0100 military time is 1:00 AM
0100 military time is 1:00 AM, or one o'clock in the morning. It is said aloud as "zero one hundred". It is in the small hours of the night, 1 hour after midnight and 23 hours before the next midnight. With a colon, in the 24-hour clock most of the world writes, it is 01:00.
- Standard time
- 1:00 AM
- Said aloud
- zero one hundred
- 24-hour clock
- 01:00
- Part of the day
- Night
- After midnight
- 1 hour
- Until midnight
- 23 hours
How to convert 0100 military time to standard time
0100 is a morning time, so the hour does not change: take the leading zero off the 01, keep the 00, and add AM. That gives 1:00 AM. Every military time from 0100 to 0959 converts this way, which is why the leading zero matters: it tells you the time is before 1000 and before noon. To go back from 1:00 AM to military time, put the zero in front again and drop the AM: 0100.
How to say 0100
0100 is said "zero one hundred". The hour is read as "zero one", with the zero spoken aloud, and the 00 minutes become "hundred", which is why on-the-hour times sound like round numbers. You will hear "zero one hundred hours" too; the word is common in speech, though Army correspondence rules (AR 25-50, paragraph 1-26) leave it out in writing.
Hours from 0100 to common times
Timesheets ask this more than anything else: how long is it from 0100 to the end of the day, or from the start of a shift to 0100? The table counts the time in the natural direction, from the earlier time to the later one, and gives decimal hours for payroll.
| Between | Hours and minutes | Decimal hours |
|---|---|---|
| From 0000 (midnight, start of the day) to 0100 | 1 hour | 1 |
| From 0100 to 0900 | 8 hours | 8 |
| From 0100 to 1200 (noon) | 11 hours | 11 |
| From 0100 to 1700 | 16 hours | 16 |
| From 0100 to 2400 (midnight, end of the day) | 23 hours | 23 |
Open the converter with 0100 filled in
Times near 0100
The quarter hours of the hour before, the hour itself and the hour after, so you can read off a time a few minutes either side of 0100 without converting again.
| Military time | 24-hour clock | Standard time | Said aloud |
|---|---|---|---|
| 0000 | 00:00 | 12:00 AM | zero zero hundred |
| 0015 | 00:15 | 12:15 AM | zero zero fifteen |
| 0030 | 00:30 | 12:30 AM | zero zero thirty |
| 0045 | 00:45 | 12:45 AM | zero zero forty-five |
| 0100 | 01:00 | 1:00 AM | zero one hundred |
| 0115 | 01:15 | 1:15 AM | zero one fifteen |
| 0130 | 01:30 | 1:30 AM | zero one thirty |
| 0145 | 01:45 | 1:45 AM | zero one forty-five |
| 0200 | 02:00 | 2:00 AM | zero two hundred |
| 0215 | 02:15 | 2:15 AM | zero two fifteen |
| 0230 | 02:30 | 2:30 AM | zero two thirty |
| 0245 | 02:45 | 2:45 AM | zero two forty-five |
Is 0100 morning, afternoon, evening or night?
0100 is in the small hours of the night. It is 1 hour after midnight and 11 hours before noon, the part of the day when a night shift is at its quietest. On the 12-hour clock it is 1:00 AM, and the AM is the clue: the date has already changed, even though most people are still asleep.
Questions people ask
What time is 0100 in military time?
0100 is 1:00 AM, one o'clock in the morning. Any military time before 1200 keeps its hour, so you only take off the leading zero and add AM.
How do you say 0100 in military time?
"Zero one hundred". On the hour the two zero minutes are read as "hundred", and the leading zero of the hour is spoken as "zero". In conversation people often add "hours" at the end.
Is 0100 AM or PM?
AM. Every military time from 0000 to 1159 is AM, and 0100 is 11 hours before noon. Military time never uses the letters, which is the point of it: 0100 can only mean one moment in the day.
How many hours is it from 0100 to midnight?
23 hours exactly, counting to 2400 at the end of the day. From 0100 to 1700 is 16 hours. The converter works out the time between any two military times, including across midnight.