History of time in the United States

If they do so, the boundary of that zone is locally shifted to the west; the accumulation of such changes results in the long distance term westward trend.

One of the first reported incidents which brought about a change in how time was organized on railways in the United States occurred in New England in August 1853.

In doing so, they would pre-empt the imposition of more costly and cumbersome arrangements by different state legislators and the naval authorities, both of whom favored retention of local times.

For example, in Indianapolis the report in the daily Sentinel for November 17, 1883, protested that people would have to "eat sleep work ... and marry by railroad time".

Year-round DST was reinstated in the United States on February 9, 1942, again as a wartime measure to conserve energy resources.

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).

[13] 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 used DST and some did not.

(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.")

The act explicitly preempted all previously enacted state laws related to the beginning and ending of DST effective in 1966.

The extension was not continued due to public opposition to late sunrise times during the winter months.

[14] 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.

This time the change was introduced by Representatives Fred Upton and Ed Markey and added to the Energy Policy Act of 2005; the United States House of Representatives 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 and Pete Domenici agreed to scale back the proposal in conference committee due to complaints from farmers and the airline industry.

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.

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.

The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments.
Plaque in Chicago marking the creation of the four time zones of the continental US in 1883
Colorized 1913 time zone map of the United States, showing boundaries very different from today
Map of U.S. time zones during 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.
Map of 1884/5 explaining the time zones used on American railway lines.
This cartoon appeared on the cover of Life magazine, January 3, 1884
Time zone map of 1948. The borders between zones are slightly different to those of today.