Does it handle leap years?

Yes, day counts use the real calendar, including February 29.

What does 'include the end date' do?

It counts both the first and last day, so Monday to Friday is 5 days instead of 4.

Can I find a date 90 days from now?

Yes, use the add/subtract section with today as the starting date.

Date Difference Calculator

Count the days between two dates, or add and subtract days from a date.

datediff.exe

Days between two dates

Start dateEnd date

Include the end date in the count

Days

Weeks

0w 0d

Approx. months

Add or subtract days

From dateDays

Direction

Resulting date

Thu, Oct 29, 2026

How to use Date Difference Calculator

01Pick a start and end date to see the difference in days, weeks and approximate months.
02Tick 'include the end date' if both days should count, as with hotel nights or leave requests.
03Use the second section to add or subtract a number of days from any date.

About Date Difference Calculator

Day counts are exact: the calculator measures whole calendar days between the two dates, so leap years and month lengths are handled for you. The weeks figure shows complete weeks plus the leftover days.

The months figure is a calendar approximation — the number of month boundaries crossed — because months vary from 28 to 31 days. For deadlines, use the exact day count rather than months.

Frequently asked questions

Does it handle leap years?: Yes, day counts use the real calendar, including February 29.
What does 'include the end date' do?: It counts both the first and last day, so Monday to Friday is 5 days instead of 4.
Can I find a date 90 days from now?: Yes, use the add/subtract section with today as the starting date.