Getting confused whether that 3:00 meeting is morning or afternoon? Missing appointments because you mixed up AM and PM? This 24 hour time chart eliminates the guesswork by showing you exactly how every 12-hour time converts to 24-hour format. Whether you’re a someone learning military time, a healthcare worker coordinating shifts, or someone working with international teams, you need a reliable military time chart that gives you instant answers. No more mental math or wondering if 18:00 means 6 PM, just find your time and see the conversion immediately.
Also, try our 24 Hour Clock Converter
12 to 24 Hour Time Chart
Military Time Chart
12-Hour to 24-Hour Clock Conversion Chart
| 12-Hour | 24-Hour | 12-Hour | 24-Hour |
|---|---|---|---|
| 12:00 AM | 0000 | 12:00 PM | 1200 |
| 1:00 AM | 0100 | 1:00 PM | 1300 |
| 2:00 AM | 0200 | 2:00 PM | 1400 |
| 3:00 AM | 0300 | 3:00 PM | 1500 |
| 4:00 AM | 0400 | 4:00 PM | 1600 |
| 5:00 AM | 0500 | 5:00 PM | 1700 |
| 6:00 AM | 0600 | 6:00 PM | 1800 |
| 7:00 AM | 0700 | 7:00 PM | 1900 |
| 8:00 AM | 0800 | 8:00 PM | 2000 |
| 9:00 AM | 0900 | 9:00 PM | 2100 |
| 10:00 AM | 1000 | 10:00 PM | 2200 |
| 11:00 AM | 1100 | 11:00 PM | 2300 |
24-Hour Time Chart
Download our printable 12-hour to 24-hour conversion chart. Ideal for healthcare, aviation, and international teams.
Download PDFAlso, try our Decimal Time Converter .
What Is 24-Hour Time?
The 24-hour clock is a timekeeping system that counts all 24 hours of the day sequentially, from 0000 (midnight) through 2359 (11:59 PM). Unlike the 12-hour AM/PM format, no hour repeats, eliminating confusion between morning and evening times.
The format uses four digits:
- First two digits: the hour (00–23)
- Last two digits: the minutes (00–59)
For example:
- 0730 = 7:30 AM
- 1200 = 12:00 PM (noon)
- 1845 = 6:45 PM
- 2315 = 11:15 PM
The day begins at 0000 (midnight) and the final minute is 2359. When the clock reaches 2359, the next minute is 0000 of the following day.
This system is the international standard for aviation, rail transport, medical documentation, computing, and military operations, anywhere precision and clarity are non-negotiable.
How to Convert 24-Hour Time
Converting 24-Hour Time to 12-Hour Time
For hours 0000 to 1159 (AM hours): Read the time directly and add “AM.” Add a leading zero context if needed.
- 0600 → 6:00 AM
- 0945 → 9:45 AM
- 1130 → 11:30 AM
Special case — Midnight:
- 0000 → 12:00 AM
For hours 1200 to 2359 (PM hours): Subtract 1200 from the time to get the PM equivalent.
- 1200 → 12:00 PM (no subtraction needed for noon)
- 1400 → 1400 – 1200 = 2:00 PM
- 1730 → 1730 – 1200 = 5:30 PM
- 2245 → 2245 – 1200 = 10:45 PM
Converting 12-Hour Time to 24-Hour Time
For AM times (12:01 AM to 11:59 AM): Remove the colon and “AM.” Ensure four digits by adding a leading zero when necessary.
- 7:15 AM → 0715
- 11:45 AM → 1145
Special case — Midnight:
- 12:00 AM → 0000
- 12:30 AM → 0030
For PM times (12:01 PM to 11:59 PM): Add 1200 to the time (add 12 to the hour).
- 12:00 PM → 1200 (noon stays as-is)
- 3:00 PM → 3 + 12 = 15 → 1500
- 8:20 PM → 8 + 12 = 20 → 2020
- 11:59 PM → 11 + 12 = 23 → 2359
How to Read and Pronounce 24-Hour Time
Pronunciation conventions vary slightly between civilian and military contexts, but the core principles are consistent.
