static RDate create(@Nullable TimeType value, @Nullable String tzidparam, List<String> rdtval) {
      return builder()
          .value(value)
          .tzidparam(tzidparam)
          .rdtval(rdtval)
          .build();
    }
A method for parsing an ExDate string in an {@link ExDate}

@param exDateString a string containing ExDate information, excluding the EXDATE prefix
@return an {@link ExDate}
portability-types-common/src/main/java/org/datatransferproject/types/common/models/calendar/RecurrenceRule.java