12-17-2010
A mystery to me too. It seems to work reasonably, though of course there's some hitches.
The most annoying may be the system clock. Windows sets it to the local time zone, while most Linux distributions set it to UTC. With the result that when you boot Linux it may complain about files having mtimes in the future, etc, etc.
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LEARN ABOUT CENTOS
datetime::timezone::local::win32
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 1.63
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:
o $ENV{TZ}
It checks $ENV{TZ} for a valid time zone name.
o 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.
o 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.
o 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.
o 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) 2013 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 v5.16.3 2013-10-28 DateTime::TimeZone::Local::Win32(3)