timedatectl

Control the system time and date

TLDR

Check the current system clock time

>_ timedatectl
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Set the local time of the system clock directly

>_ timedatectl set-time ["yyyy-MM-dd hh:mm:ss"]
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List available timezones

>_ timedatectl list-timezones
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Set the system timezone

>_ timedatectl set-timezone [timezone]
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Enable Network Time Protocol (NTP) synchronization

>_ timedatectl set-ntp on
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SYNOPSIS

' timedatectl [OPTIONS...] {COMMAND} 'u 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, separated 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) .

EXAMPLES

Show current settings:


.RS 4
$ 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 .RE

Enable network time synchronization:
.RS 4
$ 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 === .RE


.RS 4
$ 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 ... .RE

Show current status of systemd-timesyncd.service (8):
.RS 4
$ 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 .RE

SEE ALSO

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

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