code: public void setInto(ReadWritableInterval writableInterval, Object object, Chronology chrono) {
          ReadableInterval input = (ReadableInterval) object;
          writableInterval.setInterval(input);
          if (chrono != null) {
              writableInterval.setChronology(chrono);
          } else {
              writableInterval.setChronology(input.getChronology());
          }
      }
docs: Extracts interval endpoint values from an object of this converter's
  type, and sets them into the given ReadWritableInterval.
  
  @param writableInterval interval to get modified, not null
  @param object  the object to convert, must not be null
  @param chrono  the chronology to use, may be null
  @throws ClassCastException if the object is invalid