1 <?xml version='
1.0'
?> <!--*-nxml-*-->
2 <!DOCTYPE refentry PUBLIC
"-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
4 <!-- SPDX-License-Identifier: LGPL-2.1+ -->
6 <refentry id=
"timedatectl" conditional='ENABLE_TIMEDATECTL'
7 xmlns:
xi=
"http://www.w3.org/2001/XInclude">
10 <title>timedatectl
</title>
11 <productname>systemd
</productname>
15 <refentrytitle>timedatectl
</refentrytitle>
16 <manvolnum>1</manvolnum>
20 <refname>timedatectl
</refname>
21 <refpurpose>Control the system time and date
</refpurpose>
26 <command>timedatectl
</command>
27 <arg choice=
"opt" rep=
"repeat">OPTIONS
</arg>
28 <arg choice=
"req">COMMAND
</arg>
33 <title>Description
</title>
35 <para><command>timedatectl
</command> may be used to query and change the system clock and its settings,
36 and enable or disable time synchronization services.
</para>
39 <citerefentry><refentrytitle>systemd-firstboot
</refentrytitle><manvolnum>1</manvolnum></citerefentry>
40 to initialize the system time zone for mounted (but not booted)
43 <para><command>timedatectl
</command> may be used to show the current status of time synchronization
45 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
51 <title>Commands
</title>
53 <para>The following commands are understood:
</para>
57 <term><command>status
</command></term>
59 <listitem><para>Show current settings of the system clock and RTC, including whether network time
60 synchronization is active. If no command is specified, this is the implied default.
65 <term><command>show
</command></term>
67 <listitem><para>Show the same information as
<option>status
</option>, but in machine readable form.
68 This command is intended to be used whenever computer-parsable output is required.
69 Use
<option>status
</option> if you are looking for formatted human-readable output.
</para>
70 <para>By default, empty properties are suppressed. Use
<option>--all
</option> to show those too.
71 To select specific properties to show, use
<option>--property=
</option>.
</para></listitem>
75 <term><command>set-time [TIME]
</command></term>
77 <listitem><para>Set the system clock to the specified time.
78 This will also update the RTC time accordingly. The time may
79 be specified in the format
"2012-10-30
80 18:17:16".
</para></listitem>
84 <term><command>set-timezone [TIMEZONE]
</command></term>
86 <listitem><para>Set the system time zone to the specified
87 value. Available timezones can be listed with
88 <command>list-timezones
</command>. If the RTC is configured to
89 be in the local time, this will also update the RTC time. This
90 call will alter the
<filename>/etc/localtime
</filename>
92 <citerefentry><refentrytitle>localtime
</refentrytitle><manvolnum>5</manvolnum></citerefentry>
93 for more information.
</para></listitem>
97 <term><command>list-timezones
</command></term>
99 <listitem><para>List available time zones, one per line.
100 Entries from the list can be set as the system timezone with
101 <command>set-timezone
</command>.
</para></listitem>
105 <term><command>set-local-rtc [BOOL]
</command></term>
107 <listitem><para>Takes a boolean argument. If
108 <literal>0</literal>, the system is configured to maintain the
109 RTC in universal time. If
<literal>1</literal>, it will
110 maintain the RTC in local time instead. Note that maintaining
111 the RTC in the local timezone is not fully supported and will
112 create various problems with time zone changes and daylight
113 saving adjustments. If at all possible, keep the RTC in UTC
114 mode. Note that invoking this will also synchronize the RTC
115 from the system clock, unless
116 <option>--adjust-system-clock
</option> is passed (see above).
117 This command will change the
3rd line of
118 <filename>/etc/adjtime
</filename>, as documented in
119 <citerefentry project='man-pages'
><refentrytitle>hwclock
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
124 <term><command>set-ntp [BOOL]
</command></term>
126 <listitem><para>Takes a boolean argument. Controls whether network time synchronization is active and
127 enabled (if available). If the argument is true, this enables and starts the first existing network
128 synchronization service. If the argument is false, then this disables and stops the known network
129 synchronization services. The way that the list of services is built is described below.
</para>
136 <title>systemd-timesyncd Commands
</title>
138 <para>The following commands are specific to
139 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
144 <term><command>timesync-status
</command></term>
146 <listitem><para>Show current status of
147 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
148 If
<option>--monitor
</option> is specified, then this will monitor the status updates.
</para></listitem>
152 <term><command>show-timesync
</command></term>
154 <listitem><para>Show the same information as
<option>timesync-status
</option>, but in machine readable form.
155 This command is intended to be used whenever computer-parsable output is required.
156 Use
<option>timesync-status
</option> if you are looking for formatted human-readable output.
</para>
157 <para>By default, empty properties are suppressed. Use
<option>--all
</option> to show those too.
158 To select specific properties to show, use
<option>--property=
</option>.
</para></listitem>
162 <term><command>ntp-servers
<replaceable>INTERFACE
</replaceable> <replaceable>SERVER
</replaceable>…
</command></term>
164 <listitem><para>Set the interface specific NTP servers. This command can be used only when the
165 interface is managed by
<command>systemd-networkd
</command>.
