Time Duration Calculator
Four calculations in one place: how long between two times, how long between two dates, what time it will be after a duration, and the sum of several durations. Shifts over midnight are handled for you.
How to use this tool
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1
Pick the calculation from the four tabs — a gap between two clock times or two dates, a time shifted by a duration, or several durations added together.
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2
Fill in both fields. Everything recalculates as you type; in the last two tabs the round button flips between + and −.
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3
Click any row of the reference table to drop that duration straight into the calculator, then Copy Result to take the answer with you — or Share to send a friend a link that opens the very same calculation.