Notwithstanding Section 20471, and except as provided in subdivision (b) of Section 20469.1, approval of a proposed joint contract by a trial court and county shall be by ordinances or resolutions adopted by both the affirmative vote of a majority of the members of the governing body of a county and the presiding officer of the trial court, not less than 20 days after the latest adoption of the notices of intention. The resolution of the presiding officer of the trial court and the resolution or ordinance of the governing body of the county which approve the joint contract must be adopted within 30 days of each other.