What is the term used for the date by which perishable food should ideally be purchased?

The term used for the date by which perishable food should ideally be purchased is commonly referred to as the "Sell by" date. This designation is intended to guide retailers about how long they can display a product for sale. It is typically not an indication of the safety of the food, but rather a suggestion for optimal freshness. When customers see the "Sell by" date on a product, it implies that they should purchase it before that date to ensure quality and freshness, even if it might still be safe to consume for a short period after the date.

The "Use by" date is primarily concerned with safety and indicates the last date a product should be consumed for optimal safety. The "Best before" date is related to the quality rather than safety; it suggests when the product may begin to lose its flavor or nutritional value. The "Pack date" simply refers to when the product was packaged and does not convey any information on its freshness or safety for consumption. Understanding each of these terms is important for both retailers and consumers to ensure proper handling and consumption of perishable goods.