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This explicitly documents the default `UTC` timezone which is used by systemd and (other softwares) when `/etc/localtime` is not present. Ref: https://github.com/systemd/systemd/blob/v247/src/basic/time-util.c#L1460-L1469
73 lines
3.1 KiB
XML
73 lines
3.1 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="localtime">
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<refentryinfo>
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<title>localtime</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>localtime</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>localtime</refname>
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<refpurpose>Local timezone configuration file</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/etc/localtime</filename> -> <filename>../usr/share/zoneinfo/…</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>The <filename>/etc/localtime</filename> file configures the
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system-wide timezone of the local system that is used by
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applications for presentation to the user. It should be an
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absolute or relative symbolic link pointing to
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<filename>/usr/share/zoneinfo/</filename>, followed by a timezone
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identifier such as <literal>Europe/Berlin</literal> or
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<literal>Etc/UTC</literal>. The resulting link should lead to the
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corresponding binary
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<citerefentry project='man-pages'><refentrytitle>tzfile</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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timezone data for the configured timezone.</para>
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<para>Because the timezone identifier is extracted from the
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symlink target name of <filename>/etc/localtime</filename>, this
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file may not be a normal file or hardlink.</para>
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<para>If <filename>/etc/localtime</filename> is missing, the
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default <literal>UTC</literal> timezone is used.</para>
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<para>The timezone may be overridden for individual programs by
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using the <varname>$TZ</varname> environment variable. See
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<citerefentry project='man-pages'><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
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<para>You may use
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<citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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to change the settings of this file from the command line during
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runtime. Use
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<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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to initialize the time zone on mounted (but not booted) system
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images.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>tzset</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>localtime</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>timedatectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-timedated.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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