Free Date & Time Tools

Work out date differences, add or subtract days, and convert time formats instantly, entirely in your browser.

Frequently asked questions

Why do 'days between dates' answers differ between sites?

Endpoint counting. Some tools count the days spanned (Monday to Wednesday = 2), others count the dates touched (= 3). Neither is wrong — but for a deadline, the difference is a day, so check which rule the tool states before you rely on it.

Is my date of birth sent anywhere when I use the age calculator?

No — the calculation runs in the page, so your birth date is never transmitted or stored. It is exactly as private as working it out on paper.

Can I set a countdown to an exam or application deadline?

Yes — the countdown tool takes any future date and shows the time remaining. Handy for form-closing dates, which are the deadlines people most often miss by a day.