计算两个日期相差天数

 /**
     * 计算两个日期相差天数
     */
    public static int compareDays(Date date1, Date date2){
        Calendar calendar1 = Calendar.getInstance();
        Calendar calendar2 = Calendar.getInstance();
        calendar1.setTime(date1);
        calendar2.setTime(date2);
        int day1 = calendar1.get(Calendar.DAY_OF_YEAR);
        int day2 = calendar2.get(Calendar.DAY_OF_YEAR);
        int year1 = calendar1.get(Calendar.YEAR);
        int year2 = calendar2.get(Calendar.YEAR);
        if(year1 > year2) {
            int tempyear = year1;
            int tempday = day1;
            day1 = day2;
            day2 = tempday;
            year1 = year2;
            year2 = tempyear;
        }
        if (year1 == year2) {
            int days = day2 - day1;
            System.out.printf("相隔的天数为:%s天", days);
            return days;
        } else {
            int DayCount = 0;
            for (int i = year1; i < year2; i++) {
                if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0) {
                    DayCount += 366;
                }else {
                    DayCount += 365;
                }
            }
            System.out.printf("相隔的天数为:%s天", DayCount+(day2-day1));
            int days = DayCount+(day2-day1);
            return days;
        }
    }



    public static void main(String[] args) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd H:m:s");
        Date date1 = null;
        Date date2 = null;
        try {
//            date2 = dateFormat.parse("2019-11-18 12:01:32");
            date1 = dateFormat.parse("2019-11-16 23:59:32");
        } catch (ParseException e) {
            e.printStackTrace();
        }
        int i = compareDays(date1, getCurrentDate());
        System.out.println(i);
    }