1 // 两个日期相差的天数2     public int differDays(String startDateString, String endDateString)3             throws ParseException {4         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");5         Date start = sdf.parse(startDateString);6         Date end = sdf.parse(endDateString);7         int differ = (int) ((end.getTime() - start.getTime()) / (3600 * 24 * 1000));8         return differ;9     }