Schedule C - Business use of car and date in service

This is our first year using TurboTax.  We keep track of business miles and write a reimbursement check from business funds at the end of the year.  In the past, our accountant put that amount on line 9 (Car and Truck Expenses) and left Part IV (Info on Your Vehicle) blank.  During TurboTax Review the program is asking for a date vehicle was placed in service. Do I need to fill this out?  If this vehicle has been used in prior years and I need to fill in Part IV, what date should I use? Thanks