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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"). [1] [2] Each period consists of 12 hours numbered: 12 (acting as 0), [3] 1, 2, 3, 4

  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. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour digital clock in Miaoli HSR station. A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside.. 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 ...

  5. 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.

  6. 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.

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

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

    In U.S. military use, 24-hour time is traditionally written without a colon (1800 instead of 18:00). For exact hour times, they are referred to as "hundred", so 10:00 would be referred to as "ten hundred hours" and 11:00 as "eleven hundred hours", from the mathematical interpretation of the numeral sequence.

  8. every 6 hours quaque sexta hora q.8.h., q8h every 8 hours quaque octava hora q.a.m., qAM, qam every morning: quaque ante meridiem q.d., qd every day / daily quaque die q.h.s., qhs every night at bedtime quaque hora somni q.d.s, qds, QDS 4 times a day quater die sumendum q.i.d, qid 4 times a day quater in die q.h., qh every hour, hourly quaque hora

  9. List of medical abbreviations: Q - Wikipedia

    en.wikipedia.org/wiki/List_of_medical...

    each hour (from Latin quaque hora) q.h.s. every bedtime (from Latin quaque hora somni) q.i.d. four times each day (from Latin quater in die) (not deprecated, but consider using "four times a day" instead. See the do-not-use list) QIDS: Quick Inventory of Depressive Symptoms: q.l. as much as you like (from Latin quantum libet) q.m.t. also qm ...