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  2. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before midday") and p.m. (from Latin post meridiem, translating to "after midday").

  3. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    Local time is designated as zone J or "Juliett". "1200J" ("twelve hundred Juliett") is noon local time. Greenwich Mean Time (GMT) or Coordinated Universal Time (UTC) is designated time zone Z, and thus called "Zulu time". (When used as a modern time zone, in practice, GMT and UTC coincide. For other purposes there may be a difference of about a ...

  4. 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 ...

  5. 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.

  6. Prime time - Wikipedia

    en.wikipedia.org/wiki/Prime_time

    Prime time, or peak time, is the block of broadcast programming taking place during the middle of the evening for television shows. It is mostly targeted towards adults (and sometimes families). It is used by the major television networks to broadcast their season's nightly programming.

  7. PM - Wikipedia

    en.wikipedia.org/wiki/PM

    PM or pm (also written P.M. or p.m.) is an abbreviation for Latin post meridiem, meaning "after midday" in the 12-hour clock. PM or Pm or pm may also refer to:

  8. Roman timekeeping - Wikipedia

    en.wikipedia.org/wiki/Roman_timekeeping

    The daytime canonical hours of the Catholic Church take their names from the Roman clock: the prime, terce, sext and none occur during the first (prīma) = 6 am, third (tertia) = 9 am, sixth (sexta) = 12 pm, and ninth (nōna) = 3 pm, hours of the day. The English term noon is also derived from the ninth hour.

  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 ...