PHPMixBill v5.0 - First Upload

system/autoload/Timezone.php

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+<?php
+/**
+* PHP Mikrotik Billing (www.phpmixbill.com)
+* Ismail Marzuqi <iesien22@yahoo.com>
+* @version		5.0
+* @copyright	Copyright (C) 2014-2015 PHP Mikrotik Billing
+* @license		GNU General Public License version 2 or later; see LICENSE.txt
+* @donate		PayPal: iesien22@yahoo.com / Bank Mandiri: 130.00.1024957.4
+**/
+
+class Timezone {
+    public static function timezoneList()
+    {
+        $timezoneIdentifiers = DateTimeZone::listIdentifiers();
+        $utcTime = new DateTime('now', new DateTimeZone('UTC'));
+
+        $tempTimezones = array();
+        foreach ($timezoneIdentifiers as $timezoneIdentifier) {
+            $currentTimezone = new DateTimeZone($timezoneIdentifier);
+
+            $tempTimezones[] = array(
+                'offset' => (int)$currentTimezone->getOffset($utcTime),
+                'identifier' => $timezoneIdentifier
+            );
+        }
+
+        // Sort the array by offset,identifier ascending
+        usort($tempTimezones, function($a, $b) {
+            return ($a['offset'] == $b['offset'])
+                ? strcmp($a['identifier'], $b['identifier'])
+                : $a['offset'] - $b['offset'];
+        });
+
+        $timezoneList = array();
+        foreach ($tempTimezones as $tz) {
+            $sign = ($tz['offset'] > 0) ? '+' : '-';
+            $offset = gmdate('H:i', abs($tz['offset']));
+            $timezoneList[$tz['identifier']] = '(UTC ' . $sign . $offset . ') ' .
+                $tz['identifier'];
+        }
+
+        return $timezoneList;
+    }
+}