| TIMEDATECTL(1) - phpMan
TIMEDATECTL(1) timedatectl TIMEDATECTL(1)
NAME
timedatectl - Control the system time and date
SYNOPSIS
timedatectl [OPTIONS...] {COMMAND}
DESCRIPTION
timedatectl 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 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
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 (/lib/systemd/system/chronyd.service; enabled)
Active: active (running) since Fri, 2012-11-02 09:36:25 CET; 5s ago
...
SEE ALSO
systemd(1), hwclock(8), date(1), localtime(5), systemctl(1), systemd-timedated.service(8)
systemd 215 TIMEDATECTL(1)
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