Calculate Workflow Custom Task Due Date without weekends?

Question

I'd like to set the value of "Due Date" on "Create Custom Task" within my workflow.

However, I want it to be "weekend aware"...i.e. (Sunday-Thursday working week)
if you create a task on Sunday to Tuesday then its due 2 days later
if you create a task on a Wednesday then its due Sunday
if you create a task on a Thursday then its due Monday

I have looked at workflow variables, but these don't have calculations.
I have looked at "Do Calculatation" but this is very restricted to "add a fixed number"

[Yet again, a simple task in SharePoint proves to be difficult]

Answer 1

It's not as simple as one could wish, but you can do it by using the following actions as building blocks:

• Use Find Interval Between Dates to get the number of days from a know date to the create date
• Use Do Calculation (mod 7) to get the week day of the create date
• Use a series of if any value equals value togetter with Add Time to Date to calculate the due date

Answer 2

Without custom code, I can see no way of doing it on with de SPD.

Best regards.