Cal. Government Code § 71645

(a) On and after the implementation date of this chapter, this article shall become the employment, selection, and advancement system for all trial court employees within a trial court and shall become part of the sole trial court employee system, replacing any aspects of county employment, selection, and advancement systems applying to trial court employees prior to the implementation date of this chapter. (b) Except as provided in subdivision (c), the implementation date of this chapter for each trial court shall be the effective date of this chapter. (c) The representatives of the trial court and representatives of recognized employee organizations may mutually agree to a different implementation date. If the provisions in this article are governed by an existing memorandum of understanding or agreement covering trial court employees, as to such provisions, the implementation date shall be either the date a successor memorandum of understanding or agreement is effective or, if no agreement for a successor memorandum of understanding or agreement is reached, 90 days from the date of the expiration of the predecessor memorandum of understanding or agreement, unless representatives of the trial court and representatives of recognized employee organizations mutually agree otherwise.