The expiration date is determined based on the ingredient with the shortest remaining shelf life. This means that the expiration date is calculated from the date on which the ingredient with the soonest expiration date was added to the product.

For example, if a food product contains multiple ingredients with varying shelf lives, and one of the ingredients is set to expire on March 1st, 2023, while the others expire later, the expiration date of the product would be set to March 1st, 2023. This ensures that the product is consumed before the ingredient with the shortest shelf life spoils, reducing the risk of foodborne illness or degradation in product quality.