I agree that this is all kind of silly. On all my apps I just put 31DECXX because I graduated in December. I am sure I could find the date I 'walked' but who cares. I have had 3 RJ job offers, an LLC, 2 ACMIs, and a legacy. No one has ever even mentioned my undergrad degree other than to ask how professor X is doing. Once you have confirmation that you are graduating - check the box, and put the last day of the month. Congrats on the degree!