Too Long; Didn't Read
In November 2018, California passed Proposition 7 which repealed the Daylight Savings Time Act of 1949 that approved the clocks in California to stay in sync with the clocks at the state level. This is the first step in allowing California to either cancel (sensibly) DST changes made at the federal level with DST, or with Arizona and Hawaii, staying DST would be a bad idea altogether. DST wasn't formally adopted by anyone until WWI in 1916 as a way to conserve coal, but again, this only controlled behavior.