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
<arg choice=
"opt" rep=
"repeat">OPTIONS
</arg> <arg choice=
"req">COMMAND
</arg></command>
31 <title>Description
</title>
33 <para><command>timedatectl
</command> may be used to query and
34 change the system clock and its settings.
</para>
37 <citerefentry><refentrytitle>systemd-firstboot
</refentrytitle><manvolnum>1</manvolnum></citerefentry>
38 to initialize the system time zone for mounted (but not booted)
41 <para><command>timedatectl
</command> may be used to show the current status of
42 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
48 <title>Options
</title>
50 <para>The following options are understood:
</para>
54 <term><option>--no-ask-password
</option></term>
56 <listitem><para>Do not query the user for authentication for
57 privileged operations.
</para></listitem>
61 <term><option>--adjust-system-clock
</option></term>
63 <listitem><para>If
<command>set-local-rtc
</command> is invoked
64 and this option is passed, the system clock is synchronized
65 from the RTC again, taking the new setting into account.
66 Otherwise, the RTC is synchronized from the system
67 clock.
</para></listitem>
71 <term><option>--monitor
</option></term>
73 <listitem><para>If
<command>timesync-status
</command> is invoked and this option is passed, then
74 <command>timedatectl
</command> monitors the status of
75 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>
76 and updates the outputs. Use
<keycombo><keycap>Ctrl
</keycap><keycap>C
</keycap></keycombo> to terminate the
77 monitoring.
</para></listitem>
81 <term><option>-a
</option></term>
82 <term><option>--all
</option></term>
84 <listitem><para>When showing properties of
85 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
86 show all properties regardless of whether they are set or not.
</para></listitem>
90 <term><option>-p
</option></term>
91 <term><option>--property=
</option></term>
93 <listitem><para>When showing properties of
94 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
95 limit display to certain properties as specified as argument. If not specified, all set properties are shown.
96 The argument should be a property name, such as
<literal>ServerName
</literal>. If specified more than once,
97 all properties with the specified names are shown.
</para></listitem>
101 <term><option>--value
</option></term>
104 <para>When printing properties with
<command>show-timesync
</command>, only print the value, and skip the
105 property name and
<literal>=
</literal>.
</para></listitem>
108 <xi:include href=
"user-system-options.xml" xpointer=
"host" />
109 <xi:include href=
"user-system-options.xml" xpointer=
"machine" />
111 <xi:include href=
"standard-options.xml" xpointer=
"help" />
112 <xi:include href=
"standard-options.xml" xpointer=
"version" />
113 <xi:include href=
"standard-options.xml" xpointer=
"no-pager" />
118 <title>Commands
</title>
120 <para>The following commands are understood:
</para>
124 <term><command>status
</command></term>
126 <listitem><para>Show current settings of the system clock and RTC,
127 including whether network time synchronization through
128 <filename>systemd-timesyncd.service
</filename> is active. Even if it is
129 inactive, a different service might still synchronize the clock.
130 If no command is specified, this is the implied default.
135 <term><command>show
</command></term>
137 <listitem><para>Show the same information as
<option>status
</option>, but in machine readable form.
138 This command is intended to be used whenever computer-parsable output is required.
139 Use
<option>status
</option> if you are looking for formatted human-readable output.
</para>
140 <para>By default, empty properties are suppressed. Use
<option>--all
</option> to show those too.
141 To select specific properties to show, use
<option>--property=
</option>.
</para></listitem>
145 <term><command>set-time [TIME]
</command></term>
147 <listitem><para>Set the system clock to the specified time.
148 This will also update the RTC time accordingly. The time may
149 be specified in the format
"2012-10-30
150 18:17:16".
</para></listitem>
154 <term><command>set-timezone [TIMEZONE]
</command></term>
156 <listitem><para>Set the system time zone to the specified
157 value. Available timezones can be listed with
158 <command>list-timezones
</command>. If the RTC is configured to
159 be in the local time, this will also update the RTC time. This
160 call will alter the
<filename>/etc/localtime
</filename>
162 <citerefentry><refentrytitle>localtime
</refentrytitle><manvolnum>5</manvolnum></citerefentry>
163 for more information.
</para></listitem>
167 <term><command>list-timezones
</command></term>
169 <listitem><para>List available time zones, one per line.
170 Entries from the list can be set as the system timezone with
171 <command>set-timezone
</command>.
</para></listitem>
175 <term><command>set-local-rtc [BOOL]
</command></term>
177 <listitem><para>Takes a boolean argument. If
178 <literal>0</literal>, the system is configured to maintain the
179 RTC in universal time. If
<literal>1</literal>, it will
180 maintain the RTC in local time instead. Note that maintaining
181 the RTC in the local timezone is not fully supported and will
182 create various problems with time zone changes and daylight
183 saving adjustments. If at all possible, keep the RTC in UTC
184 mode. Note that invoking this will also synchronize the RTC
185 from the system clock, unless
186 <option>--adjust-system-clock
</option> is passed (see above).
