java时间操作

public static int 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));
}

public static int 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;
}