Date & Time
Time Duration Calculator
Elapsed time between two clock times, across midnight if needed.
How this time duration calculator works
The time duration calculator takes the numbers you enter and applies a standard formula for this kind of calculation, showing the result instantly with no page reload. Elapsed time between two clock times, across midnight if needed.
Everything runs client-side in JavaScript, so your inputs never leave your device — there's no server, no account and no tracking involved in getting your answer.
Frequently asked questions
Yes — if the end time is earlier than the start time, the calculator assumes it falls on the next day and adds 24 hours automatically.