Time & Date Calculators
Time Duration Calculator
Use this time duration calculator to find the exact difference between two dates and times in days, hours, minutes, and seconds.
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Formula
Duration = End date and time − Start date and time
Worked examples
From Monday 9:00 to Monday 17:00 is 8 hours.
From 1 May 2026 08:00 to 3 May 2026 10:30 is 2 days, 2 hours, and 30 minutes.
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Frequently asked questions
What does a time duration calculator do?
It calculates the elapsed time between a start date/time and an end date/time.
Can it calculate across different days?
Yes. It can calculate durations across days, months, and years.
What if the end time is before the start time?
The calculator will ask you to enter an end time that comes after the start time.