• NAME
• VERSION
• SYNOPSIS
• DESCRIPTION
• NAME
• HOW THE TIME ZONE IS DETERMINED
• AUTHORS
• COPYRIGHT AND LICENSE

NAME

DateTime::TimeZone::Local::Win32 - Determine the local system's time zone on Windows

VERSION

version 1.86

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 Windows platform.

NAME

DateTime::TimeZone::Local::Win32 - Determine the local system's time zone on Windows

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.
• Windows Registry
  
When using the registry, we look for the Windows time zone and use a mapping to translate this to an IANA time zone name.
• Windows Vista and 2008
  
We look in ``SYSTEM/CurrentControlSet/Control/TimeZoneInformation/'' for a node named ``/TimeZoneKeyName''. If this exists, we use this key to look up the IANA time zone name in our mapping.
• Windows NT, Windows 2000, Windows XP, Windows 2003 Server
  
We look in ``SOFTWARE/Microsoft/Windows NT/CurrentVersion/Time Zones/'' and loop through all of its sub keys.

For each sub key, we compare the value of the key with ``/Std'' appended to the end to the value of ``SYSTEM/CurrentControlSet/Control/TimeZoneInformation/StandardName''. This gives us the English name of the Windows time zone, which we use to look up the IANA time zone name.

• Windows 95, Windows 98, Windows Millenium Edition
  
The algorithm is the same as for NT, but we loop through the sub keys of ``SOFTWARE/Microsoft/Windows/CurrentVersion/Time Zones/''

AUTHORS

David Pinkowitz <dapink@cpan.org>
Dave Rolsky <autarch@urth.org>

COPYRIGHT AND LICENSE

Copyright (C) 2007-2014 Dave Rolsky <autarch@urth.org> Copyright (C) 2014-2015 by David Pinkowitz <dapink@cpan.org>

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.