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  2. File:Standard Time Zones of the World (August 2013).pdf

    en.wikipedia.org/wiki/File:Standard_Time_Zones...

    File change date and time: 06:34, 27 September 2013: Date and time of digitizing: 06:34, 27 September 2013: Conversion program: Acrobat Distiller 9.3.2 (Windows) Encrypted: no: Page size: 1512 x 936 pts: Version of PDF format: 1.7

  3. 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.

  4. File:Standard Time Zones of the World (October 2015).pdf

    en.wikipedia.org/wiki/File:Standard_Time_Zones...

    Date and time of digitizing: 10:09, 7 October 2015: Software used: PScript5.dll Version 5.2.2: File change date and time: 10:09, 7 October 2015: Conversion program: Acrobat Distiller 11.0 (Windows) Encrypted: no: Page size: 1512 x 1224 pts: Version of PDF format: 1.5

  5. Time zone - Wikipedia

    en.wikipedia.org/wiki/Time_zone

    Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.

  6. International Meridian Conference - Wikipedia

    en.wikipedia.org/wiki/International_Meridian...

    The Naval Observatory had also foiled the onward transmission of the Greenwich time signal from Harvard, where it was received via transatlantic cable and used to time a time ball in Boston. [6] Nevertheless, the United States passed an Act of Congress on 3 August 1882 authorizing the President to call an international conference to fix on a ...

  7. Coordinated Universal Time - Wikipedia

    en.wikipedia.org/wiki/Coordinated_Universal_Time

    This is an accepted version of this page This is the latest accepted revision, reviewed on 10 February 2025. Primary time standard "UTC" redirects here. For the time zone between UTC−1 and UTC+1, see UTC+00:00. For other uses, see UTC (disambiguation). It has been suggested that UTC offset be merged into this article. (Discuss) Proposed since December 2024. Current time zones Coordinated ...

  8. Standard time - Wikipedia

    en.wikipedia.org/wiki/Standard_time

    This time zone was also known as the Loenen time or Gorinchem time, as this was the exact time in both Loenen and Gorinchem. At noon in Amsterdam, it was 11:40 in London and 12:40 in Berlin. The shift to the current Central European Time zone took place on 16 May 1940. The German occupiers ordered the clock to be moved an hour and forty minutes ...

  9. Universal Time - Wikipedia

    en.wikipedia.org/wiki/Universal_Time

    Standard time zones of the world. The number at the bottom of each zone specifies the number of hours to add to UTC to convert it to the local time. As international commerce increased, the need for an international standard of time measurement emerged. Several authors proposed a "universal" or "cosmic" time (see Time zone § Worldwide time zones).