Daylight Savings Time officially turns 100 this year. The day was enacted on March 19, 1918 by the federal government as a way to conserve coal during World War I. While the government stopped the practice later that year, local governments kept the fun going for years before it was nationally recognized again in 1966.
Source: LifeHacker – PSA: Daylight Savings Time Starts Sunday, Remember to ‘Spring Forward’