EXAMPLE FILE:
example.xlsx

I have a file with:
- 2 columns: Column 1 = start date, Column 2 = end date
- one column per quarter (Column3 = Q3 2013, Column 4= Q4 2013, etc)

I need to color cells in quarter columns grey if the quarter in a particular column falls out of the date range in Column 1 and Column 2.
For example: Col1=8/1/13, Col2=9/1/13
since the date range is in Q3, cell in Q3 column will stay white, while Q4 column will be colored grey since Q4 is outside of the specified date range.

The date range could span multiple quarters.

Please see attached example.

Any help would be greatly appreciated!