Pay no attention to the "Sell By" date on your carton -- it's meant to help retailers manage turnover and isn't a measure of freshness. Eggs should keep for three to five weeks in the refrigerator.
Boxes typically come printed with a "Best Before" date, but it's a conservative estimate set by manufacturers for peak quality. Those Cheerios can stay fresh for up to three months if you refold the inner bag tightly.
Store your favorite reds in the fridge (place them in a plastic bag; poke a few holes to allow air to circulate), and they'll still be good to eat three weeks later.
You can keep unopened packages of sandwich meat in your fridge for two weeks -- even if the "Sell By" date has come and gone.
Ignore the "Best By" or "Sell By" date. Placing your loaf in the fridge can extend freshness by two weeks.