History of time in the United States - wikipedia History of time in the United States 1913 Map of U.S. time zones between April 2, 2006, and March 11, 2007. The current situation is different only in that six Indiana counties have since been moved from the Central time zone to the Eastern time zone. The history of standard time in the United States began November 18, 1883, when United States and Canadian railroads instituted standard time in time zones. Before then, time of day was a local matter, and most cities and towns used some form of local solar time, maintained by some well - known clock ( for example, on a church steeple or in a jeweler 's window ). The new standard time system was not immediately embraced by all. Use of standard time gradually increased because of its obvious practical advantages for communication and travel. Standard time in time zones was not established in U.S. law until the Standard Time Act of 1918 of March 19, 1918, also known as the Calder Act ( 15 USC 260 ). The act also established daylight saving time, itself a contentious idea. Daylight saving time was repealed in 1919, but standard time in time zones remained in law, with the Interstate Commerce Commission ( ICC ) having the authority over time zone boundaries.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. It was re-established nationally early in World War II, and was continuously observed until the end of the war. After the war its use varied among states and localities. The Uniform Time Act of 1966 provided standardization in the dates of beginning and end of daylight time in the U.S. but allowed for local exemptions from its observance. The act also continued the authority of the ICC over time zone boundaries. In subsequent years, the United States Congress transferred the authority over time zones to the U.S. Department of Transportation ( DOT ), modified ( several times ) the beginning date of daylight time, and renamed the three westernmost time zones. Time zone boundaries have changed greatly since their original introduction and changes still occasionally occur. DOT issues press releases when these changes are made. Generally, time zone boundaries have tended to shift westward. Places on the eastern edge of a time zone can effectively move sunset an hour later ( by the clock ) by shifting to the time zone immediately to their east. If they do so, the boundary of that zone is locally shifted to the west ; the accumulation of such changes results in the long - term westward trend. The process is not inexorable, however, since the late sunrises experienced by such places during the winter may be regarded as too undesirable. Furthermore, under the law, the principal standard for deciding on a time zone change is the `` convenience of commerce ''. Proposed time zone changes have been both approved and rejected based on this criterion, although most such proposals have been accepted. Contents 1 War Time 1918 and 1942 2 Daylight Saving Time 1945 to 1966 3 DST 1966 4 DST 2007 5 Start and end dates of United States Daylight Saving Time 6 See also 7 Notes 8 References 9 External links War time 1918 and 1942 `` War Time '' redirects here. This usage refers to the changes of the US War Time Act, not a general period of war. 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. Daylight saving time 1945 to 1966 From 1945 to 1966 U.S. federal law did not address DST. States and cities were free to observe DST or not, and most places that did observe DST did so from the last Sunday in April to the last Sunday in September. In the mid-1950s many areas in the northeastern United States began extending DST to the last Sunday in October. The lack of standardization led to a patchwork where some areas observed DST while adjacent areas did not, and it was not unheard of to have to reset a clock several times during a short trip ( e.g., bus drivers operating on West Virginia Route 2 between Moundsville, West Virginia, and Steubenville, Ohio had to reset their watches seven times over 35 miles ). In summer 1960 April -- October Daylight Time was nearly universal in Pennsylvania, Maryland, Delaware and states east and north of there. In Minnesota, Iowa, Missouri, Kentucky and Virginia and states north and east of there, some areas had it and some did not. Except for California and Nevada, which had April - Sept Daylight Time, 99 % of the rest of the country used Standard Time year - round. ( The Official Guide says `` State law prohibits the observance of `` Daylight Saving '' time in Kentucky but Anchorage, Louisville and Shelbyville will advance their clocks one hour from Central Standard time for the period April 24 to October 29, inclusive. `` ) In the middle 1960s the airline and other transportation industries lobbied for uniformity of Daylight dates in the United States. DST 1966 The U.S. federal Uniform