Date Difference Calculator
Find the exact number of days, weeks, and hours between any two dates.
Select an end date to see the difference.
About the Date Difference Calculator
This date difference calculator counts the interval between two dates in days, weeks, months and years, and separates working days from weekends. That distinction is what makes it usable for deadlines, notice periods and project planning.
A date difference calculator answers how long there is between two dates without counting squares on a calendar. Contract notice periods, project deadlines, invoice terms, holiday planning and shipping estimates all reduce to this one question.
The working-day split is the useful part. Thirty calendar days is roughly twenty-one working days, and a deadline quoted in business days lands somewhere quite different from one quoted in calendar days. Both totals are shown so there is no ambiguity about which was meant.
Leap years and differing month lengths are handled from the actual calendar rather than approximated, so a span crossing 29 February counts correctly. Dates in the past and future both work, making it equally useful for elapsed time and countdowns.
How to use the Date Difference Calculator
- Enter the start date. Pick or type the first date.
- Enter the end date. Pick or type the second date, past or future.
- Read the totals. See the difference in days, weeks, months and years.
- Check the working days. Compare the calendar-day and working-day counts for planning.
Date Difference Calculator features
- Interval in days, weeks, hours and minutes
- Calendar breakdown in years, months and days
- Working days counted separately from weekends
- Quick presets such as today plus 7, 30 or 365 days
- Leap years handled by real calendar arithmetic
- Runs in your browser; dates are not uploaded
Frequently asked questions
Does it exclude weekends?
It reports working days separately, counting Monday to Friday and leaving Saturday and Sunday out of that figure. Public holidays are not deducted — those vary by country and region, so subtract them yourself for a contractual deadline.
Why do the day count and the calendar breakdown look inconsistent?
They answer different questions. The day count is the exact number of days between the dates; the breakdown expresses the same span in years, months and days, and months are not a fixed length. Both are correct.
What is this most used for?
Notice periods, payment terms, project durations and deadlines — anywhere the difference between calendar days and working days changes the answer, which is most contracts.
Are leap years handled?
Yes. The interval is computed from real calendar dates rather than by assuming 365 days per year, so spans crossing 29 February come out right.
Can I use dates in the past and the future?
Yes, in either order and as far out as you like. Historical dates work too, subject to the usual caveat that calendar reforms make very old dates ambiguous.