为什么我的历元值无法获得正确的人类可读的日期和时间值？

Question

I want to bulk convert my epoch values into human readable date and time value. Taking a value 1342179766, I converted it on epoch-converter and got Fri, 13 Jul 2012 11:42:46 GMT as answer which I know is correct. Now I used the java code provided on their site to convert it into date and time format but I am getting wrong answer. Code:

String date = new java.text.SimpleDateFormat("MM/dd/yyyy HH:mm:ss").format(new java.util.Date (1342179766*1000));
System.out.println(date);

Output:

12/07/1969 09:40:02

I looked at other questions on stackoverflow but mostly this code is given everywhere. I found 2-3 other code but all of them are also giving me same output.

Answer 1

我猜您应该使用1342179766L*1000L而不是1342179766*1000 。

Answer 2

Your issue comes from the fact that Java is trying to do integer multiplication on 1342179766*1000 and then convert it into a long. If you explicitly make this a long, then it works:

String date = new java.text.SimpleDateFormat("MM/dd/yyyy HH:mm:ss").format(new java.util.Date (1342179766L*1000));
System.out.println(date);