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  2. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour digital clock in Miaoli HSR station.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of full minutes that have passed since the last full hour, and ss (00 to 59) is the number of seconds since the last ...

  3. Date and time representation by country - Wikipedia

    en.wikipedia.org/wiki/Date_and_time...

    The 24-hour clock is the most commonly used method worldwide to physically represent the time of day. Some regions utilize 24-hour time notation in casual speech as well, such as regions that speak German, French, or Romanian, though this is less common overall; other countries that utilize the 24-hour clock for displaying time physically may ...

  4. List of time zones by country - Wikipedia

    en.wikipedia.org/wiki/List_of_time_zones_by_country

    This is a list representing time zones by country. Countries are ranked by total number of time zones on their territory. Time zones of a country include that of dependent territories (except Antarctic claims). France, including its overseas territories, has the most time zones with 12 (13 including its claim in Antarctica and all other counties ).

  5. 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.

  6. International Date Line - Wikipedia

    en.wikipedia.org/wiki/International_Date_Line

    A simplified illustration of the relation between date line, date and time of day. Each colour represents a different date. Example depicting situation at 04:00 GMT Tuesday. (Times are approximate, since time zone boundaries generally do not exactly coincide with meridians.

  7. Daytime - Wikipedia

    en.wikipedia.org/wiki/Daytime

    Daytime or day as observed on Earth is the period of the day during which a given location experiences natural illumination from direct sunlight. Daytime occurs when the Sun appears above the local horizon , that is, anywhere on the globe's hemisphere facing the Sun.

  8. Time zone - Wikipedia

    en.wikipedia.org/wiki/Time_zone

    The system has not been directly adopted, but some maps divide the world into 24 time zones and assign letters to them, similarly to Fleming's system. [21] World map of time zones in 1928. By about 1900, almost all inhabited places on Earth had adopted a standard time zone, but only some of them used an hourly offset from GMT.

  9. 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]