Once you pass your test I'm sure the license is immediately implied to you. After I passed my motorcycle roadtest, the tester shook my hand and said "...Congratulations, now stop at the office to receive your upgraded license and a get a new photograph taken. Your test passage will be in the system by the time you get there..."
If you were to be stopped by the police five minutes after midnight (the next day, March 15th) you would be guilty of a paperwork violation because you failed to have your license on your person, but that's probably about it. You would just need to attend court to show your valid license to the judge.
~ Blue Jays ~