Date Difference
Find the time between any two calendar dates.
Date & Time
Time Duration Calculator
Calculate elapsed time, including overnight hours.
Your details
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Duration
8h 30m 0s
- Decimal hours
- 8.5
- Total minutes
- 510
- Total seconds
- 30,600
How to use this tool
- Enter start and end times, including seconds if needed.
- Add dates when the interval spans more than one day or you need an explicit chronology.
- Calculate and compare hours/minutes/seconds with decimal hours.
Formula & method
Convert each time to seconds after midnight and subtract. Without explicit dates, an earlier end time adds 24 hours. With dates, add the elapsed calendar days and reject a negative overall duration. Decimal hours equal seconds divided by 3,600.
A practical example
From 22:30 to 01:15 without dates, the overnight duration is 2 hours and 45 minutes, or 2.75 decimal hours.
When this tool is useful
Check the length of a session, an overnight shift, or a recorded activity. Decimal hours help when a downstream worksheet expects a single number rather than an hours-and-minutes duration.
Common mistakes and limitations
- 2 hours 30 minutes is 2.5 decimal hours, not 2.30.
- This is a wall-clock calculation. It does not adjust elapsed time for a time-zone or daylight-saving transition.
Frequently asked questions
How is an earlier end time handled without dates?
It is treated as occurring on the following day. For example, 22:30 to 01:15 gives 2 hours 45 minutes. Supply dates for longer intervals.
Does the duration subtract breaks?
No. It measures the entered interval. Subtract unpaid breaks separately if you are using the output for a timesheet.