Why is it called military time?

The 24-hour clock has been standard in militaries worldwide since World War I to prevent timing errors in operations. While civilians in many countries (especially in Europe) use the 24-hour format daily, in North America it is primarily associated with the military.

Is 2400 or 0000 correct for midnight?

Both are used in different contexts. 0000 indicates the start of a new day, while 2400 indicates the end of the current day. The military typically uses 0000 for the start and avoids 2400. Aviation uses both depending on context.

How do I say military time aloud?

Read each digit pair: 0800 is 'oh-eight-hundred,' 1430 is 'fourteen-thirty,' 0015 is 'zero-zero-fifteen.' When minutes are zero, say 'hundred': 1300 is 'thirteen hundred hours.'

Do all countries use 24-hour time?

Most countries use the 24-hour format as the standard or alongside the 12-hour format. The 12-hour AM/PM system is predominantly used in the United States, Canada, Australia, and a few other countries for everyday civilian use.

How does military time handle seconds?

When precision is needed, seconds are appended after a colon or directly: 14:30:00 or 143000. In most military and aviation contexts, time is expressed to the minute only.

Military Time Converter

Convert between 12-hour (AM/PM) and 24-hour military time

Military Time Converter

Convert between 12-hour and 24-hour time

Enter time in 24-hour format

24-hour Time (HH:MM)

Formula

12hr = 24hr mod 12 (0 becomes 12), AM if < 12, PM if >= 12

What Is Military Time?

Military time — also called the 24-hour clock — expresses time from 0000 (midnight) to 2359 (11:59 PM), completely eliminating the AM/PM ambiguity that can cause dangerous misunderstandings. It's the standard in the military, aviation, hospitals, emergency services, and most countries outside the United States. The format is always four digits — hours followed by minutes — with no colon in strict military notation.

Converting between 12-hour and 24-hour time is straightforward once you know the rules: AM hours stay the same (except midnight, which becomes 0000), and PM hours get 12 added to them (except noon, which stays 1200). This converter handles both directions instantly — just enter the time and get your answer.

How to Use the Military Time Converter

Enter a 12-hour time (e.g., 3:45 PM) or a military time (e.g., 1545) in the input field.
Select the conversion direction — 12-hour to military, or military to 12-hour.
Click Convert to calculate the result.
Read the equivalent time in the other format, displayed clearly below.

Conversion Formula & Reference

12-hour to 24-hour (military):
  AM hours (12:00 AM → 0:00 AM):
    12:xx AM → 00:xx
    1–11 AM  → same
  PM hours:
    12:xx PM → 12:xx
    1–11 PM  → hour + 12

24-hour to 12-hour:
  00:xx → 12:xx AM
  01–11 → same AM
  12:xx → 12:xx PM
  13–23 → hour − 12 PM

Common times:
  Midnight = 0000,  Noon = 1200
  3:30 PM  = 1530,  9:15 PM = 2115

Military time is written without a colon (1530, not 15:30) and often spoken as "fifteen thirty" or "fifteen hundred." Aviation uses Zulu time (UTC) with a Z suffix — for example, 1530Z means 3:30 PM UTC, regardless of local time zone.

Conversion Examples

9:00 AM = 0900

Morning AM hours are the simplest — just drop the colon and pad to four digits. 9:00 AM becomes 0900 (spoken "zero nine hundred").

3:30 PM = 1530

For PM hours after noon, add 12 to the hour. 3 + 12 = 15, so 3:30 PM becomes 1530 (spoken "fifteen thirty").

11:59 PM = 2359

The last minute of the day in military time is 2359. One minute later rolls over to 0000 — the start of a new day.

Frequently Asked Questions

Why does midnight cause confusion — is it 0000 or 2400?▾

Midnight can technically be written as either 0000 (start of a day) or 2400 (end of a day). In practice, the military and most standards use 0000 to mark the beginning of a new day, while 2400 is rarely used. To avoid any ambiguity, always say or write 0000 when you mean midnight.

What is Zulu time and how does it relate to military time?▾

Zulu time is the military and aviation term for Coordinated Universal Time (UTC). The letter Z ("Zulu" in the NATO alphabet) is appended to a 24-hour time to indicate UTC. For example, 1530Z means 15:30 UTC. This eliminates time-zone confusion in international operations — everyone refers to the same clock.

Why does the United States use the 12-hour clock instead of 24-hour time?▾

The 12-hour AM/PM system was inherited from British colonial usage and became deeply embedded in everyday American culture before any standardization push. While the US military, aviation, meteorology, and healthcare switched to 24-hour time for precision, the civilian population never made the shift. Most other countries, especially in Europe and Latin America, default to the 24-hour format in formal contexts.

Is military time actually faster to read than 12-hour time?▾

For trained users, yes. Military time removes the need to mentally process "AM" or "PM," which reduces cognitive load under stress. Studies on hospital shift handoffs show that using 24-hour notation measurably reduces medication timing errors. For everyday civilian use, familiarity matters most — people read whichever format they grew up with faster.

Which countries use the 24-hour clock as the standard?▾

The vast majority of the world uses the 24-hour clock in official, medical, transportation, and military contexts — including all of Europe, Latin America, Asia, Africa, and Australia. The 12-hour clock for everyday civilian use is most common in the United States, Canada, Australia, the UK, India, and a handful of other countries with strong British-influenced traditions.