code: protected static void timestampFormat(DateFormat format, String... attributeNames) {
          ModelDelegate.timestampFormat(modelClass(), format, attributeNames);
      }
docs: Registers date format for specified attributes. This format will be used to convert between
  Date -> String -> java.sql.Timestamp when using the appropriate getters and setters.
  
  <p>See example in {@link #timestampFormat(String, String...)}.
  
  @param format format to use for conversion
  @param attributeNames attribute names