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CentOS 7.0 - man page for datetime::timezone::local (centos section 3)

DateTime::TimeZone::Local(3)   User Contributed Perl Documentation   DateTime::TimeZone::Local(3)

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

VERSION
       version 1.63

SYNOPSIS
	 my $tz = DateTime::TimeZone->new( name => 'local' );

	 my $tz = DateTime::TimeZone::Local->TimeZone();

DESCRIPTION
       This module provides an interface for determining the local system's time zone. Most of
       the functionality for doing this is in OS-specific subclasses.

USAGE
       This class provides the following methods:

   DateTime::TimeZone::Local->TimeZone()
       This attempts to load an appropriate subclass and asks it to find the local time zone.
       This method is called by when you pass "local" as the time zone name to
       "DateTime:TimeZone->new()".

       If your OS is not explicitly handled, you can create a module with a name of the form
       "DateTime::TimeZone::Local::$^O". If it exists, it will be used instead of falling back to
       the Unix subclass.

       If no OS-specific module exists, we fall back to using the Unix subclass.

       See DateTime::TimeZone::Local::Unix, DateTime::TimeZone::Local::Win32, and
       DateTime::TimeZone::Local::VMS for OS-specific details.

SUBCLASSING
       If you want to make a new OS-specific subclass, there are several methods provided by this
       module you should know about.

   $class->Methods()
       This method should be provided by your class. It should provide a list of methods that
       will be called to try to determine the local time zone.

       Each of these methods is expected to return a new "DateTime::TimeZone" object if it
       determines the time zone.

   $class->FromEnv()
       This method tries to find a valid time zone in an %ENV value. It calls "$class->EnvVars()"
       to determine which keys to look at.

       To use this from a subclass, simply return "FromEnv" as one of the items from
       "$class->Methods()".

   $class->EnvVars()
       This method should be provided by your subclass. It should return a list of env vars to be
       checked by "$class->FromEnv()".

   $class->_IsValidName($name)
       Given a possible time zone name, this returns a boolean indicating whether or not the name
       looks valid. It always return false for "local" in order to avoid infinite loops.

EXAMPLE SUBCLASS
       Here is a simple example subclass:

	 package DateTime::TimeZone::SomeOS;

	 use strict;
	 use warnings;

	 use base 'DateTime::TimeZone::Local';

	 sub Methods { qw( FromEnv FromEther ) }

	 sub EnvVars { qw( TZ ZONE ) }

	 sub FromEther
	 {
	     my $class = shift;

	     ...
	 }

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 v5.16.3				    2013-10-28		     DateTime::TimeZone::Local(3)


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