The production date of Givenchy lipstick can be seen at the bottom of the shell. It is a 4-digit batch number consisting of letters and numbers. The first digit indicates the year, such as "8" indicating 2018; The second letter indicates the month, and the letter of the month begins with n, where N= 1, P=2, Q=3, R=4, S=5, T=6, U=7, V=8, W=9, X= 10 and y = 65430. The last two digits indicate the specific date. How long is the shelf life of Givenchy lipstick? Givenchy lipstick has a shelf life of three years in unopened condition and can be used for one year after opening. If you use expired lipstick, it will not only affect the moisturizing degree of lips, but also may cause card marks, so you need to pay attention to the shelf life of lipstick. The way to judge whether lipstick is expired is: besides looking at the date of production, you can also judge whether lipstick is expired by smelling it. Under normal circumstances, lipstick will have a faint fragrance during the shelf life, but expired lipstick will oxidize over time and produce sour taste; In addition, you can also judge whether lipstick has expired by the change of color. Lipstick will come into contact with air when used for a long time, and it will turn yellow and dark.