There is two ways to spell "Half past" in French. "Et Demie" and "Et Demi". Reason why I have "et demi" in my username is because when your talking either about "12:30 PM" or "12:30 AM", it's "et demi" without the "e". They still mean the same, just take out the "e".
Next time, I'll tell you how to say all the times in French. (:
Next time, I'll tell you how to say all the times in French. (: