java之日期的一些操作

//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()));

}