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Daylight Saving Time

Daylight Saving Time (DST) is the practice of advancing civil clocks, usually by one hour, during warmer months to shift daylight from morning to evening. Adoption, dates, and offsets vary widely by country and have changed repeatedly through history.

Daylight Saving Time (DST), known in some regions as summer time, is the convention of advancing civil clocks by a fixed offset (almost always one hour, but in places such as Lord Howe Island only 30 minutes) during part of the year so that evenings have more daylight at the cost of darker mornings. The idea was popularized in the early 20th century and spread during the World Wars as an energy-saving measure. Modern adoption is patchy: most of Europe and North America observe DST on harmonized dates, while most of Asia, Africa, and the equatorial belt do not. Individual jurisdictions change rules frequently, which is one reason the Why Timezone Rules Are So Complex (tzdata) must track Rule lines covering decades of transitions. Effects on energy savings, public health, and traffic safety remain debated in the academic literature, and several legislatures have repeatedly proposed making either standard time or DST permanent.

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June 05, 2026

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