What is military time?

Military time is a 24-hour clock system that runs from 0000 (midnight) to 2359 (11:59 PM). It eliminates the AM/PM ambiguity of the 12-hour clock. Hours and minutes are always written as four digits — for example, 9:00 AM is 0900 and 2:30 PM is 1430.

How do I convert military time to regular time?

For times from 0000 to 1159, remove leading zeros and add AM (0930 = 9:30 AM). For times from 1300 to 2359, subtract 12 and add PM (1800 − 1200 = 6:00 PM). Special cases: 0000 = 12:00 AM (midnight) and 1200 = 12:00 PM (noon).

What time is 1800 in regular time?

1800 in military time is 6:00 PM. Subtract 12 from the hour: 18 − 12 = 6. Since the result is between 13 and 23, it is PM. So 1800 = 6:00 PM. Spoken as "Eighteen hundred hours."

What time is 0000 in military time?

0000 is midnight — the very start of a new day. It is also written as 0000 hours and spoken as "Zero-zero-zero-zero hours" or informally "midnight." The last minute of a day is 2359 (11:59 PM).

Why do military and medical professionals use 24-hour time?

The 24-hour clock eliminates the AM/PM confusion that can occur with the 12-hour format. Misreading AM/PM in critical contexts — military orders, medication schedules, surgical timing, or aviation logs — can have serious consequences. The unambiguous 0000–2359 format removes that risk entirely.

What is 15:30 in regular time?

15:30 (or 1530) in military/24-hour time is 3:30 PM. Subtract 12: 15 − 12 = 3. Since 15 is between 13 and 23, it is PM. So 1530 = 3:30 PM, spoken as "Fifteen thirty hours."

How do you read 1430 in military time?

1430 is read as "Fourteen thirty hours." To convert: since 14 is greater than 12, subtract 12: 14 − 12 = 2, and it is PM. So 1430 = 2:30 PM. The digits are always spoken in pairs — "fourteen thirty" — rather than individually. No "AM" or "PM" is appended because the 24-hour format makes the time of day unambiguous.

What time is 0000 hours in military time?

0000 hours is midnight — the start of a new calendar day. It is spoken as "zero-zero-zero-zero hours" or informally as "midnight." The last moment of any day is 2359 (11:59 PM). Some contexts use 2400 to refer to the end of a day (equivalent to 0000 the next day), but military usage typically uses 0000 for the start of a new day rather than 2400.

Why do hospitals and airlines use 24-hour time?

In safety-critical environments, AM/PM ambiguity can be dangerous. A nurse misreading "6:00 PM" as "6:00 AM" on a medication schedule could administer a dose 12 hours late or early — potentially fatal for time-sensitive drugs. Airlines use UTC (Coordinated Universal Time) in 24-hour format for all schedules to avoid confusion across time zones. Military communications use it because orders, navigation, and mission timing must be exact. The 24-hour format eliminates the entire class of AM/PM errors.

Military Time Calculator — 12-Hour to 24-Hour

How to Use This Military Time Calculator

The military time calculator on this page converts between 12-hour AM/PM and 24-hour military time formats instantly. Choose your conversion direction using the toggle at the top, then select the hour, minute, and AM/PM (or enter a 4-digit military time). The result appears instantly in 4-digit format (e.g., 1430) along with its spoken form ("Fourteen thirty hours"). For working with elapsed time between two values, use the time duration calculator.

How to Convert 12-Hour Time to Military Time

The rules for converting from the standard 12-hour clock to 24-hour military time:

AM Hours (12:00 AM to 11:59 AM)

12:00 AM (midnight) → 0000
1:00 AM to 9:59 AM → Add a leading zero: 1:00 AM = 0100, 9:30 AM = 0930
10:00 AM to 11:59 AM → Same digits, no change: 10:00 AM = 1000, 11:30 AM = 1130
12:00 PM (noon) → 1200

PM Hours (12:01 PM to 11:59 PM)

1:00 PM to 11:59 PM → Add 12 to the hour: 1:00 PM = 1300, 6:30 PM = 1830, 11:59 PM = 2359

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Military Time Conversion Chart

Common reference times in both formats:

12:00 AM = 0000 — Midnight
6:00 AM = 0600 — Zero Six Hundred Hours
8:00 AM = 0800 — Zero Eight Hundred Hours
12:00 PM = 1200 — Noon / Twelve Hundred Hours
2:00 PM = 1400 — Fourteen Hundred Hours
4:30 PM = 1630 — Sixteen Thirty Hours
6:00 PM = 1800 — Eighteen Hundred Hours
8:00 PM = 2000 — Twenty Hundred Hours
10:00 PM = 2200 — Twenty-Two Hundred Hours
11:59 PM = 2359 — Twenty-Three Fifty-Nine Hours

How Military Time Is Spoken

Military time is spoken digit by digit, using a specific phonetic system where the digit 9 is pronounced "Niner" (to distinguish it from "nine" over radio communications). Examples:

0600 — "Zero Six Hundred Hours"
0930 — "Zero Niner Thirty Hours"
1200 — "Twelve Hundred Hours"
1430 — "Fourteen Thirty Hours"
1945 — "Nineteen Forty-Five Hours"
2359 — "Twenty-Three Fifty-Niner Hours"

When the minutes are 00, the time is spoken as "Hundred Hours" (e.g., 1800 = "Eighteen Hundred Hours").

Who Uses Military Time?

Military time is used in contexts where precision and clarity are critical:

Military — all branches of the US armed forces, NATO, and most world militaries
Medical — hospitals, emergency services, and pharmacies use 24-hour time to prevent AM/PM medication errors
Aviation — commercial aviation uses UTC (Coordinated Universal Time) in 24-hour format
Transportation — railroads and transit systems in most of the world (Europe, Asia, Latin America) use 24-hour timetables
Computing — system logs, timestamps, and ISO 8601 date formats all use 24-hour time

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Military Time vs. 24-Hour Time

Technically, "military time" and "24-hour time" refer to the same numerical format — both run from 0000 to 2359. The differences are in notation and speech. In civilian 24-hour time (used in Europe and most of the world), times are written with a colon: 14:30. In strict military notation, the colon is omitted (1430) and times are spoken using the digit-by-digit phonetic system. For everyday use and this calculator, the terms are interchangeable. When coordinating across regions, our time zone converter lets you map a military time in one zone to the equivalent local time anywhere in the world.

Sources & References

DoD Joint Publication 1-02: Military Time — U.S. Department of Defense
NIST Time and Frequency Division — National Institute of Standards and Technology

Military Time Calculator

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