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The 24-Hour Clock
A day has 24 hours. A clock has 12 hours.This means that every time will happen twice each day.
The 24-Hour Day
half past 9 in the morning half past 9 at night
We have a few ways to tell the difference between these two times. One way is to use a.m. and p.m.
The 24-Hour Day
a.m. (ante meridiem – before noon)
9:30 p.m.
p.m. (post meridiem – after noon)
9:30 a.m.
Another way is to use a 24-hour clock.
The 24-Hour Day
21:309:30
Instead of going back to the start after 12, the 24-hour clock carries on until midnight.
The hours after 12 noon are given the numbers 13:00 to 23:00.
A four-digit format is used.Two digits for the hour, a colon (:) and two digits for the minutes.
This clock and table show the corresponding hours on a 24-hour clock.
The 24-Hour Day
Midnight can be referred to as either
00:00 or 24:00
To change 12-hour a.m. times to 24-hour times, make sure the time is in a four-digit format. You do not need to write ‘a.m.’
Changing 12-Hour Timesto 24-Hour Times
10:30 a.m. 10:30
2:45 a.m. 02:45
Change these a.m. times into 24-hour times.
Changing 12-Hour Timesto 24-Hour Times
11:30 a.m.
11:30
6:45 a.m.
06:45
3:15 a.m.
03:15
10:00 a.m.
10:00
To change 12-hour p.m. times to 24-hour times, add 12 to the hour time. You do not need to write ‘p.m.’
Changing 12-Hour Timesto 24-Hour Times
10:30 p.m. 22:30
3:45 p.m. 15:45
Changing 12-Hour Timesto 24-Hour Times
10:45 p.m.
22:45
5:30 p.m.
17:30
9:15 p.m.
21:15
7:00 p.m.
19:00
Changing 12-Hour Timesto 24-Hour Times
5:45 a.m.
05:45
7:30 p.m.
19:30
11:15 a.m.
11:15
1:00 p.m.
13:00
Changing 12-Hour Timesto 24-Hour Times
5:45 p.m.
17:45
2:15 a.m.
02:15
6:15 p.m.
18:15
10:15 a.m.
10:15
Here is a TV schedule. The times are written in a 12-hour format. Convert the times to a 24-hour format.
TV Schedule
If the hour is less than 12, just add ‘a.m.’ at the end. If the time begins with a zero, you do not need to include it in the 12-hour time.
Changing 24-Hour Timesto 12-Hour Times
11:15 11:15 a.m.
04:45 4:45 a.m.
Changing 24-Hour Timesto 12-Hour Times
10:45
10:45 a.m.
07:45
7:45 a.m.
03:15
3:15 a.m.
11:00
11:00 a.m.
If the hour is between 13 and 23, subtract 12 from the hour and add ‘p.m.’ at the end.
Changing 24-Hour Timesto 12-Hour Times
21:15 9:15 p.m.
13:45 1:45 p.m.
Changing 12-Hour Timesto 24-Hour Times
22:45
10:45 p.m.
21:30
9:30 p.m.
20:15
8:15 p.m.
14:00
2:00 p.m.
Changing 24-Hour Timesto 12-Hour Times
05:15
5:15 a.m.
17:30
5:30 p.m.
10:15
10:15 a.m.
15:00
3:00 p.m.
Changing 24-Hour Timesto 12-Hour Times
06:45
6:45 a.m.
20:45
8:45 p.m.
16:15
4:15 p.m.
08:30
8:30 p.m.
Here is the bus timetable for the journey from Burnton to Lingley. The times are written in a 24-hour format.
Bus Timetable
Convert the times into a 12-hour format, using a.m. and p.m.
Sort these times into order from the earliest in the day to the latest.
Time Teasers
04:3011:05 a.m.
16:15
9:00 p.m.quarter to
eight in the morning
half past one in the afternoon
Where would you put this clock face into the timeline below?
Time Teasers
04:30quarter to
eight in the morning
11:05 a.m.
half past one in the afternoon
16:15 9:00 p.m.
We do not know if the time shown on the analogue
clock is in morning or the afternoon, so it could go in
either of these places.
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