code: public static Year toYear(final Calendar self) {
          return Year.of(self.get(Calendar.YEAR));
      }
docs: Converts the Calendar to a corresponding {@link java.time.Year}.  If the Calendar has a different
  time zone than the system default, the Year will be adjusted into the default time zone.
  
  @param self a Calendar
  @return a Year
  @since 2.5.0