Convert 12-hour time to 24-hour time with this printable worksheet.

Let’s go through each problem one by one. We’re converting 12-hour time (with am/pm) to 24-hour time.

Here’s the rule:
- For am times:
→ If it’s 12:xx am, change to 00:xx
→ Otherwise, just drop the “am” — keep the same numbers.
- For pm times:
→ If it’s 12:xx pm, keep as 12:xx
→ Otherwise, add 12 to the hour part, then drop the “pm”.

Let’s apply this:

1. 3:35pm → 3 + 12 = 15 → 15:35
2. 8:55am → just drop am → 08:55
3. 9:15pm → 9 + 12 = 21 → 21:15
4. 6:40am → drop am → 06:40
5. 5:00pm → 5 + 12 = 17 → 17:00
6. 4:45am → drop am → 04:45
7. 7:30pm → 7 + 12 = 19 → 19:30
8. 2:35am → drop am → 02:35
9. 4:15pm → 4 + 12 = 16 → 16:15
10. 5:30am → drop am → 05:30

Now the second column:

11. 6:45pm → 6 + 12 = 18 → 18:45
12. 10:55am → drop am → 10:55
13. 10:00pm → 10 + 12 = 22 → 22:00
14. 11:15am → drop am → 11:15
15. 3:50pm → 3 + 12 = 15 → 15:50
16. 9:20am → drop am → 09:20
17. 7:35pm → 7 + 12 = 19 → 19:35
18. 2:50am → drop am → 02:50
19. 10:25pm → 10 + 12 = 22 → 22:25
20. 11:30am → drop am → 11:30

Double-checking a few:
- 5:00pm → 17:00 ✔️
- 12:xx isn’t here, so no special case needed.
- All am times under 12 stay the same with leading zero if needed (like 08:55).
- All pm times over 12 get +12 to the hour.

All look correct.

Final Answer:
1. 15:35
2. 08:55
3. 21:15
4. 06:40
5. 17:00
6. 04:45
7. 19:30
8. 02:35
9. 16:15
10. 05:30
11. 18:45
12. 10:55
13. 22:00
14. 11:15
15. 15:50
16. 09:20
17. 19:35
18. 02:50
19. 22:25
20. 11:30