A clock with hands (an analogue clock) shows us the numbers 1-12 ... The first two digits show the hour and the last two digits show the minutes. We don't use AM or PM here, because the time ...

O'clock is a way of telling the exact hour on a clock. We say "o'clock" when the minute hand (the long hand) points to the number 12 on the clock. When the minute hand points straight up to 12 ...