//获取两个日期之间的相差天数 

   public static int differentDaysByMillisecond(Date date1, Date date2){

        int days = (int) ((date2.getTime() - date1.getTime()) / (1000*3600*24));

        return days;

    }

    //

    public static Date getOperateDate(Date time) {

        Calendar calendar = Calendar.getInstance().getInstance();

        calendar.setTime(time);

        calendar.add(Calendar.MONTH, 1);

        calendar.set(Calendar.DAY_OF_MONTH, 5);

        return calendar.getTime();

    }

    public static void main(String[] args) throws ParseException {

        Date repaymentTime = new SimpleDateFormat("yyyy-MM-dd").parse("2017-1-5");

        Date nowTime = new SimpleDateFormat("yyyy-MM-dd").parse("2017-2-27");

        System.out.println("相差天数:" + differentDaysByMillisecond(repaymentTime, nowTime));

        System.out.println("处理后的日期:" + getOperateDate(new Date()));

    }

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java之日期的一些操作