California can’t stop daylight saving time on its own because federal law gives states only two choices: keep changing clocks twice a year or move to permanent standard time. The option most Californians want — permanent daylight saving time, with later sunsets year-round — is prohibited by the Uniform Time Act of 1966 and would require Congress to change the law. Voters approved Proposition 7 in 2018 to let the legislature act, but that authority only matters once Washington opens the door.
Proposition 7 Unlocked the Door but Didn’t Open It
Before 2018, the California legislature had no power to touch the state’s daylight saving rules. Voters had set those rules themselves through Proposition 12 back in 1949, so any change required another ballot measure. Proposition 7 removed that lock, passing with roughly 60 percent of the vote and giving the legislature authority to change daylight saving time by a two-thirds vote, so long as any change complied with federal law.1Legislative Analyst’s Office. Proposition 7 – Daylight Saving Time
That final clause is the whole problem. Proposition 7 didn’t move California’s clocks by a single minute. It handed lawmakers a tool and told them to use it within federal limits. The use most voters had in mind — permanent daylight saving time — is the one use federal law forbids. Assembly Bill 7, introduced in 2019 to establish year-round DST, stalled against that wall. Later bills met the same end.
What Federal Law Actually Allows
The Uniform Time Act gives every state a binary choice. A state can observe daylight saving time on the federal schedule, with clocks advancing one hour at 2:00 a.m. on the second Sunday of March and falling back at 2:00 a.m. on the first Sunday of November. Or a state can opt out and keep standard time year-round, provided the entire state does the same.2Office of the Law Revision Counsel. 15 USC 260a – Advancement of Time or Changeover Dates
There is no third option. A state cannot adopt permanent daylight saving time under current federal law. The statute explicitly says Congress intends “to supersede any and all laws of the States” that set different advancement schedules.3U.S. Government Publishing Office. Uniform Time Act of 1966 Arizona and Hawaii have taken the opt-out and stay on standard time permanently, as do five U.S. territories. But standard time means earlier sunsets in summer, which is the opposite of what most reformers want.
Why Congress Hasn’t Changed the Rules
The only route to permanent daylight saving time in California runs through Congress amending the Uniform Time Act. The U.S. Senate unanimously passed the Sunshine Protection Act in March 2022 to do exactly that, making DST permanent nationwide. The bill then died in the House without a vote. Representative Vern Buchanan of Florida reintroduced it as H.R. 139 in January 2025, and it was referred to the House Committee on Energy and Commerce.4Congress.gov. H.R. 139 – Sunshine Protection Act of 2025 As of early 2026, it has not advanced.
California is not alone in waiting. Nineteen states have passed legislation to adopt permanent daylight saving time, and every one of those laws is contingent on federal approval.5National Conference of State Legislatures. Daylight Saving Time State Legislation Florida led in 2018, followed by Washington, Oregon, Tennessee, and most recently Texas in 2025. None have actually changed their clocks.
The 1974 Memory That Still Haunts Capitol Hill
Congressional reluctance has a specific origin. During the 1973 oil crisis, President Nixon signed the Emergency Daylight Saving Time Energy Conservation Act, putting the entire country on year-round DST starting in January 1974. Public approval ran around 79 percent at the outset. Within months it collapsed to 42 percent.
The problem was winter mornings. In northern states, children were walking to school in the dark. In Florida, eight children died in early-morning traffic accidents during the first weeks of the experiment, compared with two deaths during the same period the previous year. Critics began calling the policy “daylight disaster time.” Congress ended the trial in October 1974, ten months into what was supposed to be a two-year run. That episode still shapes how lawmakers approach permanent-DST bills, even as supporters argue that modern conditions make the comparison outdated.
The One Path California Could Take Alone
California does have a route that doesn’t depend on Congress: permanent standard time. The Uniform Time Act’s opt-out already permits it, and the legislature could use the authority Proposition 7 granted to make the move with a two-thirds vote.2Office of the Law Revision Counsel. 15 USC 260a – Advancement of Time or Changeover Dates
Senate Bill 1197, introduced in the 2025–2026 legislative session, would do exactly that. It proposes repealing daylight saving time in California and placing the entire state on year-round standard time, with a fallback provision that would switch California to permanent DST if Congress ever approves it nationally. The bill cites endorsements from the California Medical Association, the California Sleep Society, and the American Academy of Sleep Medicine, which have recommended permanent standard time over permanent DST on the grounds that standard time better aligns with natural circadian rhythms.6LegiScan. California Senate Bill 1197
The obstacle here isn’t legal; it’s political. Permanent standard time means earlier summer sunsets. In Los Angeles, a late-June sunset would land around 7:00 p.m. instead of 8:00 p.m. For a state whose public life leans heavily on long summer evenings, that is a difficult sell, even when the medical community says it is the healthier choice.
The Two Paths Out
California has two ways to stop changing its clocks, and each has a real barrier.
- Permanent daylight saving time requires Congress to amend the Uniform Time Act, most likely by passing the Sunshine Protection Act or something similar. Only then could the California legislature use its Proposition 7 authority to lock clocks forward. Since the Sunshine Protection Act has failed to clear the House twice despite Senate approval, this path depends on momentum California cannot control.
- Permanent standard time can happen by state action alone. The legislature can pass it with a two-thirds vote under the existing federal opt-out, and SB 1197 is a live vehicle. The barrier is voter preference, not law. Most people who supported Proposition 7 wanted more evening sunlight, not less.
Until one of those paths breaks through, California stays in a holding pattern, observing a schedule most of its voters have said they want to change, blocked by a federal law written in 1966 and a political memory from 1974.