Save file with creation date

Hello,

I've added row 23-27 to my code to save the active sheet with the created date and time  stamp from the file that was used to import sheet one. It's bugging out on row 27. The file will save if I "Dim asof As Long" but the result is not what I require.

Sub ImportSheet()

        Dim fileName
        Dim wb As Workbook
        Dim strPath As String
        Dim fs, f
        Dim asof As String
        

        fileName = Application.GetOpenFilename("Other Workbook (*.xl*),*.xl*")
        If fileName = "False" Then
        MsgBox "You have not selected a file. Please try again."
        GoTo QuitSub
        End If
        Set wb = Workbooks.Open(fileName:=fileName)
        With ThisWorkbook
            wb.Worksheets(1).Copy After:=.Worksheets(.Worksheets.Count)
            wb.Close False
            .Activate
            .Worksheets(.Worksheets.Count).Select
        End With
        
        Set fs = CreateObject("Scripting.FileSystemObject")
        Set f = fs.GetFile(fileName)
        asof = f.DateCreated
        strPath = ThisWorkbook.Path
        ActiveWorkbook.SaveAs strPath & Application.PathSeparator & "Data as of " & asof
        
        
QuitSub:
End Sub

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