code: public static KoreanCalendar ofNewYear(int gregorianYear) {
  
          return KoreanCalendar.of(EastAsianYear.forGregorian(gregorianYear), EastAsianMonth.valueOf(1), 1);
  
      }
docs: /*[deutsch]
  <p>Erzeugt ein neues koreanisches Kalenderdatum am traditionellen Neujahrstag. </p>
  
  @param   gregorianYear   gregorian calendar year
  @return  new instance of {@code KoreanCalendar}
  @throws  IllegalArgumentException in case of any inconsistencies