Daylight Saving Time, Definition, History, & Facts

Daylight Saving Time, system for uniformly advancing clocks, so as to extend daylight hours during conventional waking time in the summer months. In countries in the Northern Hemisphere, clocks are usually set ahead one hour in late March or in April and are set back one hour in late September or in October.

Permanent time observation in the United States - Wikipedia

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Daylight Savings Time, DST Definition, History & Purpose - Lesson

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Daylight Saving Time Explained

Daylight Saving Time, Definition, History, & Facts

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Daylight saving time - Wikipedia