It possibly means March 17, 2009. If it were May, it might have been written "MY". But for an expiration date, that's not very clear. It could be a production date rather than an expiration. It might...
Over time, scientists have run tests to see how long food can last without growing mold, attracting pests, etc. The expiry date that is on a package is an estimate of that amount of time. However,...