DateTime::TimeZone::LoUser:Contributed PerlDateTime::TimeZone::Local::Win32(3)NAMEDateTime::TimeZone::Local::Win32 - Determine the local system's time
zone on Windows
VERSION
version 1.69
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) 2014 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 v5.18.22014-05-1DateTime::TimeZone::Local::Win32(3)