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  2. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    The American Heritage Dictionary of the English Language states "By convention, 12 AM denotes midnight and 12 PM denotes noon. Because of the potential for confusion, it is advisable to use 12 noon and 12 midnight". [34] E. G. Richards in his book Mapping Time (1999) provided a diagram in which 12 a.m. means noon and 12 p.m. means midnight. [35]

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

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

    Not to mention it would probably be even more confusing if time went from 12:00 PM to 12:01 AM. So noon then becomes 12 PM by default. Though, if you’re deeply linguistically opposed to calling ...

  4. Midnight - Wikipedia

    en.wikipedia.org/wiki/Midnight

    The 30th edition of the U.S. Government Style Manual (2008), in sections 9.54 and 12.9b, recommended the use of "12 a.m." for midnight and "12 p.m." for noon. [3] [4] However, the previous 29th edition of the U.S. Government Printing Office Style Manual (2000), in section 12.9, recommended the opposite. There is no further record documenting ...

  5. 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 ...

  6. Date and time notation in the United Kingdom - Wikipedia

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

    Date and time notation in the United Kingdom records the date using the day–month–year format (31 December 1999, 31/12/99 or 31/12/1999). The time can be written using either the 24-hour clock (23:59) or the 12-hour clock (11:59 p.m.), either with a colon or a full stop (11.59 p.m.).

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

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

    The United States uses the 12-hour clock almost exclusively, not only in spoken language, but also in writing, even on timetables, for airline tickets, and computer software. The suffixes "a.m." and "p.m." (often represented as AM and PM) are appended universally in written language.

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  9. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    This system, as opposed to the 12-hour clock, is the most commonly used time notation in the world today, [A] and is used by the international standard ISO 8601. [1] A number of countries, particularly English speaking, use the 12-hour clock, or a mixture of the 24- and 12-hour time systems.