Yes to close a short sale you buy securities. Other than that your response is not at all correct, but valiant attempt.
A short sale has acquisition and disposal dates swapped from a long sale, that is all. The date disposed is always on or before the date acquired because you are selling the item and then purchasing it to cover later. It has little to nothing to do with weekends or 1-3 day waiting periods.
Edit: Reading the form instructions indicates that I am incorrect, the date for short sale in column b will be the date of the buy-to-close transaction and in column c would be the actual delivery date of the purchased security.
