📌 Overview

Count the number of days, weeks and months between two dates. Includes an option to add or subtract days from a date.

📅 Date Difference Calculator

Count the number of days, weeks and months between two dates. Includes an option to add or subtract days from a date.

Mode

Start Date

End Date

Select dates to calculate the difference.

🔒 All processing happens in your browser. No data is uploaded to any server.

📋 How to Use

Pick a start date and an end date.
See the difference in days, weeks and months.
Switch to "Add / subtract" mode to shift a date.
Enter the number of days to add or subtract.

❓ FAQ

Are both dates included?

The difference counts the number of days between the two dates. Add one day if you need to include both endpoints.

How are months counted?

Months are approximate (average 30.44 days) for the summary; the day count is always exact.

Can I go backwards?

Yes. In add/subtract mode, enter a negative number of days to move to an earlier date.

💡 Use Cases

📃

Contracts

Count the exact term of an agreement.

⏳

Countdowns

See how many days until an event.

💼

Payroll & Billing

Work out billing periods and due dates.

🔗 Related Tools

📖 Deep Dive: Date Difference Calculator

Count the number of days, weeks and months between two dates. Includes an option to add or subtract days from a date.

Date Difference Calculator is a free tool that runs 100% in your browser. No signup, no uploads — your data stays private. Perfect for everyday text and data tasks, saving you time and reducing mistakes.