How do I convert 24-hour time to 12-hour AM/PM?

For 24-hour times from 00:00 to 11:59, add AM (with midnight 00:xx becoming 12:xx AM). For 12:00 to 12:59, it's PM. For 13:00 to 23:59, subtract 12 from the hour and add PM: 13:00 → 1:00 PM, 18:30 → 6:30 PM, 22:45 → 10:45 PM.

24-Hour to 12-Hour Converter

Q: What is 13:00 in 12-hour format?

13:00 in 24-hour format is 1:00 PM in 12-hour format. Subtract 12 from hours above 12: 13 − 12 = 1, so 13:00 = 1:00 PM.

Q: What is 00:00 in 12-hour format?

00:00 in 24-hour format is 12:00 AM (midnight) in 12-hour format. This is the most commonly confused conversion: 00:00 = midnight = 12:00 AM, not 12:00 PM. 12:00 in 24-hour format is noon = 12:00 PM.

Q: What is 18:30 in 12-hour format?

18:30 is 6:30 PM. Subtract 12 from the hour: 18 − 12 = 6. So 18:30 = 6:30 PM.

Q: Which countries use 24-hour time?

Most of the world uses or officially recognises the 24-hour clock. It is the standard in Europe, Latin America, Asia, Africa, and Australia for official purposes (transport, military, medicine, computing). The US, Canada, UK, India, and some other countries commonly use 12-hour format in everyday speech, though 24-hour is used in aviation, military, computing, and healthcare in those countries too.

Convert any 24-hour clock time to 12-hour AM/PM format instantly. Includes a full reference chart for all hours and half-hours.

24-Hour Time

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1:30 PM

afternoon

Current 24-Hr

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Current 12-Hr

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Complete 24-Hour to 12-Hour Chart

The chart below covers every hour and half-hour of the day.

How the 24-Hour Clock Works

The 24-hour clock (also called "military time" in the US or simply the standard clock in most of the world) runs from 00:00 at midnight through 23:59 at one minute before midnight the following day. There is no AM or PM — each time of day has exactly one representation. This unambiguity is why medicine, aviation, computing, and military operations worldwide use 24-hour notation.

The conversion rules are simple but have two potential trip-ups — midnight and noon:

00:00 = 12:00 AM (midnight) — not 12:00 PM
12:00 = 12:00 PM (noon) — not 12:00 AM
00:01–11:59 = 12:01–11:59 AM (for 00:xx, replace 00 with 12)
12:01–23:59 = 12:01 PM–11:59 PM (subtract 12 from hours above 12)

The Midnight / Noon Edge Cases

The most frequent source of confusion is the 12-hour system's treatment of noon and midnight. In the 24-hour system, 00:00 is clearly midnight (start of day) and 12:00 is clearly noon. The 12-hour AM/PM system introduces ambiguity: both midnight and noon share the "12" label, distinguished only by the AM/PM suffix. Midnight is 12:00 AM and noon is 12:00 PM — which seems counterintuitive because "AM" typically means before noon (ante meridiem), yet midnight (12:00 AM) technically occurs at the boundary.

For scheduling software and APIs, it is safer to always use ISO 8601 24-hour format (e.g., 2026-02-25T14:30:00) to avoid any ambiguity caused by AM/PM interpretation differences.

Countries and the 24-Hour Clock

Most of the world uses the 24-hour clock in official contexts. In Europe, transportation schedules, official documents, and digital devices default to 24-hour. In Latin America, the 24-hour system is widely used in formal settings. In Asia, Japan uses both systems contextually; China, Korea, and most of Southeast Asia commonly use 24-hour in official schedules. The United States and Canada are among the few countries where 12-hour AM/PM is dominant in everyday speech, though 24-hour is standard in the military, aviation, medicine, and computing.

Frequently Asked Questions

How do I convert 24-hour time to AM/PM?

Hours 00–11: AM (replace 00 with 12 for midnight hour). Hour 12: PM. Hours 13–23: subtract 12, add PM. Examples: 09:00 = 9:00 AM, 12:00 = 12:00 PM (noon), 13:00 = 1:00 PM, 22:30 = 10:30 PM.

What is 13:00 in 12-hour format?

13:00 = 1:00 PM. Subtract 12: 13 − 12 = 1.

What is 00:00 in 12-hour format?

00:00 = 12:00 AM (midnight). Remember: midnight is 12 AM, not 12 PM.

What is 18:30 in 12-hour format?

18:30 = 6:30 PM. Subtract 12 from 18: 18 − 12 = 6.

Which countries use 24-hour time?

Most countries use 24-hour officially (Europe, Latin America, Asia, Africa, Australia). The US and Canada use 12-hour AM/PM in everyday speech but 24-hour in military, aviation, medicine, and computing.