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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. Midnight - Wikipedia

    en.wikipedia.org/wiki/Midnight

    Though there is no global unanimity on the issue, most often midnight is considered the start of a new day and is associated with the hour 00:00. Strictly speaking, it is incorrect to use "a.m." and "p.m." when referring to noon or midnight. The abbreviation a.m. stands for ante meridiem or before noon, and p.m. stands for post meridiem or ...

  4. Noon - Wikipedia

    en.wikipedia.org/wiki/Noon

    Noon (also known as noontime or midday) is 12 o'clock in the daytime. It is written as 12 noon, 12:00 m. (for meridiem, literally 12:00 midday), 12 p.m. (for post meridiem, literally "after midday"), 12 pm, or 12:00 (using a 24-hour clock) or 1200 (military time). Solar noon is the time when the Sun appears to contact the local celestial meridian.

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

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

    And the hour just after midnight is different too so there’s no double-12. From midnight (12:00 AM) until 12:59 AM, swap the 12 for a zero. ... more confusing if time went from 12:00 PM to 12:01 ...

  6. Roman timekeeping - Wikipedia

    en.wikipedia.org/wiki/Roman_timekeeping

    The English term noon is also derived from the ninth hour. This was a period of prayer initially held at three in the afternoon but eventually moved back to midday for unknown reasons. [12] The change of meaning was complete by around 1300. [13] The terms a.m. and p.m. are still used in the 12-hour clock, as opposed to the 24-hour clock.

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

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

    The suffixes "a.m." and "p.m." (often represented as AM and PM) are appended universally in written language. Alternatively, people might specify "noon" or "midnight", after or instead of 12:00. (Business events, which are increasingly scheduled using groupware calendar applications, are less vulnerable to such ambiguity, since the software ...

  8. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    German (Gallic) hours (half-dial): 2×12 hour system starting at midnight and restarted at noon. It is typical with the 12-hour dial with 12 at the top. The modern 24-hour system is a late-19th century adaptation of the German midnight-starting system, and then prevailed in the world with the exception of some Anglophone countries.

  9. Template:AMPM - Wikipedia

    en.wikipedia.org/wiki/Template:AMPM

    12 (noon) is normally 12 PM for the whole afternoon hour between 12:00 and 12:59. 13..23 (afternoon and start of night) is unambiguously 01..11 PM. 24 (midnight at end of day) is normally 12 AM (but the date must be adjusted when using the 12-hour format).