Date Difference Calculator (Days Between Dates)

Count the time between any two dates. You get the total number of days, the number in weeks, the working days (Monday–Friday), and a full years-months-days breakdown.

How this calculation works

Total days is the plain calendar distance between the two dates. The order does not matter — the result is always positive.

Working days count Monday to Friday and include both the start and end dates, matching the common NETWORKDAYS convention (public holidays are not deducted).

The years-months-days breakdown counts complete calendar months using their real lengths, the same way the age calculator does.

Worked example

From 6 July 2026 to 10 July 2026 is 4 days, which spans 5 working days (Monday through Friday, both ends counted).

Calendar days vs. business days

Calendar days count every day between the two dates. Business (working) days count only Monday to Friday. This calculator gives both, because contracts and shipping estimates usually mean business days while countdowns mean calendar days.

Counting inclusively vs. exclusively

The classic "off by one" question. From Monday to Friday there are 4 nights but 5 days if you count both ends. This tool reports the duration (end minus start) for total days, and counts business days inclusively of both endpoints, matching the common spreadsheet NETWORKDAYS function.

Holidays are not deducted

Public and religious holidays vary by country, region and year, so the working-day count does not remove them. If your deadline depends on official holidays, subtract those days manually for your locale.

Everyday uses

Notice periods and contract terms
Project deadlines and sprint lengths
Due dates, warranty and return windows
D-day countdowns to exams, trips or events
Age of an account, pet or relationship

Frequently asked questions

Does it count working days?

Yes. Working days include Monday to Friday and both endpoints. It does not subtract national or regional public holidays, which vary by country.

What is a D-day countdown?

Set the end date to a future event and the total days tells you how many days remain — a D-day countdown. Past dates count up instead.

Does the order of the two dates matter?

No. The calculator always returns a positive duration regardless of which date is earlier.

Does it include both the start and end dates?

Total days is the duration (end minus start). Business days are counted inclusively of both endpoints, the same convention as the NETWORKDAYS spreadsheet function.

Why is the business-day count what it is?

It counts every Monday through Friday in the span and includes both endpoints, but it does not remove public holidays, which differ by country and year.

Does it handle leap years?

Yes. The day count uses real calendar dates, so 29 February in leap years is included automatically.

Can I use it as a D-day countdown?

Yes. Put a future event as the end date and the total days tells you how many days remain; a past date counts up instead.

This tool is provided for general information only. Verify important figures independently. · Last reviewed: August 25, 2026