Count Full Weeks Monday Through Sunday Between 2 Dates

Another thread that wanted to count "weekends" got me to thinking about this one:

Count the full weeks (from Monday thru Sunday) between 2 dates.

For example...

Data Range

A
B
C
D
E
F

1
Date
Weekday
------
Start
End
Weeks

2
8/1/2013
Thu

8/1/2013
8/15/2013
1

3
8/2/2013
Fri

[Code] .........

Full Monday thru Sunday weeks = 1

This array formula** entered in F2:

=(MAX(IF(WEEKDAY(ROW(INDIRECT(D2&":"&E2)),2)=7,ROW(INDIRECT(D2&":"&E2))))-MIN(IF(WEEKDAY(ROW(INDIRECT(D2&":"&E2)),2)=1,ROW(INDIRECT(D2&":"&E2))))+1)/7

** array formulas need to be entered using the key combination of CTRL,SHIFT,ENTER (not just ENTER).

Hold down both the CTRL key and the SHIFT key then hit ENTER.

The logic of the formula is:

The max Sunday date within the date range minus the min Monday date within the date range +1 = total days divided by 7 (days in a full week) = full weeks