Learning to tell time in French can be hard, however, if you know your French numbers then it should be a breeze.
Example: Il est quelle heure? (What time is it?)
Il est... (insert time here) heures, like: il est une heure (It's 1 o'clock...notice no "s" with "heure" here because one hour or 1 o'clock is singular. Other hours use the "s" because they are more than one like 2, 3, etc.)
In addition, it's a lot harder telling time once you get past the regular time and then go to military time(and yes that is used in French time. lol)
I have a chart of the french numbers that I keep in my study area(you should too).