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1 | <?xml version='1.0'?> <!--*-nxml-*--> |
2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" | |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
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4 | |
5 | <!-- | |
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6 | SPDX-License-Identifier: LGPL-2.1+ |
7 | ||
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8 | This file is part of systemd. |
9 | ||
10 | Copyright 2012 Lennart Poettering | |
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11 | --> |
12 | ||
21ac6ff1 | 13 | <refentry id="timedatectl" conditional='ENABLE_TIMEDATED' |
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14 | xmlns:xi="http://www.w3.org/2001/XInclude"> |
15 | ||
16 | <refentryinfo> | |
17 | <title>timedatectl</title> | |
18 | <productname>systemd</productname> | |
19 | ||
20 | <authorgroup> | |
21 | <author> | |
22 | <contrib>Developer</contrib> | |
23 | <firstname>Lennart</firstname> | |
24 | <surname>Poettering</surname> | |
25 | <email>lennart@poettering.net</email> | |
26 | </author> | |
27 | </authorgroup> | |
28 | </refentryinfo> | |
29 | ||
30 | <refmeta> | |
31 | <refentrytitle>timedatectl</refentrytitle> | |
32 | <manvolnum>1</manvolnum> | |
33 | </refmeta> | |
34 | ||
35 | <refnamediv> | |
36 | <refname>timedatectl</refname> | |
37 | <refpurpose>Control the system time and date</refpurpose> | |
38 | </refnamediv> | |
39 | ||
40 | <refsynopsisdiv> | |
41 | <cmdsynopsis> | |
42 | <command>timedatectl <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="req">COMMAND</arg></command> | |
43 | </cmdsynopsis> | |
44 | </refsynopsisdiv> | |
45 | ||
46 | <refsect1> | |
47 | <title>Description</title> | |
48 | ||
49 | <para><command>timedatectl</command> may be used to query and | |
50 | change the system clock and its settings.</para> | |
51 | ||
52 | <para>Use | |
53 | <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
54 | to initialize the system time zone for mounted (but not booted) | |
55 | system images.</para> | |
56 | </refsect1> | |
57 | ||
58 | <refsect1> | |
59 | <title>Options</title> | |
60 | ||
61 | <para>The following options are understood:</para> | |
62 | ||
63 | <variablelist> | |
64 | <varlistentry> | |
65 | <term><option>--no-ask-password</option></term> | |
66 | ||
67 | <listitem><para>Do not query the user for authentication for | |
68 | privileged operations.</para></listitem> | |
69 | </varlistentry> | |
70 | ||
71 | <varlistentry> | |
72 | <term><option>--adjust-system-clock</option></term> | |
73 | ||
74 | <listitem><para>If <command>set-local-rtc</command> is invoked | |
75 | and this option is passed, the system clock is synchronized | |
76 | from the RTC again, taking the new setting into account. | |
77 | Otherwise, the RTC is synchronized from the system | |
78 | clock.</para></listitem> | |
79 | </varlistentry> | |
80 | ||
81 | <xi:include href="user-system-options.xml" xpointer="host" /> | |
82 | <xi:include href="user-system-options.xml" xpointer="machine" /> | |
83 | ||
84 | <xi:include href="standard-options.xml" xpointer="help" /> | |
85 | <xi:include href="standard-options.xml" xpointer="version" /> | |
86 | <xi:include href="standard-options.xml" xpointer="no-pager" /> | |
87 | </variablelist> | |
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88 | </refsect1> |
89 | ||
90 | <refsect1> | |
91 | <title>Commands</title> | |
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92 | |
93 | <para>The following commands are understood:</para> | |
94 | ||
95 | <variablelist> | |
96 | <varlistentry> | |
97 | <term><command>status</command></term> | |
98 | ||
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99 | <listitem><para>Show current settings of the system clock and RTC, |
100 | including whether network time synchronization through | |
101 | <filename>systemd-timesyncd.service</filename> is active. Even if it is | |
102 | inactive, a different service might still synchronize the clock. | |
24fcd009 | 103 | If no command is specified, this is the implied default. |
1b7ac91f | 104 | </para></listitem> |
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105 | </varlistentry> |
106 | ||
107 | <varlistentry> | |
108 | <term><command>set-time [TIME]</command></term> | |
109 | ||
110 | <listitem><para>Set the system clock to the specified time. | |
111 | This will also update the RTC time accordingly. The time may | |
112 | be specified in the format "2012-10-30 | |
113 | 18:17:16".</para></listitem> | |
114 | </varlistentry> | |
115 | ||
116 | <varlistentry> | |
117 | <term><command>set-timezone [TIMEZONE]</command></term> | |
118 | ||
119 | <listitem><para>Set the system time zone to the specified | |
120 | value. Available timezones can be listed with | |
121 | <command>list-timezones</command>. If the RTC is configured to | |
122 | be in the local time, this will also update the RTC time. This | |
123 | call will alter the <filename>/etc/localtime</filename> | |
124 | symlink. See | |
125 | <citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
126 | for more information.</para></listitem> | |
127 | </varlistentry> | |
128 | ||
129 | <varlistentry> | |
130 | <term><command>list-timezones</command></term> | |
131 | ||
132 | <listitem><para>List available time zones, one per line. | |
133 | Entries from the list can be set as the system timezone with | |
134 | <command>set-timezone</command>.</para></listitem> | |
135 | </varlistentry> | |
136 | ||
137 | <varlistentry> | |
138 | <term><command>set-local-rtc [BOOL]</command></term> | |
139 | ||
140 | <listitem><para>Takes a boolean argument. If | |