Time Act became law on April 13, 1966 and it mandated that DST begin nationwide on the last Sunday in April and end on the last Sunday in October, effective in 1967. The act explicitly preempted all previously enacted state laws related to the beginning and ending of DST. Any state that wanted to be exempt from DST could do so by passing a state law, provided that it exempted the entire state, and Alaska, Arizona, Hawaii, Indiana, and Michigan chose to do so. However, Alaska, Indiana, and Michigan subsequently chose to observe DST. The law was amended in 1972 to permit states that straddle a time zone boundary to exempt the entire area of the state lying in one time zone. Indiana chose to exempt the portion of the state lying in the Eastern Time Zone ; however, that exemption was eliminated in 2006 and the entire state of Indiana now observes DST, leaving Arizona ( with the exception of the Navajo Indian Reservation ) and Hawaii as the only two states not to observe DST. On July 8, 1986, President Ronald Reagan signed the Federal Fire Prevention and Control Act of 1986 into law that contained a daylight saving rider authored by Senator Slade Gorton ( R - WA ). The starting date of DST was amended to the first Sunday in April effective in 1987. DST continued to end on the last Sunday in October. While the 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. DST 2007 Starting March 11, 2007, DST was extended another four to five weeks, from the second Sunday of March to the first Sunday of November. The change was introduced by Representatives Fred Upton ( R - MI ) and Edward Markey ( D - MA ) and added to the Energy Policy Act of 2005 ; the House had originally approved a motion that would have extended DST even farther from the first Sunday in March to the last Sunday in November, but Senators Jeff Bingaman ( D - NM ) and Pete Domenici ( R - NM ) agreed to scale back the proposal in conference committee due to complaints from farmers and the airline industry. Proponents claimed that the extension would save `` the equivalent of '' 10,000 barrels ( 1,600 m ) of oil per day, but this figure was based on U.S. Department of Energy information from the 1970s, the accuracy and relevance of which the DoE no longer stands by. Later studies by the U.S. Department of Energy and the California Energy Commission have predicted much smaller energy benefits. There is very little recent research on what the actual positive effects, if any, might be. Since DST moves sunrise one hour later by the clock, late sunrise times become a problem when DST is observed either too far before the vernal equinox or too far after the autumnal equinox. Because of this, the extension was greeted with criticism by those concerned for the safety of children who would have been forced to travel to school before sunrise, especially in the month of March. In addition, the airline industry was especially concerned if DST were to be extended through to the last Sunday in November, as this is very often ( 6 out of every 7 years ) the Sunday after Thanksgiving. This is one of the busiest travel days at American airports, and could have resulted in much havoc among travelers who forgot that the clocks were changing that day. If the original proposal to extend DST through the last Sunday in November had been adopted, the entire United States, with the exception of the states that exempted themselves, would have experienced the latest sunrises of the year during the month of November, which would have approached the extremely late sunrise times when DST went into effect on January 6, 1974 due to the 1973 energy crisis creeping after 9 am in places like New Salem, North Dakota at the northwestern edges of time zones. Start and end dates of United States Daylight Saving Time Key to colors future date 2nd Sunday March 1st Sunday November 1st Sunday April last Sunday October last Sunday April last Sunday October Year Begins ( local ) Ends ( local ) Notes 2020 Sun March 8 02 : 00 Sun November 1 02 : 00 2019 Sun March 10 02 : 00 Sun November 3 02 : 00 2018 Sun March 11 02 : 00 Sun November 4 02 : 00 2017 Sun March 12 02 : 00 Sun November 5 02 : 00 2016 Sun March 13 02 : 00 Sun November 6 02 : 00 2015 Sun March 8 02 : 00 Sun November 1 02 : 00 2014 Sun March 9 02 : 00 Sun November 2 02 : 00 2013 Sun March 10 02 : 00 Sun November 3 02 : 00 2012 Sun March 11 02 : 00 Sun November 4 02 : 00 2011 Sun March 13 02 : 00 Sun November 6 02 : 00 Sun March 14 02 : 00 Sun November 7 02 : 00 2009 Sun March 8 02 : 00 Sun November 1 02 : 00 2008 Sun March 9 02 : 00 Sun November 2 02 : 00 2007 Sun March 11 02 : 00 Sun November 4 02 : 00 Energy Policy Act of 2005 2006 Sun April 2 02 : 00 Sun October 29 02 : 00 All of Indiana now on DST 2005 Sun April 3 02 : 00 Sun October 30 02 : 00 Sun April 4 02 : 00 Sun October 31 02 : 00 2003 Sun April 6 02 : 00 Sun October 