/**
  * 
  * @param string $strLocalDateTime Date time
  * @param string $strLocalTimeZone Local time zone
  * @param string $strTargetTimeZone Target time zone
  * @param string $strFormat Format
  * @return string Date time
  */
 public static function convertDateTime($strLocalDateTime, $strLocalTimeZone, $strTargetTimeZone, $strFormat = "Y-m-d H:i:s")
 {
     $dateTime = new self($strLocalDateTime, $strLocalTimeZone);
     return $dateTime->getDateTimeForTimeZone($strTargetTimeZone, $strFormat);
 }