Calendar start = Calendar.getInstance();

        start.set(2017, 2, 20);

        Long startTIme = start.getTimeInMillis();  

        Calendar end = Calendar.getInstance();

        end.set(2017, 2, 23);

        Long endTime = end.getTimeInMillis();  

        Long oneDay = 1000 * 60 * 60 * 24l;  

        Long time = startTIme;

        while (time <= endTime) {

            Date d = new Date(time);

            DateFormat df = new SimpleDateFormat("yyyy-MM-dd");

            System.out.println(df.format(d));

            time += oneDay;

        }