Date Difference Calculator
Pick a start and end date to get the difference broken down into years, months, and days, plus the total number of days — useful for counting down to an event or measuring a duration between two dates.
Calculators Runs entirely in your browser
All calculations happen on your device — dates are never sent to a server.
What this tool does
Calculates the gap between two dates in years, months and days, in total days, and in total weeks.
When to use it
- Working out the length of a contract or subscription.
- Finding how long remains until a deadline.
- Calculating the length of a stay or a trip.
- Working out length of service or experience for a CV.
How to use it
- Pick the "First date".
- Pick the "Second date".
- Click "Calculate difference" and read the result in all three forms.
A practical example
Input
Two dates roughly eighteen months apart.
Output
The gap in years, months and days, with the total days and total weeks.
Limitations
- The count includes every day, weekends and holidays included; for working days only, use the Working Days Calculator.
- Invalid dates are rejected with a clear message.
- The order of the two dates does not matter; the gap between them is the same either way.
Privacy and processing
All calculations happen on your device and the dates are never sent to a server.
Technical notes
- The months component accounts for their differing lengths, so it is not days divided by 30.