187 This command will change the
3rd line of
188 <filename>/etc/adjtime
</filename>, as documented in
189 <citerefentry project='man-pages'
><refentrytitle>hwclock
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
194 <term><command>set-ntp [BOOL]
</command></term>
196 <listitem><para>Takes a boolean argument. Controls whether network time synchronization is active
197 and enabled (if available). If the argument is true, this enables and starts the first existed
198 service listed in the environment variable
<varname>$SYSTEMD_TIMEDATED_NTP_SERVICES
</varname>
199 of
<filename>systemd-timedated.service
</filename>. If the argument is false, then this disables and
200 stops the all services listed in
<varname>$SYSTEMD_TIMEDATED_NTP_SERVICES
</varname>.
</para></listitem>
206 <title>systemd-timesyncd Commands
</title>
208 <para>The following commands are specific to
209 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
214 <term><command>timesync-status
</command></term>
216 <listitem><para>Show current status of
217 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
218 If
<option>--monitor
</option> is specified, then this will monitor the status updates.
</para></listitem>
222 <term><command>show-timesync
</command></term>
224 <listitem><para>Show the same information as
<option>timesync-status
</option>, but in machine readable form.
225 This command is intended to be used whenever computer-parsable output is required.
226 Use
<option>timesync-status
</option> if you are looking for formatted human-readable output.
</para>
227 <para>By default, empty properties are suppressed. Use
<option>--all
</option> to show those too.
228 To select specific properties to show, use
<option>--property=
</option>.
</para></listitem>
232 <term><command>ntp-servers
<replaceable>INTERFACE
</replaceable> <replaceable>SERVER
</replaceable>…
</command></term>
234 <listitem><para>Set the interface specific NTP servers. This command can be used only when the
235 interface is managed by
<command>systemd-networkd
</command>.
</para></listitem>
239 <term><command>revert
<replaceable>INTERFACE
</replaceable></command></term>
241 <listitem><para>Revert the interface specific NTP servers. This command can be used only when
242 the interface is managed by
<command>systemd-networkd
</command>.
</para></listitem>
251 <title>Exit status
</title>
253 <para>On success,
0 is returned, a non-zero failure
254 code otherwise.
</para>
257 <xi:include href=
"less-variables.xml" />
260 <title>Examples
</title>
261 <para>Show current settings:
262 <programlisting>$ timedatectl
263 Local time: Thu
2017-
09-
21 16:
08:
56 CEST
264 Universal time: Thu
2017-
09-
21 14:
08:
56 UTC
265 RTC time: Thu
2017-
09-
21 14:
08:
56
266 Time zone: Europe/Warsaw (CEST, +
0200)
267 System clock synchronized: yes
269 RTC in local TZ: no
</programlisting>
272 <para>Enable network time synchronization:
273 <programlisting>$ timedatectl set-ntp true
274 ==== AUTHENTICATING FOR org.freedesktop.timedate1.set-ntp ===
275 Authentication is required to control whether network time synchronization shall be enabled.
276 Authenticating as: user
278 ==== AUTHENTICATION COMPLETE ===
</programlisting>
280 <programlisting>$ systemctl status systemd-timesyncd.service
281 ● systemd-timesyncd.service - Network Time Synchronization
282 Loaded: loaded (/usr/lib/systemd/system/systemd-timesyncd.service; enabled)
283 Active: active (running) since Mo
2015-
03-
30 14:
20:
38 CEST;
5s ago
284 Docs: man:systemd-timesyncd.service(
8)
285 Main PID:
595 (systemd-timesyn)
286 Status:
"Using Time Server 216.239.38.15:123 (time4.google.com)."
287 CGroup: /system.slice/systemd-timesyncd.service
288 └─
595 /usr/lib/systemd/systemd-timesyncd
292 <para>Show current status of
293 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>:
294 <programlisting>$ timedatectl timesync-status
295 Server:
216.239.38.15 (time4.google.com)
296 Poll interval:
1min
4s (min:
32s; max
34min
8s)
302 Root distance:
335us (max:
5s)
307 Frequency: -
8.802ppm
</programlisting>
313 <title>See Also
</title>
315 <citerefentry><refentrytitle>systemd
</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
316 <citerefentry project='man-pages'
><refentrytitle>hwclock
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
317 <citerefentry project='man-pages'
><refentrytitle>date
</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
318 <citerefentry><refentrytitle>localtime
</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
319 <citerefentry><refentrytitle>systemctl
</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
320 <citerefentry><refentrytitle>systemd-timedated.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
321 <citerefentry><refentrytitle>systemd-timesyncd.service
</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
322 <citerefentry><refentrytitle>systemd-firstboot
</refentrytitle><manvolnum>1</manvolnum></citerefentry>