Convert between 12-hour and 24-hour time
Key Notes :
In 24-hour time, 00:00 is midnight and 12:00 is noon. In 12-hour time, 12:00 A.M. is midnight and 12:00 P.M. is noon.
To convert from 12-hour time to 24-hour time:
- If the time is between 12:00 A.M. and 12:59 A.M., subtract 12 hours.
- If the time is between 1:00 A.M. and 12:59 P.M., you do not need to add or subtract.
- If the time is between 1:00 P.M. and 11:59 P.M., add 12 hours.
Do not include A.M. or P.M.
Learn with an example
🎯 Write 1:00 P.M. as a 24-hour time.
Write your answer using only numbers and a colon (for example, 03:15).
1:00 P.M. is between 1:00 P.M. and 11:59 P.M. Add 12:00:
01:00 + 12:00 = 13:00
🎯 Write 8:00 P.M. as a 24-hour time.
Write your answer using only numbers and a colon (for example, 03:15).
8:00 P.M. is between 1:00 P.M. and 11:59 P.M. Add 12:00:
08:00 + 12:00 = 20:00
🎯 Write 21:00 as a 12-hour time.
Write your answer using only numbers, a colon, and A.M. or P.M. (for example, 3:15 A.M.).
21:00 is between 13:00 and 23:59. Subtract 12:00 and write the time with 3 digits:
21:00 − 12:00 = 9:00
Include P.M. because the time is afternoon.
9:00 P.M.
let’s practice!
