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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").
Many of the English words and expressions we use daily can trace their origins back to Latin, and this is true for some of the English language’s more perplexing abbreviations and acronym ...
In the 24-hour time notation, the day begins at midnight, 00:00 or 0:00, and the last minute of the day begins at 23:59. Where convenient, the notation 24:00 may also be used to refer to midnight at the end of a given date [3] — that is, 24:00 of one day is the same time as 00:00 of the following day.
L'una di pomeriggio is 1 p.m. (1 in the afternoon), le due (di pomeriggio) is 2 p.m., le tre (di pomeriggio) is 3 p.m. etc. Hours after sunset or dusk (but in some cases even just after noon) are given as le sette di sera ("7 in the evening"), le otto di sera (8 in the evening) and so on until 11 p.m. which is le undici di sera.
The Government of Canada recommends using the 24-hour clock to avoid ambiguity, and many industries require it. Fifteen minutes after eight o'clock at night can be written: [3] 20:15; 20:15:00; 8:15 p.m.
Dutch TV listings magazines invariably use 24-hour notation. In written language, time is expressed in the 24-hour notation, with or without leading zero, using a full stop or colon as a separator, sometimes followed by the word uur (hour) or its abbreviation u. – for example, 22.51 uur, 9.12 u., or 09:12.
When the time is expressed in the HH:MM:SS notation, the Roman ante/post-meridiem indicators (AM and PM) are also used frequently. In addition, they sometimes follow the convention of writing the Korean-style indicator before the time; it is not uncommon to encounter times expressed in such a way, e.g., “ AM 9:18 ” instead of “ 9:18 AM ”.
Hour is a development of the Anglo-Norman houre and Middle English ure, first attested in the 13th century. [2] [b]It displaced tide tīd, 'time' [4] and stound stund, span of time. [5]