TIMEDATECTL(1)                                  timedatectl                                  TIMEDATECTL(1)

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 port ssh is listening on, seperated
           by ":", and then 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. Put IPv6 addresses in
           brackets.

       -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").

           If the value of $SYSTEMD_LESS does not include "K", and the pager that is invoked is less,
           Ctrl+C will be ignored by the executable. This allows less to handle Ctrl+C itself.

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

       $SYSTEMD_COLORS
           The value must be a boolean. Controls whether colorized output should be generated. This can be
           specified to override the decision that systemd makes based on $TERM and what the console is
           connected to.

       $SYSTEMD_URLIFY
           The value must be a boolean. Controls whether clickable links should be generated in the output
           for terminal emulators supporting this. This can be specified to override the decision that
           systemd makes based on $TERM and other conditions.

       $SYSTEMD_PAGERSECURE
           Takes a boolean argument. When true, the "secure" mode of the pager is enabled; if false,
           disabled. If $SYSTEMD_PAGERSECURE is not set at all, secure mode is enabled if the effective UID
           is not the same as the owner of the login session, see geteuid(2) and sd_pid_get_owner_uid(3).
           In secure mode, LESSSECURE=1 will be set when invoking the pager, and the pager shall disable
           commands that open or create new files or start new subprocesses. When $SYSTEMD_PAGERSECURE is
           not set at all, pagers which are not known to implement secure mode will not be used. (Currently
           only less(1) implements secure mode.)

           Note: when commands are invoked with elevated privileges, for example under sudo(8) or
           pkexec(1), care must be taken to ensure that unintended interactive features are not enabled.
           "Secure" mode for the pager may be enabled automatically as describe above. Setting
           SYSTEMD_PAGERSECURE=0 or not removing it from the inherited environment allows the user to
           invoke arbitrary commands. Note that if the $SYSTEMD_PAGER or $PAGER variables are to be
           honoured, $SYSTEMD_PAGERSECURE must be set too. It might be reasonable to completly disable the
           pager using --no-pager instead.

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)

systemd 241                                                                                  TIMEDATECTL(1)

timedatectl [OPTIONS...] COMMAND ...

Query or change system time and date settings.

  -h --help                Show this help message
     --version             Show package version
     --no-pager            Do not pipe output into a pager
     --no-ask-password     Do not prompt for password
  -H --host=[USER@]HOST    Operate on remote host
  -M --machine=CONTAINER   Operate on local container
     --adjust-system-clock Adjust system clock when changing local RTC mode
     --monitor             Monitor status of systemd-timesyncd
  -p --property=NAME       Show only properties by this name
  -a --all                 Show all properties, including empty ones
     --value               When showing properties, only print the value

Commands:
  status                   Show current time settings
  show                     Show properties of systemd-timedated
  set-time TIME            Set system time
  set-timezone ZONE        Set system time zone
  list-timezones           Show known time zones
  set-local-rtc BOOL       Control whether RTC is in local time
  set-ntp BOOL             Enable or disable network time synchronization

systemd-timesyncd Commands:
  timesync-status          Show status of systemd-timesyncd
  show-timesync            Show properties of systemd-timesyncd

See the timedatectl(1) man page for details.