Date Calculator

Calculate the number of days between two dates or add/subtract days from a date.

Calculation Type

Start Date

End Date

Days Between: Count the number of days from one date to another

Add Days: Find the date that is X days after a given date

Subtract Days: Find the date that is X days before a given date

All calculations account for leap years and varying month lengths.

Does this calculator include the start date?

For "days between," we count from the start date to the end date. The exact count depends on whether you include both dates.

How does it handle leap years?

This calculator automatically accounts for leap years (every 4 years, except centuries unless divisible by 400).