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  2. Time in Canada - Wikipedia

    en.wikipedia.org/wiki/Time_in_Canada

    On October 31, 2019, the government introduced Bill 40 in the legislature, which would define "Pacific Time" as "7 hours behind Coordinated Universal Time (UTC)". [28] In a press release, the provincial government stated an intention to maintain alignment of clock time with Washington, Oregon, California, and Yukon. [29]

  3. Effects of time zones on North American broadcasting

    en.wikipedia.org/wiki/Effects_of_time_zones_on...

    Local programming such as locally produced newscasts are not typically affected as many stations air their morning newscast at 4:00, 4:30, 5:00 or 5:30 a.m., and their early evening newscasts at 5:00 and/or 6:00 p.m.; however, the late evening newscast is affected due to the differences in time between time zones, meaning that if the late local ...

  4. History of time in the United States - Wikipedia

    en.wikipedia.org/wiki/History_of_time_in_the...

    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.

  5. Standard time - Wikipedia

    en.wikipedia.org/wiki/Standard_time

    A standardised time system was first used by British railways on 1 December 1847, when they switched from local mean time, which varied from place to place, to Greenwich Mean Time (GMT). It was also given the name railway time, reflecting the important role the railway companies played in bringing it about. The vast majority of Great Britain's ...

  6. Time in the United States - Wikipedia

    en.wikipedia.org/wiki/Time_in_the_United_States

    Operators of the new railroad lines needed a new time plan that would offer a uniform train schedule for departures and arrivals. Four standard time zones for the continental United States were introduced at noon on November 18, 1883, in Chicago, IL, when the telegraph lines transmitted time signals to all major cities. [4] [5]

  7. Civil time - Wikipedia

    en.wikipedia.org/wiki/Civil_time

    HM Nautical Almanac Office in the United Kingdom used Greenwich Mean Time (GMT) for both conventions, leading to ambiguity [clarification needed], whereas the Nautical Almanac Office at the United States Naval Observatory used GMT for the pre-1925 convention and Greenwich Civil Time (GCT) for the post-1924 convention until 1952.

  8. GMT - Wikipedia

    en.wikipedia.org/?title=GMT&redirect=no

    Mentioned in a hatnote: This is a redirect from a title that is mentioned in a hatnote at the redirect target. The mention is usually atop the target article.It may, however, be directly under a section header, or in another article's hatnote (whenever the hatnote is under a section, {{R to section}} should also be used).

  9. Greenwich Mean Time - Wikipedia

    en.wikipedia.org/wiki/Greenwich_Mean_Time

    Greenwich Mean Time (GMT) is the local mean time at the Royal Observatory in Greenwich, London, counted from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon ; [ 1 ] as a consequence, it cannot be used to specify a particular time unless a context is given.