SimpleDateFormat解析返回年末日期

Question

I have this simple example:

SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/YY");
        System.out.println( sdf.format(new Date()));
        try {
            System.out.println(  sdf.parse("10/18/14")  );
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

In the console, I'm getting 10/18/14 Sun Dec 29 00:00:00 EST 2013

Any explanation why sdf.parse return dec 29th 2013 in stead of Oct 18th 2014

Answer 1

Your format String is YY and should be yy

SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yy");

Per the SimpleDateFormat Javadoc (which says in part),

 Letter Date or Time Component Presentation Examples G Era designator Text AD y Year Year 1996; 96 Y Week year Year 2009; 09 

Currently you're getting the Week year .

When I make the above change I get (the expected)

10/18/14
Sat Oct 18 00:00:00 EDT 2014

Answer 2

这里发生了同样的事情： SimpleDateFormat似乎给出了不正确的结果尝试先看看是否有人遇到相同的问题，这样可以更轻松，更快速地找到问题的答案。