It's very hard to fix such timestamps of posts - I don't think you can actually do it from the forums, but an admin has to do it via more direct access to the database, which I hadn't thought of doing before And I certainly can't do it now, due to the effort required to find these handful of posts in the whole database - it might have been easier had I thought of doing it whilst the place was closed to prevent more muckups but it's kinda late now a few hundred posts later