Free · Browser-Based · Date Planning

Date Difference Calculator

Compare two dates and instantly see the gap in total days, approximate weeks, calendar years and months, and weekday-only business days.

Start date

End date

Include end date

Working week

Difference summary

🎯 Common Use Cases

Measure project timelines

Calculate countdown lengths

Check weekday-only work spans

Compare contract or billing periods

Does this include business days?

Yes. You can estimate weekday-only spans with Mon-Fri or Mon-Sat workweek rules.

Can I include the end date?

Yes. Toggle the inclusive option if your workflow counts both dates.

Is timezone handling server-side?

No. The tool uses your browser's local calendar.