DST was first implemented in the United States in 1918 for a brief seven months before being repealed. Later, during World War II, President Franklin D. Roosevelt reinstituted the use of DST. The Uniform Time Act of 1966 officially established a yearly time change beginning in the spring and ending in the fall.nnDST was initially established as a way to conserve energy in the evening. However, research on energy use during DST actually suggests the opposite is true. Studies found energy use either shifts from evening to morning or increases in the form of heating and air conditioning costs during extended daylight hours.