code: public StructuredQueryBuilder.Period period(String start, String end) {
      return new TemporalPeriod(start, end);
    }
docs: Construct a temporal period for use in {@link #temporalPeriodRange temporalPeriodRange}
  queries.
  @param start the start date/time for this period, in ISO 8601 format
  @param end   the end date/time for this period, in ISO 8601 format
  @return a temporal period