How to add days to a date
Select your starting date, choose “Add days,” and enter the number of calendar days you want to move forward.
How to subtract days from a date
Select “Subtract days” to move backward from the starting date by the number of calendar days entered.
This calculator uses calendar days. Weekends are included in the count. A separate business-day calculator can be added later for calculations that exclude weekends or holidays.
Date calculation example
If the starting date is January 1 and you add 30 calendar days, the calculator advances exactly 30 days, including any weekends that fall within that period.
Frequently asked questions
Does the date calculator include weekends?
Yes. This calculator counts calendar days, so weekends are included.
Can I subtract days instead of adding them?
Yes. Select the subtract option and enter the number of days you want to move backward.
Can I use the calculator for future dates?
Yes. You can choose any valid start date and calculate forward or backward from it.
Are public holidays excluded?
No. The current calculator treats holidays like any other calendar day.