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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").
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 ”.
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
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?
12 PM Sunset 12 AM Early evening to late night Waxing gibbous 3 PM Late evening 3 AM Early evening [8] and most of night Full moon: 6 PM Midnight 6 AM Sunset to sunrise (all night), a lunar eclipse is then possible Waning gibbous 9 PM Predawn 9 AM Most of night and early morning [6] Last quarter 12 AM Sunrise 12 PM Predawn to post-sunrise
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.).
Official time is always given in 24-hour format. A full stop was originally used to separate the hours and minutes (18.20). Whilst this method is still in use in some areas such as the press, the colon is preferred in most modern usage (18:20).
The 12-hour notation is also commonly used, by adding 午前 ("before noon") or 午後 ("after noon") before the time, e.g. 午前10時 for 10 am. [1] Japanese broadcasting and newspapers usually use a modified 12-hour notation in which midnight is 午前0時 (0 am) and noon is 午後0時 (0 pm) and, for example, "quarter past midnight" is ...