Military Time Explained: How to Read and Convert 24-Hour Time

Military time — also known as the 24-hour clock — eliminates the confusion between AM and PM by counting hours from 0 to 23. Instead of resetting at noon like the 12-hour clock, military time continues counting: 1:00 PM becomes 1300, 6:30 PM becomes 1830, and midnight is either 0000 or 2400. This system is used by the military, hospitals, aviation, law enforcement, and most countries outside the United States. If you've ever been confused by a flight itinerary showing "15:45" or a medical chart noting "0200," this guide will make it second nature.

How the 24-Hour Clock Works

The 24-hour clock starts at 0000 (midnight) and counts up to 2359 (one minute before the next midnight). The first two digits represent the hour (00–23), and the last two represent minutes (00–59). There is no need for AM or PM because each hour of the day has a unique number.

From midnight to noon, military time and standard time are nearly identical. The key differences appear after 12:59 PM, when standard time resets to 1:00 while military time continues to 1300.

Complete Conversion Chart

Need a quick conversion? Use our military time converter to switch between formats instantly.

How to Convert Standard Time to Military Time

Converting to military time follows two simple rules:

AM Times (12:01 AM – 12:59 PM)

For times between 1:00 AM and 12:59 PM, simply remove the colon and the AM/PM label, then pad single-digit hours with a leading zero:

• 1:00 AM → 0100
• 7:30 AM → 0730
• 11:45 AM → 1145
• 12:00 PM (noon) → 1200

The one exception is 12:00 AM (midnight), which becomes 0000, not 1200. This is the most commonly confused conversion.

PM Times (1:00 PM – 11:59 PM)

For times from 1:00 PM onward, add 12 to the hour:

• 1:00 PM → 1 + 12 = 13 → 1300
• 3:45 PM → 3 + 12 = 15 → 1545
• 6:15 PM → 6 + 12 = 18 → 1815
• 11:59 PM → 11 + 12 = 23 → 2359

How to Convert Military Time to Standard Time

Going the other direction is just as straightforward:

• If the hour is 00: It's 12:XX AM (midnight hour)
• If the hour is 01–11: It's the same hour AM
• If the hour is 12: It's 12:XX PM (noon hour)
• If the hour is 13–23: Subtract 12 for the PM hour

Examples:

• 0000 → 12:00 AM (midnight)
• 0845 → 8:45 AM
• 1200 → 12:00 PM (noon)
• 1430 → 14 − 12 = 2 → 2:30 PM
• 2215 → 22 − 12 = 10 → 10:15 PM

How to Speak Military Time

In military and aviation contexts, times are spoken differently than you might expect:

• On the hour: State the four digits followed by "hours." 0800 is "zero eight hundred hours." 1500 is "fifteen hundred hours."
• With minutes: State each digit group. 0830 is "zero eight thirty." 1445 is "fourteen forty-five."
• With time zones: The military uses letter designations for time zones. UTC is "Zulu" (Z), so 0800Z means "zero eight hundred Zulu." Eastern time is "Romeo" (R), Pacific is "Uniform" (U).

In casual conversation, most people simply say the numbers: "Let's meet at fourteen hundred" or "The flight departs at twenty-one thirty."

Why Military Time Is Used

The primary advantage is zero ambiguity. With the 12-hour clock, "8:00" could mean morning or evening. A doctor scheduling medication "every 8 hours starting at 8" leaves room for dangerous misunderstandings. In military time, 0800 and 2000 are unambiguous.

Industries that rely on military time include:

• Military: Operations, logistics, and communication across time zones
• Healthcare: Medication schedules, shift handoffs, and medical records
• Aviation: All flight plans, air traffic control, and pilot communications
• Emergency services: Police, fire, and EMS dispatch logs
• International business: Most of Europe, Asia, and Latin America use 24-hour time in daily life

Military Time in Everyday Life

Even if you're not in the military, 24-hour time appears more often than you might realize. Digital clocks and phones often have a 24-hour option. European train and bus schedules use it exclusively. Many workplace time-tracking systems and work hours calculators accept or display 24-hour format because it simplifies calculating hours worked across AM/PM boundaries.

If you track your work hours on overnight shifts (like 10 PM to 6 AM), military time makes the math far easier: 2200 to 0600 is immediately recognizable as an 8-hour shift without worrying about date changes or AM/PM confusion.

Common Mistakes and How to Avoid Them

• Confusing 0000 and 2400: Both can represent midnight. 0000 is the start of a new day; 2400 is the end of the current day. In practice, 0000 is used far more commonly.
• Forgetting the leading zero: 1:00 AM is 0100, not 100. Always use four digits.
• Treating 1200 as midnight: 1200 is noon. Midnight is 0000.
• Adding 12 to AM times: Only add 12 to PM times (1:00 PM through 11:59 PM). AM times from 1:00 AM to 11:59 AM keep their original hour.

Practice with our military time converter. Enter any time in either format and see the conversion instantly.