What is a Date Difference Calculator?
A Date Difference Calculator works out the time between two dates in years, months and days, plus the total number of days and weeks.
It is useful for counting notice periods, project durations, ages and deadlines. The result uses the real calendar, including leap years.
How to use the Date Difference Calculator
- Enter start date.
- Enter end date.
- Tap Calculate to see the result.
- Tap Reset to clear the fields and try again.
Who should use it
- Employees counting notice periods
- Students tracking exam countdowns
- Anyone planning events
Key terms
- Start date
- The first date.
- End date
- The second date.
Frequently asked questions
Does it include the end date?
No. It counts the days between the two dates.
Does it handle leap years?
Yes.
Can I count only working days?
Yes. Use the Business Days Calculator.
Is my data stored?
No.
Is my data stored?
No. Everything you enter stays in your browser and is cleared when you close the page.
Last updated: 1 November 2026