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Speculative theory

Daylight Saving TimeAtlas

Conventions & Standards · Timekeeping & calendars

The Standard Time Act established federal time standards in the United States and introduced daylight saving time during World War I. Common public claims about why daylight saving time was created or what it achieves are frequently disputed by historians and public-health researchers.

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Timeline

  1. 1918-03-19 · eventU.S. Standard Time Act signed into law
  2. 1966 · document_releaseUniform Time Act of 1966 enacted
  3. 2007 · mutationU.S. DST schedule extended under Energy Policy Act changes
  4. 2021-03-11 · popularizationHistorical explainers recirculate around spring clock change
  5. 2022-11-07 · amplificationPublic history coverage revisits DST origins and disputes
  6. 2025-04-10 · investigationCongressional hearing on DST versus standard time

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