On my 1099-B, the 1b (date acquire) field is blank. It doesn't have anything in it at all. When I try to leave that space blank n TurboTax, it tells me I must enter date

On my 1099-B, the 1b (date acquire) field is blank. It doesn't have anything in it at all. When I try to leave that space blank n TurboTax, it tells me I must enter date