Date & Time
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12 Hour to 24 Hour Time Converter.
Convert between 12-hour AM/PM time and 24-hour military time in either direction, with midnight and noon handled correctly.
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Breakdown
How to Use
FAQs
Is 12:00 AM midnight or noon?
12:00 AM is midnight, which is 00:00 in 24-hour time. 12:00 PM is noon, which is 12:00. This is the single most common mistake in time conversion, and this converter handles both explicitly.
How do I convert PM time to 24-hour time?
For any hour from 1 PM to 11 PM, add 12: 3:00 PM becomes 15:00 and 11:59 PM becomes 23:59. The exception is 12 PM, which stays 12:00.
How do I convert AM time to 24-hour time?
Hours from 1 AM to 11 AM are unchanged, just zero-padded: 7:05 AM becomes 07:05. The exception is 12 AM, which becomes 00:00.
What is military time?
Military time is the 24-hour clock written without a colon, such as 1345 for 1:45 PM. Hours run from 0000 (midnight) to 2359, so no AM/PM marker is needed and there is no ambiguity.
Can I convert in the other direction?
Yes. Use the swap control to switch to 24-hour to 12-hour mode, then enter a time like 00:30 to get 12:30 AM or 13:45 to get 1:45 PM.
Cite this calculator
Canonical URL: https://mathify.one/en/date/time-format
Cite as: Mathify. (2026). 12 Hour to 24 Hour Time Converter. https://mathify.one/en/date/time-format
Use Cases
Scheduling Across Time Formats
Quickly convert times for travel, work shifts, or international meetings to avoid confusion between AM/PM and military time.
Example: Convert 3:45 PM to 15:45 for a flight itinerary.
Understanding Military Time
Learn how to read and write military time by converting familiar AM/PM times to 24-hour format.
Example: See that 8:30 AM becomes 08:30.
Frequently Asked Questions
- How do I convert 12 AM to 24-hour time?
- 12 AM (midnight) is 00:00 in 24-hour time. The converter automatically adjusts the hour to 0 when you select AM and hour 12.
- What is 12 PM in 24-hour time?
- 12 PM (noon) is 12:00 in 24-hour time. The converter keeps the hour as 12 when you select PM and hour 12.
- Can I convert from 24-hour time back to AM/PM?
- Yes, the converter has a one-click swap feature. Enter a time in 24-hour format (HH:MM) and click swap to see the equivalent AM/PM time.
Tips & Common Mistakes
Tips
- Remember: 12 AM is 00:00, and 12 PM is 12:00. The converter handles these correctly.
- For times from 1:00 AM to 12:59 PM, the hour stays the same in 24-hour format (e.g., 9:30 AM = 09:30).
- For times from 1:00 PM to 11:59 PM, add 12 to the hour (e.g., 3:00 PM = 15:00).
- Use the swap button to quickly toggle between formats and double-check your conversions.
Common Mistakes to Avoid
- Assuming 12 AM is 12:00 in 24-hour time. It's actually 00:00.
- Forgetting to add 12 to PM hours after 12 PM. For example, 1 PM is 13:00, not 01:00.
- Entering minutes outside the 0-59 range. The converter expects valid minute values.
Last updated: August 13, 2026