</para></listitem>
169 <term><command>revert
<replaceable>INTERFACE
</replaceable></command></term>
171 <listitem><para>Revert the interface specific NTP servers. This command can be used only when
172 the interface is managed by
<command>systemd-networkd
</command>.
</para></listitem>
181 <title>Options
</title>
183 <para>The following options are understood:
</para>
187 <term><option>--no-ask-password
</option></term>
189 <listitem><para>Do not query the user for authentication for
190 privileged operations.
</para></listitem>
194 <term><option>--adjust-system-clock
</option></term>
196 <listitem><para>If
<command>set-local-rtc
</command> is invoked
197 and this option is passed, the system clock is synchronized
198 from the RTC again, taking the new setting into account.
199 Otherwise, the RTC is synchronized from the system
200 clock.
</para></listitem>
204 <term><option>--monitor
</option></term>
206 <listitem><para>If
<command>timesync-status
</command> is invoked and this option is passed, then
207 <command>timedatectl
</command> monitors the status of
208 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>
209 and updates the outputs. Use
<keycombo><keycap>Ctrl
</keycap><keycap>C
</keycap></keycombo> to terminate the
210 monitoring.
</para></listitem>
214 <term><option>-a
</option></term>
215 <term><option>--all
</option></term>
217 <listitem><para>When showing properties of
218 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
219 show all properties regardless of whether they are set or not.
</para></listitem>
223 <term><option>-p
</option></term>
224 <term><option>--property=
</option></term>
226 <listitem><para>When showing properties of
227 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
228 limit display to certain properties as specified as argument. If not specified, all set properties are shown.
229 The argument should be a property name, such as
<literal>ServerName
</literal>. If specified more than once,
230 all properties with the specified names are shown.
</para></listitem>
234 <term><option>--value
</option></term>
237 <para>When printing properties with
<command>show-timesync
</command>, only print the value, and skip the
238 property name and
<literal>=
</literal>.
</para></listitem>
241 <xi:include href=
"user-system-options.xml" xpointer=
"host" />
242 <xi:include href=
"user-system-options.xml" xpointer=
"machine" />
244 <xi:include href=
"standard-options.xml" xpointer=
"help" />
245 <xi:include href=
"standard-options.xml" xpointer=
"version" />
246 <xi:include href=
"standard-options.xml" xpointer=
"no-pager" />
251 <title>Exit status
</title>
253 <para>On success,
0 is returned, a non-zero failure code otherwise.
</para>
256 <xi:include href=
"less-variables.xml" />
259 <title>Examples
</title>
260 <para>Show current settings:
261 <programlisting>$ timedatectl
262 Local time: Thu
2017-
09-
21 16:
08:
56 CEST
263 Universal time: Thu
2017-
09-
21 14:
08:
56 UTC
264 RTC time: Thu
2017-
09-
21 14:
08:
56
265 Time zone: Europe/Warsaw (CEST, +
0200)
266 System clock synchronized: yes
268 RTC in local TZ: no
</programlisting>
271 <para>Enable network time synchronization:
272 <programlisting>$ timedatectl set-ntp true
273 ==== AUTHENTICATING FOR org.freedesktop.timedate1.set-ntp ===
274 Authentication is required to control whether network time synchronization shall be enabled.
275 Authenticating as: user
277 ==== AUTHENTICATION COMPLETE ===
</programlisting>
279 <programlisting>$ systemctl status systemd-timesyncd.service
280 ● systemd-timesyncd.service - Network Time Synchronization
281 Loaded: loaded (/usr/lib/systemd/system/systemd-timesyncd.service; enabled)
282 Active: active (running) since Mo
2015-
03-
30 14:
20:
38 CEST;
5s ago
283 Docs: man:systemd-timesyncd.service(
8)
284 Main PID:
595 (systemd-timesyn)
285 Status:
"Using Time Server 216.239.38.15:123 (time4.google.com)."
286 CGroup: /system.slice/systemd-timesyncd.service
287 └─
595 /usr/lib/systemd/systemd-timesyncd
291 <para>Show current status of
292 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>:
293 <programlisting>$ timedatectl timesync-status
294 Server:
216.239.38.15 (time4.google.com)
295 Poll interval:
1min
4s (min:
32s; max
34min
8s)
301 Root distance:
335us (max:
5s)
306 Frequency: -
8.802ppm
</programlisting>
312 <title>See Also
</title>
314 <citerefentry><refentrytitle>systemd
</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
315 <citerefentry project='man-pages'
><refentrytitle>hwclock
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
316 <citerefentry project='man-pages'
><refentrytitle>date
</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
317 <citerefentry><refentrytitle>localtime
</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
318 <citerefentry><refentrytitle>systemctl
</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
319 <citerefentry><refentrytitle>systemd-timedated.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
320 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
321 <citerefentry><refentrytitle>systemd-firstboot
</refentrytitle><manvolnum>1</manvolnum></citerefentry>