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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").
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 ...
The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated by the hours (and minutes) passed since midnight, from 00(:00) to 23(:59), with 24(:00) as an option to indicate the end of the day.
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).
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 Canada combines conventions from the United Kingdom, conventions from the United States, and conventions from France, often creating confusion. [1]
In Mexico, the standard business hours are from 7 am to 2 pm and 4 pm to 6 pm. (At least in Mexico City most offices open between 8 and 10 am and close around 6 or 7 pm. Some offices close early on Friday. Many offices have their employees work Saturdays until lunch time (usually 2 pm). Other countries have different business hour patterns.