The value in the cell is 2008-11-29

Why then does this code return a false? 

If ActiveSheet.Cells(6, 8).Value > Mid("16800EBHRxx21Nov08-001.JPG", 12, 7) Then
    ActiveSheet.Cells(11, 11) = "PPP"
End If
If I switch the cell reference to 

Mid("16800EBHRxx29Nov08-001.JPG", 12, 7)
It returns a True.

Is there a certian date format I can use that will be recognized as such by both the worksheet, and the VBA macro?