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Daylight saving time (DST)—also summer time in several countries including in British English and European official terminology (see Terminology)—is the practice of temporarily advancing clocks during the summertime so that afternoons have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn. Modern DST was first proposed in 1895 by George Vernon Hudson. Many countries have used it since then; details vary by location and change occasionally.

The practice has been both praised and criticized. Adding daylight to afternoons benefits retailing, sports, and other activities that exploit sunlight after working hours, but causes problems for farming, evening entertainment and other occupations tied to the sun. Its effect on health and crime is less clear. Although an early goal of DST was to reduce evening usage of incandescent lighting, formerly a primary use of electricity, modern heating and cooling usage patterns differ greatly, and research about how DST currently affects energy use is limited or contradictory.

DST clock shifts present other challenges. They complicate timekeeping, and can disrupt meetings, travel, billing, recordkeeping, medical devices, heavy equipment, and sleep patterns. Software can often adjust computer clocks automatically, but this can be limited and error-prone, particularly when DST protocols are changed.
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Culture, Time, Daylight Savings

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Quick Tip by . November 08, 2011
In all honesty I'm neither here nor there when it comes to Daylight Savings Time, but I do like the fact that when the clock falls back an hour, it's darker when I drive home.
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Related Topics
Time

A component of the measuring system used to sequence events,

Wrist Watch

Watch for telling time.

Winter

A season of the year, extending from December through March

Spring

A season of the year

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