How to Calculate the difference between dates

Calculate the difference between two dates in days, weeks, and months. Add or subtract days from any date. Supports weekend exclusion, business days, and bulk CSV calculations.

4 min read Date Calculator Free, no signup required

Quick start

Date Calculator — Calculate the difference between two dates in days, weeks, and months.

Get started in under two minutes:

Enter your values
Review and adjust settings
Review the output
Copy the result

Open Date Calculator

Step-by-step instructions

Follow these steps to get the best results from Date Calculator:

Enter your values

Fill in the required input fields. Results update in real time as you type.

Tip: Double-check your inputs — small errors in the data can produce misleading results.

Review and adjust settings

Use the settings panel to refine the output. Date Calculator lets you the difference between two dates in days, weeks, and months.

Tip: Most settings work well at their defaults — only adjust when you need specific output.

Review the output

Check the result against what you expected. Look for any errors or unexpected output.

Tip: Verify the result before using it in production.

Copy the result

Click the "Copy" button to copy the output to your clipboard. The button briefly changes to "Copied!" to confirm the action.

Tip: Paste the result directly into your project, code editor, or document.

Open Date Calculator

Frequently asked questions

Is Date Calculator free to use?

Yes — Date Calculator is completely free with no account or signup required. All core features are available immediately.

How accurate are the results?

Date Calculator uses industry-standard formulas. Results are accurate for general planning and estimation. For financial, medical, or legal decisions, consult a qualified professional.

Does Date Calculator work on mobile devices?

Yes — Date Calculator works on smartphones and tablets through any modern mobile browser. The interface adapts to smaller screens automatically.