No, you would have to book the 30th and 1st seperatly and then make a new reservation for the remainder 7 nights with the discount. So you would have to make 2 deposits.
But it would work in your best interest to do this anyway because the rate you check in on is the rate you pay for the entire stay even if it goes into a different season. So you would want to just to save money even if it was at rack rate