141 | <literal>0</literal>, the system is configured to maintain the | |
142 | RTC in universal time. If <literal>1</literal>, it will | |
143 | maintain the RTC in local time instead. Note that maintaining | |
144 | the RTC in the local timezone is not fully supported and will | |
145 | create various problems with time zone changes and daylight | |
146 | saving adjustments. If at all possible, keep the RTC in UTC | |
147 | mode. Note that invoking this will also synchronize the RTC | |
148 | from the system clock, unless | |
149 | <option>--adjust-system-clock</option> is passed (see above). | |
150 | This command will change the 3rd line of | |
151 | <filename>/etc/adjtime</filename>, as documented in | |
152 | <citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>. | |
153 | </para></listitem> | |
154 | </varlistentry> | |
155 | ||
156 | <varlistentry> | |
157 | <term><command>set-ntp [BOOL]</command></term> | |
158 | ||
2fc4f5bd | 159 | <listitem><para>Takes a boolean argument. Controls whether |
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160 | network time synchronization is active and enabled (if |
161 | available). This enables and starts, or disables and stops the | |
162 | <filename>systemd-timesyncd.service</filename> unit. It does | |
163 | not affect the state of any other, unrelated network time | |
164 | synchronization services that might be installed on the | |
165 | system. This command is hence mostly equivalent to: | |
166 | <command>systemctl enable --now | |
167 | systemd-timesyncd.service</command> and <command>systemctl | |
168 | disable --now systemd-timesyncd.service</command>, but is | |
169 | protected by a different access policy.</para> | |
170 | ||
171 | <para>Note that even if time synchronization is turned off | |
81eb21b9 | 172 | with this command, another unrelated system service might |
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173 | still synchronize the clock with the network. Also note that, |
174 | strictly speaking, | |
8731be1a | 175 | <filename>systemd-timesyncd.service</filename> does more than |
b938cb90 | 176 | just network time synchronization, as it ensures a monotonic |
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177 | clock on systems without RTC even if no network is |
178 | available. See | |
179 | <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
180 | for details about this.</para></listitem> | |
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181 | </varlistentry> |
182 | ||
183 | </variablelist> | |
184 | ||
185 | </refsect1> | |
186 | ||
187 | <refsect1> | |
188 | <title>Exit status</title> | |
189 | ||
190 | <para>On success, 0 is returned, a non-zero failure | |
191 | code otherwise.</para> | |
192 | </refsect1> | |
193 | ||
194 | <xi:include href="less-variables.xml" /> | |
195 | ||
196 | <refsect1> | |
197 | <title>Examples</title> | |
198 | <para>Show current settings: | |
199 | <programlisting>$ timedatectl | |
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200 | Local time: Thu 2017-09-21 16:08:56 CEST |
201 | Universal time: Thu 2017-09-21 14:08:56 UTC | |
202 | RTC time: Thu 2017-09-21 14:08:56 | |
203 | Time zone: Europe/Warsaw (CEST, +0200) | |
204 | System clock synchronized: yes | |
205 | systemd-timesyncd.service active: yes | |
206 | RTC in local TZ: no</programlisting> | |
798d3a52 | 207 | </para> |
be1015dd | 208 | |
b90930c7 | 209 | <para>Enable network time synchronization: |
798d3a52 | 210 | <programlisting>$ timedatectl set-ntp true |
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211 | ==== AUTHENTICATING FOR org.freedesktop.timedate1.set-ntp === |
212 | Authentication is required to control whether network time synchronization shall be enabled. | |
213 | Authenticating as: user | |
214 | Password: ******** | |
9fccdb0f | 215 | ==== AUTHENTICATION COMPLETE ===</programlisting> |
be1015dd | 216 | |
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217 | <programlisting>$ systemctl status systemd-timesyncd.service |
218 | ● systemd-timesyncd.service - Network Time Synchronization | |
12b42c76 | 219 | Loaded: loaded (/usr/lib/systemd/system/systemd-timesyncd.service; enabled) |
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220 | Active: active (running) since Mo 2015-03-30 14:20:38 CEST; 5s ago |
221 | Docs: man:systemd-timesyncd.service(8) | |
222 | Main PID: 595 (systemd-timesyn) | |
223 | Status: "Using Time Server 216.239.38.15:123 (time4.google.com)." | |
224 | CGroup: /system.slice/systemd-timesyncd.service | |
12b42c76 | 225 | └─595 /usr/lib/systemd/systemd-timesyncd |
1eecafb8 | 226 | …</programlisting> |
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227 | </para> |
228 | </refsect1> | |
229 | ||
230 | <refsect1> | |
231 | <title>See Also</title> | |
232 | <para> | |
233 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
234 | <citerefentry project='man-pages'><refentrytitle>hwclock</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
235 | <citerefentry project='man-pages'><refentrytitle>date</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
236 | <citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
237 | <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
238 | <citerefentry><refentrytitle>systemd-timedated.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
ff5921ba | 239 | <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
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240 | <citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry> |
241 | </para> | |
242 | </refsect1> | |
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243 | |
244 | </refentry> |