NAME
DateTime::TimeZone::Local::Win32 - Determine the local system's time
zone on Windows
VERSION
version 2.04
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, 2008 Server and newer Windows operating systems
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 <
[email protected]>
* Dave Rolsky <
[email protected]>
COPYRIGHT AND LICENSE
Copyright (C) 2007-2014 Dave Rolsky <
[email protected]> Copyright (C)
2014-2019 by David Pinkowitz <
[email protected]>
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
