The best free date difference calculator counts the exact time between two dates in days, weeks and months, right in the browser. It is free with no account and does the math locally, so it is quick and private.
Figuring out how many days sit between two dates by hand means fighting with month lengths and leap years. The best calculator takes a start date and an end date and returns the difference in days, and often in weeks and months too, so you can plan a deadline, count down to an event or work out a billing period without a spreadsheet.
Because the arithmetic runs in your browser the answer appears as soon as you pick the two dates, with no submit button and no server round trip. There is no account and no cost, and it keeps working offline once the page has loaded. That makes it a reliable helper for scheduling, project timelines or simply settling a question about how long ago something was.
It shows the difference in days, and typically in weeks and months as well.
The math runs in your browser, so it works instantly and offline once loaded.
Yes. There is no account or cost.