How to use this calculator
- 1
Choose the calendar date you are starting from.
- 2
Select “Add days” or “Subtract days” and enter a whole number.
- 3
Read the resulting date and weekday. Weekends and holidays are included.
The calculation, explained
Resulting date = start calendar date + or − the chosen number of calendar days. The start date itself is day zero.
A QUICK EXAMPLE
February 28, 2024 + 1 day
Thursday, February 29, 2024Frequently asked questions
Is the starting date counted?+
The starting date is day zero. Adding 1 day to a Monday gives Tuesday. Adding 0 days returns the original date.
Are weekends and leap years handled?+
All calendar days are included. Month lengths and Gregorian leap years are handled automatically, including century rules such as 2000 being a leap year and 2100 not being one.