Different time formats might seem baffling at first, but the 12-hour and 24-hour clocks each tell fascinating stories about how we've measured our days throughout history. The familiar 12-hour system, ...

An analogue clock, a clock with hands, shows the numbers 1 through to 12. It is a 12-hour clock. The first 12 hours of the day, from midnight to midday, are called am. The next 12 hours, from midday ...