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【How-to】What is 21h in time
A number of countries, particularly English-speaking, use the 12-hour clock, or a mixture of the 24- and 12-hour time systems. In countries where the 12-hour clock is dominant, some professions prefer to use the 24-hour clock.
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24-hour clock.
| 24-hour clock | 12-hour clock |
|---|---|
| 20:00 | 8:00 p.m. |
| 21:00 | 9:00 p.m. |
| 22:00 | 10:00 p.m. |
| 23:00 | 11:00 p.m. |
