When you ship out to Basic Training, there is more than just learning discipline and drill—you’ll also enter a whole new world of timekeeping! In the military, there’s no 9 to 5. Instead, it’s all about the 24-hour clock, better known as military time.
At first, it might look like a secret code—but don’t worry! We’re here to break it down so you can follow along like a seasoned pro.
Why Does the Military Use a 24-Hour Clock?
Because precision matters. When operations run 24/7, there’s no room for mix-ups between a.m. and p.m. That’s why military time is the standard across all branches of service.
Fun Fact: The U.S. Navy started using the 24-hour clock in 1920 after World War I, and the Army followed in 1942. Ever since, military time has been the go-to for clarity and consistency.
Military Time Made Easy
Here’s a quick-reference chart to help you convert military time at a glance:
| 12-Hour Time | Military Time | 12-Hour Time | Military Time |
| 12:00 a.m. | 0000 (Zero Hundred) | 12:00 p.m. | 1200 |
| 1:00 a.m. | 0100 | 1:00 p.m. | 1300 |
| 2:00 a.m. | 0200 | 2:00 p.m. | 1400 |
| 3:00 a.m. | 0300 | 3:00 p.m. | 1500 |
| 4:00 a.m. | 0400 | 4:00 p.m. | 1600 |
| 5:00 a.m. | 0500 | 5:00 p.m. | 1700 |
| 6:00 a.m. | 0600 | 6:00 p.m. | 1800 |
| 7:00 a.m. | 0700 | 7:00 p.m. | 1900 |
| 8:00 a.m. | 0800 | 8:00 p.m. | 2000 |
| 9:00 a.m. | 0900 | 9:00 p.m. | 2100 |
| 10:00 a.m. | 1000 | 10:00 p.m. | 2200 |
| 11:00 a.m. | 1100 | 11:00 p.m. | 2300 |
How to Read It Like a Soldier
Let’s demystify it:
- No a.m. or p.m. — Each hour stands on its own.
- Start at 0000 (pronounced “zero hundred hours”) for midnight.
- Add 100 for every hour after that (e.g., 1 a.m. = 0100, 2 a.m. = 0200).
- At noon, it’s 1200 hours.
- From 1 p.m. on, just add 12 to the civilian time. So 3 p.m. = 1500.
- Time is always written in four digits (e.g., 0630 = 6:30 a.m.).
Pro Tip: To convert any time after 1200, just subtract 12. So, 2000 hours – 12 = 8:00 p.m. Easy!
“O’ Dark Thirty” – The Start of a Trainee’s Day
You might hear someone say they woke up at “O’ Dark Thirty.” That’s military slang for the super-early hours—usually anywhere from midnight to 0500. It’s not just about early mornings—it’s about maximizing every moment of training and transformation.
From sunrise formations to late-night lessons, every second counts in their journey from civilian to Soldier. Military time helps keep you locked in, focused, and mission-ready—every hour of the day.
So now, when someone says they’ll see you around 2100 hours, you’ll know—that’s 9:00 p.m. sharp!
Welcome to the world of military time—you’ve got this! Hooah!
I’ll be back next week with more tips and guidance. Until then, Hooah!
SGM Kris Broadus, U.S. Army (Retired)
