Daylight saving time should be permanently abolished in the United States

The question is whether the United States should replace seasonal daylight saving time with year-round standard time, weighing the value of ending clock changes and maintaining solar-time alignment against the value some people place on later evening daylight. The claim concerns permanent standard time, rather than the distinct alternative of permanent daylight saving time. The strongest case for abolition is that it would eliminate the recurring clock transitions associated with sleep disruption and short-term adverse health outcomes, including a modest post-spring-transition increase in myocardial-infarction incidence reported across observational studies and meta-analytic research. Traffic evidence is less uniform, but reviews identify plausible short-term risk from spring sleep loss and circadian disruption, and a U.S. before-and-after study found more fatal crashes in the days following the spring change. Year-round standard time has a separate health-policy rationale because expert commentary and a systematic review favor it over permanent DST as the option more closely aligned with local solar time while also ending seasonal shifts. That distinction matters because permanent DST would stop the clock changes but retain an approximately one-hour displacement of social time from solar time. Energy conservation provides only a limited general justification for retaining seasonal DST because natural experiments in Australia and Indiana found that increased morning or heating-and-cooling demand could offset, or exceed, evening lighting savings. The policy is also administratively recognizable: federal time policy permits states to exempt themselves from DST and remain on standard time year-round. The strongest counterargument is that later evening daylight under DST can yield a real public-safety benefit: a U.S. study found reduced robbery during the hours affected by the additional evening light. Localized observational research also suggests that later daylight may redistribute recreation, retail activity, or consumer spending, although it does not establish a large national welfare effect. The magnitude of the health and crash gains from abolition remains uncertain because the underlying studies are largely observational, traffic findings are mixed, and estimates may be affected by seasonality, weather, travel patterns, outcome definitions, and other behavioral changes. Energy effects also cut against a categorical conclusion because their direction varies by climate and household demand, meaning abolition could forgo savings in settings where later daylight reduces electricity use. The evidence more clearly supports ending biannual clock changes than it resolves the broader distributional choice between prioritizing morning light through standard time and preserving later evening light through DST. Transition-related harms are the most directly avoidable consequence of the present system, but heterogeneous methods, populations, outcomes, and estimates prevent precise national projections of the benefit from permanent standard time. Energy consequences should be expected to vary geographically rather than to determine a uniform national answer, since the available natural experiments reach different results in different climates and demand settings. The principal evidence gap is the limited direct evidence comparing a nationwide, permanent-standard-time United States with the current seasonal system. Much of the record instead infers policy effects from transition studies, localized natural experiments, registry analyses, and research on particular outcomes such as robbery, crashes, or electricity demand. The bundle also does not quantify how benefits and burdens would be distributed across regions, occupations, school schedules, or people with differing preferences for morning versus evening daylight. On balance, the evidence supports abolishing seasonal DST in favor of permanent standard time, with high confidence in the direction of the case but lower confidence in the size of its net national benefit. The decisive considerations are removal of recurring transition-related disruption and the solar-time rationale for standard time; the main counterweight is the loss of some later-evening-light benefits, especially the observed reduction in robbery during affected hours. The dominant uncertainty driver is that the available evidence does not directly measure the full, nationwide consequences of the proposed permanent-standard-time policy.