Hi poppo,
At this time CC tournaments can only be setup with the 24, 48 or 72 hour end option. There isn't a way to setup your own specific dates or times. For verification you'll just want to check the leaderboard for the tournament. When you create a CC tournament all members of the club are listed on the leaderboard either as "Not Entered", "Not Played" or it'll have their score if they've completed their round.