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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").
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 every afternoon or evening
Initially, the day was divided into two parts: the ante meridiem (before noon) and the post meridiem (after noon). With the introduction of the Greek sundial to Rome from the Samnites circa 293 BC, the period of the natural day from sunrise to sunset was divided into twelve hours. [1] [2] [3]
post festum: after the feast: Too late, or after the fact post hoc ergo propter hoc: after this, therefore because of this: A logical fallacy where one assumes that one thing happening after another thing means that the first thing caused the second. post meridiem (p.m.) after midday: The period from noon to midnight (cf. ante meridiem) post ...
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:
post meridiem (in the afternoon) PMB: post-menopausal bleeding (bleeding after menopause) PMD: primary medical doctor PMDD: premenstrual dysphoric disorder: PMH: past medical history (see also medical history) perimesencephalic subarachnoid hemorrhage progressive macular hypomelanosis: PMI: point of maximal impulse or apical beat point of ...
This is also the origin of the terms ante meridiem (a.m.) and post meridiem (p.m.), as noted below. The Sun is directly overhead at solar noon at the Equator on the equinoxes, at the Tropic of Cancer (latitude 23°26′09.7″ N) on the June solstice and at the Tropic of Capricorn (23°26′09.7″ S) on the December solstice.
Government documents and transactions use "DD/MM/YYYY" format when writing in English, Urdu or in Pakistan's regional languages; examples of this can be found on the Pakistani passport application form, the National Identity Card or the Pakistan Origin Card. [1]