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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

    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.

  4. AM broadcasting - Wikipedia

    en.wikipedia.org/wiki/AM_broadcasting

    AM broadcasting is radio broadcasting using amplitude modulation (AM) transmissions. It was the first method developed for making audio radio transmissions, and is still used worldwide, primarily for medium wave (also known as "AM band") transmissions, but also on the longwave and shortwave radio bands.

  5. List of time zone abbreviations - Wikipedia

    en.wikipedia.org/.../List_of_time_zone_abbreviations

    Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...

  6. Anno Mundi - Wikipedia

    en.wikipedia.org/wiki/Anno_Mundi

    'to the creation of the world'), abbreviated as AM or A.M., or Year After Creation, [1] is a calendar era based on the biblical accounts of the creation of the world and subsequent history. Two such calendar eras of notable use are:

  7. Abbrev. [1]Meaning [1] Latin (or Neo-Latin) origin [1]; a.c. before meals: a.d., ad, AD right ear auris dextra a.m., am, AM morning: ante meridiem: nocte every night ...

  8. 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. February 23, 2025) 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 (4:14 am). International date and time formats typically follow the ISO 8601 format (2025-02-23) for all-numeric dates, [3] write ...

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

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

    The time-of-day abbreviations (which are generally lowercase only) are handled in various conflicting styles, including "a.m." and "p.m." with a space between the time and the abbreviation ("1.45 p.m."); [8] "am" and "pm" with a space ("1.45 pm" – recognised as an alternative usage by Oxford); [8] and the same without a space ("1.45pm ...