13:13 in 24-hour time = 1:13 PM in 12-hour AM/PM format. Conversion is straightforward: 00:xx = 12:xx AM (midnight), 01-11 = same hour AM, 12 = 12 PM (noon), 13-23 = subtract 12 and add PM.
24-hour to 12-hour conversion table
| 24-hour | 12-hour | 24-hour | 12-hour |
|---|---|---|---|
| 00:00 | 12:00 AM (midnight) | 12:00 | 12:00 PM (noon) |
| 01:00 | 1:00 AM | 13:00 | 1:00 PM |
| 02:00 | 2:00 AM | 14:00 | 2:00 PM |
| 03:00 | 3:00 AM | 15:00 | 3:00 PM |
| 04:00 | 4:00 AM | 16:00 | 4:00 PM |
| 05:00 | 5:00 AM | 17:00 | 5:00 PM |
| 06:00 | 6:00 AM | 18:00 | 6:00 PM |
| 07:00 | 7:00 AM | 19:00 | 7:00 PM |
| 08:00 | 8:00 AM | 20:00 | 8:00 PM |
| 09:00 | 9:00 AM | 21:00 | 9:00 PM |
| 10:00 | 10:00 AM | 22:00 | 10:00 PM |
| 11:00 | 11:00 AM | 23:00 | 11:00 PM |
💡 Did you know? The US Navy, Army, and Air Force use 24-hour time for all operations to avoid AM/PM confusion in life-or-death situations. The international standard ISO 8601 requires 24-hour format for all date/time representations in documents, APIs, and databases.
Frequently Asked Questions
13:13 24-hour = 1:13 PM 12-hour. Formula: if hour is 0, it's 12:00 AM (midnight). If hour is 1-11, it's AM with the same hour. If hour is 12, it's 12:00 PM (noon). If hour is 13-23, subtract 12 and add PM.
13:00 24-hour = 1:00 PM 12-hour. Hours 13-23 convert by subtracting 12 and adding PM. So 14:00 = 2:00 PM, 15:00 = 3:00 PM, ..., 23:00 = 11:00 PM.
00:00 24-hour = 12:00 AM (midnight) 12-hour. Hour 0 converts to 12 with AM. The day starts at 00:00 (midnight) in 24-hour format.
12:00 24-hour = 12:00 PM (noon) 12-hour. Hour 12 is the only hour that stays the same when going from 24-hour to 12-hour. 12:00 = noon, 12:00 AM = midnight.
The 24-hour clock runs from 00:00 (midnight) to 23:59 (one minute before next midnight). It eliminates AM/PM ambiguity. Used in military, science, aviation, computing, and most countries outside the US. ISO 8601 requires 24-hour format.
In Excel: =TEXT(A1, "h:mm AM/PM") converts 24-hour time to 12-hour format. If A1 contains 13:30, the result is "1:30 PM". Use "hh:mm AM/PM" for zero-padded hour.
19:00 24-hour = 7:00 PM 12-hour. 19:00 is common in 24-hour time (TV guides, military, transport schedules).
The US inherited 12-hour time from British colonial era and never fully transitioned. In 1975, the US military and federal government adopted 24-hour time for all official communications. Most consumer products and casual contexts in the US still use 12-hour with AM/PM.