I've been using this calculation for years with V6 and earlier versions:

If(terms = "First of Month" , DateToText( Date(Month(Invoice Date) + 1,Day("1"),Year(Invoice Date))) ,If(terms = "Upon Receipt", Invoice Date ,If( terms = "30 Day", Invoice Date + 30, DateToText( Date(Month(Invoice Date) ,Day("15"),Year(Invoice Date))))))

When I converted to 8.5 the calculation changed to:

If(terms = "First of Month" ; GetAsText( Date(Month(Invoice Date) + 1;Day("1");Year(Invoice Date))) ;If(terms = "Upon Receipt"; Invoice Date ;If( terms = "30 Day"; Invoice Date + 30; GetAsText( Date(Month(Invoice Date) ;Day("15");Year(Invoice Date))))))

It returns a value of "?" instead of a due date.

I've been fooling around for the last 4 hours trying to fix this.

Any ideas?

If the calc's result is a Date, you should use getasdate() instead of getastext(). Also, you don't need to use Day("1") and Day("15"). You can use 1 and 15, respectively.

Case(terms = "First of Month" ; GetAsText(Date (Month ( Invoice Date )+1; "1" ; Right ( Invoice Date ; 4 ) )) ; terms = "Upon Receipt"; Invoice Date ;If( terms = "30 Day"; Invoice Date + 30; GetAsText( Date(Month(Invoice Date) ;Day("15");Year(Invoice Date)))))

try that as your Due Date Calc it works for me no problem

Answered here:

http://filemakertoday.com/com/showthread.php?p=56879

Thank you