Add time zone class

include/class.timezone.php

+<?php
+/*********************************************************************
+    class.timezone.php
+
+    Time zone get utils.
+
+    Peter Rotich <peter@osticket.com>
+    Copyright (c)  2006-2012 osTicket
+    http://www.osticket.com
+
+    Released under the GNU General Public License WITHOUT ANY WARRANTY.
+    See LICENSE.TXT for details.
+
+    vim: expandtab sw=4 ts=4 sts=4:
+**********************************************************************/
+
+class Timezone {
+
+    var $id;
+    var $ht;
+
+    function Timezone($id){
+        $this->id=0;
+        return $this->load($id);
+    }
+
+    function load($id=0) {
+
+        if(!$id && !($id=$this->getId()))
+            return false;
+
+        $sql='SELECT * FROM '.TIMEZONE_TABLE.' WHERE timezone_id='.db_input($id);
+        if(!($res=db_query($sql)) || !db_num_rows($res))
+            return false;
+
+        $this->ht=db_fetch_array($res);
+        $this->id=$this->ht['timezone_id'];
+        
+        return $this->id;
+    }
+
+    function reload() {
+        return $this->load();
+    }
+
+    function getId() { 
+        return $this->id;
+    }
+        
+    function getOffset() {
+        return $this->ht['offset'];    
+    }
+
+    function getName() {
+        return $this->info['timezone'];
+    }
+
+    function getDesc() {
+        return $this->getName();
+    }
+
+    /* static functions */
+    function lookup($id) {
+        return ($id && is_numeric($id) && ($tz= new Timezone($id)) && $tz->getId()==$id)?$tz:null;
+    }
+
+    function getOffsetById($id) {
+        return ($tz=Timezone::lookup($id))?$tz->getOffset():0;
+    }
+}
+?>