What is 0400 Military Time?
0400 is
4:00 AM
AMSpoken as: Zero Four Hundred Hours
0400 in military time is 4:00 AM in standard 12-hour format, spoken as Zero Four Hundred Hours. Military time runs from 0000 at midnight to 2359 at night. It is used in US military operations, NATO communications, hospital shift records, aviation flight plans, and emergency dispatch worldwide.
How to Read 0400 Military Time
- 1
Take the first two digits: 04 is the hour.
- 2
4 is less than 12 — this is morning. Keep the hour as 4.
- 3
The period is AM (morning).
- 4
Last two digits are minutes: 00.
Therefore 0400 = 4:00 AM.
What Is Military Time?
Military time is a 24-hour clock system used by the US military, hospitals, emergency services, and aviation. It runs from 0000 (midnight) to 2359 (11:59 PM), eliminating AM/PM ambiguity.
When is 0400 used?
0400 falls in the pre-dawn window — a period of peak operational sensitivity in military contexts. Night shifts, overnight watches, and early morning stand-to operations occur between 0100 and 0500. In hospitals, these are the hours for overnight nursing rounds. Emergency dispatchers log the highest fatigue-related risk during this range.
Military Time Conversion Chart
| Military | Standard | Spoken |
|---|---|---|
| 0000 | 12:00 AM | Zero Hundred Hours |
| 0100 | 1:00 AM | Zero One Hundred Hours |
| 0200 | 2:00 AM | Zero Two Hundred Hours |
| 0300 | 3:00 AM | Zero Three Hundred Hours |
| 0400 | 4:00 AM | Zero Four Hundred Hours |
| 0500 | 5:00 AM | Zero Five Hundred Hours |
| 0600 | 6:00 AM | Zero Six Hundred Hours |
| 0700 | 7:00 AM | Zero Seven Hundred Hours |
| 0800 | 8:00 AM | Zero Eight Hundred Hours |
| 0900 | 9:00 AM | Zero Nine Hundred Hours |
| 1000 | 10:00 AM | Ten Hundred Hours |
| 1100 | 11:00 AM | Eleven Hundred Hours |
| 1200 | 12:00 PM | Twelve Hundred Hours |
| 1300 | 1:00 PM | Thirteen Hundred Hours |
| 1400 | 2:00 PM | Fourteen Hundred Hours |
| 1500 | 3:00 PM | Fifteen Hundred Hours |
| 1600 | 4:00 PM | Sixteen Hundred Hours |
| 1700 | 5:00 PM | Seventeen Hundred Hours |
| 1800 | 6:00 PM | Eighteen Hundred Hours |
| 1900 | 7:00 PM | Nineteen Hundred Hours |
| 2000 | 8:00 PM | Twenty Hundred Hours |
| 2100 | 9:00 PM | Twenty One Hundred Hours |
| 2200 | 10:00 PM | Twenty Two Hundred Hours |
| 2300 | 11:00 PM | Twenty Three Hundred Hours |
Frequently Asked Questions
- What is 0400 military time?
- 0400 military time is 4:00 AM in standard 12-hour time.
- How do you say 0400 in military time?
- 0400 is spoken as "Zero Four Hundred Hours" in military time.
- Is 0400 military time AM or PM?
- 0400 military time is AM. Hours 0000–1159 in military time are AM.
- What time is 0400 hours?
- 0400 hours is 4:00 AM. Military time values below 1200 are morning (AM).
- How do you convert 0400 military time to regular time?
- 0400 is below 1200, so just read the hour directly: 04 = 4 AM.