Title: Daylight saving time in the United States
Content:  During World War I, in an effort to conserve fuel, Germany began observing DST on May 1, 1916. The rest of Europe soon followed. The plan was not adopted in the United States until the Standard Time Act of March 19, 1918, which confirmed the existing standard time zone system and set summer DST to begin on March 31, 1918 (reverting October 27). The idea was unpopular, especially with farmers because DST meant they had less time in the morning to get their milk and harvested crops to market. Congress abolished DST after the war, overriding President Woodrow Wilson's veto. DST became a local option. New York City continued to observe a metropolitan DST, while rural 
Title: Standard time in the United States
Content:  states retain the capability to exempt themselves from DST, they are forbidden by the 1966 federal law (15 USC 260a(b)) from increasing a state's time spent on DST, unless the United States Congress does this for the entire nation. In response to the 1973 energy crisis, DST in the United States began earlier in both 1974 and 1975, commencing on the first Sunday in January (January 6) in the former year and the last Sunday in February (February 23) in the latter. The extension of daylight saving time was not continued due to public opposition to late sunrise times during the winter months. In 1976, the United States reverted to the schedule set in the Uniform Time Act.
Title: Daylight saving time in the United States
Content:  outside the city did not. Because of NYC's position as a financial capital, other places followed. A nationwide DST would not be established again until World War II. On February 9, 1942, President Franklin Roosevelt instituted year-round DST, called "War Time". It lasted until the last Sunday (the 30th) in September 1945. After 1945 many states and cities east of the Mississippi River (and mostly north of the Ohio and Potomac rivers) adopted summer DST. From 1945 to 1966 there was no federal law on daylight saving time, so localities could choose when it began and ended or drop it entirely. What emerged was a complicated patchwork of daylight saving policies that varied in length and 
Title: Daylight saving time in the United States
Content:  used daylight saving time in 1966 to start it on the last Sunday in April and end it on the last Sunday in October. In 1967, Arizona and Michigan became the first states to exempt themselves from DST (Michigan would begin observing DST in 1972). In 1972, the act was amended (P.L. 92-267), allowing those states split between time zones to exempt either the entire state or that part of the state lying within a different time zone. The newly created Department of Transportation (DOT) was given power to enforce the law. , the following states and territories are not observing DST: Arizona, Hawaii, American Samoa, Guam, The Northern Mariana Islands, Puerto Rico, and the Virgin Islands.
Title: Daylight saving time
Content:  30, 1916, as a way to conserve coal during wartime. Britain, most of its allies, and many European neutrals soon followed. Russia and a few other countries waited until the next year, and the United States adopted daylight saving in 1918. Most jurisdictions abandoned DST in the years after the war ended in 1918, with exceptions including Canada, the United Kingdom, France, Ireland, and the United States. It became common during World War II (some countries adopted double summer time), and was widely adopted in America and Europe from the 1970s as a result of the 1970s energy crisis. Since then, the world has seen many enactments, adjustments, and repeals.
Title: Daylight saving time in the United States
Content:  Daylight saving time in the United States is the practice of setting the clock forward by one hour when there is longer daylight during the day, so that evenings have more daylight and mornings have less. 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), Hawaii, and the overseas territories of American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, and the United States Virgin Islands. The Uniform Time Act of 1966 established the system of uniform daylight saving time throughout the US. In the U.S., daylight saving time 
Title: Daylight saving time in the United States
Content:  By the Energy Policy Act of 2005, daylight saving time (DST) was extended in the United States beginning in 2007. As from that year, DST begins on the second Sunday of March and ends on the first Sunday of November. In years when April 1 falls on Monday through Wednesday, these changes result in a DST period that is five weeks longer; in all other years the DST period is instead four weeks longer. In 2008, daylight saving time ended at 2:00 a.m. DST (0200) (1:00 a.m. ST) on Sunday, November 2, and in 2009 it began at 2:00 a.m. (3:00 a.m. DST) on Sunday, March 8. Under Section 110 of the act, the U.S. Department of Energy was required to study 
Title: Standard time in the United States
Content:  Daylight saving time was established by the Standard Time Act of 1918. The Act was intended to save electricity for seven months of the year, during World War I. DST was repealed in 1919 over a Presidential veto, but standard time in time zones remained in law, with the Interstate Commerce Commission (ICC) having the authority over time zone boundaries. Daylight time became a local matter. During World War II, Congress enacted the War Time Act (56 Stat. 9) on January 20, 1942. Year-round DST was reinstated in the United States on February 9, 1942, again as a wartime measure to conserve energy resources. This remained in effect until after the end of the war. The Amendment to the War Time Act (59 Stat. 537), enacted September 25, 1945, ended DST as of September 30, 1945. During this period, the official designation War Time was used for year-round DST. For example, Eastern War Time (EWT) would be the equivalent of Eastern Daylight Time during this period.
Title: Daylight saving time
Content:  together with its allies led the way in introducing DST (Sommerzeit) during World War I on April 30, 1916, aiming to alleviate hardships due to wartime coal shortages and air-raid blackouts. The political equation changed in other countries; the United Kingdom used DST first on May 21, 1916. US retailing and manufacturing interests—led by Pittsburgh industrialist Robert Garland—soon began lobbying for DST, but railroads opposed the idea. The USA's 1917 entry into the war overcame objections, and DST started in 1918. The end of World War I brought change in DST use. Farmers continued to dislike DST, and many countries repealed 
Title: Daylight saving time
Content:  With DST, the sun rises and sets one hour later on the clock, but does not add any additional daylight. Thus the already later sunrise times in winter under standard time move another hour later with DST. Depending on latitude, longitude and calendar date, this forces workers and schoolchildren to begin the winter day in darkness. In 1974, after the enactment of the Emergency Daylight Saving Time Act in the United States, there were complaints of children going to school in the dark and working people commuting and starting their work day in pitch darkness during the winter months. The complaints led to the repeal of the Act in October 1974 when standard time was restored until February 23, 1975. In 1976, the United States returned to the schedule set under the Uniform Time Act of 1966. In 1971, year-round daylight time in the United Kingdom was abandoned after a three-year experiment because of complaints about winter sunrise times. The same complaints also led to Russia abandoning DST and instituting standard time year round in 2014.

Question: when did day light savings start in the us?
Answer: March 31, 1918.
1918.
March 19, 1918.
March 11.