Everything about Mountain War Time totally explained
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 wasn't 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 wasn't established in
U.S. law until the
Act of March 19, 1918, sometimes called the
Standard Time Act. 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Daylight saving time was repealed in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 isn't 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.
History of DST in the US
Daylight saving time was established by the Act of
March 19 1918, sometimes called the Standard Time Act. The Act was intended to save electricity for seven months of the year, during
World War I.DST was repealed in 1919, though, 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.
From 1945 to 1966, U.S. federal law didn't address DST. States and localities were free to observe DST or not, and the predominant pattern was that the states and localities that did observe DST did so from the last Sunday in April to the last Sunday in September. In the mid-1950s, many states and localities in the northeastern United States began extending DST to the last Sunday in October. The absence of federal standardization resulted in a patchwork where some areas observed DST while adjacent areas did not, and it wasn't unheard of to have to reset a clock several times during a relatively short trip (for example, 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 the middle 1960s the airline and other transportation industries lobbied for uniformity of Daylight dates in the United States. There was no standardization with regards to the start and ending dates. United Airlines, for example, had to publish 27 different timetable editions each year.
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. 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 wasn't continued due to public opposition to late sunrise times during the winter months. In 1976, the United States reverted back to the schedule set in the Uniform Time Act.
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 further 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 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. More recent studies by the Department of Energy and 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 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.
Start and end dates of United States Daylight Time
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