Oh, I think you are asking a question… To know if the time is AM or PM on a 24-hour clock, all you need to remember is that any hour after and including 12 is PM (so 12:00, 13:00, 15:00, 20:00 are all PM) and anything before 12 is AM (so 1:00, 3:00, 8:00, and 11:00 are all AM).