in UTC. 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).