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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").
[1] Meaning [1] Latin (or Neo-Latin) origin [1] a.c. before meals: ante cibum a.d., ad, AD right ear auris dextra a.m., am, AM morning: ante meridiem: nocte every night Omne Nocte a.s., as, AS left ear auris sinistra a.u., au, AU both ears together or each ear aures unitas or auris uterque b.d.s, bds, BDS 2 times a day bis die sumendum b.i.d ...
Instead of going back to 1 after 12:59 (PM), you move on to 13:00. And the hour just after midnight is different too so there’s no double-12. From midnight (12:00 AM) until 12:59 AM, swap the 12 ...
q.AM: every day before noon (from Latin quaque die ante meridiem) q.d. every day (from Latin quaque die) q.d.s. four times each day (from Latin quater die sumendus) q.h. 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)
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.
Returns AM or PM for the hour (between 0 and 24) in parameter: 00 (midnight at start of day) is normally 12 AM for the whole morning hour between 00:00 and 00:59. 01..11 (end of night and morning) is unambiguously 01..11 AM.
In late afternoon, sunlight is particularly bright and glaring, because the sun is at a low angle in the sky. [8] The standard working time in most industrialized countries goes from the morning to the late afternoon or early evening — archetypally, 9:00 am to 5:00 pm — so the latter part of this time takes place in the afternoon. [9]
Siesta time is usually in the early afternoon, between 1 p.m. and 3 p.m. "This timing aligns with our natural circadian rhythms when the days are longer, which often dip after lunch, making it the ...