code: public int lengthOfYear() {
  
          int isoYear = this.iso.getYear();
  
          if (isoYear >= 1941) {
              return this.iso.lengthOfYear();
          } else if (this.iso.getMonth() >= 4) {
              if (isoYear == 1940) {
                  return 275;
              } else {
                  return (GregorianMath.isLeapYear(isoYear + 1) ? 366 : 365);
              }
          } else {
              return (this.iso.isLeapYear() ? 366 : 365);
          }
  
      }
docs: /*[deutsch]
  <p>Liefert die L&auml;nge des aktuellen Jahres in Tagen. </p>
  
  @return  int
  @since   3.19/4.15