24-Hour Clock Live & Converter
The 24-hour clock is a time format that numbers every hour of the day from 00:00 to 23:59 instead of repeating 1 through 12 twice with AM and PM. Each time has one unique number, so 3:00 PM becomes 15:00 and 11:00 PM becomes 23:00.
This format is often called military time and is widely used in hospitals, aviation, travel, public transport, and international schedules because it removes confusion between morning and evening times.
Instant Time Converter
Type any time (e.g., 7:30 PM, 19:45, or 1530) to instantly convert it.
12-Hour Clock
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24-Hour Clock
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Military Time
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Full Conversion Chart
Browse full hours below. Need an exact time like 7:45 PM? Use the converter above.
| 12-Hour | 24-Hour | Military |
|---|---|---|
| 12:00 AM | 00:00 | 0000 |
| 1:00 AM | 01:00 | 0100 |
| 2:00 AM | 02:00 | 0200 |
| 3:00 AM | 03:00 | 0300 |
| 4:00 AM | 04:00 | 0400 |
| 5:00 AM | 05:00 | 0500 |
| 12-Hour | 24-Hour | Military |
|---|---|---|
| 6:00 AM | 06:00 | 0600 |
| 7:00 AM | 07:00 | 0700 |
| 8:00 AM | 08:00 | 0800 |
| 9:00 AM | 09:00 | 0900 |
| 10:00 AM | 10:00 | 1000 |
| 11:00 AM | 11:00 | 1100 |
| 12-Hour | 24-Hour | Military |
|---|---|---|
| 12:00 PM | 12:00 | 1200 |
| 1:00 PM | 13:00 | 1300 |
| 2:00 PM | 14:00 | 1400 |
| 3:00 PM | 15:00 | 1500 |
| 4:00 PM | 16:00 | 1600 |
| 5:00 PM | 17:00 | 1700 |
| 12-Hour | 24-Hour | Military |
|---|---|---|
| 6:00 PM | 18:00 | 1800 |
| 7:00 PM | 19:00 | 1900 |
| 8:00 PM | 20:00 | 2000 |
| 9:00 PM | 21:00 | 2100 |
| 10:00 PM | 22:00 | 2200 |
| 11:00 PM | 23:00 | 2300 |
Download Printable Cheat Sheet
Perfect for hospitals, aviation, military, and classrooms.
Understanding the 24-Hour Clock Format
On a 12-hour clock, the day is split into two identical cycles of 1 to 12, and the only thing separating 7:00 in the morning from 7:00 at night is the AM or PM label sitting next to it. Drop that label, or mishear it over a phone call or a radio, and 7:00 AM and 7:00 PM become indistinguishable.
The 24-hour clock removes that ambiguity by counting straight through the day instead of resetting. The first 12 hours, from midnight to noon, look almost identical to the 12-hour clock minus the "AM" — 9:00 AM simply becomes 09:00. After noon, the count keeps climbing instead of starting over: 1:00 PM becomes 13:00, 7:00 PM becomes 19:00, and 11:00 PM becomes 23:00. Every hour of the day gets exactly one number, so there's no label to lose and no moment that can be misread.
How to Convert Between 12-Hour and 24-Hour Time
Converting 12-Hour to 24-Hour (The +12 Rule)
- From 1:00 AM to 11:59 AM: Simply remove the "AM". The time remains the same. (e.g., 9:30 AM → 09:30)
- From 1:00 PM to 11:59 PM: Add 12 to the hour and remove the "PM". (e.g., 3:45 PM + 12 hours = 15:45)
Converting 24-Hour to 12-Hour (Reversing the Rule)
- From 00:00 to 00:59: Change the hour to 12 and add AM. (e.g., 00:30 → 12:30 AM)
- From 01:00 to 11:59: Keep the hour as is and add AM. (e.g., 09:15 → 9:15 AM)
- At 12:00: Keep the hour as 12 and add PM — this is noon. (e.g., 12:00 → 12:00 PM)
- From 13:00 to 23:59: Subtract 12 from the hour and add PM. (e.g., 21:45 − 12 = 9:45 PM)
⚠️ The Midnight & Noon Trap
Noon and midnight are the only two times that don't follow the normal +12 rule, and that's exactly why they cause the most mistakes. On a 12-hour clock the count runs ...11, 12, 1, 2... — it never actually reaches a true zero. So the start and end of the day are forced to share the number 12, with only AM or PM to tell them apart. The 24-hour clock has an actual hour 0, and that hour is midnight.
