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DateTime::TimeZone::Local::UnixUser)Contributed Perl DocumentDateTime::TimeZone::Local::Unix(3pm)
NAME
DateTime::TimeZone::Local::Unix - Determine the local system's time zone on Unix
VERSION
version 2.51
SYNOPSIS
my $tz = DateTime::TimeZone->new( name => 'local' );
my $tz = DateTime::TimeZone::Local->TimeZone();
DESCRIPTION
This module provides methods for determining the local time zone on a Unix platform.
HOW THE TIME ZONE IS DETERMINED
This class tries the following methods of determining the local time zone:
o $ENV{TZ}
It checks $ENV{TZ} for a valid time zone name.
o /etc/localtime
If this file is a symlink to an Olson database time zone file (usually in
/usr/share/zoneinfo) then it uses the target file's path name to determine the time
zone name. For example, if the path is /usr/share/zoneinfo/America/Chicago, the time
zone is "America/Chicago".
Some systems just copy the relevant file to /etc/localtime instead of making a
symlink. In this case, we look in /usr/share/zoneinfo for a file that has the same
size and content as /etc/localtime to determine the local time zone.
o /etc/timezone
If this file exists, it is read and its contents are used as a time zone name.
o /etc/TIMEZONE
If this file exists, it is opened and we look for a line starting like "TZ = ...". If
this is found, it should indicate a time zone name.
o /etc/sysconfig/clock
If this file exists, it is opened and we look for a line starting like "TIMEZONE =
..." or "ZONE = ...". If this is found, it should indicate a time zone name.
o /etc/default/init
If this file exists, it is opened and we look for a line starting like "TZ=...". If
this is found, it should indicate a time zone name.
Note: Some systems such as virtual machine boxes may lack any of these files. You can
confirm that this is case by running:
$ ls -l /etc/localtime /etc/timezone /etc/TIMEZONE \
/etc/sysconfig/clock /etc/default/init
If this is the case, then when checking for timezone handling you are likely to get an
exception:
$ perl -wle 'use DateTime; DateTime->now( time_zone => "local" )'
Cannot determine local time zone
In that case, you should consult your system man pages for details on how to address that
problem. In one such case reported to us, a FreeBSD virtual machine had been built without
any of these files. The user was able to run the FreeBSD tzsetup utility. That installed
/etc/localtime, after which the above timezone diagnostic ran silently, i.e., without
throwing an exception.
SUPPORT
Bugs may be submitted at <https://github.com/houseabsolute/DateTime-TimeZone/issues>.
SOURCE
The source code repository for DateTime-TimeZone can be found at
<https://github.com/houseabsolute/DateTime-TimeZone>.
AUTHOR
Dave Rolsky <autarch AT urth.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2021 by Dave Rolsky.
This is free software; you can redistribute it and/or modify it under the same terms as
the Perl 5 programming language system itself.
The full text of the license can be found in the LICENSE file included with this
distribution.
perl v5.32.1 2021-10-22 DateTime::TimeZone::Local::Unix(3pm)
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