How to add days to a date
Pick a date and a positive or negative offset.
1
Choose the date
Set the starting point.
2
Enter the offset
Use a positive number for later, negative for earlier.
3
Check the weekday
Move the date if it lands on a weekend or holiday.
What does this tool do?
Add or subtract calendar days from any date. Negative values move backwards. The result includes the weekday so you can immediately see whether a deadline lands on a weekend.
The Formula
Result date = Start date + Number of daysFrequently Asked Questions
Can I subtract days?
Yes. Enter a negative number to move backwards from the start date.
Does this account for leap years?
Yes. JavaScript date arithmetic handles leap years and month lengths automatically.