I'd like to create a formula in Excel that will calculate my products expiration date. Obviously, I'll know the manufacturing date that can be a calendar date in the form of : dd/mm/yy or julian date. The julian date would be 2310 w/ 2 representing the last digit of the year(2012) and 310 representing 11/5/12. My expiration date calculation will be either adding 330 or 150 to the calendar date or julian date. Help!