Question 1

What date is 9 months after May 31?

Accepted Answer

9 months after May 31 is February 28.

Question 2

Is 9 months after May 31 always the same?

Accepted Answer

Yes — for a given month and day, 9 months forward consistently lands on February 28. Edge cases (like adding 9 months to January 31) clamp to the last valid day of the result month.

Question 3

What is 9 months before February 28?

Accepted Answer

9 months before February 28 brings you back to May 31.

9 Months After May 31

February 28