0400 military time
0400 = 4:00 AM
0400 is 4 o’clock at night. With a colon it is 04:00.
Convert another time
How to read 0400
0400 is a morning time: keep the digits, drop the leading zero, put back the colon and add AM. 0400 is 4:00 AM.
Hours 01 to 09 read as the second digit: 04 is 4 o’clock, AM.
0400 falls in the small hours of the night: 4 hours after midnight, 16.7% of the way through the day, with 20 hours left until the next midnight.
How to say it
Pilots and air traffic controllers say each digit: “zero four zero zero”. Off the radio, people usually read 0400 as two numbers.
Counting hours to and from 0400
Start and end times on a timesheet come down to this subtraction. The decimal column is the form many payroll systems want; the minutes to decimal chart covers every minute.
| Start | Length | Decimal |
|---|---|---|
| 0600 (day before) | 22 h | 22.00 |
| 0700 (day before) | 21 h | 21.00 |
| 0800 (day before) | 20 h | 20.00 |
| 0900 (day before) | 19 h | 19.00 |
| Add | Military | 12-hour |
|---|---|---|
| 1 h | 0500 | 5:00 AM |
| 2 h | 0600 | 6:00 AM |
| 4 h | 0800 | 8:00 AM |
| 8 h | 1200 | 12:00 PM |
| 10 h | 1400 | 2:00 PM |
| 12 h | 1600 | 4:00 PM |
0400Z: the same moment in other time zones
Written 0400Z, the time is in UTC, and the local clock depends on the zone and the season.
| Zone | Standard time | Summer time |
|---|---|---|
| US Eastern (New York) | 11:00 PM (previous day) UTC−5 | 12:00 AM UTC−4 |
| US Central (Chicago) | 10:00 PM (previous day) UTC−6 | 11:00 PM (previous day) UTC−5 |
| US Mountain (Denver) | 9:00 PM (previous day) UTC−7 | 10:00 PM (previous day) UTC−6 |
| US Pacific (Los Angeles) | 8:00 PM (previous day) UTC−8 | 9:00 PM (previous day) UTC−7 |
| Alaska (Anchorage) | 7:00 PM (previous day) UTC−9 | 8:00 PM (previous day) UTC−8 |
| Hawaii (Honolulu) | 6:00 PM (previous day) UTC−10 | no change |
| UK (London) | 4:00 AM UTC+0 | 5:00 AM UTC+1 |
| Central Europe (Berlin) | 5:00 AM UTC+1 | 6:00 AM UTC+2 |
| India | 9:30 AM UTC+5:30 | no change |
| Japan and South Korea | 1:00 PM UTC+9 | no change |
| Australia East (Sydney) | 2:00 PM UTC+10 | 3:00 PM UTC+11 |
For a particular date and city, use the time zone converter, which applies the exact daylight saving dates.
Nearby military times
- 03303:30 AM
- 03453:45 AM
- 04154:15 AM
- 04304:30 AM
- 04454:45 AM
The full chart is on the military time page.