Your chocolate-covered peanut stuffed dates can last in the refrigerator for up to 5 days. Remember to store them in an airtight container, and avoid overcrowding or stacking too many in the same container, or they’ll turn into one big mushy mess.  Freezing these dates is a possibility, but you’ll first need to freeze them until they’re solid and then transfer them to a container or a freezer-safe bag.