Does the order of the dates matter?

No. The gap is always shown as a positive difference.

Are leap years included?

Yes, every real calendar day between the two dates is counted.

Can I compare any two dates?

Yes. If they are not birth dates, the date difference calculator does the same job with clearer labels.

ToolNova

Age Difference Calculator

Enter two dates of birth to see the exact age gap between two people in days, months and years.

First birth date

Second birth date

Enter valid values to see the result instantly.

How to use the Age Difference Calculator

1Pick the first person's date of birth.
2Pick the second person's date of birth.
3Read the gap in days, with the years and months breakdown underneath.

About this tool

The calculator counts the real number of days between the two dates, including leap days, then converts that total into an approximate years-and-months figure.

Because months vary in length, the years and months breakdown is a close approximation while the day count is exact.

Benefits

Instant results
There is nothing to submit or wait for — the result updates as soon as you change something.
Free and unlimited
No account, no sign-up and no daily cap — use it as often as you need.
Works on your phone
The layout, buttons and inputs are built mobile-first and are fully keyboard accessible.