Change of summer time or daylight saving time and coordination of Economic Working Hours () in most countries called Summer Time [. refers to the change of hours in time zones that makes the day longer in the evening and shorter in the morning. This change is usually done in the spring of each year and will return to normal in the fall. In order to optimize energy consumption in spring and summer many countries pull their country's official clock a little (usually an hour) forward so that more hours of the day coincide with working hours and fewer hours of the day.there is a need for energy consumption for the same lighting.the initial idea of this change in modern times was proposed by George Hudson in 1895 and first implemented during World War I. Many countries have used this method at different times. After the energy crisis in the 1970s Summer Time became widely used and is still used today in Northern America and Europe.