package DateTime::TimeZone::Local::Win32;
use strict;
use warnings;
use base 'DateTime::TimeZone::Local';
my %Registry;
use Win32::TieRegistry ( TiedHash => \%Registry );
sub Methods { return qw( FromEnv FromRegistry ) }
sub EnvVars { return 'TZ' }
{
# This list was found as part of the zipball from downloading the
# Chronos project - a Smalltalk datetime library. Thanks, Chronos!
my %WinToOlson =
( 'Afghanistan' => 'Asia/Kabul',
'Afghanistan Standard Time' => 'Asia/Kabul',
'Alaskan' => 'America/Anchorage',
'Alaskan Standard Time' => 'America/Anchorage',
'Arab' => 'Asia/Riyadh',
'Arab Standard Time' => 'Asia/Riyadh',
'Arabian' => 'Asia/Muscat',
'Arabian Standard Time' => 'Asia/Muscat',
'Arabic Standard Time' => 'Asia/Baghdad',
'Atlantic' => 'America/Halifax',
'Atlantic Standard Time' => 'America/Halifax',
'AUS Central' => 'Australia/Darwin',
'AUS Central Standard Time' => 'Australia/Darwin',
'AUS Eastern' => 'Australia/Sydney',
'AUS Eastern Standard Time' => 'Australia/Sydney',
'Azores' => 'Atlantic/Azores',
'Azores Standard Time' => 'Atlantic/Azores',
'Bangkok' => 'Asia/Bangkok',
'Bangkok Standard Time' => 'Asia/Bangkok',
'Beijing' => 'Asia/Shanghai',
'Canada Central' => 'America/Regina',
'Canada Central Standard Time' => 'America/Regina',
'Cape Verde Standard Time' => 'Atlantic/Cape_Verde',
'Caucasus' => 'Asia/Tbilisi',
'Caucasus Standard Time' => 'Asia/Tbilisi',
'Cen. Australia' => 'Australia/Adelaide',
'Cen. Australia Standard Time' => 'Australia/Adelaide',
'Central' => 'America/Chicago',
'Central America Standard Time' => 'America/Regina',
'Central Asia' => 'Asia/Dhaka',
'Central Asia Standard Time' => 'Asia/Dhaka',
'Central Europe' => 'Europe/Prague',
'Central Europe Standard Time' => 'Europe/Prague',
'Central European' => 'Europe/Belgrade',
'Central European Standard Time' => 'Europe/Belgrade',
'Central Pacific' => 'Pacific/Guadalcanal',
'Central Pacific Standard Time' => 'Pacific/Guadalcanal',
'Central Standard Time' => 'America/Chicago',
'China' => 'Asia/Shanghai',
'China Standard Time' => 'Asia/Shanghai',
'Dateline' => 'Pacific/Majuro',
'Dateline Standard Time' => 'Pacific/Majuro',
'E. Africa' => 'Africa/Nairobi',
'E. Africa Standard Time' => 'Africa/Nairobi',
'E. Australia' => 'Australia/Brisbane',
'E. Australia Standard Time' => 'Australia/Brisbane',
'E. Europe' => 'Europe/Bucharest',
'E. Europe Standard Time' => 'Europe/Bucharest',
'E. South America' => 'America/Sao_Paulo',
'E. South America Standard Time' => 'America/Sao_Paulo',
'Eastern' => 'America/New_York',
'Eastern Standard Time' => 'America/New_York',
'Egypt' => 'Africa/Cairo',
'Egypt Standard Time' => 'Africa/Cairo',
'Ekaterinburg' => 'Asia/Yekaterinburg',
'Ekaterinburg Standard Time' => 'Asia/Yekaterinburg',
'Fiji' => 'Pacific/Fiji',
'Fiji Standard Time' => 'Pacific/Fiji',
'FLE' => 'Europe/Helsinki',
'FLE Standard Time' => 'Europe/Helsinki',
'GFT' => 'Europe/Athens',
'GFT Standard Time' => 'Europe/Athens',
'GMT' => 'Europe/London',
'GMT Standard Time' => 'Europe/London',
'GMT Standard Time' => 'GMT',
'Greenland Standard Time' => 'America/Godthab',
'Greenwich' => 'GMT',
'Greenwich Standard Time' => 'GMT',
'GTB' => 'Europe/Athens',
'GTB Standard Time' => 'Europe/Athens',
'Hawaiian' => 'Pacific/Honolulu',
'Hawaiian Standard Time' => 'Pacific/Honolulu',
'India' => 'Asia/Calcutta',
'India Standard Time' => 'Asia/Calcutta',
'Iran' => 'Asia/Tehran',
'Iran Standard Time' => 'Asia/Tehran',
'Israel' => 'Asia/Jerusalem',
'Israel Standard Time' => 'Asia/Jerusalem',
'Korea' => 'Asia/Seoul',
'Korea Standard Time' => 'Asia/Seoul',
'Mexico' => 'America/Mexico_City',
'Mexico Standard Time' => 'America/Mexico_City',
'Mexico Standard Time 2' => 'America/Chihuahua',
'Mid-Atlantic' => 'Atlantic/South_Georgia',
'Mid-Atlantic Standard Time' => 'Atlantic/South_Georgia',
'Mountain' => 'America/Denver',
'Mountain Standard Time' => 'America/Denver',
'Myanmar Standard Time' => 'Asia/Rangoon',
'N. Central Asia Standard Time' => 'Asia/Novosibirsk',
'Nepal Standard Time' => 'Asia/Katmandu',
