1TIMEDATECTL(1) timedatectl TIMEDATECTL(1)
2
6 timedatectl - Control the system time and date
7
9 timedatectl [OPTIONS...] {COMMAND}
10
12 timedatectl may be used to query and change the system clock and its
13 settings, and enable or disable time synchronization services.
14 Use systemd-firstboot(1) to initialize the system time zone for mounted
16 (but not booted) system images.
17 timedatectl may be used to show the current status of time
19 synchronization services, for example systemd-timesyncd.service(8).
20
22 The following options are understood:
23 --no-ask-password
25 Do not query the user for authentication for privileged operations.
26 --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 --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 -a, --all
39 When showing properties of systemd-timesyncd.service(8), show all
40 properties regardless of whether they are set or not.
41 -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 --value
50 When printing properties with show-timesync, only print the value,
51 and skip the property name and "=".
52 -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 port ssh is listening on, separated by
57 ":", and then a container name, separated by "/", which connects
58 directly to a specific container on the specified host. This will
59 use SSH to talk to the remote machine manager instance. Container
60 names may be enumerated with machinectl -H HOST. Put IPv6 addresses
61 in brackets.
62 -M, --machine=
64 Execute operation on a local container. Specify a container name to
65 connect to.
66 -h, --help
68 Print a short help text and exit.
69 --version
71 Print a short version string and exit.
72 --no-pager
74 Do not pipe output into a pager.
75
77 The following commands are understood:
78 status
80 Show current settings of the system clock and RTC, including
81 whether network time synchronization is active. If no command is
82 specified, this is the implied default.
83 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 By default, empty properties are suppressed. Use --all to show
91 those too. To select specific properties to show, use --property=.
92 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 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 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 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 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 existing
124 network synchronization service. If the argument is false, then
125 this disables and stops the known network synchronization services.
126 The way that the list of services is built is described below.
127 systemd-timesyncd Commands
129 The following commands are specific to systemd-timesyncd.service(8).
130 timesync-status
132 Show current status of systemd-timesyncd.service(8). If --monitor
133 is specified, then this will monitor the status updates.
134 show-timesync
136 Show the same information as timesync-status, but in machine
137 readable form. This command is intended to be used whenever
138 computer-parsable output is required. Use timesync-status if you
139 are looking for formatted human-readable output.
140 By default, empty properties are suppressed. Use --all to show
142 those too. To select specific properties to show, use --property=.
143 ntp-servers INTERFACE SERVER...
145 Set the interface specific NTP servers. This command can be used
146 only when the interface is managed by systemd-networkd.
147 revert INTERFACE
149 Revert the interface specific NTP servers. This command can be used
150 only when the interface is managed by systemd-networkd.
151
153 On success, 0 is returned, a non-zero failure code otherwise.
154
156 $SYSTEMD_PAGER
157 Pager to use when --no-pager is not given; overrides $PAGER. If
158 neither $SYSTEMD_PAGER nor $PAGER are set, a set of well-known
159 pager implementations are tried in turn, including less(1) and
160 more(1), until one is found. If no pager implementation is
161 discovered no pager is invoked. Setting this environment variable
162 to an empty string or the value "cat" is equivalent to passing
163 --no-pager.
164 $SYSTEMD_LESS
166 Override the options passed to less (by default "FRSXMK").
167 Users might want to change two options in particular:
169 K
171 This option instructs the pager to exit immediately when Ctrl+C
172 is pressed. To allow less to handle Ctrl+C itself to switch
173 back to the pager command prompt, unset this option.
174 If the value of $SYSTEMD_LESS does not include "K", and the
176 pager that is invoked is less, Ctrl+C will be ignored by the
177 executable, and needs to be handled by the pager.
178 X
180 This option instructs the pager to not send termcap
181 initialization and deinitialization strings to the terminal. It
182 is set by default to allow command output to remain visible in
183 the terminal even after the pager exits. Nevertheless, this
184 prevents some pager functionality from working, in particular
185 paged output cannot be scrolled with the mouse.
186 See less(1) for more discussion.
188 $SYSTEMD_LESSCHARSET
190 Override the charset passed to less (by default "utf-8", if the
191 invoking terminal is determined to be UTF-8 compatible).
192 $SYSTEMD_COLORS
194 The value must be a boolean. Controls whether colorized output
195 should be generated. This can be specified to override the decision
196 that systemd makes based on $TERM and what the console is connected
197 to.
198 $SYSTEMD_URLIFY
200 The value must be a boolean. Controls whether clickable links
201 should be generated in the output for terminal emulators supporting
202 this. This can be specified to override the decision that systemd
203 makes based on $TERM and other conditions.
204
206 Show current settings:
207 $ timedatectl
209 Local time: Thu 2017-09-21 16:08:56 CEST
210 Universal time: Thu 2017-09-21 14:08:56 UTC
211 RTC time: Thu 2017-09-21 14:08:56
212 Time zone: Europe/Warsaw (CEST, +0200)
213 System clock synchronized: yes
214 NTP service: active
215 RTC in local TZ: no
216 Enable network time synchronization:
218 $ timedatectl set-ntp true
220 ==== AUTHENTICATING FOR org.freedesktop.timedate1.set-ntp ===
221 Authentication is required to control whether network time synchronization shall be enabled.
222 Authenticating as: user
223 Password: ********
224 ==== AUTHENTICATION COMPLETE ===
225 $ systemctl status systemd-timesyncd.service
229 ● systemd-timesyncd.service - Network Time Synchronization
230 Loaded: loaded (/usr/lib/systemd/system/systemd-timesyncd.service; enabled)
231 Active: active (running) since Mo 2015-03-30 14:20:38 CEST; 5s ago
232 Docs: man:systemd-timesyncd.service(8)
233 Main PID: 595 (systemd-timesyn)
234 Status: "Using Time Server 216.239.38.15:123 (time4.google.com)."
235 CGroup: /system.slice/systemd-timesyncd.service
236 └─595 /usr/lib/systemd/systemd-timesyncd
237 ...
238 Show current status of systemd-timesyncd.service(8):
240 $ timedatectl timesync-status
242 Server: 216.239.38.15 (time4.google.com)
243 Poll interval: 1min 4s (min: 32s; max 34min 8s)
244 Leap: normal
245 Version: 4
246 Stratum: 1
247 Reference: GPS
248 Precision: 1us (-20)
249 Root distance: 335us (max: 5s)
250 Offset: +316us
251 Delay: 349us
252 Jitter: 0
253 Packet count: 1
254 Frequency: -8.802ppm
255
258 systemd(1), hwclock(8), date(1), localtime(5), systemctl(1), systemd-
259 timedated.service(8), systemd-timesyncd.service(8), systemd-
260 firstboot(1)
261systemd 243 TIMEDATECTL(1)