TIMEDATECTL(1)

  .SH "NAME" timedatectl - Control the system time and date
  .SH "SYNOPSIS"
    .HP u
      timedatectl [OPTIONS...] {COMMAND}

  .SH "DESCRIPTION"

    .PP timedatectl may be used to query and change the system clock and its settings.
    .PP Use systemd-firstboot(1) to initialize the system time zone for mounted (but not booted) system images.
    .PP timedatectl may be used to show the current status of systemd-timesyncd.service(8).

  .SH "OPTIONS"

    .PP The following options are understood:

      .PP --no-ask-password

            Do not query the user for authentication for privileged operations.
          .RE
          .PP --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.
              .RE
              .PP --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.
                  .RE
                  .PP -a, -all

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

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

                              .RE
                                  .PP -M, --machine=

                                      Execute operation on a local container. Specify a container name to connect to.

                                  .RE
                                      .PP -h, --help

                                          Print a short help text and exit.
                                      .RE
                                          .PP --version

                                              Print a short version string and exit.

                                          .RE
                                              .PP --no-pager

                                                  Do not pipe output into a pager.

                                              .RE

                                              .SH "COMMANDS"

                                                .PP The following commands are understood:

                                                  .PP 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.
                                                      .RE
                                                      .PP 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=.
                                                          .RE
                                                          .PP 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".
                                                              .RE
                                                              .PP 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.
                                                                  .RE
                                                                  .PP list-timezones

                                                                        List available time zones, one per line. Entries from the list can be set as the system timezone with set-timezone.
                                                                      .RE
                                                                      .PP 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).
                                                                          .RE
                                                                          .PP 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.
                                                                              .RE

                                                                            .SS "systemd-timesyncd Commands"

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

                                                                                .PP timesync-status

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

                                                                                  .SH "EXIT STATUS"

                                                                                    .PP On success, 0 is returned, a non-zero failure code otherwise.

                                                                                  .SH "ENVIRONMENT"

                                                                                    .PP $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.
                                                                                        .RE
                                                                                        .PP $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.
                                                                                            .RE
                                                                                            .PP $SYSTEMD_LESSCHARSET

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

                                                                                              .SH "EXAMPLES"

                                                                                                .PP 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

                                                                                                .PP 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 (/usr/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 /usr/lib/systemd/systemd-timesyncd
                                                                                                ...

                                                                                                .PP 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

                                                                                              .SH "SEE ALSO"

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