Everyone Agrees to Stop Changing the Clocks. The Fight Is Which One to Keep.

Nobody is still defending the twice-yearly switch

Twice a year the United States moves its clocks, and almost no one with a position still defends the practice. The live proposal, the Sunshine Protection Act, is usually described as making daylight saving time permanent, but its text does something more specific. It repeals the seasonal daylight-saving period written into the Uniform Time Act of 1966 and advances standard time by one hour in every zone, so that the clock reading now called daylight time becomes the new, year-round standard.¹ The bill adds no daylight; it relabels which hour of sun the clock points at. Freeze the clock forward and the sun sits overhead an hour after noon; freeze it where it stands in winter and sunrise comes an hour earlier. Everything in the dispute rides on that one hour.

What almost everyone agrees on is that the switching should stop. Where the agreement ends is which time to keep. Polling reported by the newsletter Tangle finds that roughly two-thirds of Americans want some permanent time, but that the majority splits, with about 40 percent favoring permanent standard time and about a third favoring permanent daylight time.² The consensus that makes the twice-yearly change look doomed hides a real disagreement underneath it, and the two answers pull in opposite directions.

It helps to clear away the reason the clock was first moved. Daylight saving was sold in 1918 and again in the 1970s as an energy measure, and that rationale is spent. The Department of Transportation's 1975 review and the National Bureau of Standards' 1976 follow-up, summarized by the Congressional Research Service, found the energy effect negligible, a conclusion both camps now accept.³ The argument that remains is not about kilowatt-hours. It is about bodies and business: whether the country should protect the light of its mornings or the light of its evenings. The case for each is made, at full strength, by people who have staked their names on it.

The loudest evidence answers a different question

Set the two cases side by side, and much of the loudest evidence answers a question no one is asking. Take the economic claim. The number that circulates for a daylight-time spending boost, a 3.5 percent change in card spending, comes from a 2016 JPMorgan Chase Institute study of more than 380 million transactions.¹² Read past the headline and the study points the other way: daylight time's start raised per-capita card spending in Los Angeles by only 0.9 percent, while the 3.5 percent is the size of the drop when daylight time ends in the fall, and the Institute states, in its own words, that the pattern "does not support consumer spending claims of DST advocates." The camp's most-cited economic source is the one that most directly declines to support it.

The safety claim fails in a different way: it is true on both ends of the day at once. The Insurance Institute for Highway Safety, which owns the crash data and belongs to neither camp, told the same 2025 hearing that switching to daylight time produces a net decrease of 26 fatal crashes involving pedestrians or cyclists each year and a net increase of 29 fatal crashes involving vehicle occupants, an extra hour of light on one end of the day paid for with an extra hour of darkness on the other.¹³ Its conclusion is a refusal: the data "does not point to a preference for standard time or daylight saving time based on road safety alone." The other safety figure both sides reach for, a rise of up to 6 percent in fatal crashes, is real but belongs to neither permanent time. It is the spike in the days just after the spring clock change, a harm of the transition itself, and the sleep researchers who cite it use it to argue for ending the switch, which both camps already want.⁷

Even the strongest pieces of each case carry an asterisk the advocates tend to drop. The 1974 collapse is genuine as politics, but the causal claim is softer: the National Bureau of Standards could not definitively attribute the winter morning deaths to daylight time, and the experiment was tangled up with an energy crisis that no longer applies.³ The standard-time camp's own position statement concedes, in writing, that "one report suggested that DST may be associated with a decrease in crime rate," which is the robbery finding surviving inside the opposing brief.⁷ And the industry whose revenue most clearly favors daylight time will not actually endorse it: the golf owners' association "does not take a formal position," because a healthy portion of its members prefer the status quo.⁵

Strip out every claim that only argues for ending the switch, and the transition harms, the annoyance, and the spring crash spike fall away, because none of them chooses between the two permanent clocks. What remains does not turn on a fact that a single study could settle. It turns on which daylight a person values more: the winter morning that circadian science says the body needs to wake, and that a rural parent needs in order to send a child to school in the light, or the winter evening that the after-work economy is built on and that a majority told pollsters, in 1974 and since, they would rather have.² The observation that would move an undecided reader is not another spending estimate; it is a permanent-time experiment run long enough to measure a full winter of mornings, and the closest thing the country has to that is 1974, which ended in a single season. Until someone runs it again, the country is not weighing two accounts of the same evidence. It is choosing whose hour of daylight to protect, and the clock cannot protect both.