I guess I would consider this a hack but for items at the grocery store that usually have shorter expiration dates like breads, milk, fresh items, etc. I will dig out one from the back of the shelf to see if it has a longer date. Working years for grocery stores in HS and College I learned this as if the person stocking the shelf is doing it correctly they are supposed to pull the existing items of the shelf and stock the new inventory in the back and place the older inventory at the front of the shelf. Your average shopper will just pull the closest item from the shelf which is supposed to help rotate the inventory through before expiration.