hi Hygienic,
sorry perhaps I haven't been clear enough

:
2 criterias for an expiry date :
- the food safety : we, as a company, certify that the product is ok for the consumption until MM/DD/YYYY
- and : this date also certify that the gustative elements and the taste of the products (for example development of rancid odour) is ok until the above date
For fresh products we can have 'use by' (for delicatessen) and 'BBE' (for cheese for example). In this case usually the first criteria is the most important.
For cans, dry, frozen products : shelf lifes are quite long (12-24 months usually). The microbiological criterias don't change a lot for this period - of course if the process+
Haccp study has been respected. Most of the time (and I don't know if we have some other info for some products) we have a BBE.
So the most important criteria is the second one (no evolution in the taste). To me the expiry date noted on the product is mainly an indication about the best use of the product.
Last, for few years you also have a BBE on cosmetic products - quite recent. I don't think that for this kind of products before having this information people were ill because of a skin cream beyond the BBE...because there wasn't. But the actual info allows us to know if the product is 'quite old' or 'too old' - 3 months beyond or 5 years beyond is not the same thing,
I refer to the french legislation and french terms; perhaps not the same info and perception in other countries; in this case please do not hesitate to give further info!
Regards,
Emmanuel