'New Zealand' => 'Pacific/Auckland',
'New Zealand Standard Time' => 'Pacific/Auckland',
'Newfoundland' => 'America/St_Johns',
'Newfoundland Standard Time' => 'America/St_Johns',
'North Asia East Standard Time' => 'Asia/Ulaanbaatar',
'North Asia Standard Time' => 'Asia/Krasnoyarsk',
'Pacific' => 'America/Los_Angeles',
'Pacific SA' => 'America/Santiago',
'Pacific SA Standard Time' => 'America/Santiago',
'Pacific Standard Time' => 'America/Los_Angeles',
'Prague Bratislava' => 'Europe/Prague',
'Romance' => 'Europe/Paris',
'Romance Standard Time' => 'Europe/Paris',
'Russian' => 'Europe/Moscow',
'Russian Standard Time' => 'Europe/Moscow',
'SA Eastern' => 'America/Buenos_Aires',
'SA Eastern Standard Time' => 'America/Buenos_Aires',
'SA Pacific' => 'America/Bogota',
'SA Pacific Standard Time' => 'America/Bogota',
'SA Western' => 'America/Caracas',
'SA Western Standard Time' => 'America/Caracas',
'Samoa' => 'Pacific/Apia',
'Samoa Standard Time' => 'Pacific/Apia',
'Saudi Arabia' => 'Asia/Riyadh',
'Saudi Arabia Standard Time' => 'Asia/Riyadh',
'SE Asia' => 'Asia/Bangkok',
'SE Asia Standard Time' => 'Asia/Bangkok',
'Singapore' => 'Asia/Singapore',
'Singapore Standard Time' => 'Asia/Singapore',
'South Africa' => 'Africa/Harare',
'South Africa Standard Time' => 'Africa/Harare',
'Sri Lanka' => 'Asia/Colombo',
'Sri Lanka Standard Time' => 'Asia/Colombo',
'Sydney Standard Time' => 'Australia/Sydney',
'Taipei' => 'Asia/Taipei',
'Taipei Standard Time' => 'Asia/Taipei',
'Tasmania' => 'Australia/Hobart',
'Tasmania Standard Time' => 'Australia/Hobart',
'Tokyo' => 'Asia/Tokyo',
'Tokyo Standard Time' => 'Asia/Tokyo',
'Tonga Standard Time' => 'Pacific/Tongatapu',
'US Eastern' => 'America/Indianapolis',
'US Eastern Standard Time' => 'America/Indianapolis',
'US Mountain' => 'America/Phoenix',
'US Mountain Standard Time' => 'America/Phoenix',
'Vladivostok' => 'Asia/Vladivostok',
'Vladivostok Standard Time' => 'Asia/Vladivostok',
'W. Australia' => 'Australia/Perth',
'W. Australia Standard Time' => 'Australia/Perth',
'W. Central Africa Standard Time' => 'Africa/Luanda',
'W. Europe' => 'Europe/Berlin',
'W. Europe Standard Time' => 'Europe/Berlin',
'Warsaw' => 'Europe/Warsaw',
'West Asia' => 'Asia/Karachi',
'West Asia Standard Time' => 'Asia/Karachi',
'West Pacific' => 'Pacific/Guam',
'West Pacific Standard Time' => 'Pacific/Guam',
'Yakutsk' => 'Asia/Yakutsk',
'Yakutsk Standard Time' => 'Asia/Yakutsk',
);
my $Key =
'HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation\\StandardName';
sub FromRegistry
{
my $class = shift;
my $win_name = $Registry{$Key};
return unless $win_name;
my $olson = $WinToOlson{$win_name};
return unless $olson;
return unless $class->_IsValidName($olson);
return eval { DateTime::TimeZone->new( name => $olson ) };
}
}
1;
__END__
=head1 NAME
DateTime::TimeZone::Local::Win32 - Determine the local system's time zone on Windows
=head1 SYNOPSIS
my $tz = DateTime::TimeZone->new( name => 'local' );
my $tz = DateTime::TimeZone::Local->TimeZone();
=head1 DESCRIPTION
This module provides methods for determining the local time zone on a
Windows platform.
=head1 HOW THE TIME ZONE IS DETERMINED
This class tries the following methods of determining the local time
zone:
=over 4
=item * $ENV{TZ}
It checks C<< $ENV{TZ} >> for a valid time zone name.
=item * Windows Registry
We check for a registry key called
"HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation\StandardName".
If this exists, it contains a Windows name for the time zone. We use a
lookup table to translate this into an equivalent time zone name.
This lookup table was borrowed from the Chronos Smalltalk
library.
=back
=head1 AUTHOR
Dave Rolsky, <autarch@urth.org>
=head1 COPYRIGHT & LICENSE
Copyright (c) 2003-2007 David Rolsky. All rights reserved. This
program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
The full text of the license can be found in the LICENSE file included
with this module.
=cut
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