Start practicing to read your times and dates. Europe more commonly uses 24 hour time (military time), especially on public transportation. The easiest way to convert the 24 hour time is to subtract 12 from any time past noon. For example if the time reads 15:39, subtract 12 from the first number and you get the time. 15-12 = 3, which mean 3:39 p.m.
The dates are also different, which to me makes more sense than the way we do ours in the US. They use day/month/year (small, medium, large unit of time). We'll be leaving for Italy on 17/5/12 and returning on 1/6/12. Confusing? Start practicing! Messing these up can make all the difference in the world, especially on any important paperwork you might have to do at banks or in case of an emergency, or also for reserving tickets at attractions you plan on doing on your own.