0000 military time
0000 = 12:00 AM
0000 is midnight, the start of the day. With a colon it is 00:00.
Convert another time
How to read 0000
0000 is in the first hour of the day, the 12 AM hour: replace 00 with 12 and add AM. 0000 is midnight itself, the start of the day.
Hour 00 reads as 12 on a 12-hour clock, and it is AM.
NIST’s way around the ambiguity of “12 a.m.” is 0000 for midnight at the start of a date and 2400 for its end. So 0000 on Saturday and 2400 on Friday are the same instant.
0000 is the very start of the day, with 24 hours to run.
How to say it
Pilots and air traffic controllers say each digit: “zero zero zero zero”.
Counting hours to and from 0000
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) | 18 h | 18.00 |
| 0700 (day before) | 17 h | 17.00 |
| 0800 (day before) | 16 h | 16.00 |
| 0900 (day before) | 15 h | 15.00 |
| Add | Military | 12-hour |
|---|---|---|
| 1 h | 0100 | 1:00 AM |
| 2 h | 0200 | 2:00 AM |
| 4 h | 0400 | 4:00 AM |
| 8 h | 0800 | 8:00 AM |
| 10 h | 1000 | 10:00 AM |
| 12 h | 1200 | 12:00 PM |
0000Z: the same moment in other time zones
Written 0000Z, 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) | 7:00 PM (previous day) UTC−5 | 8:00 PM (previous day) UTC−4 |
| US Central (Chicago) | 6:00 PM (previous day) UTC−6 | 7:00 PM (previous day) UTC−5 |
| US Mountain (Denver) | 5:00 PM (previous day) UTC−7 | 6:00 PM (previous day) UTC−6 |
| US Pacific (Los Angeles) | 4:00 PM (previous day) UTC−8 | 5:00 PM (previous day) UTC−7 |
| Alaska (Anchorage) | 3:00 PM (previous day) UTC−9 | 4:00 PM (previous day) UTC−8 |
| Hawaii (Honolulu) | 2:00 PM (previous day) UTC−10 | no change |
| UK (London) | 12:00 AM UTC+0 | 1:00 AM UTC+1 |
| Central Europe (Berlin) | 1:00 AM UTC+1 | 2:00 AM UTC+2 |
| India | 5:30 AM UTC+5:30 | no change |
| Japan and South Korea | 9:00 AM UTC+9 | no change |
| Australia East (Sydney) | 10:00 AM UTC+10 | 11:00 AM UTC+11 |
For a particular date and city, use the time zone converter, which applies the exact daylight saving dates.
Nearby military times
The full chart is on the military time page.