Daylight saving time, also daylight savings time or daylight time and summer time, is the practice of advancing clocks during warmer months so that darkness falls later each day according to the clock.
Practice of advancing clocks so that evenings have more daylight and mornings have less
About an hour ahead of the time in the summer months.
A widely used system of adjusting the official local time forward, usually by one hour from its official standard time, for the spring, summer, and early autumn periods.
The practice in some places of adjusting clocks forward in the spring and back in the fall, usually by one hour, so that the adjustment causes the time to coincide with the greatest period of illumination by the sun over the course of the day.