Yeah tbh took me a few mins to actually figure it out, sunday midnight imo can be interpreted 2 different ways though. But yes Miles said you'll have all day Sunday to try it out, so obviously Saturday night/Sunday morning.
I actually have next week off which is perfect for the Demo. But then I've got plans for most of the week AND Fallout 3 comes out AND with the recent patch PES2009 now works for me without crashing after a few matches. Just too much for one man :-S