California Code, Code of Civil Procedure - CCP § 668.5

In those counties where the clerk of the court places individual judgments in the file of actions and either a microfilm copy of the individual judgment is made, or the judgment is entered in the register of actions, or into the court's electronic data-processing system, prior to placement of the judgment in the file of actions, the clerk shall not be required to enter judgments in a judgment book, and the date of filing the judgment with the clerk shall constitute the date of its entry.