About this tool
Find how long it is between two dates, for deadlines, anniversaries, project timelines or notice periods.
How to use Date Difference Calculator
- Choose a start date.
- Choose an end date.
- Press Calculate to see the gap in several units.
Frequently asked questions
Is the end date included?
No. The result counts the days from the start date up to, but not including, the end date.
What if the end date is earlier?
The tool swaps them and still shows the positive difference.