Date Calculator
Find the number of days between two dates, or add or subtract a number of days from a date.
How to calculate a date
- Choose Difference or Add/subtract days.
- Enter your date(s).
- Read the result below.
Frequently asked questions
Can I subtract days instead of adding?
Yes — in Add/subtract mode, type a negative number to go backward from the start date.
Does the difference count include both dates?
The difference is the number of days between the two dates, not counting either endpoint twice.