>Is there an easy way to increment the month in a date type variable ?
>
>ex:
>
>ddate = {01/01/1998}
>
>ddate + ??? = {01/02/1998}
>
>thanks !

The GOMONTH function will do what you need. To move 1 month ahead

ddate = GOMONTH(ddate, 1)

The function is smart enough to deal with the differing number of days in the month. If you increment 1 month from January 31 it will return February 28 or 29, depending whether it's a leap year.