This decimal clock was made by Pierre Daniel Destigny in Rouen, France, between 1798 and 1805. | DeFacto, Wikimedia Commons // CC BY-SA 4.0 Everybody knows that there are 24 hours in a day ...

Il est dix heures et demie. It is really common for French speakers to use the 24-hour clock.‎ So 8pm is…. Il est vingt heures. Il est vingt heures vingt. Il est vingt heures trente.