Java 比较两日期相差天数

（版本1）

publicstaticint getIntervalDays(Date fDate, Date oDate) {
 
       if (null == fDate || null == oDate) {
 
           return -1;
 
       }
 
       long intervalMilli = oDate.getTime() - fDate.getTime();
 
       return (int) (intervalMilli / (24 * 60 * 60 * 1000));
 
    }

　　

 

    （版本2）

publicstaticint daysOfTwo(Date fDate, Date oDate) {
 
       Calendar aCalendar = Calendar.getInstance();
 
       aCalendar.setTime(fDate);
 
       int day1 = aCalendar.get(Calendar.DAY_OF_YEAR);
 
       aCalendar.setTime(oDate);
 
       int day2 = aCalendar.get(Calendar.DAY_OF_YEAR);
 
       return day2 - day1;
 
    }