Time Duration Calculator
End must be after start.
Duration —
Total days —
Total hours —
Total minutes —
Counts the exact elapsed time between two moments, down to the second — including the time of day, unlike the whole-day count in the Date Calculator.
Free time duration calculator that finds the exact elapsed time between two specific moments — down to the second, including both the date and time of day.
How it works
- Enter a start date and time, and an end date and time
- See the duration as years/months/days/hours/minutes/seconds
- Also see the total in days, hours, and minutes
Frequently asked questions
How is this different from the Date Calculator?
The Date Calculator's "days between two dates" mode ignores time of day and counts whole days. This tool includes the time of day on both ends, down to the second — useful for measuring exactly how long something took, not just which dates it spanned.
Related tools
From the blog
Update history
- 2026-09-01 Launched: time duration calculator for the exact elapsed time (down to the second) between two date+time moments. Entirely client-side.