Question

while purchasing canned food its expiry date should be checked

Answer 1

yes, ofcourse................

Answer 2

Expiration dates are stamped on food packages as a way to keep consumers safe. You can become ill if you consume some foods, such as meat or dairy products, past their expiration dates, so it's important to pay close attention to the dates stamped on the foods. Canned goods are a little different, however, because the date on the can is technically a "best by" date rather than a hard-and-fast expiration date