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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").
Punctuation and spacing styles differ, even within English-speaking countries (6:30 p.m., 6:30 pm, 6:30 PM, 6.30pm, etc.). [ citation needed ] Most people who live in countries that use one of the clocks dominantly are still able to understand both systems without much confusion; the statements "three o'clock" and "15:00", for example, are ...
The AM/PM system actually does have a specific abbreviation for noon—just the letter “M,” short for “meridiem,” which would come after “12” and only refer to noon. Haven’t heard of it?
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 ”.
Date and time notation in the United Kingdom records the date using the day–month–year format (31 December 1999, 31/12/99 or 31/12/1999). The time can be written using either the 24-hour clock (23:59) or the 12-hour clock (11:59 p.m.), either with a colon or a full stop (11.59 p.m.).
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.
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.
The 12-hour notations is also used orally but instead of AM/PM, it's necessary to specify the place of the sun: Time span Example Notes Đêm (Night) 00:00 to 00:59