NAME¶

DateTime::TimeZone::Local::Unix - Determine the local system's time zone on Unix

VERSION¶

version 2.19

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:

• $ENV{TZ}

  It checks $ENV{TZ} for a valid time zone name.

• /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.

• /etc/timezone

  If this file exists, it is read and its contents are used as a time zone name.

• /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.

• /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.

• /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.

• /etc/localtime content

  If this file is not a symlink, it's parsed by a DateTime::TimeZone::Tzfile to retrieve the time zone offset definition. No time zone name will be defined. This is usefull if the file does not present in the system time zone database.

SUPPORT¶

Bugs may be submitted at <https://github.com/houseabsolute/DateTime-TimeZone/issues>.

I am also usually active on IRC as 'autarch' on "irc://irc.perl.org".

SOURCE¶

The source code repository for DateTime-TimeZone can be found at <https://github.com/houseabsolute/DateTime-TimeZone>.

AUTHOR¶

Dave Rolsky <autarch@urth.org>

COPYRIGHT AND LICENSE¶

This software is copyright (c) 2018 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.