[Raapys]

Yah, I changed start date to 2500.3 something'ish and after 100 turns I got the demo message thingy. I even used a program called Cheat-o-matic to change the date in-game on the fly, and even that didn't yield any positive results. So I suspect there's some code that keeps track on the amount of turns the game has processed, totally independant of what the Current Date thingy says.