Date Difference Calculator

Find the exact number of days, weeks, months, and years between two dates.

Start date

End date

Runs entirely in your browser — free, private, no sign-up.

Questions answered

Frequently asked questions

Everything you might be wondering about the Date Difference Calculator.

Does it count leap years correctly?

Yes — it calculates the exact calendar difference between two real dates, so leap years are automatically accounted for.

Can I calculate age or a deadline countdown with this?

Yes — enter your birth date and today’s date for age in days/years, or enter today and a future date to see exactly how long until a deadline.

Is it free and private?

Yes — it runs entirely in your browser, free, with nothing uploaded.

See it in action

Real input, real output — so you know what to expect before you run it yourself.

Quick example

Sample input

Jan 1, 2026 to Jul 27, 2026

Sample output

207 days — 29 weeks — ~6.8 months.

More free tools

Hand-picked free tools that pair well with the Date Difference Calculator.

From the blog