AM and PM

AM and PM are acronyms used to identify in which period of the day we are. AM and PM come from Latin. The meaning of AM and PM is Ante Meridiem (before noon) and Post Meridien (after noon).

AM and PM

The abbreviations AM and PM

The abbreviations AM and PM can both appear in uppercase letters as lowercase, with points or without points. In all these ways, the acronym is correct.

AM and PM hours

As the day has 24 hours and, by convention, is to divide it into two periods of equal duration, AM and PM are the reference that does not confuse, for example, two hours of the morning with two hours of the afternoon.

In certain countries, the counting of the hours is not done as here in Brazil; here, after the noon (12:00), we continue to count and an hour in the afternoon is 13:00 hours. So, until you get to midnight. Our count goes up to 23:59 because when this minute is over, go back to the beginning of the day at 00:00.

In English (and in many of the countries that speak English), only if you know exactly what time it is when the number is accompanied by AM or PM, and after noon (12:00), the count starts again and, at 13:00 hours, says that it is a time PM.

AM and PM in English

AM in English it means before midday (before noon), however, is not usual in English to refer this way to hours before mid-day; they use the phrase before noon; AM also appears with the meaning of after midnight (after midnight). In both cases, reference is made to the period between 00:00 hours to 11:59 (the first half of the day). PM means after midday, which in the language of the usual calls of the afternoon (the period after the middle of the day), which begins at 12:00 and ends at 23:59.

AM is the first half of the day, which starts at 00:00 hours (midnight for us) and goes until 11:59. At noon, 12:00 hours, start of the period PM. Therefore midnight is AM and noon is PM.

12 hours is AM or PM?

Watches pointers and some of the digital watches only have 12 hours on their dials, so to know if 12 hours is AM or PM in the clock, you need to check whether you are the midnight (AM) or half-day (PM).

AM and PM – airlines, railroad, and insurance companies

In the countries in which the hour count goes from zero to twelve, and in that the use of AM and PM is essential, certain sectors are 12 am to 12 pm referring to these times respectively as 12 noon (for the half-day) and 12 midnight (to midnight); to the industries in which the ambiguity of the denomination of 12 hours by the same number, by changing only the AM and PM could be dangerous, as in flight schedules, use 12:01 am to refer to the beginning of the day and 11:59 pm for the end of the day.

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