Actually that's common. Often it says that so and so posted a year ago on a really old thread, but when you go into the forum, there's a ton of recent posts. Its just a glitch that happens once in a while. It'll probably get sorted out in AG3.
Efan, Oblivior and NoobSlayer, you are failures. Go back to your den of junkies. As Jess said, this is a common occurrence. All I know about the forty year glitch is that it has something to do with UNIX time. You can probably ask Larry about why this is happening.
It'll be fixed for AG3. The reason why the current AG can't just simply be patched has to do with the way the forums were coded. Custom coding. Strop said that a fix would require a lot of the code to be tampered with so it isn't easy.