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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").
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.
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?
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 ...
Date and time notation in Italy records the date using the day–month–year format (7 febbraio 2025 or 7/2/2025). The time is written using the 24-hour clock (19:11); in spoken language and informal contexts, the 12-hour clock is more commonly adopted, but without using "a.m." or "p.m." suffixes (7:11).
Examples: Long date: 7. juni 1994. Long date with weekday: onsdag(,) den 21. december 1994. Numeric date: 1994-06-07 [48] (The format dd.mm.(yy)yy is the traditional Danish date format. [49] The international format yyyy-mm-dd or yyyymmdd is also accepted, though this format is not commonly used.
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.).
The 24-hour notation is used in writing with an h as a separator (h for heure, meaning hour).Example: 14 h 05 (1405 [14:05] hours or 2:05 pm). Though the correct [citation needed] form includes spaces on both sides of the h, it is common to see them omitted: 14h05.