OnlineAITool
Calculators

Date Difference Calculator

Days, weeks, months and years between two dates.

Updates as you type
Nothing is sent anywhere

Your figures

Result

How to use this tool

  1. Enter your own figures over the defaults — Start date, End date.
  2. The answer updates as you type. There is no button, and nothing is sent anywhere.
  3. Change one input at a time to see how sensitive the answer is to it.

Month and year figures are approximate because months vary in length. The day count is exact.

How it works

This takes 2 inputs — start date, end date — and returns enter both dates. The whole calculation happens in this page as you type: there is no submit button, no request, and nothing stored.

A worked example

Worked through with the figures the page already has in it: start date of undefined and end date of undefined, giving enter both dates of —. These numbers come from running the calculator’s own code, not from being typed in here, so they cannot drift away from what you see on screen.

Starting from:

  • Start date: undefined
  • End date: undefined
ResultValue
Enter both dates—

Date Difference Calculator — frequently asked questions

Is the day count exact?

Yes, including leap years. The month and year figures are approximations using average month length.

Does it include both end dates?

It counts the interval between them. Add one if you need to count both the start and end days inclusively.

Can I use it for working days?

No, it counts calendar days including weekends and holidays.

Is this calculator free?

Yes, with no account, no limits and no data collection. It runs entirely in your browser.

Should I rely on this for a financial or medical decision?

No. It is a planning estimate built on standard formulas and stated assumptions. For decisions that matter, speak to a qualified professional who can account for your full circumstances.

Is this calculator accurate?

The arithmetic is exact — it uses the standard formula. What limits accuracy is the assumptions: the figures you enter, and factors the formula does not model such as fees, taxes and rule changes.

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Background reading: Loan, Mortgage and Investment Calculators Explained

Nothing is sent anywhere. The figures you type stay in this page and are never transmitted or stored — how that works.

Disclaimer. The formula is exact; the answer is only as good as the figures and assumptions above. Not financial, tax, medical or legal advice. Full disclaimer.