What is 4:21 AM in 24-hour time?
👉 4:21 AM is 04:21 in 24-hour time and 0421 in military time
4:21 AM in every format
| 12-hour clock | 4:21 AM |
|---|---|
| 24-hour clock | 04:21 |
| Military time | 0421 hours |
| Military pronunciation | zero four twenty-one hours |
| ISO 8601 | T04:21:00 |
| In words | Twenty-one minutes past four |
| Part of the day | Night |
| Minutes since midnight | 261 |
| Day progress | 18.12% |
How to convert 4:21 AM to 24-hour time
For AM times keep the hour (12 AM becomes 00): 4:21 AM → 04:21.
At 4 AM early-morning workers begin to stir; delivery drivers, farmers and airport staff often start their day during this hour.
12-hour to 24-hour chart for 4 AM
| 12-hour | 24-hour | Military |
|---|---|---|
| 4:00 AM | 04:00 | 0400 |
| 4:05 AM | 04:05 | 0405 |
| 4:10 AM | 04:10 | 0410 |
| 4:15 AM | 04:15 | 0415 |
| 4:20 AM | 04:20 | 0420 |
| 4:25 AM | 04:25 | 0425 |
| 4:30 AM | 04:30 | 0430 |
| 4:35 AM | 04:35 | 0435 |
| 4:40 AM | 04:40 | 0440 |
| 4:45 AM | 04:45 | 0445 |
| 4:50 AM | 04:50 | 0450 |
| 4:55 AM | 04:55 | 0455 |
Questions about What is 4:21 AM in 24-hour time?
What is 4:21 AM in 24-hour time?
4:21 AM is 04:21. For AM times keep the hour (12 AM becomes 00): 4:21 AM → 04:21.