How do you convert 12 hours to 24 hours?

Related questions

1. Is 12 o'clock lunchtime AM or PM?
2. Do titles have periods?
3. Why do we use AM and PM?
4. Why are there 24 hours in a day?
5. How do you say 0000 hours?
6. Is 12am the next day?
7. Is 12 pm at night or in the morning?
8. Is it AM or PM?
9. Why is a day 24 hours long on earth?
10. How is AM and PM written?

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