Date Difference Calculator
Find out exactly how many days, weeks, months and years are between two dates.
How it works
This calculator finds the exact span between two calendar dates, showing both a calendar-accurate breakdown (years, months, days) and the total number of days and weeks. It correctly handles varying month lengths and leap years.
Common uses
- Counting down to a wedding, deadline, or event
- Calculating contract or lease durations
- Working out someone's age or a project's duration
- Legal and medical calculations that require an exact day count
Frequently asked questions
Does the calculator count both the start and end date?
The result shows the number of full days, weeks, months and years between the two dates you enter - the start date itself is day zero, and the count runs up to (and including) the end date.
Why does it show years, months and days instead of just total days?
A single total-days number is useful, but a breakdown into years, months and days is often more meaningful for real-life planning - like knowing a project ran "2 months and 10 days" rather than "71 days".
Can I calculate the difference for a future date, like a deadline or event?
Yes - enter any two dates, past or future, in either order, and the tool will calculate the exact gap between them, which is useful for countdowns to events, deadlines, or anniversaries.