Times on the Hour
| 24-Hour | Pronunciation |
|---|---|
| 0000 | “zero hundred” or “midnight” |
| 0700 | “zero seven hundred” |
| 1200 | “twelve hundred” or “noon” |
| 1500 | “fifteen hundred” |
| 2100 | “twenty-one hundred” |
Times with Minutes
| 24-Hour | Pronunciation |
|---|---|
| 0630 | “zero six thirty” |
| 0915 | “zero nine fifteen” |
| 1342 | “thirteen forty-two” |
| 1805 | “eighteen zero five” |
| 2350 | “twenty-three fifty” |
Key Rules
- Always use four digits. Say “zero nine hundred” for 0900, not “nine hundred.”
- Never say “thousand.” 1000 is “ten hundred,” not “one thousand.”
- Single-digit minutes use “zero.” 1405 is “fourteen zero five,” not “fourteen five.”
- In military and aviation contexts, add “hours” at the end: “zero eight hundred hours.”
- Zulu time (UTC) is indicated verbally: “fourteen thirty Zulu.”
Who Uses 24-Hour Time?
The 24-hour clock is standard practice in industries where timing errors carry significant consequences.
Aviation Pilots, air traffic controllers, flight dispatchers, and ground crews use 24-hour time exclusively. Flight plans, clearances, weather reports (METARs), and NOTAMs all reference time in this format—typically in UTC (Zulu time) to eliminate time zone confusion across international routes.
Healthcare Hospitals, clinics, and emergency services document patient records, medication administration, lab results, and shift schedules using the 24-hour format. Charting a medication given at 0200 versus 1400 is the difference between 2 AM and 2 PM—a potentially life-threatening distinction.
Military and Defense All branches of armed forces worldwide use 24-hour time for operations, logistics, communications, and record-keeping. Combined with military time zones (Alpha through Zulu), it enables precise coordination across global deployments.
Emergency Services Police, fire departments, and paramedics log dispatch times, incident reports, and response records in 24-hour format. Accurate timestamps are essential for accountability, legal documentation, and post-incident analysis.
International Business Companies operating across multiple time zones use the 24-hour format to avoid scheduling confusion. A meeting at 15:00 CET is unambiguous; “3:00” is not.
Transportation and Logistics Railways, shipping lines, and freight carriers schedule departures, arrivals, and cargo handling using the 24-hour clock. Timetables across Europe, Asia, and most of the world display times this way by default.
Computing and Technology Servers, databases, log files, and international software systems commonly use 24-hour time (often in ISO 8601 format: 2025-02-04T14:30:00) for consistency and sorting accuracy.
Scientific Research Laboratories, observatories, and research institutions use 24-hour time—often synchronized to UTC—for experiment logs, observations, and data recording.
Military Time vs. 24-Hour Time: Key Differences
“Military time” and “24-hour time” refer to the same underlying system, but there are formatting and contextual differences.
| Aspect | Military Time | 24-Hour Civilian Time |
|---|---|---|
| Colon usage | No colon (1430) | Includes colon (14:30) |
| Time zone notation | Letter suffix (1430Z, 0800R) | Written separately (14:30 UTC) |
| Spoken format | “Fourteen thirty hours” | “Fourteen thirty” |
| Primary users | Armed forces, defense agencies | Aviation, healthcare, Europe, Asia |
| Midnight notation | 0000 or 2400 | Typically 00:00 |
In practice: If you can read one, you can read the other. The difference is primarily stylistic—military communications omit the colon for brevity and add time zone letters for global coordination, while civilian 24-hour time includes the colon for readability.
History of 24-Hour Time
The concept of dividing the day into 24 segments dates back to ancient Egypt around 1500 BCE. Early Egyptians used sundials and star observations to track time, and evidence of 24-hour divisions appears on coffin lids from the 11th Dynasty in what historians call “Diagonal Star Tables.”
The Romans later adopted a 24-hour day, though their hours varied in length depending on the season (longer daylight hours in summer, shorter in winter). The fixed-length 24-hour system we use today became standard with the development of mechanical clocks in medieval Europe.
Modern military adoption:
- 1884: The International Meridian Conference established Greenwich as the prime meridian, laying the groundwork for standardized global time.
- 1920: The United States Navy officially adopted the 24-hour clock.
- 1942: The U.S. Army followed during World War II, driven by the need for unambiguous coordination in global operations.
