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

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Calculation path

Step by step

  1. Start date

    Result: Jan 1, 2026

  2. End date

    Result: Apr 21, 2026

  3. Calendar difference

    Result: 110 days

  4. Without counting both days

    Result: 110 days

Instructions

How to use this calculator correctly

Input

  • Enter the start and end dates.
  • Only activate the additional option if you want both marginal days to count.

Read the result

  • The main number shows the difference in calendar days.
  • The week is only a rough classification.

Practical use

  • Suitable for deadlines, project durations, travel and contract periods.

Related guide: Working time, hours and industrial minutes in everyday life

Examples

Typical calculations

Three months without counting included.

Project duration

days between dates: 90

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FAQ

Frequently asked questions

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

Rule status and context

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