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.\" ========================================================================
.\"
.IX Title "DateTime::TimeZone::Local::Unix 3"
.TH DateTime::TimeZone::Local::Unix 3 "2016-07-18" "perl v5.16.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
DateTime::TimeZone::Local::Unix \- Determine the local system's time zone on Unix
.SH "VERSION"
.IX Header "VERSION"
version 2.01
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  my $tz = DateTime::TimeZone\->new( name => \*(Aqlocal\*(Aq );
\&
\&  my $tz = DateTime::TimeZone::Local\->TimeZone();
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides methods for determining the local time zone on a
Unix platform.
.SH "HOW THE TIME ZONE IS DETERMINED"
.IX Header "HOW THE TIME ZONE IS DETERMINED"
This class tries the following methods of determining the local time
zone:
.IP "\(bu" 4
\&\f(CW$ENV\fR{\s-1TZ\s0}
.Sp
It checks \f(CW$ENV{TZ}\fR for a valid time zone name.
.IP "\(bu" 4
\&\fI/etc/localtime\fR
.Sp
If this file is a symlink to an Olson database time zone file (usually
in \fI/usr/share/zoneinfo\fR) then it uses the target file's path name to
determine the time zone name. For example, if the path is
\&\fI/usr/share/zoneinfo/America/Chicago\fR, the time zone is
\&\*(L"America/Chicago\*(R".
.Sp
Some systems just copy the relevant file to \fI/etc/localtime\fR instead
of making a symlink.  In this case, we look in \fI/usr/share/zoneinfo\fR
for a file that has the same size and content as \fI/etc/localtime\fR to
determine the local time zone.
.IP "\(bu" 4
\&\fI/etc/timezone\fR
.Sp
If this file exists, it is read and its contents are used as a time
zone name.
.IP "\(bu" 4
\&\fI/etc/TIMEZONE\fR
.Sp
If this file exists, it is opened and we look for a line starting like
\&\*(L"\s-1TZ\s0 = ...\*(R". If this is found, it should indicate a time zone name.
.IP "\(bu" 4
\&\fI/etc/sysconfig/clock\fR
.Sp
If this file exists, it is opened and we look for a line starting like
\&\*(L"\s-1TIMEZONE\s0 = ...\*(R" or \*(L"\s-1ZONE\s0 = ...\*(R". If this is found, it should indicate
a time zone name.
.IP "\(bu" 4
\&\fI/etc/default/init\fR
.Sp
If this file exists, it is opened and we look for a line starting like
\&\*(L"TZ=...\*(R". If this is found, it should indicate a time zone name.
.SH "SUPPORT"
.IX Header "SUPPORT"
Bugs may be submitted through the \s-1RT\s0 bug tracker <http://rt.cpan.org/Public/Dist/Display.html?Name=DateTime-TimeZone>
(or bug\-datetime\-timezone@rt.cpan.org <mailto:bug-datetime-timezone@rt.cpan.org>).
.PP
I am also usually active on \s-1IRC\s0 as 'drolsky' on \f(CW\*(C`irc://irc.perl.org\*(C'\fR.
.SH "AUTHOR"
.IX Header "AUTHOR"
Dave Rolsky <autarch@urth.org>
.SH "COPYRIGHT AND LICENCE"
.IX Header "COPYRIGHT AND LICENCE"
This software is copyright (c) 2016 by Dave Rolsky.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.