1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>timedatectl</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><style>
a.headerlink {
color: #c60f0f;
font-size: 0.8em;
padding: 0 4px 0 4px;
text-decoration: none;
visibility: hidden;
}
a.headerlink:hover {
background-color: #c60f0f;
color: white;
}
h1:hover > a.headerlink, h2:hover > a.headerlink, h3:hover > a.headerlink, dt:hover > a.headerlink {
visibility: visible;
}
</style><a href="index.html">Index </a>·
<a href="systemd.directives.html">Directives </a>·
<a href="../python-systemd/index.html">Python </a>·
<a href="../libudev/index.html">libudev </a>·
<a href="../libudev/index.html">gudev </a><span style="float:right">systemd 215</span><hr><div class="refentry"><a name="timedatectl"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>timedatectl — Control the system time and date</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="command">timedatectl [OPTIONS...] {COMMAND}</code> </p></div></div><div class="refsect1"><a name="idm214188218784"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><span class="command"><strong>timedatectl</strong></span> may be used to
query and change the system clock and its
settings.</p></div><div class="refsect1"><a name="idm214188216928"></a><h2 id="Options">Options<a class="headerlink" title="Permalink to this headline" href="#Options">¶</a></h2><p>The following options are understood:</p><div class="variablelist"><dl class="variablelist"><dt id="--no-ask-password"><span class="term"><code class="option">--no-ask-password</code></span><a class="headerlink" title="Permalink to this term" href="#--no-ask-password">¶</a></dt><dd><p>Do not query the user
for authentication for privileged
operations.</p></dd><dt id="--adjust-system-clock"><span class="term"><code class="option">--adjust-system-clock</code></span><a class="headerlink" title="Permalink to this term" href="#--adjust-system-clock">¶</a></dt><dd><p>If
<span class="command"><strong>set-local-rtc</strong></span> is
invoked and this option is passed, the
system clock is synchronized from the
RTC again, taking the new setting into
account. Otherwise, the RTC is
synchronized from the system
clock.</p></dd><dt id="-H"><span class="term"><code class="option">-H</code>, </span><span class="term"><code class="option">--host=</code></span><a class="headerlink" title="Permalink to this term" href="#-H">¶</a></dt><dd><p><a name="host-text"></a>Execute the operation remotely. Specify a hostname, or a
username and hostname separated by "<code class="literal">@</code>", to
connect to. The hostname may optionally be suffixed by a
container name, separated by "<code class="literal">:</code>", which
connects directly to a specific container on the specified
host. This will use SSH to talk to the remote machine manager
instance. Container names may be enumerated with
<span class="command"><strong>machinectl -H
<em class="replaceable"><code>HOST</code></em></strong></span>.</p></dd><dt id="-M"><span class="term"><code class="option">-M</code>, </span><span class="term"><code class="option">--machine=</code></span><a class="headerlink" title="Permalink to this term" href="#-M">¶</a></dt><dd><p><a name="machine-text"></a>Execute operation on a local container. Specify a
container name to connect to.</p></dd><dt id="-h"><span class="term"><code class="option">-h</code>, </span><span class="term"><code class="option">--help</code></span><a class="headerlink" title="Permalink to this term" href="#-h">¶</a></dt><dd><p><a name="help-text"></a>Print a short help text and exit.
</p></dd><dt id="--version"><span class="term"><code class="option">--version</code></span><a class="headerlink" title="Permalink to this term" href="#--version">¶</a></dt><dd><p><a name="version-text"></a>Print a short version string and exit.</p></dd><dt id="--no-pager"><span class="term"><code class="option">--no-pager</code></span><a class="headerlink" title="Permalink to this term" href="#--no-pager">¶</a></dt><dd><p>Do not pipe output into a pager.</p></dd></dl></div><p>The following commands are understood:</p><div class="variablelist"><dl class="variablelist"><dt id="status"><span class="term"><span class="command"><strong>status</strong></span></span><a class="headerlink" title="Permalink to this term" href="#status">¶</a></dt><dd><p>Show current settings
of the system clock and
RTC.</p></dd><dt id="set-time [TIME]"><span class="term"><span class="command"><strong>set-time [TIME]</strong></span></span><a class="headerlink" title="Permalink to this term" href="#set-time%20%5BTIME%5D">¶</a></dt><dd><p>Set the system clock
to the specified time. This will also
update the RTC time accordingly. The time
may be specified in the format
"2012-10-30
18:17:16".</p></dd><dt id="set-timezone [TIMEZONE]"><span class="term"><span class="command"><strong>set-timezone [TIMEZONE]</strong></span></span><a class="headerlink" title="Permalink to this term" href="#set-timezone%20%5BTIMEZONE%5D">¶</a></dt><dd><p>Set the system time
zone to the specified value. Available
timezones can be listed with
<span class="command"><strong>list-timezones</strong></span>. If
the RTC is configured to be in the
local time, this will also update the
