Does the days-between result include the start date?

The result reports the elapsed day difference between the two dates. Check the displayed dates when you need an inclusive calendar count.

DATE MATH ONLINE TOOL

Calendar Calculator

Add or subtract days from any date, or measure the time between two dates without doing the math by hand.

Add days Subtract days Days between

Start here

What do you want to calculate? Move forward with a positive number, or backward with a negative number.

Start date Choose the date to start from. Days to add or subtract Use a negative number to count backward.

Your dates stay in your browser.

Your answer

Your result will appear here

Choose a date and run the calculation to see a clear, calendar-ready answer.

A quick guide

Use the mode that matches your question, then read the answer in both a practical and a precise format.

Enter a start date and a number of days. Positive numbers move forward; negative numbers move backward.

Switch modes to compare two dates. The result is the elapsed calendar difference, shown as days and weeks.

What can a calendar calculator do?

It can add or subtract days from a base date and calculate the number of days between two dates.

Can I subtract days from a date?

Yes. Use a negative day offset in add or subtract mode to move backward from the base date.

Is the days-between result inclusive?

The result is the elapsed difference between the two dates. Apply an inclusive-count rule separately when your use case requires it.