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.

🥏 To convert from 24-hour time to 12-hour time:

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 24-hour time to 12-hour time:

  • If the time is between 00:00 and 00:59, add 12 hours.
  • If the time is between 01:00 and 12:59, you do not need to add or subtract.
  • If the time is between 13:00 and 23:59, subtract 12 hours.

Write A.M. for times before noon and P.M. for times after noon.

Learn with an example

📢 Write 3:45 P.M. as a 24-hour time.

Write your answer using only numbers and a colon (for example, 03:15).

3:45 P.M. is between 1:00 P.M. and 11:59 P.M. Add 12:00:

03:45 + 12:00 = 15:45

📢 Write 11:45 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.).

11:45 is between 01:00 and 12:59. You do not need to add or subtract anything. Include A.M. because the time is before noon.

11:45 A.M.

Write 08:45 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.).

08:45 is between 01:00 and 12:59. You do not need to add or subtract anything. Write the time with 3 digits.

8:45

Include A.M. because the time is before noon.

8:45 A.M.

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