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  2. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    The 12-hour clock can be traced back as far as Mesopotamia and ancient Egypt. [7] Both an Egyptian sundial for daytime use [8] and an Egyptian water clock for night-time use were found in the tomb of Pharaoh Amenhotep I. [9] Dating to c. 1500 BC, these clocks divided their respective times of use into 12 hours each.

  3. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour digital clock in Miaoli HSR station. A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside.. 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 ...

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

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

    In these cases, exact and unambiguous communication of time is critical. If someone mistakes 5:00 AM for 5:00 PM in a hospital for example, when medication or other medical treatment is needed at a certain time, the outcome could be dire. Thus 24-hour time (5:00 PM written as 17:00) is used.

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  6. Date and time representation by country - Wikipedia

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

    Punctuation and spacing styles differ, even within English-speaking countries (6:30 p.m., 6:30 pm, 6:30 PM, 6.30pm, etc.). [ citation needed ] Most people who live in countries that use one of the clocks dominantly are still able to understand both systems without much confusion; the statements "three o'clock" and "15:00", for example, are ...

  7. Hexadecimal time - Wikipedia

    en.wikipedia.org/wiki/Hexadecimal_time

    A hexadecimal clock-face (using the Florence meridian) 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.

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    mail.aol.com

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  9. Time in the United States - Wikipedia

    en.wikipedia.org/wiki/Time_in_the_United_States

    8:06 pm, January 13, 2025 Hawaii–Aleutian ... Clocks are set ahead one hour at 2:00 a.m. on the following start dates and set back one hour at 2:00 a.m. on the ...