（转）一个百度的问题...

Question

SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String str3 = "1927-12-31 23:54:07";

String str4 = "1927-12-31 23:54:08";

Date sDt3 = sf.parse(str3);

Date sDt4 = sf.parse(str4);

long ld3 = sDt3.getTime() /1000;

long ld4 = sDt4.getTime() /1000;

System.out.println(ld3);

System.out.println(ld4);

======
结果：
-1325491905
-1325491552
两者只差一秒，为什么结果却差353秒呢？这是怎么回事啊？

问题地址：http://zhidao.baidu.com/question/297274433.html

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我看了这个问题，表示我不懂
问题补充

yunzhu 写道

lc4ever 写道

这个...getTime的结果是从1970.1.1,0,0开始算的...

果然，那1970年之前的应该就有点乱了

getTime在+8的中国可不是从1970.1.1,0,0开始算的
问题补充
求来个高人分析下源码啊...我道行太浅分析不来

Answer 1

http://stackoverflow.com/questions/6841333/a-very-strange-date-before-1970

It's a time zone change on December 31st in Shanghai.

See this page for details of 1927 in Shanghai. Basically at midnight at the end of 1927, the clocks went back 5 minutes and 52 seconds. So "1927-12-31 23:54:08" actually happened twice, and it looks like Java is parsing it as the later possibly instant for that local date/time - hence the difference.

Just another episode in the often weird and wonderful world of time zones.

在1927年底时间修改了……