Calculating the number of days between two dates

 /**
     * 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;
            = YEAR2 YEAR1; 
            YEAR2 = tempyear; 
        } 
        IF (YEAR1 == YEAR2) { 
            int = DAY2 Days - DAY1; 
            System.out.printf ( "days apart is:% s days", Days); 
            return Days; 
        } the else { 
            DAYCOUNT = 0 int; 
            for (int I = YEAR1; I <YEAR2; I ++) { 
                IF (I. 4 == 0 &&% I = 0% 100% 400 I == 0 ||!) { 
                    DAYCOUNT + = 366; 
                } {the else 
                    DAYCOUNT + = 365; 
                } 
            } 
            System.out.printf ( "days apart is:% s days", DAYCOUNT + (DAY2-DAY1)); 
            int = DAYCOUNT days + (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);
    }