Time Duration Calculator
Measure two times, or two dated moments. A clock-only interval uses fixed 24-hour days.
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How this calculator works
A reversed same-day input produces a negative interval. Choose next day explicitly for an overnight shift. Dated inputs use the selected time zone; non-existent local times are rejected, and you choose which occurrence to use in a repeated hour. Actual elapsed time and clock-face difference are reported separately. Breaks cannot exceed the absolute elapsed interval.
Calculations stay on your device. Empty or invalid inputs produce an explicit error. Interactive results require JavaScript.
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Save on this device, or copy settings into a link. Shared links contain your inputs; share only the details you intend.