code: private static Date rollGetDate(Calendar calendar, int days) {
  		Calendar easterSunday = (Calendar) calendar.clone();
  		easterSunday.add(Calendar.DATE, days);
  		return easterSunday.getTime();
  	}
docs: Add the given number of days to the calendar and convert to Date.
  
  @param calendar
  The calendar to add to.
  @param days
  The number of days to add.
  @return The date object given by the modified calendar.