What time is 00:21?
👉 00:21 in 24-hour time is 12:21 AM in 12-hour time
12:21 AM in every format
| 12-hour clock | 12:21 AM |
|---|---|
| 24-hour clock | 00:21 |
| Military time | 0021 hours |
| Military pronunciation | zero zero twenty-one hours |
| ISO 8601 | T00:21:00 |
| In words | Twenty-one minutes past midnight |
| Part of the day | Night |
| Minutes since midnight | 21 |
| Day progress | 1.46% |
How to convert 00:21 to 12-hour time
Hour 00 is the midnight hour, so write 12 and add AM: 00:21 → 12:21 AM.
Midnight starts a new calendar day. Date-based deadlines, daily counters and many scheduled computer jobs reset during this hour, and most people are asleep.
24-hour to 12-hour chart for 00:00–00:59
| 24-hour | 12-hour |
|---|---|
| 00:00 | 12:00 AM |
| 00:05 | 12:05 AM |
| 00:10 | 12:10 AM |
| 00:15 | 12:15 AM |
| 00:20 | 12:20 AM |
| 00:25 | 12:25 AM |
| 00:30 | 12:30 AM |
| 00:35 | 12:35 AM |
| 00:40 | 12:40 AM |
| 00:45 | 12:45 AM |
| 00:50 | 12:50 AM |
| 00:55 | 12:55 AM |
Questions about What time is 00:21?
What time is 00:21?
00:21 is 12:21 AM. Hour 00 is the midnight hour, so write 12 and add AM: 00:21 → 12:21 AM.