Time Duration Calculator
Measure the stretch between two date-and-time values, broken into days, hours, minutes and seconds and totalled in seconds. It's handy for timesheets, events and experiments, and it all happens in your browser.
- 100% free
- Private & safe
- Runs in your browser
Why use Time Duration Calculator?
Time Duration Calculator works out the answer precisely from local calendar dates, so there are no timezone or daylight-saving surprises.
- Runs instantly in your browser — nothing to install, nothing uploaded.
- Completely free, with no account, no watermarks and no usage limits.
- Duration = |end − start|, split into d/h/m/s
- Pick a start date and time.
- Works on any device — desktop, tablet and phone — and is fully keyboard accessible.
How to use Time Duration Calculator
- Pick a start date and time.
- Pick an end date and time.
- See the duration in days, hours, minutes and seconds.
- Read the total number of seconds elapsed.
Examples
- Timing a task from start to finish.
- Working out hours between two shifts.
Supported formats & limits
- Duration = |end − start|, split into d/h/m/s
Limitations
- Uses your device's local time.
- Order does not matter — the duration is absolute.
Frequently asked questions
Does it include seconds?
Yes — set the time with seconds and the result includes them.
Can the end be before the start?
Yes — the duration is the absolute difference either way.
Is anything uploaded?
No — it runs in your browser.
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