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  2. Date and time notation in the United States - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    In U.S. military use, 24-hour time is traditionally written without a colon (1800 instead of 18:00). For exact hour times, they are referred to as "hundred", so 10:00 would be referred to as "ten hundred hours" and 11:00 as "eleven hundred hours", from the mathematical interpretation of the numeral sequence.

  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. Daylight saving time in the Americas - Wikipedia

    en.wikipedia.org/wiki/Daylight_saving_time_in...

    The last observance of a daylight saving-related time clock adjustment was between Sunday, 20 April 1980 at 02:00 and Thursday, 25 September 1980 at 02:00. On 25 September the clock was shifted from -3:00 to -4:00, where it has remained since.

  5. October 1980 - Wikipedia

    en.wikipedia.org/wiki/October_1980

    The following events happened in October 1980: ... [25] The next day, ... all Western visitors had to convert DM 25 (worth US$14 at the time) to DDM 25 at the 1:1 ...

  6. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    [17] The separator used between date values (year, month, week, and day) is the hyphen, while the colon is used as the separator between time values (hours, minutes, and seconds). For example, the 6th day of the 1st month of the year 2009 may be written as "2009-01-06" in the extended format or as "20090106" in the basic format without ambiguity.

  7. Why do we work 9 to 5? The history of the eight-hour workday

    www.aol.com/why-9-5-history-eight-105902493.html

    US work culture revolves around employees putting in eight hours a day, five days a week — a schedule immortalized by Dolly Parton in her 1980 song “9 to 5.” It’s just the norm, many ...

  8. This TV movie from the 1980s helped change the course ... - AOL

    www.aol.com/news/tv-movie-1980s-helped-change...

    ABC’s 1983 film overcame censors, political interference and spooked advertisers to become one of the most-watched TV events of all time.

  9. Hexadecimal time - Wikipedia

    en.wikipedia.org/wiki/Hexadecimal_time

    Hexadecimal time is the representation of the time of day as a hexadecimal number in the interval [0, 1). The day is divided into 10 16 (16 10 ) hexadecimal hours, each hour into 100 16 (256 10 ) hexadecimal minutes, and each minute into 10 16 (16 10 ) hexadecimal seconds.