About the date calculator
Use the date calculator to work out deadlines, due dates, anniversaries and expiry dates. Years and months are added first (clamping to the last day of the month when needed, so January 31 plus one month is the end of February), then weeks and days.
Formula
Result = start date ± (years × 12 + months) months ± (weeks × 7 + days) days.
Frequently asked questions
What is 90 days from today?
Set Operation to Add and Days to 90. The result is shown with its weekday.
How are months added?
The same day of the month is kept. If it does not exist in the target month, the last day of that month is used.