private static function getDayNames($day, $shorten = false, $len = 1, $numeric = false)
{
$days = array('sat' => array(1, 'شنبه'), 'sun' => array(2, 'یکشنبه'), 'mon' => array(3, 'دوشنبه'), 'tue' => array(4, 'سه شنبه'), 'wed' => array(5, 'چهارشنبه'), 'thu' => array(6, 'پنجشنبه'), 'fri' => array(7, 'جمعه'));
$day = substr(strtolower($day), 0, 3);
$day = $days[$day];
return $numeric ? $day[0] : ($shorten ? self::substr($day[1], 0, $len) : $day[1]);
}