Date ± Days Calculator
Adds or subtracts a number of days from a date.
Every calculation runs instantly in your browser, so your inputs are never sent to a server, and the tool is free with no sign-up. You can save the results as an Excel file with live formulas and reuse them later.
Inputs
- Start date
- Days to add (use − to subtract) (days)
Example calculation
Result date: 2026-10-31
| Day of week | Saturday |
|---|
Method & notes
Tips
Change any input and the result recalculates in real time. After downloading the Excel file, you can reuse it by editing only the yellow input cells.
FAQ
How does the Date ± Days Calculator work?
Adds or subtracts a number of days from a date.
Can I save the results?
Yes. You can download the results for free as an Excel (.xlsx) file with live formulas that recalculate when you change the yellow input cells.
Is it free?
Yes — all Calcova calculators are free, and you can save results as an Excel file.