Military Time Converter
12-hour AM/PM to 24-hour military time and back — with full reference table
Quick answer: Add 12 to any PM time after noon: 3:00 PM = 1500. For AM: keep the same number, pad to 4 digits: 9:30 AM = 0930. Midnight = 0000, Noon = 1200.
Full 24-hour reference
24-Hour Clock Usage by Country and Sector
| Region / Sector | Standard | Notes |
|---|---|---|
| 🇪🇺 Continental Europe | 24-hour | Standard in Germany, France, Spain, Italy, Scandinavia |
| 🇬🇧 United Kingdom | Mixed | 12-hr in speech; 24-hr on transport, official docs |
| 🇺🇸 United States | 12-hour | Military uses 24-hr; civilian uses 12-hr almost universally |
| 🇨🇦 Canada | Mixed | English Canada prefers 12-hr; French Canada uses 24-hr |
| 🇯🇵 Japan | 24-hour | Official standard; broadcast and transport use 24-hr |
| 🇨🇳 China | 24-hour | Official standard across all contexts |
| 🇮🇳 India | Mixed | Rail, aviation: 24-hr; spoken: 12-hr common |
| ✈️ Aviation worldwide | 24-hour (UTC) | ZULU time; all aviation uses 24-hr + UTC |
| 🏥 Medicine worldwide | 24-hour | Prevents AM/PM errors in medication dosing |
| ⚓ Maritime worldwide | 24-hour | Ship logs and schedules always in 24-hr |
Frequently Asked Questions
Why is 12 PM noon and not 12 AM?
The terms AM (ante meridiem, before midday) and PM (post meridiem, after midday) are technically ambiguous at 12:00 because noon is neither before nor after itself. Convention assigns 12:00 PM to noon and 12:00 AM to midnight, though many style guides recommend saying "12 noon" and "12 midnight" to avoid confusion.
What does "Zulu time" mean?
Zulu time is the military/aviation designation for UTC (Coordinated Universal Time). The NATO phonetic alphabet uses Z (Zulu) for UTC, while other letters designate offset zones: A (Alpha) = UTC+1, B (Bravo) = UTC+2, etc. All flight plans, air traffic control, and meteorological reports use Zulu time to avoid time zone confusion.
How do I convert military time without a calculator?
AM times: drop the AM, add a leading zero if needed, remove the colon — 9:45 AM = 0945. Noon and PM times: for 12 PM = 1200; for other PM times add 12 to the hour — 3:30 PM: 3+12=15, so 1530. Midnight: 0000 or 2400 (both acceptable, but 0000 starts a new day).