RTC time. This call will alter the
<code class="filename">/etc/localtime</code>
symlink. See
<a href="localtime.html"><span class="citerefentry"><span class="refentrytitle">localtime</span>(5)</span></a>
for more
information.</p></dd><dt id="list-timezones"><span class="term"><span class="command"><strong>list-timezones</strong></span></span><a class="headerlink" title="Permalink to this term" href="#list-timezones">¶</a></dt><dd><p>List available time
zones, one per line. Entries from the
list can be set as the system
timezone with
<span class="command"><strong>set-timezone</strong></span>.</p></dd><dt id="set-local-rtc [BOOL]"><span class="term"><span class="command"><strong>set-local-rtc [BOOL]</strong></span></span><a class="headerlink" title="Permalink to this term" href="#set-local-rtc%20%5BBOOL%5D">¶</a></dt><dd><p>Takes a boolean
argument. If "<code class="literal">0</code>", the
system is configured to maintain the
RTC in universal time. If
"<code class="literal">1</code>", it will maintain
the RTC in local time instead. Note
that maintaining the RTC in the local
timezone is not fully supported and
will create various problems with time
zone changes and daylight saving
adjustments. If at all possible, keep the
RTC in UTC mode. Note that invoking this
will also synchronize the RTC from the
system clock, unless
<code class="option">--adjust-system-clock</code> is
passed (see above). This command will
change the 3rd line of
<code class="filename">/etc/adjtime</code>, as
documented in
<a href="hwclock.html"><span class="citerefentry"><span class="refentrytitle">hwclock</span>(8)</span></a>.</p></dd><dt id="set-ntp [BOOL]"><span class="term"><span class="command"><strong>set-ntp [BOOL]</strong></span></span><a class="headerlink" title="Permalink to this term" href="#set-ntp%20%5BBOOL%5D">¶</a></dt><dd><p>Takes a boolean
argument. Controls whether NTP based
network time synchronization is
enabled (if
available).</p></dd></dl></div></div><div class="refsect1"><a name="idm214192134048"></a><h2 id="Exit status">Exit status<a class="headerlink" title="Permalink to this headline" href="#Exit%20status">¶</a></h2><p>On success, 0 is returned, a non-zero failure
code otherwise.</p></div><div class="refsect1"><a name="idm214173847264"></a><h2 id="Environment">Environment<a class="headerlink" title="Permalink to this headline" href="#Environment">¶</a></h2><div class="variablelist"><dl class="variablelist"><dt id="$SYSTEMD_PAGER"><span class="term"><code class="varname">$SYSTEMD_PAGER</code></span><a class="headerlink" title="Permalink to this term" href="#%24SYSTEMD_PAGER">¶</a></dt><dd><p>Pager to use when
<code class="option">--no-pager</code> is not given;
overrides <code class="varname">$PAGER</code>. Setting
this to an empty string or the value
"<code class="literal">cat</code>" is equivalent to passing
<code class="option">--no-pager</code>.</p></dd><dt id="$SYSTEMD_LESS"><span class="term"><code class="varname">$SYSTEMD_LESS</code></span><a class="headerlink" title="Permalink to this term" href="#%24SYSTEMD_LESS">¶</a></dt><dd><p>Override the default
options passed to
<span class="command"><strong>less</strong></span>
("<code class="literal">FRSXMK</code>").</p></dd></dl></div></div><div class="refsect1"><a name="idm214192132352"></a><h2 id="Examples">Examples<a class="headerlink" title="Permalink to this headline" href="#Examples">¶</a></h2><p>Show current settings:
</p><pre class="programlisting">$ timedatectl
Local time: Fri, 2012-11-02 09:26:46 CET
Universal time: Fri, 2012-11-02 08:26:46 UTC
RTC time: Fri, 2012-11-02 08:26:45
Timezone: Europe/Warsaw
UTC offset: +0100
NTP enabled: no
NTP synchronized: no
RTC in local TZ: no
DST active: no
Last DST change: CEST → CET, DST became inactive
Sun, 2012-10-28 02:59:59 CEST
Sun, 2012-10-28 02:00:00 CET
Next DST change: CET → CEST, DST will become active
the clock will jump one hour forward
Sun, 2013-03-31 01:59:59 CET
Sun, 2013-03-31 03:00:00 CEST</pre><p>
</p><p>Enable an NTP daemon (chronyd):
</p><pre class="programlisting">$ timedatectl set-ntp true
==== AUTHENTICATING FOR org.freedesktop.timedate1.set-ntp ===
Authentication is required to control whether network time synchronization shall be enabled.
Authenticating as: user
Password: ********
==== AUTHENTICATION COMPLETE ===</pre><p>
</p><pre class="programlisting">$ systemctl status chronyd.service
chronyd.service - NTP client/server
Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled)
Active: active (running) since Fri, 2012-11-02 09:36:25 CET; 5s ago
...</pre><p>
</p></div><div class="refsect1"><a name="idm214192127008"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
<a href="hwclock.html"><span class="citerefentry"><span class="refentrytitle">hwclock</span>(8)</span></a>,
<a href="date.html"><span class="citerefentry"><span class="refentrytitle">date</span>(1)</span></a>,
<a href="localtime.html"><span class="citerefentry"><span class="refentrytitle">localtime</span>(5)</span></a>,
<a href="systemctl.html"><span class="citerefentry"><span class="refentrytitle">systemctl</span>(1)</span></a>,
<a href="systemd-timedated.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-timedated.service</span>(8)</span></a>
</p></div></div></body></html>
|
