"Use-by" dates usually refer to best quality and are not safety dates.
Even if the date expires during home storage, a product should be safe, wholesome and of good quality if handled properly.
For example, if hot dogs are taken to a picnic and left out several hours, they will not be safe if used thereafter, even if the date hasn't expired.
"Sell by Feb 14" is a type of information you might find on a meat or poultry product. Does it mean the product will be unsafe to use after that date?
Here is some background information which answers these and other questions about product dating. "Open Dating" (use of a calendar date as opposed to a code) on a food product is a date stamped on a product's package to help the store determine how long to display the product for sale.