Daylight saving time (DST) is done to make better use of the longer daylight hours during the summer. By setting clocks forward one hour in spring, people can have more daylight in the evening rather than early in the morning when most are asleep. This allows more daylight after the typical workday, making activities safer and potentially reducing energy use by decreasing the need for artificial lighting in the evening. The practice also originated historically as a way to conserve fuel during wartime by aligning waking hours more closely with daylight hours. DST was first implemented over 100 years ago during World War I and has since been used intermittently to save energy and promote safety and economic activity.
