The following options are understood:
Do not query the user for authentication for privileged
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
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 -HHOST.
Execute operation on a local container. Specify a container name
to connect to.
Print a short help text and exit.
Print a short version string and exit.
Do not pipe output into a pager.
The following commands are understood:
Show current settings of the system clock and RTC, including
whether network time synchronization is on. Note that whether
network time synchronization is on simply reflects whether the
systemd-timesyncd.service unit is enabled. Even if this command
shows the status as off, a different service might still
synchronize the clock with the network.
Set the system clock to the specified time. This will also update
the RTC time accordingly. The time may be specified in the format
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 available time zones, one per line. Entries from the list
can be set as the system timezone with set-timezone.
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).
Takes a boolean argument. Controls whether network time
synchronization is active and enabled (if available). This
enables and starts, or disables and stops the
systemd-timesyncd.service unit. It does not affect the state of
any other, unrelated network time synchronization services that
might be installed on the system. This command is hence mostly
equivalent to: systemctl enable --now systemd-timesyncd.service
and systemctl disable --now systemd-timesyncd.service, but is
protected by a different access policy.
Note that even if time synchronization is turned off with this
command, another unrelated system service might still synchronize
the clock with the network. Also note that, strictly speaking,
systemd-timesyncd.service does more than just network time
synchronization, as it ensures a monotonic clock on systems
without RTC even if no network is available. See
systemd-timesyncd.service(8) for details about this.
Pager to use when --no-pager is not given; overrides $PAGER. If
neither $SYSTEMD_PAGER nor $PAGER are set, a set of well-known
pager implementations are tried in turn, including less(1) and
more(1), until one is found. If no pager implementation is
discovered no pager is invoked. Setting this environment variable
to an empty string or the value "cat" is equivalent to passing
Override the options passed to less (by default "FRSXMK").
Override the charset passed to less (by default "utf-8", if the
invoking terminal is determined to be UTF-8 compatible).
Show current settings:
Local time: Di 2015-04-07 16:26:56 CEST
Universal time: Di 2015-04-07 14:26:56 UTC
RTC time: Di 2015-04-07 14:26:56
Time zone: Europe/Berlin (CEST, +0200)
Network time on: yes
NTP synchronized: yes
RTC in local TZ: no
Enable network time synchronization:
$ 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
==== AUTHENTICATION COMPLETE ===
$ systemctl status systemd-timesyncd.service
● systemd-timesyncd.service - Network Time Synchronization
Loaded: loaded (/usr/lib/systemd/system/systemd-timesyncd.service; enabled)
Active: active (running) since Mo 2015-03-30 14:20:38 CEST; 5s ago
Main PID: 595 (systemd-timesyn)
Status: "Using Time Server 184.108.40.206:123 (time4.google.com)."
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systemd 233 TIMEDATECTL(1)