I admit I completed my plugin rather at the last minute, but based on this http://www.timeanddate.com/worldclock/city.html?n=204, I had at least 45 minutes to spare before 23h59, Prague time. Presumably the + 2 in the contest was decided upon before the DST time switch. Anyway, I'm pretty disappointed that I got caught in this silly mistake. I hope nobody else made the same error.
What is odd, however, is that the upload time of my plugin says 01h09. Even if was off by one hour because of DST, I would've expected the upload time to be 00h09.
Anyway, it looks like good weather for the weekend in Prague (see attachment).