code: public void addFloatingDate(ICalProperty property, ICalDate date) {
  		floatingDates.add(new TimezonedDate(date, property));
  	}
docs: Keeps track of a date-time property that does not have a timezone
  (floating time), so it can be added to the {@link TimezoneInfo} object
  after the iCalendar object is parsed.
  @param property the property
  @param date the property's date value