Add or Subtract Days
Add or subtract any number of days from a date — see the resulting date and day of the week instantly.
Operation
Result
July 21, 2026
Tuesday
Starting date
Sunday, June 21, 2026
Result date (YYYY-MM-DD)
2026-07-21
Day of week
Tuesday
How to add or subtract days from a date
- Select your starting date.
- Choose Add or Subtract.
- Enter the number of days. The result updates instantly.
- The result shows the new date and its day of the week.
Common uses
This tool is handy for deadline calculations ("what date is 90 days from today?"), payment terms ("net 30 from invoice date"), contract periods, event planning, and shipping estimates. The result automatically spans across month boundaries and accounts for different month lengths and leap years.
Note: this tool counts all calendar days. To count only working days (Mon–Fri), use the Business Days Calculator.
Privacy — runs in your browser
Calculations happen entirely in your browser. No dates or data are sent to any server. No signup required.
Frequently Asked Questions
What is 30 days from today?
Select today as your start date, enter 30, and choose Add. The result is your answer.
Does it handle month boundaries?
Yes — adding 31 days from January 1 gives February 1, not January 32.
Can I subtract past a year boundary?
Yes — subtracting 400 days from January 1, 2025 correctly gives November 27, 2023.