1/. Your sheet "Raw Data" column "Case Opened" does't have dates!
You have somehow managed to convert this column to a string.
In a spare sheet put this in A2
Drag down to Row 1019
Copy the result and Paste Special > Values to sheet "Raw Data" P2 ("Case Opened")
Format the column
Format Cells > Number Format > Custom
Type:=
2/. Your formula in Sheet2 B2 has an extra anchor, it should be
3/. If you don't need this to work with 2003 and earlier, remember you can use COUNTIFS() instead of SUMPRODUCT()
See this workbook
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