code: public static boolean isDateTime(QueryParameter qp) {
  		String className = qp.getValueClassName();
  		return className.equals(QueryParameter.DATE_VALUE) ||
  			   className.equals(QueryParameter.TIME_VALUE) ||
  			   className.equals(QueryParameter.TIMESTAMP_VALUE);
  	}
docs: Test if a parameter has a date or time class name: Date, Time, Timestamp
  @param qp parameter
  @return true if a parameter has a date or time class name