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124 .\" ========================================================================
126 .IX Title "DateTime::TimeZone::Local 3"
127 .TH DateTime::TimeZone::Local 3 "2009-11-16" "perl v5.8.7" "User Contributed Perl Documentation"
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133 DateTime::TimeZone::Local \- Determine the local system's time zone
135 .IX Header "SYNOPSIS"
137 \& my $tz = DateTime::TimeZone\->new( name => \*(Aqlocal\*(Aq );
139 \& my $tz = DateTime::TimeZone::Local\->TimeZone();
142 .IX Header "DESCRIPTION"
143 This module provides an interface for determining the local system's
144 time zone. Most of the functionality for doing this is in OS-specific
148 This class provides the following methods:
149 .SS "DateTime::TimeZone::Local\->\fITimeZone()\fP"
150 .IX Subsection "DateTime::TimeZone::Local->TimeZone()"
151 This attempts to load an appropriate subclass and asks it to find the
152 local time zone. This method is called by when you pass \*(L"local\*(R" as the
153 time zone name to \f(CW\*(C`DateTime:TimeZone\->new()\*(C'\fR.
155 If your \s-1OS\s0 is not explicitly handled, you can create a module with a
156 name of the form \f(CW\*(C`DateTime::TimeZone::Local::$^O\*(C'\fR. If it exists, it
157 will be used instead of falling back to the Unix subclass.
159 If no OS-specific module exists, we fall back to using the Unix
162 See DateTime::TimeZone::Local::Unix,
163 DateTime::TimeZone::Local::Win32, and
164 DateTime::TimeZone::Local::VMS for OS-specific details.
166 .IX Header "SUBCLASSING"
167 If you want to make a new OS-specific subclass, there are several
168 methods provided by this module you should know about.
169 .ie n .SS "$class\->\fIMethods()\fP"
170 .el .SS "\f(CW$class\fP\->\fIMethods()\fP"
171 .IX Subsection "$class->Methods()"
172 This method should be provided by your class. It should provide a list
173 of methods that will be called to try to determine the local time
176 Each of these methods is expected to return a new
177 \&\f(CW\*(C`DateTime::TimeZone\*(C'\fR object if it determines the time zone.
178 .ie n .SS "$class\->\fIFromEnv()\fP"
179 .el .SS "\f(CW$class\fP\->\fIFromEnv()\fP"
180 .IX Subsection "$class->FromEnv()"
181 This method tries to find a valid time zone in an \f(CW%ENV\fR value. It
182 calls \f(CW\*(C`$class\->EnvVars()\*(C'\fR to determine which keys to look at.
184 To use this from a subclass, simply return \*(L"FromEnv\*(R" as one of the
185 items from \f(CW\*(C`$class\->Methods()\*(C'\fR.
186 .ie n .SS "$class\->\fIEnvVars()\fP"
187 .el .SS "\f(CW$class\fP\->\fIEnvVars()\fP"
188 .IX Subsection "$class->EnvVars()"
189 This method should be provided by your subclass. It should return a
190 list of env vars to be checked by \f(CW\*(C`$class\->FromEnv()\*(C'\fR.
191 .ie n .SS "$class\->_IsValidName($name)"
192 .el .SS "\f(CW$class\fP\->_IsValidName($name)"
193 .IX Subsection "$class->_IsValidName($name)"
194 Given a possible time zone name, this returns a boolean indicating
195 whether or not the the name looks valid. It always return false for
196 \&\*(L"local\*(R" in order to avoid infinite loops.
197 .SH "EXAMPLE SUBCLASS"
198 .IX Header "EXAMPLE SUBCLASS"
199 Here is a simple example subclass:
202 \& package DateTime::TimeZone::SomeOS;
207 \& use base \*(AqDateTime::TimeZone::Local\*(Aq;
210 \& sub Methods { qw( FromEnv FromEther ) }
212 \& sub EnvVars { qw( TZ ZONE ) }
216 \& my $class = shift;
223 Dave Rolsky, <autarch@urth.org>
224 .SH "COPYRIGHT & LICENSE"
225 .IX Header "COPYRIGHT & LICENSE"
226 Copyright (c) 2003\-2008 David Rolsky. All rights reserved. This
227 program is free software; you can redistribute it and/or modify it
228 under the same terms as Perl itself.
230 The full text of the license can be found in the \s-1LICENSE\s0 file included