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I see that XF "Close this poll after" only let us select fixed hours/days/etc.
Why not a user defined date/hour? I think would be better to let us select the precise day ... say "31-01-2010 00:00".
How would you implement it? Something like this would be activated via cron. You'd have to run that particular cron job continuously in order for it to work. Not something I want running in the background all the time.