Daylight saving time abbreviated dst often referred to as daylight savings time in the usa see terminology and known as summer time in some countries is the practice of advancing clocks during summer months so that evening daylight lasts longer while sacrificing normal sunrise times typically regions that use daylight saving time . Daylight saving time aka daylight savings dst or summer time clocks go forward 1 hour in the spring and back in 1 hour the fall to make better use of natural daylight. Daylight saving time history in united states united states first observed daylight saving time in 1918 united states has observed dst for 101 years between 1918 and 2018 dst in at least one location. Daylight saving time in the united states is the practice of setting the clock forward by one hour during the warmer part of the year so that evenings have more daylight and mornings have less most areas of the united states observe daylight saving time dst . Date calculator most of the united states begins daylight saving time at 200 am on the second sunday in march and reverts to standard time on the first sunday in november in the us each time zone switches at a different time in the european union summer time begins and ends at 100 am universal time greenwich mean time it begins the last sunday in march and ends the last sunday
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