Daylight saving time

Daylight saving time, also referred to as daylight saving, daylight savings time, daylight time, or summer time, is the practice of advancing clocks to make better use of the longer daylight available during summer so that darkness falls at a later clock time. The typical implementation of DST is to set clocks forward by one hour in spring or late winter, and to set clocks back by one hour to standard time in the autumn. Wikipedia