Just recently saw six-month-old Tiger beer around town, beach side and Darkside, bottled in February. Twice it tasted awful and I returned it to the lady owner. She had bought leftover beer stock from a bar closing down. It was truly disgusting. Got Leos as a substitute. To be honest, never had a spoiled Leo. Of course, Leo outsells Tiger so likely fresher.
In the recent past, i.e., pre-pandemic, I could not believe how awful the Tiger was at times. The Tigers at a selection of 7s, Lotus and bars all came with fill dates of six months past.
Here in Bangkok, haven't had a bad Tiger beer in years. I am guessing Pattaya bars get the brewery rejects at a discount since Pattaya margins are so small.