California Code, Vehicle Code - VEH § 13352.6

(a) The department shall immediately suspend the driving privilege of a person who is 18 years of age or older and is convicted of a violation of Section 23140, upon the receipt of a duly certified abstract of the record of a court showing that conviction.  The privilege may not be reinstated until the person provides the department with proof of financial responsibility and until proof satisfactory to the department, of successful completion of a driving-under-the-influence program licensed under Section 11836 of the Health and Safety Code has been received in the department's headquarters.  That attendance shall be as follows:

(b) For the purposes of this section, enrollment, participation, and completion of the program shall be subsequent to the date of the current violation.  Credit for enrollment, participation, or completion may not be given for any program activities completed prior to the date of the current violation.