MS Access - String to Date Conversion (Part II)

To whom it may concern,

Referrencing the attached file, I have been able to succesfully convert a string with the format ddmmyyyy to a date with the format mm/dd/yyyy, using the formula below. In the attached file, this is shown by converting the value in the Start Date field to the value in the New Start Date field. My sticking point, however, is the last cell of the column whereby I need to convert a value of mmddyyyy - mmddyyyy to a value of mm/dd/yyyy - mm/dd/yyyy. What formula can I use to accommodate the entire column?

I think this is a tough one, so any insight is extremely appreciated.

-Maroulator

IIf([Start Date]="No Existing Value","No Existing Value",Format(DateSerial(Right([Start Date],4),Mid([Start Date],3,2),Left([Start Date],2)),"mm/dd/yyyy")) AS [New Start Date]
Example.xlsx