Well, when you right click on the scorll bar and go into format control, under the control tab it appears the cell link is B1. If you trace dependents for B1 it is linked to C9 and it appears most of the information in row 10 is linked to row 9 and it also appears that this formula (in C9) begins the process for the dates.
=(A6-WEEKDAY(A6,1)+B9)+7*B1
What is weird is I don't see anything in A6. However, if you put a date in there the scorll bar dates change.