TIMEDATECTL
Section: timedatectl (1)
Updated:
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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)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- EXIT STATUS
-
- ENVIRONMENT
-
- EXAMPLES
-
- SEE ALSO
-