怎么加时间呀!

Question

参考：java实现    public static void main(String[] str) {
     int amount = 20;
     Date dt = new Date(System.currentTimeMillis());
        long times = dt.getTime();
        long dateMillSec = 24l * 60 * 60 * 1000 * amount;
        times = times + dateMillSec;
        Date date = new Date(times);
        System.out.println(date.toString());
    }

Answer 1

Calendar now = Calendar.getInstance();
now.add(Calendar.DAY_OF_MONTH,20);
System.out.println(now.getTime().toString());

Answer 2

var date = new Date();
date.setDate(date.getDate()+20);
alert(date.toLocaleString());

Answer 3

以MySQL数据库为例mysql>SELECT "2007-07-06 15:59:59" + INTERVAL 20 day;
执行结果: 2007-07-26 15:59:59