- Post-WWII: NATO standardized 24-hour time and the military time zone system (Alpha through Zulu) for allied forces.
Today, most of the world uses the 24-hour format as the default for official and professional purposes. The 12-hour AM/PM system remains common primarily in the United States, Canada, Australia, and the Philippines for everyday civilian use.
24-Hour Time Zones
For global operations, the 24-hour clock is paired with a standardized time zone system. The military and aviation industries divide the world into 25 time zones, each identified by a letter of the NATO phonetic alphabet.
Common Time Zone Reference
| Letter | Name | UTC Offset | Example Regions |
|---|---|---|---|
| Z | Zulu | UTC ±0 | UK (winter), Iceland, Greenwich |
| A | Alpha | UTC +1 | Central Europe (winter) |
| B | Bravo | UTC +2 | Eastern Europe, Cairo |
| C | Charlie | UTC +3 | Moscow, Saudi Arabia |
| E | Echo | UTC +5 | Pakistan, Maldives |
| F | Foxtrot | UTC +6 | Bangladesh, Kazakhstan |
| I | India | UTC +9 | Japan, South Korea |
| K | Kilo | UTC +10 | Sydney (winter), Guam |
| M | Mike | UTC +12 | New Zealand (winter), Fiji |
| N | November | UTC -1 | Azores |
| R | Romeo | UTC -5 | U.S. Eastern (winter) |
| S | Sierra | UTC -6 | U.S. Central (winter) |
| T | Tango | UTC -7 | U.S. Mountain (winter) |
| U | Uniform | UTC -8 | U.S. Pacific (winter) |
| W | Whiskey | UTC -10 | Hawaii |
| J | Juliet | Local | Observer’s local time |
Key Zones Explained
Zulu (Z): The universal reference point, equivalent to Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT). All international aviation and most military operations reference Zulu time. A timestamp written as “1430Z” means 2:30 PM UTC, regardless of local time.
Juliet (J): Represents the local time zone of the person communicating. Used when local context is clear and UTC conversion isn’t necessary.
Written Format
In military and aviation communications, the time zone letter immediately follows the four-digit time:
- 0800Z = 8:00 AM UTC
- 1400R = 2:00 PM U.S. Eastern Time
- 2200I = 10:00 PM Japan Standard Time
Why the Military Uses 24-Hour Time
The military adopted the 24-hour clock for practical, operational reasons:
Eliminates AM/PM confusion In high-stress situations, distinguishing between 0600 and 1800 is instant and unambiguous. A mission briefing at 0430 cannot be mistaken for 4:30 PM. This clarity prevents errors in orders, logistics, and coordination that could have life-or-death consequences.
Enables global coordination Military operations span multiple continents and time zones. Combined with the Zulu time standard, 24-hour time provides a universal reference point. When a naval fleet in the Pacific and a command center in Virginia both reference 1400Z, there’s no confusion—regardless of local clocks.
Simplifies documentation Operation logs, after-action reports, intelligence summaries, and communications records all use timestamps. The 24-hour format ensures chronological consistency and eliminates the need to specify AM or PM in every entry.
Aligns with allied forces NATO and allied militaries worldwide use the same system, enabling seamless interoperability during joint operations. A British officer, American pilot, and German logistics coordinator all read “0730Z” identically.
Reduces radio traffic Omitting “AM,” “PM,” and colons shortens transmissions. In tactical communications where brevity matters, “zero six thirty” is faster than “six thirty in the morning.”
24-Hour Time Around the World
The 24-hour clock is the global standard for official, professional, and transportation contexts—though everyday usage varies by region.
Countries where 24-hour time is standard for daily use:
- Most of Europe (Germany, France, Spain, Italy, Scandinavia, Eastern Europe)
- Latin America (Brazil, Mexico, Argentina, Chile)
- Most of Asia (China, Japan, South Korea, India, Southeast Asia)
- Africa
- Middle East
- Russia and former Soviet states
Countries where 12-hour AM/PM is more common in daily life:
- United States
- Canada (though official use is 24-hour)
- Australia (mixed usage)
- Philippines
- United Kingdom (mixed—24-hour for transport/official, 12-hour conversationally)
Key regional notes:
- European Union: Timetables, official documents, and digital displays use 24-hour format by default.
