Date Difference Calculator — Years, Months & Days
Calculate the exact difference between two dates in years, months, and days.
How to use this tool
- Enter start date and end date in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your years and the full breakdown beneath it.
Calculate the exact difference between two dates in years, months, and days.
Frequently asked questions
- What if the end date is before the start date?
- The calculator always returns a positive difference regardless of order.
- How are partial months counted?
- After subtracting whole years and months, the remaining calendar days in the partial month are counted using the number of days in the preceding month.