code: public JsonWriter propDateTime(String name, @Nullable Date value) {
      return name(name).valueDateTime(value);
    }
docs: Encodes the property name and datetime value (ISO format).
  Output is for example <code>"theDate":"2013-01-24T13:12:45+01"</code>.
  
  @throws org.sonar.api.utils.text.WriterException on any failure