Time Duration Calculator
Calculate elapsed time between two clock times, including overnight spans. See hours, minutes, decimal hours and total minutes.
Find the time between two clock times
Handles same-day and overnight durations automatically.
Calculate elapsed time between two times
This tool answers questions such as “How long is it from 9:15 AM to 4:40 PM?” If the end time is earlier than the start time, DateTimeWise treats it as an overnight span. You can also mark the next-day option explicitly.
The result includes conventional hours and minutes as well as decimal hours and total minutes. Those extra formats are useful for planning, logs and calculations that need numeric values.
Work shifts
For weekly shifts, lunch breaks, overtime and estimated pay, use WorkHoursTool. DateTimeWise keeps this page focused on general elapsed time.
Common examples
| Start | End | Duration |
|---|---|---|
| 8:00 AM | 5:00 PM | 9 hours |
| 10:30 PM | 6:15 AM | 7h 45m overnight |
| 13:20 | 16:05 | 2h 45m |
Same-day and overnight examples
| Start | End | Elapsed time |
|---|---|---|
| 09:15 | 17:45, same day | 8 hours 30 minutes |
| 22:30 | 06:15, next day | 7 hours 45 minutes |
| 09:00 | 09:00, next-day option enabled | 24 hours |
An end time earlier than the start is treated as the next day. Equal times produce zero unless you enable the next-day option. These are clock-time calculations and do not apply daylight-saving changes or subtract breaks automatically.
For actual timestamps across dates or time zones, use Date & Time Difference. Use Time Calculator to subtract a break from a duration, and Hours & Minutes for decimal conversion.