Florida has been in the news for adopting year-round daylights savings time. The “Sunshine Protection Act” is what the proposed law is known as. Even if it becomes state law, Congress would still need to act to grant Florida an exemption from federal timekeeping law.
Daylight Savings Time was first suggested by Ben Franklin in 1784. It was widely adopted during World War I. It was repealed in many but not all countries after the war. It was reinstated during World War II and then partially repealed. It did not become widespread again until the 1960s and 1970s.
During two weeks of May in 1965 St. Paul and Minneapolis, MN were on different times. St. Paul switched when most of the country switched times and Minneapolis switched at the time designated by state law. Similar problems existed in other parts of the country due to irregular application of daylight savings existed such as: One year, 23 different pairs of DST start and end dates were used in Iowa alone. For exactly five weeks each year, Boston, New York, and Philadelphia were not on the same time as Washington D.C., Cleveland, or Baltimore–but Chicago was. And, on one Ohio to West Virginia bus route, passengers had to change their watches seven times in 35 miles!
The benefits are greatest at the middle latitudes and less so at the equator and the extreme latitudes. The benefits are also greater at the eastern side of a time zone compared to the western side of the same time zone.
Generally sports, tourism, and retail have supported daylight savings while agriculture and evening entertainment have opposed it.
Daylight savings saves energy although studies on this subject have had mixed findings about the extent of the actual savings. It also saves on oil consumption.
Daylight savings reduces the number of muggings that occur.
The Romans did not have daylight savings but the water clocks that the Romans used had different lengths of hours depending on the seasons, so summer hours were longer than winter hours.