How to Read Military Time: A Simple Conversion Guide
If you have ever looked at a boarding pass, hospital wristband, or train schedule and wondered whether 18:30 means morning or evening, this is for you. Military time -- also called 24-hour time -- is not complicated once you see the pattern.
The Basic Rule
Hours from midnight to noon are the same as on a 12-hour clock: 0100, 0200, ... 0900, 1000, 1100, 1200. The trick starts after noon: 1300 = 1 PM (subtract 12), 1400 = 2 PM, and so on until 2300 = 11 PM. 0000 = midnight.
Mental Shortcut
For any number above 1200, just subtract 12. That is it. 1700 becomes 5 PM. 2100 becomes 9 PM. 1530 becomes 3:30 PM.
Full Conversion Chart
| 24-Hour | 12-Hour | How to Say It |
|---|---|---|
| 0000 | 12:00 AM | Midnight |
| 0600 | 6:00 AM | Oh six hundred |
| 0900 | 9:00 AM | Oh nine hundred |
| 1200 | 12:00 PM | Twelve hundred |
| 1500 | 3:00 PM | Fifteen hundred |
| 1800 | 6:00 PM | Eighteen hundred |
| 2100 | 9:00 PM | Twenty-one hundred |
Who Uses It
Despite the name, military time everywhere is basically just the 24-hour clock. Most countries outside the US use it for daily life: Europe, Asia, Latin America. In the US, it is mainly military, hospitals, aviation, and emergency services.
The Tricky Ones
Midnight vs noon: 0000 is midnight, 1200 is noon. After midnight (12:01 AM) becomes 0001 in 24-hour time. In aviation and military contexts, you say "oh" for leading zeros: "0900" = "oh nine hundred."
Complete Conversion Chart (Every Hour)
| 24-Hour | 12-Hour | Spoken Form | 24-Hour | 12-Hour | Spoken Form |
|---|---|---|---|---|---|
| 0000 | 12:00 AM | Midnight | 1200 | 12:00 PM | Twelve hundred |
| 0100 | 1:00 AM | Oh one hundred | 1300 | 1:00 PM | Thirteen hundred |
| 0200 | 2:00 AM | Oh two hundred | 1400 | 2:00 PM | Fourteen hundred |
| 0300 | 3:00 AM | Oh three hundred | 1500 | 3:00 PM | Fifteen hundred |
| 0400 | 4:00 AM | Oh four hundred | 1600 | 4:00 PM | Sixteen hundred |
| 0500 | 5:00 AM | Oh five hundred | 1700 | 5:00 PM | Seventeen hundred |
| 0600 | 6:00 AM | Oh six hundred | 1800 | 6:00 PM | Eighteen hundred |
| 0700 | 7:00 AM | Oh seven hundred | 1900 | 7:00 PM | Nineteen hundred |
| 0800 | 8:00 AM | Oh eight hundred | 2000 | 8:00 PM | Twenty hundred |
| 0900 | 9:00 AM | Oh nine hundred | 2100 | 9:00 PM | Twenty-one hundred |
| 1000 | 10:00 AM | Ten hundred | 2200 | 10:00 PM | Twenty-two hundred |
| 1100 | 11:00 AM | Eleven hundred | 2300 | 11:00 PM | Twenty-three hundred |
Minutes and Seconds
Minutes are appended directly after the hours. 1430 = 2:30 PM. 0845 = 8:45 AM. 2359 = 11:59 PM. For times with minutes, you can say "fourteen thirty" or "fourteen thirty hours" in formal contexts.
Seconds work the same way: 143025 means 2:30:25 PM. In practice, most people drop seconds unless they're in aviation, computing, or scientific work.
Why the Military Uses 24-Hour Time
The core reason is eliminating ambiguity. In high-stakes environments -- combat, aviation, emergency response -- confusing 2 AM and 2 PM can be fatal. The 24-hour clock removes the need for AM/PM entirely. There's only one "0200" and one "1400."
The second reason is precision in documentation. Military logs, medical records, and incident reports all use 24-hour time to create an unambiguous timeline. When reconstructing events after an incident, there's no question about which shift a report refers to.
Who Uses 24-Hour Time Worldwide
The 24-hour clock is the official standard in most of the world:
- Europe: All countries use it for schedules, timetables, and official purposes. The UK uses it for railways and military but 12-hour in daily speech.
- Asia: Standard across China, Japan, Korea, India, and Southeast Asia.
- Latin America: Most countries use it for written schedules, though spoken language often mixes both.
- Africa: Widely used in official contexts across most countries.
- United States: Military, hospitals, aviation, emergency services, and some tech companies. General public uses 12-hour almost exclusively.
Common Mistakes When Converting
| Mistake | Why It's Wrong | Correct Version |
|---|---|---|
| Saying "2400" for midnight | 2400 is technically valid but 0000 is preferred | 0000 = midnight |
| Writing "12:00 AM" as "1200" | 1200 is noon, not midnight | 0000 = midnight, 1200 = noon |
| Adding 12 to morning hours | Only add 12 to PM hours (13-23) | 0900 stays 9 AM (no +12) |
| Forgetting leading zero | Military time always uses 4 digits | 0700 not 700 |
How to Set 24-Hour Time on Your Devices
iPhone: Settings → General → Date & Time → toggle "24-Hour Time" on.
Android: Settings → System → Date & Time → toggle "Use 24-hour format."
Windows: Settings → Time & Language → Regional Formats → change to HH:mm.
Mac: System Preferences → Language & Region → Advanced → set time format to HHmm.
Military Time in Computing
Most programming languages and databases store time internally as 24-hour format. Unix timestamps count seconds since January 1, 1970 at 00:00:00 UTC. When you see a log file entry like "2026-06-28 14:30:00 UTC," that's 24-hour time. Developers who work with logs, APIs, and databases use 24-hour time daily without thinking about it.
Frequently Asked Questions
Is military time the same as 24-hour time?
Yes. "Military time" is the American term for the 24-hour clock. The rest of the world just calls it "time."
How do you say 0000?
"Midnight" or "zero hundred." In aviation, "zero hundred hours."
What's 2400 vs 0000?
Both represent midnight. 0000 is the start of a new day; 2400 is sometimes used to mark the exact end of the previous day in schedules.
Do all militaries use the same format?
NATO militaries use the same 24-hour format with "Zulu time" (UTC) as the reference. A time written "1430Z" means 2:30 PM UTC.
Why doesn't the US just switch entirely?
Habit. The 12-hour clock is deeply embedded in American culture. Every other major country manages with 24-hour time in daily life -- but changing an entire country's habits is harder than changing its laws.