How do I know if the perfume (and sometimes cosmetic) is expired? ?

Very often I cant find the production info (Manufactured date and expired date) on the perfume bottle. How should I know if the perfume/cosmetic is still usable?How do I know if the perfume (and sometimes cosmetic) is expired? ?
Well the thing is that these products don't come with an expiration date on them..... Cosmetics, if it smells bad or burns throw it out. Mascara goes bad first, but other stuff can last forever as long as it's kept clean. With perfumes, they last about 3 years after they are made. If it seems like it's been sitting on a shelf and is dusty.. don't buy it. It's best to buy from Sephora since they always send you new bottles. If the perfume debuted this year, it was made this year. Often websites will tell you when it was made and since then, most companies make more. That is only a copyright.How do I know if the perfume (and sometimes cosmetic) is expired? ?
Cosmetics companies say you should change your cosmetics every six months. As for perfume, just go for how it smells, when it smells a bit pungent then get a new one.





EDIT As long as you buy perfume from a reputable shop, you don't have to worry. Its illegal for them to put expired items out. its only if you buy it from a market stall etc that its likely to be dodgy (and fake!)
` the scent sometimes is a good idea
if it doesn't have the expiration date on it, don't buy it !!!!!!!!!!!!!!!!!!!!!!! it's safer !!!