Excel =Date and Leap Years

Hello,

I am looking to add years and months to a date to obtain some final date. Like an expiration date.

However, I need it to factor in leap years which excel does not seem to do using the Date function unless I'm using it incorrectly.

I've created a sample of what I'm looking for using the expiration date example. Excel simply seems to add year to year, month to month, without considering leap years in between.

The format I am using is along the lines of:

=DATE(YEAR(A1+B1),MONTH(A1+B2),DAY(A1)) where A1 is the starting date and B1 and B2 are years and months respectively.