java 获取两个日期之间的天数

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public static String calcTwoDate(Date date ,Date date2){
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        Calendar calendar2 = Calendar.getInstance();
        calendar2.setTime(date2);

        long n  =(calendar.getTimeInMillis()-calendar2.getTimeInMillis())/(24*60*60*1000);
        return String.valueOf(Math.abs(n));
    }