Has anyone ever created payment terms that calculates the deadline from the end of the month date of

Hi!

Has anyone ever created payment terms that calculates the deadline from the end of the month date of invoice plus 30 or 60 calendar days?

I need to create these for an Italian law.

Examples:

30 DD:  invoice date 10/01 -->  due date 02/03  or 3/03 if leap year (31/01 + 30 DD)

             invoice date 10/02 -->  due date 30/03

             invoice dare 10/03 -->  due date 30/04

60 DD: invoice date 10/01  -->  due date 01/04  or 31/03 if leap year (31/01 + 60 DD)

            invoice date 10/02  -->  due date 29/04

            .... 

            invoice date 10/12  -->  due date 1/03   or 29/02  if leap year

            

invoice date as DDMM

Thank in advance.

Francesca