Daylight Saving Time
Daylight Saving Time
System for uniformly advancing clocks, especially in summer, so as to extend daylight hours during conventional waking time. 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. In the U.S., Daylight Saving Time begins on the second Sunday in March and ends on the first Sunday in November. In most of the countries of western Europe, it starts on the last Sunday in March and ends on the last Sunday in October.
This entry comes from Encyclopædia Britannica Concise.
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