Clocks in France are all 24 hours. This means you may have a "rendez-vous" at 20h30 (pronounced twenty hour thirty). And you know that it is p.m. Unlike when you have a flight at 8 and you forget entirely to verify if it is morning or evening. Only to arrive at the airport at 6p.m., ticket in hand, and the desk clerk tells you that you are 11 hours late. 20h is just practical. Plus, people don't leave the house here before 8h30. I think the U.S. should have 24 hour clocks.