According to a query to China Fine Wine, the date of production of Corona beer can be viewed on the label or bottle cap. Specifically, the label will usually have a row of numbers from 1-12 that represent the date, and 1-3 numbers on the lower edge of the label that represent the month. For example, the code "B9" means that the beer was produced in February 2019. In addition, the back of the cap will usually have the date of production in the form of a combination of letters and numbers, where the letters represent the month of production and the numbers represent the year of production. For example, the code "A9" means that the beer was produced in January 2019.
Corona Beer is a brand of beer from Mexico, produced by Modrow Brewing Company. It is a typical American-style pale lager, and is often listed among the top three imported domestic distributions, along with Fuchsia White and 1664.