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  2. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    The 12-hour clock was used throughout the British empire. During the 15th and 16th centuries, the 12-hour analog dial and time system gradually became established as standard throughout Northern Europe for general public use. The 24-hour analog dial was reserved for more specialized applications, such as astronomical clocks and chronometers.

  3. 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 ...

  4. Date and time notation in Japan - Wikipedia

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

    Japanese broadcasting and newspapers usually use a modified 12-hour notation in which midnight is 午前0時 (0 am) and noon is 午後0時 (0 pm) and, for example, "quarter past midnight" is 午前0時15分. The AM/PM signs are also used, while the sign may be placed either before or after the time (AM10:00 or 10:00AM). Using the Japanese ...

  5. What Do AM and PM Stand For? - AOL

    www.aol.com/am-pm-stand-153002424.html

    If you’re using military time, or the 24-hour system, you don’t need AM and PM because there are no duplicate numbers. Instead of going back to 1 after 12:59 (PM), you move on to 13:00.

  6. Traditional Chinese timekeeping - Wikipedia

    en.wikipedia.org/wiki/Traditional_Chinese...

    The time between each gēng is 1⁄10 of a day, making a gēng 2.4 hours—or 2 hours 24 minutes—long. The 5 gēngs in the night are numbered from one to five: yì gēng (一 更) (alternately chū gēng (初更) for "initial watch"); èr gēng (二更); sān gēng (三更); sì gēng (四更); and wǔ gēng (五更). The 5 gēngs in daytime ...

  7. Decimal time - Wikipedia

    en.wikipedia.org/wiki/Decimal_time

    The large dial shows the ten hours of the decimal day in Arabic numerals, while the small dial shows the two 12-hour periods of the standard 24-hour day in Roman numerals. Decimal time is the representation of the time of day using units which are decimally related. This term is often used specifically to refer to the French Republican calendar ...

  8. Date and time representation by country - Wikipedia

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

    Whether the 24-hour clock, 12-hour clock, or 6-hour clock is used. Whether the minutes (or fraction of an hour) after the previous hour or until the following hour is used in spoken language. The punctuation used to separate elements in all-numeric dates and times. Which days are considered the weekend.

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

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

    In traditional American usage, dates are written in the month–day–year order (e.g. September 17, 2024) with a comma before and after the year if it is not at the end of a sentence [2] and time in 12-hour notation (11:47 am). International date and time formats typically follow the ISO 8601 format (2024-09-17) for all-numeric dates, [3 ...

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