Date Add/Subtract Calculator
Add or subtract days, find the new weekday
Use this when you need a fast, accurate result — no sign-up, works entirely in your browser.
Resulting date—
Day of week—
Number of days added—
How to Use
- Enter your details into the fields above.
- Click the calculate button to get your result instantly.
- Use the clear button to start a new calculation.
Example
- 2026-09-08 + 14 days → 2026-09-22 (Tuesday)
- 2026-09-08 plus 90 days → 2026-12-07 (Monday)
Formula
Resulting date = start date ± N days. Pass a negative value to subtract. Both inputs must be valid dates.
About Date Add/Subtract Calculator
Add or subtract days, find the new weekday. This free online tool gives you fast, accurate results without registration or downloads.
Everything runs locally in your browser, so your data is never uploaded or stored — privacy first.
Frequently Asked Questions
Is this tool free to use? +
Yes, it is completely free with no registration or download required.
Is my data private? +
Yes. Everything is processed locally in your browser. Nothing is uploaded or stored on our servers.
Does it work on mobile? +
Yes, it works on any device — phone, tablet, or desktop.