In Stack Overflow, the time is shown wrong for answers and comments. When the post is just 20 mins old, the comments and answers say that they are 12 hours old. I have seen this mistake in more than one post. What is the problem that the timer/clock faces?

Take a look at that please

On Stack Overflow, the time shown for answers and comments is incorrect. When the post is just 20 mins old, the comments and answers say that they are 12 hours old. I have seen this mistake in more than one post. What is the problem with the clock / time display?

Please, take a look at that.