Calculators

How to Use the Date Difference Calculator

2026-11-134 min readBy Apex Tool Station Team

Count the days, weeks, months and years between two dates, with optional business-day count.

100% free No signup Works in your browser

Open the Date Difference Calculator tool

1. What is the Date Difference Calculator?

Count the exact number of days between two dates for deadlines, notice periods, pregnancies, project plans and holidays. The tool also shows weeks, business days (Monday–Friday) and a years-months-days breakdown.

2. How to use the Date Difference Calculator

Here is the whole process, step by step. It takes less than a minute from opening the tool to seeing your result.

1Fill in the Start date, End date fields.
2Your result updates as you type — read it below the fields, with its breakdown where shown.

Press the "Calculate" button and your result appears on the page.

Everything runs in your browser — your files and text never leave your device.

3. What you can do with it

Run the tool with the "Calculate" button when your input is ready.
Start over any time with the "Reset" button — it clears the tool so you can begin again.

4. Tips for best results

Your text never leaves your device — The tool runs entirely in your browser using JavaScript. Nothing is uploaded, so you can paste private documents without worry. That also means there is no account to create and no file to upload.
It works on your phone too — Open the tool in any modern browser on Android or iPhone. The layout adjusts to the screen and everything works the same way on a small screen as on a desktop.
Read the breakdown, not just the headline number — The result updates as you type. The breakdown underneath shows how the number was worked out, which is where mistakes usually show up.