California Code, Government Code - GOV § 6808

(a) The standard time within the state is that of the fifth zone designated by federal law as Pacific standard time (15 U.S.C. Secs. 261 and 263).

(b) The standard time within the state shall advance by one hour during the daylight saving time period commencing at 2 a.m. on the second Sunday of March of each year and ending at 2 a.m. on the first Sunday of November of each year.

(c) Notwithstanding subdivision (b), the Legislature may amend this section by a two-thirds vote to change the dates and times of the daylight saving time period, consistent with federal law, and, if federal law authorizes the state to provide for the year-round application of daylight saving time, the Legislature may amend this section by a two-thirds vote to provide for that application.