1TIMEDATECTL(1)                    timedatectl                   TIMEDATECTL(1)
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NAME

6       timedatectl - Control the system time and date
7

SYNOPSIS

9       timedatectl [OPTIONS...] {COMMAND}
10

DESCRIPTION

12       timedatectl may be used to query and change the system clock and its
13       settings.
14
15       Use systemd-firstboot(1) to initialize the system time zone for mounted
16       (but not booted) system images.
17
18       timedatectl may be used to show the current status of systemd-
19       timesyncd.service(8).
20

OPTIONS

22       The following options are understood:
23
24       --no-ask-password
25           Do not query the user for authentication for privileged operations.
26
27       --adjust-system-clock
28           If set-local-rtc is invoked and this option is passed, the system
29           clock is synchronized from the RTC again, taking the new setting
30           into account. Otherwise, the RTC is synchronized from the system
31           clock.
32
33       --monitor
34           If timesync-status is invoked and this option is passed, then
35           timedatectl monitors the status of systemd-timesyncd.service(8) and
36           updates the outputs. Use Ctrl-C to terminate the monitoring.
37
38       -a, -all
39           When showing properties of systemd-timesyncd.service(8), show all
40           properties regardless of whether they are set or not.
41
42       -p, --property=
43           When showing properties of systemd-timesyncd.service(8), limit
44           display to certain properties as specified as argument. If not
45           specified, all set properties are shown. The argument should be a
46           property name, such as "ServerName". If specified more than once,
47           all properties with the specified names are shown.
48
49       --value
50           When printing properties with show-timesync, only print the value,
51           and skip the property name and "=".
52
53       -H, --host=
54           Execute the operation remotely. Specify a hostname, or a username
55           and hostname separated by "@", to connect to. The hostname may
56           optionally be suffixed by a container name, separated by ":", which
57           connects directly to a specific container on the specified host.
58           This will use SSH to talk to the remote machine manager instance.
59           Container names may be enumerated with machinectl -H HOST.
60
61       -M, --machine=
62           Execute operation on a local container. Specify a container name to
63           connect to.
64
65       -h, --help
66           Print a short help text and exit.
67
68       --version
69           Print a short version string and exit.
70
71       --no-pager
72           Do not pipe output into a pager.
73

COMMANDS

75       The following commands are understood:
76
77       status
78           Show current settings of the system clock and RTC, including
79           whether network time synchronization through
80           systemd-timesyncd.service is active. Even if it is inactive, a
81           different service might still synchronize the clock. If no command
82           is specified, this is the implied default.
83
84       show
85           Show the same information as status, but in machine readable form.
86           This command is intended to be used whenever computer-parsable
87           output is required. Use status if you are looking for formatted
88           human-readable output.
89
90           By default, empty properties are suppressed. Use --all to show
91           those too. To select specific properties to show, use --property=.
92
93       set-time [TIME]
94           Set the system clock to the specified time. This will also update
95           the RTC time accordingly. The time may be specified in the format
96           "2012-10-30 18:17:16".
97
98       set-timezone [TIMEZONE]
99           Set the system time zone to the specified value. Available
100           timezones can be listed with list-timezones. If the RTC is
101           configured to be in the local time, this will also update the RTC
102           time. This call will alter the /etc/localtime symlink. See
103           localtime(5) for more information.
104
105       list-timezones
106           List available time zones, one per line. Entries from the list can
107           be set as the system timezone with set-timezone.
108
109       set-local-rtc [BOOL]
110           Takes a boolean argument. If "0", the system is configured to
111           maintain the RTC in universal time. If "1", it will maintain the
112           RTC in local time instead. Note that maintaining the RTC in the
113           local timezone is not fully supported and will create various
114           problems with time zone changes and daylight saving adjustments. If
115           at all possible, keep the RTC in UTC mode. Note that invoking this
116           will also synchronize the RTC from the system clock, unless
117           --adjust-system-clock is passed (see above). This command will
118           change the 3rd line of /etc/adjtime, as documented in hwclock(8).
119
120       set-ntp [BOOL]
121           Takes a boolean argument. Controls whether network time
122           synchronization is active and enabled (if available). If the
123           argument is true, this enables and starts the first existed service
124           listed in the environment variable $SYSTEMD_TIMEDATED_NTP_SERVICES
125           of systemd-timedated.service. If the argument is false, then this
126           disables and stops the all services listed in
127           $SYSTEMD_TIMEDATED_NTP_SERVICES.
128
129   systemd-timesyncd Commands
130       The following commands are specific to systemd-timesyncd.service(8).
131
132       timesync-status
133           Show current status of systemd-timesyncd.service(8). If --monitor
134           is specified, then this will monitor the status updates.
135
136       show-timesync
137           Show the same information as timesync-status, but in machine
138           readable form. This command is intended to be used whenever
139           computer-parsable output is required. Use timesync-status if you
140           are looking for formatted human-readable output.
141
142           By default, empty properties are suppressed. Use --all to show
143           those too. To select specific properties to show, use --property=.
144

