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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").
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 q.o.d., qod every other day / alternate days quaque altera die q.p.m., qPM, qpm
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.
The night from six o'clock in the evening to six o'clock in the morning was divided into four watches or vigils of three hours each, the first, the second, the third, and the fourth vigil. [10] The Night Office is linked to Psalm 119:62: "At midnight I will rise to give thanks unto thee because of thy righteous judgments." [11]
every night QNS q.n.s. quantity not sufficient q.o.d. every other day (from Latin quaque altera die) (deprecated; use "every other day" instead. See the do-not-use list) QOF: Quality and Outcomes Framework (system for payment of GPs in the UK National Health Service) q.o.h. every other hour q.s.
Morning (2 C, 7 P) N. Night (10 C, 26 P) Pages in category "Parts of a day" The following 20 pages are in this category, out of 20 total.
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Where the a.m.–p.m. convention is inconvenient typographically (e.g., in dense tables), different fonts or colors are sometimes used instead. The most common usage in transport timetables for air, rail, bus, etc. is to use lightface for a.m. times and boldface for p.m. times. It is also not uncommon for AM and PM to be shortened to A and P.