timedatectl

systemd
Developer Lennart Poettering lennart@poettering.net
timedatectl 1
timedatectl Control the system time and date
`timedatectl OPTIONS COMMAND`

## Description

`timedatectl` may be used to query and change the system clock and its settings.

## Options

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:

`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 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-timezones`

  List available time zones, one per line. Entries from the list may selected 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 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.

`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`.

## See Also

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