Can you register a car before the expiration date?

If your talking about the expiration of the current registration then yes. It should state on your renewal paper that if you register on time, an amount, if by mail an amount, and you do have to register it according to the birthday of persons name on paper. I thought you had until the end of that month but that is not true. For ex) if your b-day is January 15th, you must register it on or before that date, anything after that you are in violation of registration and if you get pulled over will get a ticket.