code: @Nullable
    public Date getIncorporationDate() {
      if (incorporationDay == null || incorporationMonth == null || incorporationYear == null) {
        return null;
      }
  
      GregorianCalendar calendarDay = new GregorianCalendar(incorporationYear, incorporationMonth, incorporationDay);
      return calendarDay.getTime();
    }
docs: Gets the date of incorporation.
  
  @return the incorporation date