Date of production of Wang Laoji

Does the subject want to ask "where can I find the production date of Wang Laoji"? Bottle cap, bottle bottom. According to Wang Laoji's inquiry in official website, Wang Laoji's production date is marked on the bottle cap and bottom. Wang Laoji is a brand of herbal tea, founded in 1828, founded by Wang Zebang, and is recognized as the ancestor of herbal tea. The product form of this brand has changed in carriers such as water bowl herbal tea, herbal tea bag, herbal tea powder and herbal tea beverage.