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.\" ========================================================================
.\"
.IX Title "DateTime::TimeZone::Local 3pm"
.TH DateTime::TimeZone::Local 3pm "2014-09-30" "perl v5.20.2" "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 \- Determine the local system's time zone
.SH "VERSION"
.IX Header "VERSION"
version 1.75
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  my $tz = DateTime::TimeZone\->new( name => \*(Aqlocal\*(Aq );
\&
\&  my $tz = DateTime::TimeZone::Local\->TimeZone();
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides an interface for determining the local system's
time zone. Most of the functionality for doing this is in OS-specific
subclasses.
.SH "USAGE"
.IX Header "USAGE"
This class provides the following methods:
.SS "DateTime::TimeZone::Local\->\fITimeZone()\fP"
.IX Subsection "DateTime::TimeZone::Local->TimeZone()"
This attempts to load an appropriate subclass and asks it to find the
local time zone. This method is called by when you pass \*(L"local\*(R" as the
time zone name to \f(CW\*(C`DateTime:TimeZone\->new()\*(C'\fR.
.PP
If your \s-1OS\s0 is not explicitly handled, you can create a module with a
name of the form \f(CW\*(C`DateTime::TimeZone::Local::$^O\*(C'\fR. If it exists, it
will be used instead of falling back to the Unix subclass.
.PP
If no OS-specific module exists, we fall back to using the Unix
subclass.
.PP
See DateTime::TimeZone::Local::Unix,
DateTime::TimeZone::Local::Win32, and
DateTime::TimeZone::Local::VMS for OS-specific details.
.SH "SUBCLASSING"
.IX Header "SUBCLASSING"
If you want to make a new OS-specific subclass, there are several
methods provided by this module you should know about.
.ie n .SS "$class\->\fIMethods()\fP"
.el .SS "\f(CW$class\fP\->\fIMethods()\fP"
.IX Subsection "$class->Methods()"
This method should be provided by your class. It should provide a list
of methods that will be called to try to determine the local time
zone.
.PP
Each of these methods is expected to return a new
\&\f(CW\*(C`DateTime::TimeZone\*(C'\fR object if it determines the time zone.
.ie n .SS "$class\->\fIFromEnv()\fP"
.el .SS "\f(CW$class\fP\->\fIFromEnv()\fP"
.IX Subsection "$class->FromEnv()"
This method tries to find a valid time zone in an \f(CW%ENV\fR value. It
calls \f(CW\*(C`$class\->EnvVars()\*(C'\fR to determine which keys to look at.
.PP
To use this from a subclass, simply return \*(L"FromEnv\*(R" as one of the
items from \f(CW\*(C`$class\->Methods()\*(C'\fR.
.ie n .SS "$class\->\fIEnvVars()\fP"
.el .SS "\f(CW$class\fP\->\fIEnvVars()\fP"
.IX Subsection "$class->EnvVars()"
This method should be provided by your subclass. It should return a
list of env vars to be checked by \f(CW\*(C`$class\->FromEnv()\*(C'\fR.
.ie n .SS "$class\->_IsValidName($name)"
.el .SS "\f(CW$class\fP\->_IsValidName($name)"
.IX Subsection "$class->_IsValidName($name)"
Given a possible time zone name, this returns a boolean indicating
whether or not the name looks valid. It always return false for
\&\*(L"local\*(R" in order to avoid infinite loops.
.SH "EXAMPLE SUBCLASS"
.IX Header "EXAMPLE SUBCLASS"
Here is a simple example subclass:
.PP
.Vb 1
\&  package DateTime::TimeZone::SomeOS;
\&
\&  use strict;
\&  use warnings;
\&
\&  use base \*(AqDateTime::TimeZone::Local\*(Aq;
\&
\&
\&  sub Methods { qw( FromEnv FromEther ) }
\&
\&  sub EnvVars { qw( TZ ZONE ) }
\&
\&  sub FromEther
\&  {
\&      my $class = shift;
\&
\&      ...
\&  }
.Ve
.SH "AUTHOR"
.IX Header "AUTHOR"
Dave Rolsky <autarch@urth.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2014 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.