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.\" ========================================================================
.\"
.IX Title "DateTime::TimeZone::Local::Win32 3"
.TH DateTime::TimeZone::Local::Win32 3 "2013-07-07" "perl v5.10.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.nh
.SH "NAME"
DateTime::TimeZone::Local::Win32 \- Determine the local system's time zone on Windows
.SH "VERSION"
.IX Header "VERSION"
version 1.60
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& my $tz = DateTime::TimeZone\->new( name => \*(Aqlocal\*(Aq );
\&
\& my $tz = DateTime::TimeZone::Local\->TimeZone();
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides methods for determining the local time zone on a
Windows platform.
.SH "HOW THE TIME ZONE IS DETERMINED"
.IX Header "HOW THE TIME ZONE IS DETERMINED"
This class tries the following methods of determining the local time
zone:
.IP "\(bu" 4
\&\f(CW$ENV\fR{\s-1TZ\s0}
.Sp
It checks \f(CW$ENV{TZ}\fR for a valid time zone name.
.IP "\(bu" 4
Windows Registry
.Sp
When using the registry, we look for the Windows time zone and use a
mapping to translate this to an Olson time zone name.
.RS 4
.IP "\(bu" 8
Windows Vista and 2008
.Sp
We look in \*(L"SYSTEM/CurrentControlSet/Control/TimeZoneInformation/\*(R" for
a node named \*(L"/TimeZoneKeyName\*(R". If this exists, we use this key to
look up the Olson time zone name in our mapping.
.IP "\(bu" 8
Windows \s-1NT\s0, Windows 2000, Windows \s-1XP\s0, Windows 2003 Server
.Sp
We look in \*(L"SOFTWARE/Microsoft/Windows NT/CurrentVersion/Time Zones/\*(R"
and loop through all of its sub keys.
.Sp
For each sub key, we compare the value of the key with \*(L"/Std\*(R" appended
to the end to the value of
\&\*(L"SYSTEM/CurrentControlSet/Control/TimeZoneInformation/StandardName\*(R". This
gives us the \fIEnglish\fR name of the Windows time zone, which we use to
look up the Olson time zone name.
.IP "\(bu" 8
Windows 95, Windows 98, Windows Millenium Edition
.Sp
The algorithm is the same as for \s-1NT\s0, but we loop through the sub keys
of \*(L"SOFTWARE/Microsoft/Windows/CurrentVersion/Time Zones/\*(R"
.RE
.RS 4
.RE
.SH "AUTHOR"
.IX Header "AUTHOR"
Dave Rolsky <autarch@urth.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2013 by Dave Rolsky.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
Mini Shell