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i'm pretty sure this is common knowledge based on what expiration dates are.
also remember that the expiration dates are not only for the contents, but for the overall product. this includes the packaging.
for instance, there are some foods that will stay good nearly forever ... but the packaging is actually more fragile than the food itself, and the packaging can break down/fail if unused after a prolonged amount of time
"Best before dates" are advisory.
"expiration dates" can be quite important. >

Best before dates are usually guidelines for stores to take products off their shelves. An unacceptable percentage of the food will degrade in taste, texture, or appearance after that date. Depending on the product, the food is still edible for days, weeks, months, or years after their best before date.
Expiration dates are usually associated with products like drugs or baby seats, and the safety or effectiveness of the product has been reduced to an unacceptable level. It may still be safe or effective but the manufacturer or government has no more confidence in the product. >

Today I learned that baby seat have expiration date.
Very thanks. >

As I like to say - it's best by, not absolutely deadly at. 
Many things are good past the date, just look - smell - taste. If all 3 are fine you are most likely good to go, deapite whatever the date says. Only few things I'm careful with - e.g. meat. But also off meat is usually easy to detect. >

Canned food and spices last a very long time, if you use them frequently enough to normally use them well-past expiration date then you are buying way too much. >

How does your chewy milk taste? >

Expiration dates are only true to baby food >

It's CYA >

Eating yes (or possibly) selling, NEVER.