EXIT STATUS

146       On success, 0 is returned, a non-zero failure code otherwise.
147

ENVIRONMENT

149       $SYSTEMD_PAGER
150           Pager to use when --no-pager is not given; overrides $PAGER. If
151           neither $SYSTEMD_PAGER nor $PAGER are set, a set of well-known
152           pager implementations are tried in turn, including less(1) and
153           more(1), until one is found. If no pager implementation is
154           discovered no pager is invoked. Setting this environment variable
155           to an empty string or the value "cat" is equivalent to passing
156           --no-pager.
157
158       $SYSTEMD_LESS
159           Override the options passed to less (by default "FRSXMK").
160
161       $SYSTEMD_LESSCHARSET
162           Override the charset passed to less (by default "utf-8", if the
163           invoking terminal is determined to be UTF-8 compatible).
164

EXAMPLES

166       Show current settings:
167
168           $ timedatectl
169                          Local time: Thu 2017-09-21 16:08:56 CEST
170                      Universal time: Thu 2017-09-21 14:08:56 UTC
171                            RTC time: Thu 2017-09-21 14:08:56
172                           Time zone: Europe/Warsaw (CEST, +0200)
173           System clock synchronized: yes
174                         NTP service: active
175                     RTC in local TZ: no
176
177       Enable network time synchronization:
178
179           $ timedatectl set-ntp true
180           ==== AUTHENTICATING FOR org.freedesktop.timedate1.set-ntp ===
181           Authentication is required to control whether network time synchronization shall be enabled.
182           Authenticating as: user
183           Password: ********
184           ==== AUTHENTICATION COMPLETE ===
185
186
187
188           $ systemctl status systemd-timesyncd.service
189           ● systemd-timesyncd.service - Network Time Synchronization
190              Loaded: loaded (/usr/lib/systemd/system/systemd-timesyncd.service; enabled)
191              Active: active (running) since Mo 2015-03-30 14:20:38 CEST; 5s ago
192                Docs: man:systemd-timesyncd.service(8)
193            Main PID: 595 (systemd-timesyn)
194              Status: "Using Time Server 216.239.38.15:123 (time4.google.com)."
195              CGroup: /system.slice/systemd-timesyncd.service
196                      └─595 /usr/lib/systemd/systemd-timesyncd
197           ...
198
199       Show current status of systemd-timesyncd.service(8):
200
201           $ timedatectl timesync-status
202                  Server: 216.239.38.15 (time4.google.com)
203           Poll interval: 1min 4s (min: 32s; max 34min 8s)
204                    Leap: normal
205                 Version: 4
206                 Stratum: 1
207               Reference: GPS
208               Precision: 1us (-20)
209           Root distance: 335us (max: 5s)
210                  Offset: +316us
211                   Delay: 349us
212                  Jitter: 0
213            Packet count: 1
214               Frequency: -8.802ppm
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216

SEE ALSO

218       systemd(1), hwclock(8), date(1), localtime(5), systemctl(1), systemd-
219       timedated.service(8), systemd-timesyncd.service(8), systemd-
220       firstboot(1)
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224systemd 239                                                     TIMEDATECTL(1)
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