code: public static DateInterval between(
          LocalDate start,
          LocalDate end
      ) {
  
          return DateInterval.between(PlainDate.from(start), PlainDate.from(end));
  
      }
docs: /*[deutsch]
  <p>Erzeugt ein geschlossenes Intervall zwischen den angegebenen Datumswerten. </p>
  
  @param   start   date of lower boundary (inclusive)
  @param   end     date of upper boundary (inclusive)
  @return  new date interval
  @throws  IllegalArgumentException if start is after end
  @see     #between(PlainDate, PlainDate)
  @since   4.11