/**
  * @see	\wcf\system\template\IModifierTemplatePlugin::execute()
  */
 public function execute($tagArgs, TemplateEngine $tplObj)
 {
     if (!isset($tagArgs[1])) {
         $tagArgs[1] = TIME_NOW;
     }
     $fullInterval = false;
     if (isset($tagArgs[2])) {
         $fullInterval = $tagArgs[2];
     }
     $startTime = DateUtil::getDateTimeByTimestamp($tagArgs[1]);
     $endTime = DateUtil::getDateTimeByTimestamp($tagArgs[0]);
     return DateUtil::formatInterval($endTime->diff($startTime), $fullInterval);
 }