Add Days to a Date Calculator
Pick a start date and the number of days to add to find the resulting date.
Add Days to a Date Calculator
Add a number of days to a date to find what date it lands on.
This calculator provides an estimate for general informational purposes only. It is not a substitute for professional financial, mechanical or engineering advice.
This calculator adds a chosen number of days to a start date on the real calendar, automatically accounting for month lengths and leap years, to find the exact resulting date.
Example
- With the default values shown above, this calculator returns: Resulting Date ≈ day-serial 20,744.
Frequently Asked Questions
Can I subtract days instead?
Yes — enter a negative number of days to subtract instead of add.
Does this account for leap years?
Yes, the calculation is based on the actual calendar, so leap years are handled automatically.