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DateTime::TimeZone::Local::Win32(3)  User Contributed Perl Documentation DateTime::TimeZone::Local::Win32(3)



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

VERSION
       version 1.51

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.

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 Olson 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 Olson 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 Olson 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/"

AUTHOR
       Dave Rolsky <autarch@urth.org>

COPYRIGHT AND LICENSE
       This software is copyright (c) 2012 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 v5.16.2                                     2012-10-17              DateTime::TimeZone::Local::Win32(3)