code: public LocalDate getStartAsLocalDate() {
  
          PlainDate date = this.getStartAsCalendarDate();
          return ((date == null) ? null : date.toTemporalAccessor());
  
      }
docs: /*[deutsch]
  <p>Liefert das Startdatum. </p>
  
  @return  start date or {@code null} if infinite
  @see     Boundary#isInfinite()
  @since   4.11