You will have to modify descr_win_conditions.txt to do that. Same folder as descr_strat, and pretty easy to understand.
I know this hasn't been mentioned but if you're talking about a campaign already in progress, then changing the end date (and possibly the win conditions) will only take effect on a new campaign and not on an existing one.
I wasn't aware that it's already possible without modifying the data in the mentioned folders!
Anyway, thanks to everyone for the fast and complete replies!
Wade
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