- 👉 12:00 AM (Midnight) becomes 00:00 — the very start of the day.
- 👉 12:00 PM (Noon) becomes 12:00 — you do NOT add 12 to it, since it's already the 12th hour.
The one real wrinkle is 24:00. You'll occasionally see it on train timetables, legal contracts, or shift schedules to mean "the very last instant of this day," as opposed to 00:00, which means "the very first instant of the next day" — the choice tells you which day a document is referring to. Every digital clock and computer system, though, always displays that moment as 00:00, never 24:00 — so when you're typing a time into a form, 00:00 is always the safe answer.
Where the 24-Hour Clock Is Used — and Why
Military & Aviation
The armed forces and aviation industry use the 24-hour clock because coordinating across time zones can be a matter of safety. When a pilot over the Atlantic and a control tower are both reading off "1530 Zulu," there's no AM/PM to mistranslate across a five-hour time difference.
Medicine & Healthcare
Hospitals chart medications in 24-hour time for the same reason: a dose due at "08:00" and another at "20:00" can never be confused, even by an exhausted night-shift nurse glancing at a chart at 3 a.m. Mixing up AM and PM on a dosing schedule isn't a typo — it's a 12-hour error in patient care.
Travel & International Schedules
Airlines, railways, and transit systems worldwide print departure times in 24-hour format, because a traveler misreading "18:30" as "6:30 AM" misses a flight, not just a minor mix-up. Curious what time it actually is right now somewhere on your itinerary? Check our live world clock, use the timezone converter, or see the current UTC time to track global schedules.
How to Read 24-Hour Time Aloud
Military Time Pronunciation
In military and aviation contexts, the colon is removed and the time is read as a four-digit number.
- 0600 "Oh-six-hundred"
- 1530 "Fifteen-thirty"
- 0000 "Zero-hundred hours"
NATO Phonetic Time Zones
The military attaches a letter to the end of the time to indicate the time zone. The most famous is "Z".
"1530 Zulu" (1530Z)
Zulu refers to UTC (Coordinated Universal Time). It ensures that a pilot in New York and a tower in London are talking about the exact same moment.
Test Your Knowledge
Try this quick 5-question quiz to see if you've mastered the 24-hour clock!
What is 3:00 PM in 24-hour time?
What is 00:00 equivalent to on a 12-hour clock?
How do you write 8:45 AM in the 24-hour format?
If a flight leaves at 19:30, what time is that?
How do you pronounce '0800' in military time?
Frequently Asked Questions
What is the 24-hour clock?
The 24-hour clock is a time format that runs from 00:00 at midnight to 23:59, so each hour of the day has one unique number and does not need AM or PM.
How do you convert PM to 24-hour time?
For times from 1:00 PM to 11:59 PM, add 12 to the hour. For example, 7:30 PM becomes 19:30. 12:00 PM (noon) stays 12:00.
What is 12 AM in 24-hour time?
12:00 AM is midnight, which is written as 00:00 in standard 24-hour notation.
What is 12 PM in 24-hour time?
12:00 PM is noon, which stays 12:00 in 24-hour notation. You do not add 12 to it.
Is 24:00 the same as 00:00?
Many people use 24:00 to refer to the exact end of a day and 00:00 to refer to the start of a day. However, on digital clocks and computer systems, it is universally displayed as 00:00.