Date Calculator

Calculate date differences, add or subtract days from dates, and find days between two dates. Perfect for planning deadlines, events, and countdowns.

How to Calculate Dates

  1. 1 Choose Add/Subtract Days or Date Difference mode
  2. 2 Enter a start date using the date picker
  3. 3 For add/subtract: enter the number of days, weeks, or months
  4. 4 For difference: select an end date
  5. 5 Click Calculate to see the result with detailed breakdown

Frequently Asked Questions

Is my code or data stored anywhere?

No. All developer tools process data locally in your browser. Nothing is sent to any server or logged.

Can I use these tools offline?

Yes! After the initial page load, most developer tools work without an internet connection.

Are there API limits?

No limits. Since processing happens in your browser, you can use the tools as much as you need.

Is the output compatible with production use?

Yes. Our tools produce standard-compliant output suitable for production environments.

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Last updated: January 15, 2026 · v2.1