SimpleDateFormat 解析丢失时区 [英] SimpleDateFormat parse loses timezone

问题描述

代码:

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss z");
    sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
    System.out.println(new Date());
    try {
        String d = sdf.format(new Date());
        System.out.println(d);
        System.out.println(sdf.parse(d));
    } catch (Exception e) {
        e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
    }

输出:

Thu Aug 08 17:26:32 GMT+08:00 2013
2013.08.08 09:26:32 GMT
Thu Aug 08 17:26:32 GMT+08:00 2013

请注意，format() 将 Date 正确格式化为 GMT，但 parse() 丢失了 GMT 详细信息.我知道我可以使用 substring() 来解决这个问题，但这种现象背后的原因是什么?

Note that format() formats the Date correctly to GMT, but parse() lost the GMT details. I know I can use substring() and work around this, but what is the reason underlying this phenomenon?

这是一个重复的问题答案.

让我换一种方式提出问题，检索 Date 对象以使其始终处于 GMT 的方法是什么?

Let me put the question in another way, what is the way to retrieve a Date object so that its always in GMT?

推荐答案

我只需要这个:

SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss");
sdf.setTimeZone(TimeZone.getTimeZone("GMT"));

SimpleDateFormat sdfLocal = new SimpleDateFormat("yyyy.MM.dd HH:mm:ss");

try {
    String d = sdf.format(new Date());
    System.out.println(d);
    System.out.println(sdfLocal.parse(d));
} catch (Exception e) {
    e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
}

输出:有点可疑，但我只希望日期一致

Output : slightly dubious, but I want only the date to be consistent

2013.08.08 11:01:08
Thu Aug 08 11:01:08 GMT+08:00 2013

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