timedatectl
Control the system time and date
see also :
hwclock - date
Synopsis
timedatectl [OPTIONS...]
{COMMAND}
add an example, a script, a trick and tips
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
...
description
timedatectl
may be used to query and change the system clock and its
settings.
options
The following
options are understood:
-h,
--help
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 the 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 synchronized 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 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
time zone 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 time zone 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).
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.
exit status
On success 0 is returned, a non-zero failure code otherwise.
timedatectl [options ]
{COMMAND}
see also
systemd,
hwclock , date , localtime,
systemctl, systemd-timedated.service