12pm is something that you routinely see in the "day" life - opening/closing times, appointments, etc. That's the one I know. 12am is the other one, so it's at

12pm is something that you routinely see in the "day" life - opening/closing times, appointments, etc. That's the one I know. 12am is the other one, so it's at night. I have to deduce every time I see it.