Provided by: systemd_239-7ubuntu10_amd64 bug

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.

       timedatectl may be used to show the current status of systemd-timesyncd.service(8).

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.

       --monitor
           If timesync-status is invoked and this option is passed, then timedatectl monitors the
           status of systemd-timesyncd.service(8) and updates the outputs. Use Ctrl-C to
           terminate the monitoring.

       -a, -all
           When showing properties of systemd-timesyncd.service(8), show all properties
           regardless of whether they are set or not.

       -p, --property=
           When showing properties of systemd-timesyncd.service(8), limit display to certain
           properties as specified as argument. If not specified, all set properties are shown.
           The argument should be a property name, such as "ServerName". If specified more than
           once, all properties with the specified names are shown.

       --value
           When printing properties with show-timesync, only print the value, and skip the
           property name and "=".

       -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.

COMMANDS

       The following commands are understood:

       status
           Show current settings of the system clock and RTC, including whether network time
           synchronization through systemd-timesyncd.service is active. Even if it is inactive, a
           different service might still synchronize the clock. If no command is specified, this
           is the implied default.

       show
           Show the same information as status, but in machine readable form. This command is
           intended to be used whenever computer-parsable output is required. Use status if you
           are looking for formatted human-readable output.

           By default, empty properties are suppressed. Use --all to show those too. To select
           specific properties to show, use --property=.

       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 network time synchronization is active and
           enabled (if available). If the argument is true, this enables and starts the first
           existed service listed in the environment variable $SYSTEMD_TIMEDATED_NTP_SERVICES of
           systemd-timedated.service. If the argument is false, then this disables and stops the
           all services listed in $SYSTEMD_TIMEDATED_NTP_SERVICES.

   systemd-timesyncd Commands
       The following commands are specific to systemd-timesyncd.service(8).

       timesync-status
           Show current status of systemd-timesyncd.service(8). If --monitor is specified, then
           this will monitor the status updates.

       show-timesync
           Show the same information as timesync-status, but in machine readable form. This
           command is intended to be used whenever computer-parsable output is required. Use
           timesync-status if you are looking for formatted human-readable output.

           By default, empty properties are suppressed. Use --all to show those too. To select
           specific properties to show, use --property=.

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. 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 --no-pager.

       $SYSTEMD_LESS
           Override the options passed to less (by default "FRSXMK").

       $SYSTEMD_LESSCHARSET
           Override the charset passed to less (by default "utf-8", if the invoking terminal is
           determined to be UTF-8 compatible).

EXAMPLES

       Show current settings:

           $ timedatectl
                          Local time: Thu 2017-09-21 16:08:56 CEST
                      Universal time: Thu 2017-09-21 14:08:56 UTC
                            RTC time: Thu 2017-09-21 14:08:56
                           Time zone: Europe/Warsaw (CEST, +0200)
           System clock synchronized: yes
                         NTP service: active
                     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
           Password: ********
           ==== AUTHENTICATION COMPLETE ===

           $ systemctl status systemd-timesyncd.service
           ● systemd-timesyncd.service - Network Time Synchronization
              Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled)
              Active: active (running) since Mo 2015-03-30 14:20:38 CEST; 5s ago
                Docs: man:systemd-timesyncd.service(8)
            Main PID: 595 (systemd-timesyn)
              Status: "Using Time Server 216.239.38.15:123 (time4.google.com)."
              CGroup: /system.slice/systemd-timesyncd.service
                      └─595 /lib/systemd/systemd-timesyncd
           ...

       Show current status of systemd-timesyncd.service(8):

           $ timedatectl timesync-status
                  Server: 216.239.38.15 (time4.google.com)
           Poll interval: 1min 4s (min: 32s; max 34min 8s)
                    Leap: normal
                 Version: 4
                 Stratum: 1
               Reference: GPS
               Precision: 1us (-20)
           Root distance: 335us (max: 5s)
                  Offset: +316us
                   Delay: 349us
                  Jitter: 0
            Packet count: 1
               Frequency: -8.802ppm

SEE ALSO

       systemd(1), hwclock(8), date(1), localtime(5), systemctl(1), systemd-timedated.service(8),
       systemd-timesyncd.service(8), systemd-firstboot(1)