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.
Use systemd-firstboot(1) to initialize the system time zone
for mounted (but not booted) system images.
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 (/usr/lib/systemd/system/chronyd.service; enabled)
Active: active (running) since Fri, 2012-11-02 09:36:25 CET; 5s ago
...