Knowra Daylight saving time Daylight saving time Daylight saving time is a seasonal civil-time practice that advances clocks, usually by one hour, during part of the year. It shifts daylight from morning toward evening without changing the amount of daylight.
Standard time : The time assigned to a region under its ordinary time-zone rules, outside seasonal clock changes. It is the baseline clock schedule that daylight saving time temporarily replaces.
Benjamin Franklin : An American writer, scientist, and diplomat who proposed waking earlier to make better use of daylight in an 1784 essay. His satirical essay is often cited as an early precursor, though it did not propose modern clock changes.
Energy conservation : The reduction of energy consumption through efficiency, changed behavior, or reduced demand. Reducing evening lighting demand was an original rationale, though measured savings vary.
Permanent standard time : A policy of keeping clocks on standard time throughout the year without seasonal advances. It avoids twice-yearly clock changes and keeps civil time closer to winter solar time.
Jet lag : A temporary mismatch between a person's internal circadian timing and local time after rapid travel across time zones. The spring clock change can produce a smaller, temporary timing disruption without long-distance travel.
Time zone : A geographic region that shares a standard offset from Coordinated Universal Time. Seasonal clock changes modify the local UTC offset while leaving the region's time-zone boundaries in place.
George Hudson : A New Zealand entomologist who proposed seasonal clock changes in 1895 to gain more evening daylight. His proposal anticipated the modern practice decades before it was adopted.
Electric lighting : The production of visible light using electrically powered devices. Longer evening daylight was expected to reduce the need for artificial lighting.
Permanent daylight saving time : A policy of keeping clocks on the seasonally advanced schedule throughout the year. It preserves later evening clock times but makes winter sunrises later.
Traffic collision : An incident in which a vehicle collides with another vehicle, person, animal, or object. Research examines whether sleep loss and changing daylight affect collision risks around clock transitions.
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