what is the difference between 12 and 24 hour format?
There are two ways of telling the time: The 12-hour clock runs from 1am to 12 noon and then from 1pm to 12 midnight. The 24-hour clock uses the numbers 00:00 to 23:59 (midnight is 00:00). ... In Year 2 they learn that there are 24 hours in a day, 60 minutes in an hour, and 30 minutes in half an hour.