10-22-2014
Not always -- it can be globally set with a file, too, /etc/localtime, which you copy from a selection in /usr/share/localtime. I copied /usr/share/zoneinfo/Canada/Saskatchewan for instance. This gives my system a timezone without having a value set for TZ.
TZ is often used to override the global setting to operate in multiple regions... and sometimes for crude date math (subtracting a number of hours), etc.
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LEARN ABOUT MOJAVE
datetime::timezone::local::unix
DateTime::TimeZone::Local::Unix(3) User Contributed Perl Documentation DateTime::TimeZone::Local::Unix(3)
NAME
DateTime::TimeZone::Local::Unix - Determine the local system's time zone on Unix
VERSION
version 1.63
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.
AUTHOR
Dave Rolsky <autarch@urth.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2013 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.
perl v5.18.2 2013-10-28 DateTime::TimeZone::Local::Unix(3)