0000 Military Time: What is Midnight in the 24-Hour Clock?
0000 military time is 12:00 AM, midnight. It’s the very first minute of a new day on the 24-hour clock, and it’s where every day technically begins.
If that’s all you needed, you’ve got it. But if you’ve also seen “2400” used for midnight somewhere and you’re not sure which one is correct, or you want to know how this is actually pronounced out loud, stick around, because this is one of the more confusing times to fully understand, even though the number itself looks simple. It also helps to first understand how to read military time, since midnight is one of the few exceptions to the military time conversion rule.
Military Time → Standard Time
Type a 4-digit military time (e.g. 1830)
Minute-by-Minute Chart (0000 to 0059)
If you need to convert a specific minute within this first hour, here’s the full breakdown.
| Military Time | Standard Time |
|---|---|
| 0000 | 12:00 AM |
| 0005 | 12:05 AM |
| 0010 | 12:10 AM |
| 0015 | 12:15 AM |
| 0020 | 12:20 AM |
| 0025 | 12:25 AM |
| 0030 | 12:30 AM |
| 0035 | 12:35 AM |
| 0040 | 12:40 AM |
| 0045 | 12:45 AM |
| 0050 | 12:50 AM |
| 0055 | 12:55 AM |
The pattern here is simple, the hour stays at zero the entire time, and the minutes just count up normally until the clock rolls over into 0100 (1:00 AM).
What is 0000 Military Time?
0000 is written as four digits, and both the hour and the minutes are zero. There’s no colon, no AM or PM, just four zeros sitting together. On a regular clock, that’s 12:00 AM, the exact moment one day ends and the next one begins.
You’ll notice something a little unusual here compared to every other hour on the clock. With most military times, you take the 24-hour number and either leave it as is or subtract 12, depending on whether it’s morning or afternoon. Midnight doesn’t really follow that pattern, it’s more of a reset point than a calculation.
So if you’re scanning a schedule and you see 0000, just read it as “the start of the day.” Nothing needs to be added or subtracted.
0000 vs 2400: Which One is Correct?
This is genuinely the part that trips people up the most, so let’s clear it up properly.
Technically, both 0000 and 2400 represent midnight. The difference isn’t in what time they mean, it’s in what they’re marking.
0000 is used to mark the beginning of a day. If you’re writing out a schedule and something starts right at midnight, you’d use 0000.
2400 is used to mark the end of a day. If an event or a shift wraps up exactly at midnight, some schedules will write that as 2400 instead, since it’s the final moment of the day that’s ending, rather than the first moment of the one beginning.
If you’re ever unsure which one to use, 0000 is the safer default. It’s more commonly used and it’s the version most digital systems, clocks, and devices default to automatically.
How to Pronounce 0000 Military Time?
- Out loud, 0000 is said as “zero hundred hours.” You might also hear it shortened to just “zero hundred” in more casual settings, like among shift workers or hospital staff who say it constantly and don’t need the formality.
- Technically, you could also read it digit by digit as “zero zero zero zero,” and you’ll occasionally hear that version too, especially in radio communication where every single digit gets spoken separately to avoid any chance of mishearing it. But “zero hundred hours” is by far the more common way you’ll actually hear it said.
- And if someone just says “midnight” instead, that works too. In casual conversation, nobody’s going to correct you for skipping the formal military phrasing.
0000 in Zulu Time (0000Z):
If you’ve come across “0000Z” somewhere, that’s referring to Zulu time, which is just another name for Coordinated Universal Time, or UTC. Zulu time doesn’t shift depending on where you are in the world, so 0000Z always represents the exact same global moment, midnight at the Prime Meridian in Greenwich, England.
You’ll mostly run into this in aviation, military coordination, or anywhere multiple countries need to agree on a single, unchanging reference point. If you want the full breakdown of how the letter-based time zone system works, including why Zulu specifically gets used this way, our military time zones guide covers it in detail.
Real-World Use: The Mid-Watch Shift
If you’ve ever heard someone in the military mention “mid-watch,” this is the hour it starts. The mid-watch typically runs from 0000 to 0400, and it’s historically considered one of the toughest shifts to work, mostly because it lines up with the body’s natural low point in alertness. Staying sharp during these hours takes real discipline, which is part of why this particular shift has such a distinct reputation among service members.
Outside the military, plenty of other fields run on a similar overnight rhythm, security patrols, 24-hour dispatch centers, and round-the-clock manufacturing lines all treat 0000 as the start of their night shift too.
Real-World Use: Hospital Date-Boundary Errors
Here’s a detail most people never think about until it actually causes a problem. In healthcare settings, 0000 marks the exact boundary between one calendar date and the next, and that boundary is a surprisingly common source of charting mistakes.
If a patient’s medication or vitals get logged a few minutes before or after midnight, a rushed or distracted entry can accidentally get filed under the wrong date. It sounds like a small thing, but in a hospital setting, a misdated record can genuinely affect how a patient’s care gets tracked. It’s part of why hospitals train staff so specifically on how to log times right around this hour.
Conclusion
0000 military time represents 12:00 AM (midnight) and marks the beginning of a new day on the 24-hour clock. While 2400 may appear in some schedules to indicate the end of a day, 0000 is the standard format used by most military organizations, hospitals, aviation systems, and digital devices.
Now that you’ve got 0000 down, the rest of the 24-hour clock follows a much simpler pattern. Check out 0100 military time to see how the very next hour works, or head back to the full military time chart for the complete picture.
Frequently Asked Questions
Summary
