According to the, the shelf life of milk is affected by several factors, including how it is handled before and after it is purchased. When stored at 40 degrees Fahrenheit and not left out of the refrigerator for extended time periods, milk should last approximately five to seven days past the 'sell by' date.' The type of cheese contributes to its shelf life. Soft cheese (cream cheese) will last up to two weeks, whereas a medium or hard cheese (cheddar) can last three to six months. Reports that the dates on egg cartons are not food expiration dates, but guidelines. Raw eggs can stay good for approximately three to five weeks after the date of purchase as long as they are not cracked or damaged. Baked Goods and Snack Foods Baked goods and snacks typically have a Use-By Date.
Store-bought bread will typically last five to seven days at room temperature, but can last one to two weeks in the refrigerator. Fresh-baked bread do not contain preservatives, so they typically won't keep as long as commercially packaged breads. If the date on your bread or snacks has expired, it does not mean they have not gone bad. In fact, once something something goes stale it means that it has been depleted of moisture, which makes it less likely to grow mold. Try storing it in a plastic bag for extended shelf life. Snack foods contain preservatives in order to maintain shelf life.
Different types of snacks have varying expiration dates: Potato chips will last one month after expiration date. Crackers and pretzels can last up to three months. One of the longest lasting snacks is popcorn, which has a shelf life of one to two years. There is a myth that Twinkies can last upward of 50 years. However, this is urban legend. Twinkies can last for a lengthy 25 days without packaging, because dairy products are not a part of the recipe.