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Use this time duration calculator for a clear date & time estimate. Results update instantly in your browser.
What this calculator does
Find elapsed time between two clock times or dates.
How to use this calculator
- Enter the start and end values, including dates when needed.
- Review the calculation assumptions before using the result.
- The result handles overnight spans clearly.
How to calculate
Duration = end time − start time; add 24 hours when the selected clock interval crosses midnight.
Choose the calculation mode where available, then enter the values requested by the time duration calculator. Results update immediately.
Worked example
The defaults provide a complete worked example. Change any value to recalculate the result and any schedule shown.
Understanding your result
The result handles overnight spans clearly.
- Time-zone changes can affect real elapsed time.
- Double-check values and units before calculating.
Frequently asked questions
What does this time duration calculator do?
Find elapsed time between two clock times or dates.
How do I use this time duration calculator?
Enter the start and end values, including dates when needed.
What does the result mean?
The result handles overnight spans clearly.
What should I check before relying on it?
Time-zone changes can affect real elapsed time.