California Code, Business and Professions Code - BPC § 25633

Except as otherwise provided in this section, no person licensed as a manufacturer, winegrower, distilled spirits manufacturer's agent, rectifier, or wholesaler of any alcoholic beverage shall deliver or cause to be delivered any alcoholic beverage to or for any person holding an on-sale or off-sale license on Sunday or except between the hours of 3 a.m. and 8 p.m. of any day other than Sunday.Any alcoholic beverage may be delivered at the platform of the manufacturing, producing, or distributing plant at any time. Nothing contained in this section prohibits the transportation or the carriage and delivery in transit at any time of any alcoholic beverage between the premises of a manufacturer, winegrower, wholesaler, distiller, importer, or any of them. Every person violating the provisions of this section is guilty of a misdemeanor.