Here's a formula that will convert the data to a valid date of 08/27/60.
=Date (1900+Value (Left (Str (A1),2)),Value (Mid (Str (A1),3,2)), Value (Right (Str (A1),2)))
By means of explanation.
The Left (), Right () and Mid () functions are used to strip out values in certain positions.
These functions require a text value, so the Str () function is used to convert the numbers to text.
The Date () function, however, requires numbers as arguments, so the values returned by the Left (), Right () and Mid () functions need to be converted back to numbers by use of the ValueÊ() function.