The date of production can be seen on the seal of the package or the bar code of the package. According to Zhihu's inquiry, the production date and shelf life of Kochi shower gel are marked on the outer packaging box or bottle, and the production date of some cosmetics will be marked on the bottom of the bottle. You can also use WeChat to scan the barcode on the product package, enter the product details page, or inquire about the production date.