Daylight Savings Time is not a new concept, in fact, the idea of ​​daylighting day was first mooted in the eighteenth century by the scientist and diplomat Benjamin Franklin. This American illustrious proposed clocks forward an hour during the summer, in order to better take advantage of natural lighting and so consume fewer candles for lighting at night. At the time the proposal was not implemented, but later, during World War I (1914 - 1918), countries in conflict resorted first to daylight savings time (they called time of war) in order to save energy, because they were then extremely scarce.

Clocks ahead one hour during the months of increased insolation proved to be as efficient as some countries decided to permanently preserve it.

After World War II, more and more countries have joined the summer time, and the rules for their application have been developed to be as clear and universal as possible.

In 1973 the member countries of OPEC imposed an oil embargo important economic consequences, the industrialized nations realized the urgency of promoting measures care energy, at the same time allow reduce the heavy dependence currently it has the fossil fuels such as oil and gas.

Currently, 75 countries use daylight savings time, both in the Northern Hemisphere and in the tropics and the Southern Hemisphere. Among tropical nations that have joined this measure are Australia, Brazil, Cuba, Haiti and Paraguay.