The expiration date on the labeling of the manufacturer’s prescription drug container is 12/20. The pharmacist dispenses the prescription on 3/21/19 in the same container; however, the pharmacy labels the expiration date as 3/21/20. The patient asks the pharmacist why the dates differ. What explanation should the pharmacist provide? Is the date the pharmacist included on the label proper? What if the drug was dispensed in unit dose containers?