Days Between Dates Calculator

How to use this calculator

Enter your values. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.

How days are counted

By default the calculator counts the days after the start date up to and including the end date, which is the usual way to measure a duration (Monday to Tuesday = 1 day). Tick “Include the end date” to count both the first and last day, as for a hotel stay counted in days rather than nights, or a leave request that includes both days.

Business days skip Saturdays and Sundays; public holidays aren’t removed.

Month lengths

Because months have 28–31 days, “months + days” is counted on the calendar (Jan 15 → Mar 15 is exactly 2 months), not by dividing by 30.

Frequently asked questions

About this tool

Written by

[Author: to be assigned]

Reviewed by

Formula tests passed · human review pending

Last updated

31 Oct 2026

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