You are dating to make the most difficult and important decision of your life; you could do with having all your faculties working properly. In which way will alcohol help you make a better decision? If you feel you need a little something to relax your nerves, perhaps there is some point.
But beyond that alcohol is not a useful ingredient in the dating process. After a couple of drinks, people often say and do things that they never intended and which contradict their own values. And if you are driving, for goodness’ sake don’t put your date’s life at risk by drinking under the influence.