public static boolean isNull(Timestamp timestamp){
  return ((timestamp == null) || (timestamp.getTime() == NULL_TIME));
}

public static boolean isNull ( Timestamp timestamp ) { return ( ( timestamp == null ) || ( timestamp . getTime ( ) == NULL_TIME ) ) ; }
return null if timestamp is null or equals " january 1 , 1970 00 : 00 : 00 " .
