Here is what I am using:
IIf(DateDiff("ww",[Date_ID],[Date_Closed])>1,(DateDiff("ww",[Date_ID],[Date_Closed]))-1,0)
This works great if there are no exceptions. As usual we have discovered an exception. What if I wanted to exclude a weeks time? I would gather if you have 2 different weeks time you would put an And in it. For now I need to exclude a week from this.
21 May 2015 to 27 May 2015.
Thanks