Would this New DUI Law, mean DUI's after the law goes into effect or do previous Dui's count too?

Driving Under the Influence (AB 1601/Hill) Effective in January 1, 2012, this bill authorizes a court to order a 10-year revocation of the driver license of a person convicted of a third or subsequent DUI violation, with possible reinstatement after five years if specified conditions are met.