I thought there was a sticky on reading the date on various brands of bleach, but can't find it. Three brand that I have convenient access to are Pool Essentials (WalMart), HDX (Home Depot) and HTH (Ace Hardware).
I can't speak to the Ace Hardware brands, but I've seen the dates on Pool Essentials and HD's pool chlorine. Julian Date format near the handle. Something like "19 121" which would have been 1 May 2019.