https://en.wikipedia.org/wiki/Daylight_saving_time
George Hudson proposed the idea of daylight saving in 1895.[4] The German Empire and Austria-Hungary organized the first nationwide implementation, starting on April 30, 1916. Many countries have used it at various times since then, particularly since the energy crisis of the 1970s.
https://en.wikipedia.org/wiki/Daylight_ ... ted_States
Most areas of the United States observe daylight saving time (DST), the exceptions being Arizona (except for the Navajo, who do observe daylight saving time on tribal lands),[1] Hawaii,[2] and the overseas territories of American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, and the United States Virgin Islands.