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0100 Military Time

Right now----:00(--:-- --)your device's clock

0100 is 1:00 AM, said oh one hundred hours.

Military time12h to 24h
Military time
Enter a time
Said
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24-hour
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Standard
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Minutes
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Military time chart
StandardMilitary
12:00 AM0000
1:00 AM0100
2:00 AM0200
3:00 AM0300
4:00 AM0400
5:00 AM0500
6:00 AM0600
7:00 AM0700
8:00 AM0800
9:00 AM0900
10:00 AM1000
11:00 AM1100
StandardMilitary
12:00 PM1200
1:00 PM1300
2:00 PM1400
3:00 PM1500
4:00 PM1600
5:00 PM1700
6:00 PM1800
7:00 PM1900
8:00 PM2000
9:00 PM2100
10:00 PM2200
11:00 PM2300

PM hours 1–11 add 12; 12 PM stays 12; 12 AM becomes 00. Four digits, no colon: 1730 is 5:30 PM.

The 0100 hour, every quarter

Military12-hourSaid as
01001:00 AMoh one hundred hours
01151:15 AMoh one fifteen
01301:30 AMoh one thirty
01451:45 AMoh one forty-five

What 0100 means on a shift

For most people 0100 is the middle of the night. For night shifts it is the middle of the working day: a 2300 to 0700 rotation is two hours in at 0100. Bars in many US cities call last orders around now, and taxi and delivery drivers are still on the clock. If you clocked in before midnight and are still working at 0100, your timesheet is already on the next date.

The mistake people make with 0100

1 AM and 1 PM are twelve hours apart but look alike in the 12-hour system. In military time they cannot be confused: 1 AM is 0100 and 1 PM is 1300. The mistake runs the other way: someone sees 0100 on a schedule and reads it as 1 PM because the one is what they notice. The leading zero is the tell. Any time that starts with 0 is morning, before noon.

0100 is 1:00 AM, the first full hour after midnight. The leading zero is not decorative: it keeps every time at four digits so that 0100 cannot be misread as 100 or confused with 1000. It is spoken as oh one hundred hours.

Worked examples

1:00 AM to military
0100. AM hours keep their number, padded to two digits: 01. Said oh one hundred hours.
1:20 AM to military
0120, said oh one twenty. The minutes carry across unchanged.
0100 to standard
1:00 AM. Hours 01 through 11 are AM and keep their number; just add the AM.

How it is calculated

1 AM is already an hour of the 24-hour clock, so it only needs a leading zero: 1:xx AM becomes 01xx. Back again, 01xx is 1:xx AM. No adding or subtracting twelve for any AM hour from 1 to 11.

Questions people ask

Is 0100 1 AM or 1 PM?
1 AM. The leading zero means the hour is before noon. 1 PM is 1300.
How do you say 0100 in military time?
Oh one hundred hours, or zero one hundred. Either is understood; oh one hundred is more common in American usage.
What is 0115 in regular time?
1:15 AM. The hour is 01 and the minutes stay 15.
Why does 0100 have a zero in front?
So every military time is four digits. 100 on its own could be a count or a typo. 0100 can only be a time.

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