table of contents
| 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 1.70
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.
| 2014-06-01 | perl v5.16.3 |