Changing the 12-Hour Clock to the 24-Hour Clock
Maths: Year 3 & 4 National Curriculum, topic 6.2.2
Changing from the 12-Hour to the 24-Hour Clock
You may be asked to convert a time from the 12-hour clock to the 24-hour clock.
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Example problem
- What is 6.30pm in the 24-hour clock?
Change to the 24-hour clock
- 6.30pm is in the afternoon, so we need to add 12 to the first number to get the time in the 24-hour clock.
- 6 + 12 = 18
- So 6.30pm is 18.30 in the 24-hour clock.
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Example problem
- What is 8.45am in the 24-hour clock?
Change to the 24-hour clock
- 8.45am is in the morning, so the hourly time stays the same in the 24-hour clock.
- 8.45am is 08.45 in the 24-hour clock.
What about 12am?
- 12am is written as 00.00 in the 24-hour clock.
- So 12.59am would be 00.59 in the 24-hour clock.
Test yourself on Changing the 12-Hour Clock to the 24-Hour Clock
What's 3pm in the 24-hour clock?
What's 1.04am in the 24-hour clock?
Your train is scheduled to leave at 3.15pm.
What time is this in the 24-hour clock?Sheila is going horse riding at 8.30am.
What time is this in the 24-hour clock?