Implement the Timezone class.

php/timezone.php

@@ -0,0 +1,76 @@
+<?php
+/*
+ * @package		Timezone Detect
+ * @author      Pap Tamas
+ * @copyright   (c) 2013 Pap Tamas
+ * @website		https://github.com/paptamas/timezones
+ * @license		http://opensource.org/licenses/MIT
+ *
+ */
+class Timezone  {
+
+    /**
+     * Get the timezone list
+     *
+     * @return  array
+     */
+    public static function get_timezone_list()
+    {
+        return require 'timezone_list.php';
+    }
+
+    /**
+     * Detect the timezone id(s) from an offset and dst
+     *
+     * @param   int     $offset
+     * @param   int     $dst
+     * @param   bool    $multiple
+     * @param   string  $default
+     * @return  string|array
+     */
+    public static function detect_timezone_id($offset, $dst, $multiple = FALSE, $default = 'UTC')
+    {
+        $detected_timezone_ids = array();
+
+        // Get the timezone list
+        $timezones = self::get_timezone_list();
+
+        // Try to find a timezone for which both the offset and dst match
+        foreach ($timezones as $timezone_id)
+        {
+            $timezone_data = self::get_timezone_data($timezone_id);
+            if ($timezone_data['offset'] == $offset && $dst == $timezone_data['dst'])
+            {
+                array_push($detected_timezone_ids, $timezone_id);
+                if ( ! $multiple)
+                    break;
+            }
+        }
+
+        if (empty($detected_timezone_ids))
+        {
+            $detected_timezone_ids = array($default);
+        }
+
+        return $multiple ? $detected_timezone_ids : $detected_timezone_ids[0];
+    }
+
+    /**
+     * Get the current offset and dst for the given timezone id
+     *
+     * @param   string  $timezone_id
+     * @return  int
+     */
+    public static function get_timezone_data($timezone_id)
+    {
+        $date = new DateTime("now");
+        $date->setTimezone(timezone_open($timezone_id));
+
+        return array(
+            'offset' => $date->getOffset() / 3600,
+            'dst' => intval(date_format($date, "I"))
+        );
+    }
+}
+
+// END Timezone