Military Time: Complete Guide (24-Hour Clock)

Military time is the 24-hour clock. It removes AM and PM by numbering the day from 0000 to 2359. The same system is used in many civilian settings too, especially in aviation, hospitals, and international scheduling.

This guide explains the format, quick conversion rules, a full chart, and the time zone letters you will often see in military communication.

What military time is

Military time uses four digits for hours and minutes:

• 0000 is the start of the day (midnight).
• 1200 is noon.
• 2359 is one minute before midnight.

You may also see 2400 used to mark the end of a day, especially in schedules. In most routine use, 0000 is more common than 2400.

How military time is written

Military time is usually written as four digits, without a colon:

• 0730 (seven thirty in the morning)
• 1545 (three forty-five in the afternoon)

Key formatting rules:

• Use leading zeros for times before 1000 (for example, 0815).
• Minutes always use two digits (for example, 0905 not 095).
• If seconds matter, they are added separately (for example, 143015).

Converting 12-hour time to military time

Use these rules to convert regular time to military time.

AM times

• 12:xx AM becomes 00xx (for example, 12:15 AM becomes 0015).
• 1:xx AM to 9:xx AM add a leading zero (for example, 7:05 AM becomes 0705).
• 10:xx AM and 11:xx AM stay the same (for example, 10:40 AM becomes 1040).

PM times

• 12:xx PM stays 12xx (for example, 12:30 PM becomes 1230).
• 1:xx PM to 11:xx PM add 12 to the hour (for example, 3:10 PM becomes 1510).

Converting military time to 12-hour time

Use these rules to convert from military time back to regular time.

• 0000 to 0059 is 12:xx AM (for example, 0030 is 12:30 AM).
• 0100 to 1159 is AM. Drop the leading zero if present.
• 1200 to 1259 is 12:xx PM.
• 1300 to 2359 is PM. Subtract 12 from the hour.

Military time conversion chart

This chart shows the hour conversions for quick reference.

Common examples

These examples show the most common conversions people need.

How to say military time out loud

Different units have slightly different habits, but these patterns are common:

• 0600 is said as “zero six hundred.”
• 0930 is said as “zero nine thirty.”
• 1200 is said as “twelve hundred.”
• 1545 is said as “fifteen forty-five.”
• 2100 is said as “twenty-one hundred.”

Minutes are spoken as two digits. For example, 0905 is often said as “zero nine zero five.”

Military time zones (Zulu and the letter system)

In operational settings, you will often see a letter added to show the time zone. Zulu (Z) is the most common. It means UTC (offset 0).

The military also uses letters for other UTC offsets. J is reserved for local time and changes depending on where the unit is located.

Daylight saving time can change the local UTC offset. That is one reason many operational messages use Zulu time.

Common mistakes to avoid

These are the errors that cause most confusion:

• Mixing up 12:00 AM and 12:00 PM
• Dropping leading zeros (for example, writing 815 instead of 0815)
• Using 2400 and 0000 without clarifying whether you mean the start or the end of the day
• Saying “1800 PM” or writing “1800 PM” (military time does not use AM or PM)

Wrap-up

Military time is a clear way to write and speak time without AM and PM. Once you memorize the key anchors (0000, 1200, and 1300), most conversions become quick.

If you are preparing for military service, military time is one of the simplest habits to build early, and it helps in training environments where schedules move fast.

You may also be interested in learning about What is Liberty in the Navy? for understanding how time off works, and Navy PQS (Personnel Qualification Standards) for watchstanding schedules that use military time.