Time Format Converter
Convert between 12-hour (AM/PM) and 24-hour time formats instantly — no signup, works on any device.
12-Hour vs 24-Hour Time — What's the Difference?
The 12-hour clock splits the day into two cycles: AM (midnight to noon) and PM (noon to midnight). The 24-hour clock runs from 00:00 at midnight to 23:59 just before the next midnight — no AM/PM needed. Both describe the same moments in time, just with different notation.
The confusion usually hits at the edges. 12:00 AM is midnight — not noon. 12:00 PM is noon — not midnight. This trips up even people who use the 12-hour clock daily. In the 24-hour system, midnight is unambiguously 00:00 and noon is 12:00. No ambiguity.
Most of the world uses 24-hour time officially. The US, UK, Canada, and Australia use 12-hour time in everyday conversation, but switch to 24-hour time in aviation, healthcare, the military, and most transport systems — anywhere precision matters.
How to Convert Manually
12h to 24h: For AM times, the hour stays the same — except 12:xx AM becomes 00:xx. For PM times, add 12 to the hour — except 12:xx PM stays as 12:xx.
24h to 12h: Hours 00–11 are AM (00 becomes 12). Hours 12–23 are PM — subtract 12 from hours 13–23. 12:xx stays as 12:xx PM.
Military Time — How It Differs from 24-Hour
Military time is 24-hour time with specific formatting rules: no colon, always four digits, and a different verbal convention. 08:30 in standard 24-hour notation becomes 0830 in military time, spoken as "oh eight thirty." 14:00 becomes 1400, spoken as "fourteen hundred."
Used by the US military, NATO, police and emergency services, aviation (as Zulu time for UTC), and hospitals in many countries. The no-colon, no-AM/PM format eliminates any chance of a 2 AM vs 2 PM mix-up — critical when timing matters for operations, medication, or flight schedules.
If you work with military time regularly, the Military Time Converter includes a full 0000–2359 chart and pronunciation guide.
Common Conversion Mistakes to Avoid
12:00 AM vs 12:00 PM. This catches everyone at some point. 12:00 AM is midnight — the start of a new day. 12:00 PM is noon. If you think of AM as "after midnight" and PM as "past midday," the logic holds. In 24-hour time, midnight is 00:00 and noon is 12:00 — no ambiguity.
Forgetting that both zones change for daylight saving. If you're converting a time that was set in one timezone, make sure the DST status was the same when the time was recorded. A log entry from a server that doesn't adjust for DST will shift by an hour against local time twice a year.
Treating military time as a separate system. Military time is just 24-hour time without the colon and with leading zeros. 0830 and 08:30 describe the same moment. The only real difference is spoken convention — "oh eight thirty" vs "eight thirty."
Frequently Asked Questions
How do I convert 12-hour time to 24-hour time?
For AM times, the hour stays the same except for 12 AM which becomes 00:00. For PM times, add 12 to the hour (except for 12 PM which stays as 12:00). Examples: 1:30 AM → 01:30, 12:00 AM → 00:00, 2:45 PM → 14:45, 12:00 PM → 12:00.
How do I convert 24-hour time to 12-hour time?
For hours 00–11, use AM (and replace 00 with 12 for midnight). For hours 12–23, subtract 12 and use PM (hour 12 stays as 12 PM). Examples: 00:00 → 12:00 AM, 09:30 → 9:30 AM, 13:00 → 1:00 PM, 23:45 → 11:45 PM.
What is the difference between 12-hour and 24-hour time?
12-hour time splits the day into two 12-hour periods (AM and PM), with noon as 12:00 PM and midnight as 12:00 AM. 24-hour time runs from 00:00 (midnight) to 23:59, with no AM/PM needed. 24-hour time is used in aviation, military, medicine, and most of the world outside the US, UK, and Canada.
What is military time?
Military time is the 24-hour clock with no colon, written as four digits: 0800 (8 AM), 1430 (2:30 PM), 2359 (11:59 PM). The only difference from standard 24-hour notation is the formatting — no colon, always four digits, and spoken differently (e.g., "fourteen thirty" for 1430).
What time is 12:00 PM in 24-hour format?
12:00 PM (noon) is 12:00 in 24-hour format. This is one of the common confusion points — 12:00 PM does not become 00:00. Midnight is 00:00 (or 24:00 at the end of a day). Noon is 12:00.
Which countries use 24-hour time?
Most countries use 24-hour time in official and professional contexts — including continental Europe, most of Asia, Africa, and Latin America. The US, UK, Canada, Australia, and New Zealand predominantly use 12-hour time in everyday speech, though these countries use 24-hour time in aviation, healthcare, military, and transport.