code: protected String describe(final On on, final boolean and) {
          if (and) {
              return nominalValue(on.getTime());
          }
          return String.format("%s %s ", bundle.getString("at"), nominalValue(on.getTime())) + "%s";
      }
docs: Provide a human readable description for On instance.
  
  @param on - On
  @return human readable description - String