California Code, Elections Code - ELEC § 9255

(a) A charter or charter amendment proposed by a charter commission, whether elected or appointed by a governing body, for a city or city and county shall be submitted to the voters at an established statewide general election pursuant to Section 1200, provided there are at least 95 days before the election. A charter commission may also submit a charter pursuant to Section 34455 of the Government Code.

(b) Except as provided in paragraph (2) of subdivision (a) of Section 1415, the following city or city and county charter proposals shall be submitted to the voters at an established statewide general election pursuant to Section 1200, provided there are at least 88 days before the election:

(c) The following city or city and county charter proposals shall be submitted to the voters at an established statewide general, statewide primary, or regularly scheduled municipal election pursuant to Section 1200, 1201, or 1301 occurring not less than 88 days after the date of the order of election:

(d) Charter proposals by the governing body and charter proposals by petition of the voters may be submitted at the same election.

(e) The total number of registered voters of the city or city and county shall be determined according to the county elections official's last official report of registration to the Secretary of State that was effective at the time the notice required pursuant to Section 9256 was given.