How to use the Add or Subtract Days calculator
- Enter the start date.
- Enter the number of days.
- Choose add or subtract and read the result date and weekday.
How it's calculated
Show the formula
Result = start date ± number of days, counting every calendar day
Good for deadlines, notice periods, warranty end dates and visa validity.
Worked example
These are the example numbers the calculator opens with. Change any of them above to see your own result.
You enter
| Start date | 3 November 2026 |
|---|---|
| Number of days | 90 |
| Direction | Add days |
You get
| Result date | 1 Feb 2027 |
|---|---|
| Day of week | Monday |
| Full date | Monday, 1 February 2027 |
Tips
- Useful for 30, 60 or 90-day deadlines, warranty periods and visa validity.
- If a deadline lands on a weekend, offices usually use the next working day.
Frequently asked questions
Does it skip weekends?
No, it counts every calendar day. Use Days Between Dates to count working days.
How do I find the date 3 months from now?
About 90 days, but months differ in length. For exact months, count calendar months instead.