California Code, Elections Code - ELEC § 1415

(a)(1) Except as provided in paragraph (2), a city or city and county charter proposal proposed by the governing body of a city or city and county on its own motion that qualifies pursuant to Section 9255 shall be submitted to the voters at the next established statewide general election pursuant to Section 1200 occurring not less than 88 days after the date of the order of election.

(2) The governing body of a city or city and county may direct that either of the following be submitted to the voters at the next regularly scheduled general municipal election pursuant to Section 1301, or at any established statewide general or statewide primary election pursuant to Section 1200 or 1201, occurring not less than 88 days after the date of the order of election: