The gift delivery date refers to the day you want to deliver the gift. Through this information, we will know when we can contact the gift recipient.
Suppose IQOS will be a birthday gift for someone born on March 12; by indicating that as the "gift delivery date," we will know that from the next day, we could contact the gift recipient to support them in registering the new device. In the case of an online purchase, please note that the "gift delivery date" will have to be set later than the expected delivery date of the order.