This is a very complex question. Different brewers have different codes. As simple as Budweiser's "born on date", and as complex as Asahi's letter A-M for month, next two digits are the day, final digit is the year. B139 would translate to February 13, 2009. Weihenstephaner's code is four digits, first one is day of month, second two are week of year, final is year. 7218 would be the 27th of May, 2008. Some brewers put a "best before date that you can actually read. Most have a secret code different from each other, so that only insiders can understand it. Stale beers, especially the wheat beers, Weizen, Weisbeers, Hefeweizen.. go bad without refrigeration in 8 weeks or so. If kept under 45F they will keep 8-9 months. They taste sour and bitter after time. If you have ever had a Heinikens that tasted "skunky" or like old tires, it is too old. Same goes for Corona, even though fresh it is a little skunky.
Budweiser beer in the US has an expiration date of about 3 months for bottles and cans and about a month for keg beer. The taste deteriorates quickly after the date, and much quicker if exposed to heat or sunlight.
In New Zealand its printed on the bottom of the can. But every country could be different...
It's a code number identifying the canning facility, the date, and the batch.
Actually that little ball at the bottom of a guiness beer can is called a "Widget".
1020528e0426
Lager beers are bottom fermented.
Satisfaction.
It varies.
shotgun
Yes it does.
Glasses don't have expiration dates, but beer bottles might.
Bring it to the attention of the seller.