- Japan: Uses 24-hour time extensively, including in broadcasting, where late-night programs might be listed as “25:00” or “26:00” (1:00 AM or 2:00 AM the next day).
- Canada: Official government communications and transportation use 24-hour time; everyday speech typically uses 12-hour.
- United Kingdom: Train and bus schedules use 24-hour time, but conversational use tends toward 12-hour with AM/PM.
Digital prevalence: Smartphones, computers, and international software increasingly default to or offer 24-hour time, driving broader familiarity even in countries where 12-hour time has been traditional.
Frequently Asked Questions
Is midnight 0000 or 2400?
Both are correct, but they have different uses. 0000 represents midnight as the start of a new day—use it when referencing the beginning of something (“The system goes live at 0000 on March 1”). 2400 represents midnight as the end of a day—use it for deadlines or closings (“Submissions accepted until 2400 on February 28”). In digital systems and most standard usage, 0000 is the default.
Does 24-hour time use a colon?
It depends on the context. Civilian 24-hour time (used in Europe, aviation, healthcare) typically includes the colon: 14:30. Military time omits the colon: 1430. Both represent the same time—the difference is formatting convention. Military format saves space and reduces potential misreading in handwritten communications.
What’s the difference between military time and 24-hour time?
They’re the same system with minor formatting differences. Military time omits the colon (1430 vs. 14:30) and often appends a time zone letter (1430Z). Civilian 24-hour time includes the colon and writes time zones separately. Functionally, if you can read one, you can read the other.
Do all military branches use the same time format?
Yes. The U.S. Army, Navy, Air Force, Marines, Coast Guard, and Space Force all use identical 24-hour time formatting. NATO allies also follow the same conventions, enabling seamless communication during joint and coalition operations.
Does the military observe Daylight Saving Time?
Local military installations observe Daylight Saving Time according to the laws of their location—a base in Arizona (no DST) operates differently than one in Texas (observes DST). However, operational planning and global coordination use Zulu time (UTC), which never changes for Daylight Saving. This provides a constant reference regardless of local clock adjustments.
Why doesn’t the U.S. use 24-hour time like other countries?
The 12-hour clock became culturally entrenched in American daily life before international standardization efforts. While U.S. military, aviation, healthcare, and computing industries use 24-hour time professionally, everyday American culture—clocks, schedules, conversation—defaults to AM/PM. There’s no technical reason; it’s simply convention.
How do I quickly convert PM times to 24-hour format?
Add 12 to the hour. 1 PM = 13:00, 5 PM = 17:00, 11 PM = 23:00. For times after noon, just remember: the 24-hour equivalent is always the PM hour plus 12.
What time is 0000?
0000 is 12:00 AM—midnight, the very beginning of a new day. It’s the moment the date changes. One minute later is 0001.
What time is 1200?
1200 is 12:00 PM—noon, the middle of the day. It’s the point where AM ends and PM begins in the 12-hour system.
How do I say 0005 in 24-hour time?
“Zero zero zero five” or “zero hundred zero five.” This represents 12:05 AM—five minutes after midnight.
Is 24-hour time more accurate than 12-hour time?
Not more accurate, but more precise in communication. Both systems measure time identically. The advantage of 24-hour time is that it eliminates ambiguity—there’s no need to specify AM or PM, reducing the chance of misinterpretation in critical contexts.
What does “Zulu time” mean?
Zulu time is another name for Coordinated Universal Time (UTC), the global time standard. “Zulu” comes from the NATO phonetic alphabet designation for the letter Z, which represents the UTC+0 time zone. When you see a time written as “1430Z,” it means 2:30 PM UTC.
How do airlines and airports display time?
Airports and airlines use 24-hour time for flight schedules, boarding passes, and operational communications. Departure boards typically show times like 14:35 or 06:20. Flight crews and air traffic control communicate in 24-hour format using Zulu time for coordination across time zones.
Do hospitals use military time or 24-hour time?
Healthcare facilities use 24-hour time (usually with the colon: 14:30) for patient charts, medication schedules, and shift documentation. It’s called “24-hour time” or simply “hospital time” in medical contexts rather than “military time,” though the format is essentially the same.