26 02 : 00 2002 Sun April 7 02 : 00 Sun October 27 02 : 00 Sun April 1 02 : 00 Sun October 28 02 : 00 2000 Sun April 2 02 : 00 Sun October 29 02 : 00 1999 Sun April 4 02 : 00 Sun October 31 02 : 00 1998 Sun April 5 02 : 00 Sun October 25 02 : 00 Sun April 6 02 : 00 Sun October 26 02 : 00 Sun April 7 02 : 00 Sun October 27 02 : 00 1995 Sun April 2 02 : 00 Sun October 29 02 : 00 Sun April 3 02 : 00 Sun October 30 02 : 00 Sun April 4 02 : 00 Sun October 31 02 : 00 Sun April 5 02 : 00 Sun October 25 02 : 00 1991 Sun April 7 02 : 00 Sun October 27 02 : 00 Sun April 1 02 : 00 Sun October 28 02 : 00 Sun April 2 02 : 00 Sun October 29 02 : 00 Sun April 3 02 : 00 Sun October 30 02 : 00 Sun April 5 02 : 00 Sun October 25 02 : 00 Federal Fire Prevention and Control Act of 1986 1986 Sun April 27 02 : 00 Sun October 26 02 : 00 1985 Sun April 28 02 : 00 Sun October 27 02 : 00 1984 Sun April 29 02 : 00 Sun October 28 02 : 00 Sun April 24 02 : 00 Sun October 30 02 : 00 Alaska time zones changed Sun October 30 02 : 00 1982 Sun April 25 02 : 00 Sun October 31 02 : 00 1981 Sun April 26 02 : 00 Sun October 25 02 : 00 1980 Sun April 27 02 : 00 Sun October 26 02 : 00 1979 Sun April 29 02 : 00 Sun October 28 02 : 00 1978 Sun April 30 02 : 00 Sun October 29 02 : 00 1977 Sun April 24 02 : 00 Sun October 30 02 : 00 1976 Sun April 25 02 : 00 Sun October 31 02 : 00 Sun February 23 02 : 00 Sun October 26 02 : 00 Emergency Daylight Time Act Michigan exempted, began DST Sun April 27 02 : 00 Sun January 6 02 : 00 Sun October 27 02 : 00 Emergency Daylight Time Act Southern Idaho and eastern Oregon ( Mountain time zone ) began DST Sun February 3 02 : 00 1973 Sun April 29 02 : 00 Sun October 28 02 : 00 All of Michigan now on DST 1972 Sun April 30 02 : 00 Sun October 29 02 : 00 1971 Sun April 25 02 : 00 Sun October 31 02 : 00 Indiana ( Eastern time zone ) opts out 1970 Sun April 26 02 : 00 Sun October 25 02 : 00 1969 Sun April 27 02 : 00 Sun October 26 02 : 00 All of Alaska and Indiana now on DST 1968 Sun April 28 02 : 00 Sun October 27 02 : 00 Arizona and Michigan opt out 1967 Sun April 30 02 : 00 Sun October 29 02 : 00 Uniform Time Act of 1966 Alaska, Hawaii, Indiana and territories opt out 1946 -- 66 Local decision, various dates 1945 Sun September 30 02 : 00 War Time ends 1944 War Time all year Arizona War Time not observed Sat January 1 02 : 00 -- Sat April 1 02 : 00 Arizona War Time ends Sat September 30 02 : 00 1943 War Time all year 1942 Mon February 9 02 : 00 War Time begins year round 1920 -- 41 Local decision, various dates 1919 Sun March 30 02 : 00 Sun October 26 02 : 00 War Time ends 1918 Sun March 31 02 : 00 Sun October 27 02 : 00 War Time begins summer only See also Time in the United States Time in Indiana Daylight saving time in the United States - gives a list of future daylight saving dates Notes Jump up ^ United States statutes at large : containing the laws and concurrent resolutions enacted during the second session of the one hundred fifth congress of the United States of America 1998 and proclamations. Government Printing Office. 1999. p. 599. Jump up ^ History of Daylight Time in the U.S., United States Naval Observatory ^ Jump up to : A Time - Change Timeline, National Public Radio, March 8, 2007 Jump up ^ An Act For the repeal of the daylight - saving law, Pub. L. 66 -- 40, 41 Stat. 280, enacted August 20, 1919 Jump up ^ 24 / 7 : A Resource Guide to the Law of Time Standards '' Archived 2006 - 06 - 18 at the Wayback Machine., June 3, 2002 Jump up ^ Daylight Saving Time : Early adoption in law Jump up ^ 15 USC 260a Jump up ^ Energy Concerns Push Clocks Forward this Weekend by Nell Boyce. Morning Edition, National Public Radio, 9 March 2007. Jump up ^ Daylight Saving Time in Arizona References Prerau, David. Seize the Daylight : The Curious and Contentious Story of Daylight Saving Time ( Thunder 's Mouth Press ; ISBN 1 - 56025 - 655 - 9 ) Discusses the establishment of standard time and daylight saving time. External links U.S. Navy time zone page Standard Time Zone Boundaries 49CFR71 U.S. Law 15USC260 - 267 History of Daylight Saving Time at WebExhibits Congressional Research on Daylight Saving Time History of DST in Arizona A Resource Guide to the Law of Time Standards 1918 and 1942 Acts Indiana Time Zone Article Retrieved from `` https://en.wikipedia.org/w/index.php?title=History_of_time_in_the_United_States&oldid=810691610 '' Categories : Economic history of the United States History of science and technology in the United States Time in the United States Hidden categories : Webarchive template wayback links Talk Contents About Wikipedia Türkçe Edit links This page was last edited on 16 November 2017, at 21 : 06. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. 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Question: when did the usa start using daylight savings time
Answer: January 20, 1942