Work & time

Days Between Dates Calculator

For deadlines, contracts, vacations or project durations: The calculator shows the exact daily difference.

Updated on Apr 21, 2026 Calculator, calculation path and examples on one page

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Calculator

Examples

01/01/2026 to 03/31/2026.

days between dates: 89

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Counted with start and end day.

days between dates: 12

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Three months without counting included.

days between dates: 90

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FAQ

What does it mean to count start and end days?

Then another day is added to the pure difference.

Can I also calculate months?

The calculator deliberately returns days because months have different lengths.

Are leap years taken into account?

Yes. The calculation is made using real calendar data.

Can I use the calculator for notice periods?

For an initial orientation, yes. The wording in the contract or law remains decisive.

Why is the result one day higher when counting inclusively?

Because then both the start and end days count as full calendar days.

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Sources and notes

Calculation: Calendar difference between start and end date, optionally including both edge days.