Being serious for a minute.
I tend to check the date on items when I go grocery shopping (and, I do 90% of the grocery shopping). You would be surprised how some big name retailers have problems with rotating their shelf stock, not to mention the items in the dairy section. I was in a major chain grocery store just last week and found eggs two day past the sell by date and bottled fruit juice with a "Best By Date" of 7/12/17.
I went and found the "manager" and showed him the fruit juice and he said that was the date it was bottled and not the sell by date. I've been working with grocery stores for almost 20 years creating their advertising circulars. I told him he could restock the basket I was pushing because I wasn't shopping at his store anymore.
For the record. Aging cigars, pipe tobacco and wine is good. Aging cheese and some beef before it goes to the market is good. Keeping dairy products and grocery products on the shelf beyond the sell by or best by dates is not good.