Date Difference Calculator

Find the number of days and weeks between two dates.

Enter your details and select Calculate.

This tool provides an estimate. Verify results before making financial, educational or medical decisions.

Days between two dates

This guide explains how to use the calculator, includes an example, discusses limitations and answers common questions.

Date differences can be measured as elapsed days, calendar weeks or inclusive date counts. The definition matters for deadlines and bookings.

How to use this calculator

Select the start and end dates. The standard elapsed-day difference excludes the start date; add one only when you specifically need an inclusive count.

Worked example

From 1 March to 8 March there are 7 elapsed days, but 8 calendar dates if both endpoints are counted.

When this calculator is useful

Useful for planning trips, tracking project durations, counting days until events and comparing dates.

When not to rely on it

Legal deadlines, business days and holiday calendars may use different counting rules. Time zones can also matter when exact times are involved.

Practical tip

For contracts or official deadlines, check whether the first day counts and whether weekends or holidays are excluded.

Frequently asked questions

Does the start date count?

Elapsed-day calculations usually exclude it; inclusive counting includes both endpoints.

Are weekends excluded?

Not unless a business-day rule is explicitly applied.

Do leap years matter?

Yes. Calendar calculations include 29 February in leap years.

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Educational information only. Results are estimates unless otherwise stated. Verify important financial, medical or legal decisions with a qualified professional.