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1. Declare the necessary variables and open the CSV file:
   
   Formula:

   Dim excel As Microsoft.Office.Interop.Excel.Application
Dim wb As Microsoft.Office.Interop.Excel.Workbook
Dim ws As Microsoft.Office.Interop.Excel.Worksheet
Dim range As Microsoft.Office.Interop.Excel.Range

excel = New Microsoft.Office.Interop.Excel.Application
wb = excel.Workbooks.Open(FileName)
ws = wb.ActiveSheet
range = ws.Range("A:A") 

2. Set the column width:
   
   Formula:

   range.ColumnWidth = 15 

3. Set the date format:
   
   Formula:

   range.NumberFormat = "m/d/yyyy" 

4. Save the changes to the workbook, close it, and quit Excel:
   
   Formula:

   wb.Save()
wb.Close()
excel.Quit() 


Note that this code assumes that the CSV file has been opened in Excel and saved as an Excel workbook (.xlsx). If you need to open and format a true CSV file, you may need to use a different approach.