Date Difference Calculator

We calculate the absolute difference in milliseconds between your two dates and convert it to whole days, so the result is accurate no matter which date you enter first.

Business days are Monday through Friday; Saturdays and Sundays are excluded from the count. Public holidays aren't automatically excluded since they vary by country and industry.

Months and years have varying lengths, so we calculate a calendar-accurate breakdown (like counting on a wall calendar) rather than a flat average, which gives a more intuitive, real-world result.

The calculator automatically works out the absolute difference and shows a note letting you know the dates were reversed, so you always get a positive, usable result.

Yes — the total weeks figure is the total number of days divided by 7, rounded to the nearest whole number.