I was groping at straws with that one
I couldn't understand how the dates could be the same when posted on different days.
I did have check the look and layout settings but couldn't see anything that would screw the year displayed by over two years, it just shows the usual date formats, dd-mm-yyyy, yyyy-mm-dd, etc. or the forum default. Where the variable retrieves the date from is the question, I would assume the system time on the forum's server.
Though why they would show the same date when they were posted on different days is weird, regardless of the date format chosen. I guess we will have to wait for Richard to get back to us and confirm his settings.