Add Days to Date
Add or subtract days from any date instantly.
Free add-days-to-date calculator. Start from any date, add or subtract a number of days, and get the resulting date with its weekday. Ideal for due dates and deadlines. Runs in your browser.
How to use the Add Days to Date
- 01Choose a start date.
- 02Enter how many days to add or subtract, and pick the direction.
- 03The resulting date and weekday appear instantly — copy it if you need.
Frequently asked questions
Does it account for month lengths and leap years?
Yes. The calculation uses real calendar arithmetic, so months of different lengths and leap years are handled correctly.
Can I subtract days too?
Yes. Switch the direction to subtract and the tool counts backwards from your start date.