Military Time Converter & 24-Hour Time Card Calculator

What Is Military Time?

Military time is a 24-hour clock that counts the hours of the day from 0000 to 2359, with no AM or PM.The day starts at 0000 (midnight), reaches 1200 at noon and ends at 2359, one minute before the next midnight.

Military time always uses four digits. The first two digits are the hour, from 00 to 23, and the last two digits are the minutes, from 00 to 59. There is no colon: 9:30 AM is 0930 and 5:34 PM is 1734.

The 24-hour clock is the international standard for writing times. ISO 8601 writes 6:30 PM as 18:30, the same hour and minutes as 1830 in military time. Most countries outside the United States (U.S.) use the 24-hour clock in daily life, and the U.S. reserves it for the military, healthcare, aviation and emergency services.

5 military time examples cover the whole day:

• 0000 = 12:00 AM, midnight at the start of the day
• 0930 = 9:30 AM
• 1200 = 12:00 PM, noon
• 1734 = 5:34 PM
• 2359 = 11:59 PM, one minute before midnight

Military Time vs. Standard Time

The main difference between military time and standard time is how the hours are counted. Standard time, the 12-hour clock, counts from 1 to 12 twice a day and adds AM (midnight to noon) or PM (noon to midnight). Military time counts the hours once, from 00 to 23, so the number alone shows the time of day.

4 rules separate the two formats:

1. Military time always uses four digits, such as 0700 instead of 7:00.
2. Morning hours keep the same number: 0800 is 8:00 AM.
3. Afternoon and evening hours add 12: 7:00 PM is 1900.
4. Military time drops AM and PM: the four-digit number shows the time of day.

How to Convert Military Time

To convert military time, read the first two digits. The first two digits decide whether the time is AM or PM and whether 12 is added or subtracted. The two methods below cover every time from 0000 to 2359.

Military Time to Standard Time

To convert military time to standard time, insert a colon after the first two digits and adjust the hour with 4 rules:

• 0000 to 0059: change the hour to 12 and add AM. 0045 is 12:45 AM.
• 0100 to 1159: remove the leading zero and add AM. 0930 is 9:30 AM.
• 1200 to 1259: keep the hour and add PM. 1215 is 12:15 PM.
• 1300 to 2359: subtract 12 from the hour and add PM. 1734 is 17 − 12 = 5, so 5:34 PM.

Example: 1830 → 18:30 → 18 − 12 = 6 → 6:30 PM.

To convert military time in Excel or Google Sheets, store the four digits as a number in cell A2 and use=TEXT(TIMEVALUE(TEXT(A2,"00\:00")),"h:mm AM/PM"). The formula turns 1830 into 6:30 PM.

Standard Time to Military Time

To convert standard time to military time, remove the colon, write four digits and adjust the hour with 5 rules:

• 12:00 AM to 12:59 AM: replace 12 with 00. 12:34 AM is 0034.
• 1:00 AM to 9:59 AM: add a leading zero. 7:00 AM is 0700.
• 10:00 AM to 11:59 AM: keep the hour. 11:55 AM is 1155.
• 12:00 PM to 12:59 PM: keep the hour. 12:20 PM is 1220.
• 1:00 PM to 11:59 PM: add 12 to the hour. 3:45 PM is 3 + 12 = 15, so 1545.

Example: 6:30 PM → 6 + 12 = 18 → 1830.

In Excel or Google Sheets, a time value in cell A2 converts to military time with =TEXT(A2,"hhmm"). The formula turns 6:30 PM into 1830.

Military Time Pronunciation Guide

Say military time as the hour, then the minutes, then the word “hours.” Times on the hour use “hundred”: 1300 is “thirteen hundred hours.” Times before 1000 start with “zero,” and casual speech often replaces “zero” with “oh.”

Radio operators and formal military settings use the full form with “hours.” Everyday speech drops the word: “eighteen thirty” means 1830.

Who Uses Military Time?

8 groups use military time every day:

• Military: the U.S. armed forces write orders, watch rotations and field exercises in 24-hour time.
• Emergency services: police, fire and emergency medical services (EMS) record calls in dispatch logs with 24-hour timestamps.
• Aviation: pilots and air traffic controllers use 24-hour time in Coordinated Universal Time (UTC), called Zulu time.
• Healthcare: hospitals chart medication doses and vital signs in 24-hour time. Nursing math references on the National Center for Biotechnology Information (NCBI) Bookshelf at ncbi.nlm.nih.gov include a military time conversion chart.
• Logistics: warehouses, trucking dispatchers and shipping crews log pickups, deliveries and driver hours on the 24-hour clock.
• Maritime: ship crews stand 4-hour watches, such as the middle watch from 0000 to 0400.
• Transit: rail and bus timetables in most countries print departures in 24-hour notation.
• Computing: servers write system logs and ISO 8601 timestamps in 24-hour time.

Why Night Work Is Logged in 24-Hour Time

Night work is logged in 24-hour time for 3 reasons: a shift that crosses midnight changes the date, 12 AM and 12 PM are easy to confuse, and 24-hour times subtract without AM/PM conversion.

The National Institute of Standards and Technology (NIST) states that the labels 12 a.m. and 12 p.m. are ambiguous. Military time gives midnight two clear forms: 0000 starts a day and 2400 ends it, so Friday 2400 and Saturday 0000 are the same moment.

To calculate a night shift in military time, add 24 hours to the end time, if the shift ends after midnight:

1. Shift: 2200 to 0630. The end, 0630, is earlier than the start, so the shift ends the next day.
2. Add 24 hours to the end: 06:30 + 24:00 = 30:30.
3. Subtract the start: 30:30 − 22:00 = 8 hours 30 minutes.
4. Convert to decimal hours: 30 minutes ÷ 60 = 0.5, so the shift is 8.5 hours (510 minutes).

Subtract hours and minutes separately. A day shift from 0830 to 1715 is 8 hours 45 minutes. Subtracting 830 from 1715 as plain numbers gives 885, which reads as 8 hours 85 minutes and is wrong: an hour has 60 minutes, not 100.