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diff --git a/Bugzilla/User/Setting/Timezone.pm b/Bugzilla/User/Setting/Timezone.pm
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+# -*- Mode: perl; indent-tabs-mode: nil -*-
+#
+# The contents of this file are subject to the Mozilla Public
+# License Version 1.1 (the "License"); you may not use this file
+# except in compliance with the License. You may obtain a copy of
+# the License at http://www.mozilla.org/MPL/
+#
+# Software distributed under the License is distributed on an "AS
+# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+# implied. See the License for the specific language governing
+# rights and limitations under the License.
+#
+# The Original Code is the Bugzilla Bug Tracking System.
+#
+# The Initial Developer of the Original Code is Frédéric Buclin.
+# Portions created by Frédéric Buclin are Copyright (c) 2008 Frédéric Buclin.
+# All rights reserved.
+#
+# Contributor(s): Frédéric Buclin <LpSolit@gmail.com>
+
+package Bugzilla::User::Setting::Timezone;
+
+use strict;
+
+use DateTime::TimeZone;
+
+use base qw(Bugzilla::User::Setting);
+
+use Bugzilla::Constants;
+
+sub legal_values {
+    my ($self) = @_;
+
+    return $self->{'legal_values'} if defined $self->{'legal_values'};
+
+    my @timezones = DateTime::TimeZone->all_names;
+    # Remove old formats, such as CST6CDT, EST, EST5EDT.
+    @timezones = grep { $_ =~ m#.+/.+#} @timezones;
+    # Append 'local' to the list, which will use the timezone
+    # given by the server.
+    push(@timezones, 'local');
+
+    return $self->{'legal_values'} = \@timezones;
+}
+
+1;
+
+__END__
+
+=head1 NAME
+
+Bugzilla::User::Setting::Timezone - Object for a user preference setting for desired timezone
+
+=head1 DESCRIPTION
+
+Timezone.pm extends Bugzilla::User::Setting and implements a class specialized for
+setting the desired timezone.
+
+=head1 METHODS
+
+=over
+
+=item C<legal_values()>
+
+Description: Returns all legal timezones
+
+Params:      none
+
+Returns:     A reference to an array containing the names of all legal timezones
+
+=back