How can a laptop be bought 1 and a half years "ago" I bought it last year in 2017 but the manufacturers date is 11/09/18 that

what make/model laptop?

can you show photos? not that I don't believe you but maybe its a date for something else?

if you take photos, upload them to an image sharing web site and show links here.

There should be a sensible explanation unless they are time travellers.
 
Time travel. 😀

For a long time, I believed duplicated MAC is impossible, and yet I've been proven wrong by a post. So they mess up the stamping, is not illegal, u can't sue them, unless is pharmaceutical.