Counting days between two dates by hand is easy to get wrong, especially across months with different lengths or leap years. Pick a start and end date here and get the exact gap — in years, months, and days, plus total days and weeks — instantly.
How to use the date difference calculator tool
- 1
Enter the start date
Pick the earlier date.
- 2
Enter the end date
Pick the later date — or any second date, the calculator handles either order.
- 3
Read the difference
See the gap broken into years/months/days, plus total days and weeks.
Common use cases
Count down to a deadline or event
Find exactly how many days remain until a due date, trip, or event.
Calculate a project or contract duration
Find the total length of a project, lease, or contract period.
Work out time since a past date
Find out how long it's been since a specific date.
Frequently asked questions
No — enter them in either order and the calculator shows the absolute difference between the two dates.