How it works
Counts full 24-hour days between two calendar dates. Toggle "business days only" to skip Saturdays and Sundays (a fixed Mon–Fri week); for a custom weekend or public holidays, use the Business Days Calculator instead.
Days Between Dates
Quickly count the days between two dates, with an optional business-day calculation.
Interactive calculator
This calculator becomes interactive when JavaScript is available. The page still provides its method, limits and related tools without JavaScript.
Result classification
Mathematically exact. The result uses deterministic calendar or arithmetic rules on the values you enter. Dates are normalized before calculation, and invalid inputs are rejected.
Limitations
Exact for the stated rule and valid inputs; it does not decide legal, medical, contractual or policy questions.
Frequently asked questions
Why is the result one day different from what I expected?
By default, neither the start date nor the end date is counted. This gives the number of full days between them. Select "Count both" for an inclusive day count.
Practical guide
Reviewed 27 July 2026How to use the Days Between Dates
- Enter the known values.Use the date, time, place or duration requested above.
- Check the assumptions.Confirm time zone, weekend, inclusion and rounding choices when shown.
- Read and reuse the result.Copy, share or continue to a related tool without retyping unnecessary information.
Common uses
The Days Between Dates is useful for project schedules, contracts, delivery dates and personal planning.
Edge cases to check
Pay particular attention to month ends, leap years, inclusive counting and dates entered in reverse order.