All Post cereals have a code (or “Best Before”) date on the top flap of the box. For example, if the code date reads “17JN01,” the corresponding “Best Before” date is June 1, 2017. By referring to the Best Before date you can be sure the product you’ve chosen is at peak freshness at the time of purchase and for a reasonable period of time thereafter, when stored unopened in a cool, dry place. We cannot guarantee the freshness past the Best Before date code.