What is the probability of being born the exact same date (not year), and time of my girlfriend?

well theres nothing wrong with that this way you really know if the probability of being a couple out weighs everything else your four years a part thats fine it just brings you closer together in alot of ways your birthdays thats a plus you probably would have found each other anyway you can celebrate everything together its probably just by coincidence that you have the same birthday the same biological clock so to speak and be able to turn to one another and say hey you would be together by one to 4 years anyway it could be one in 4 that come to realize that happy to find each other