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What does AM and PM stands for and what is their purpose ?

AM and PM
Image by Monika Neumann from Pixabay

Some countries, as well as America, Canada, and Australia use the 12-hour clock format as well as AM and PM. What do these abbreviations mean? Is it hour AM or PM?

Two 12-Hour Periods

The twelve-hour system divides the twenty-four hours of each day into 2 periods lasting 12 hours every. the primary 12-hour amount is selected as am. It runs from an hour to high noon. The playing period, marked pm, covers the twelve hours from high noon to an hour.

The abbreviations am and pm derives from Latin:

AM = Ante meridiem: Before high noon
PM = Post meridiem: when high noon

Using numbers from one to twelve, followed by ante meridiem or post meridiem, the 12-hour clock system identifies all twenty-four hours of the day. for instance, five am is early within the morning, and five pm is late within the when noon; one being is one hour after hour, whereas eleven pm is one hour before the hour.

Ante meridiem is usually denoted as AM, am, a.m., or A.M.; post meridiem is typically abbreviated PM, pm, p.m., or P.M. Like several different sources, time and date.com uses ante meridiem and post meridiem, however the opposite variants square measure equally correct and widely used.

Midnight and Noon

The main weakness of the 12-hour system could be widespread confusion regarding that abbreviation ought to be used for noon and midnight. IT neither moment will logically be known as before noon (am) or when noon (pm). For instance, the instant of hour happens exactly twelve hours when noon on the previous day and twelve hours before noon on a subsequent day.

am and pm
Image by Alejandro Guerrero from Pixabay

However, most digital clocks and most sources, as well as timeanddate.com, designate hour as twelve am and high noon as twelve pm. though the precise moment of high noon falls in neither class, the hour succeeding it, from 12:00:01 to 12:59:59, is clear when high noon.

To avoid any confusion once concerning the precise moment of high noon or hour, we have a tendency to suggest mistreatment of the designations twelve high noon and twelve-hour instead.

Midnight Confusion

Another supply of confusion is that the lack of a date designator within the 12-hour system, creating it not possible to logically establish an accurate moment in time once solely date and 12:00 am (midnight) are provided.

Imagine being asked to select up a lover at the flying field at 12:00 am on April thirteen. Would you go there in the dead of night between April twelve and April 13? Or twenty-four hours later?

One way to beat this downside is to sacrifice accuracy for clarity. Your friend might raise you to be at the flying field at 12:01 am on April thirteen or, if the subsequent hour is supposed, at 11:59 pm on April thirteen. or else, the 24-hour format might be used. Here, 0:00 refers to the hour at the start of the day whereas 24:00 is the hour at the tip of the day.

AM and PM
Image credits : Reddit

Converting 12-Hour to 24-Hour Format

A 24-hour clock, typically remarked as military time, states the time in keeping with the number of hours that have passed since an hour. beginning in the dead of night, hours square measure numbered from zero to twenty-four, removing the requirement for designations like am and pm. for instance, at 23:00, twenty-three hours have passed since the start of the present day.

To convert am or pm time to the 24-hour format, use these rules:

From hour to 12:59 am, reckon twelve hours.
12:49 am = 0:49 (12:49 – 12)

From one am to high noon, do nothing.
11:49 am = 11:49

From 12:01 pm to 12:59 pm, do nothing.
12:49 pm = 12:49

From 1:00 pm to hour, add twelve hours.
1:49 pm = 13:49 (1:49 + 12)

Here’s the way to convert time on a 24-hour clock to the 12-hour system:

From 0:00 (midnight) to 0:59, add twelve hours and use am.
0:49 = 12:49 am (0:49 + 12)

From 1:00 to 11:59, simply add am when the time.
11:49 = 11:49 am

From 12:00 to 12:59, simply add pm when the time.
12:49 = 12:49 pm

From 13:00 to 0:00, reckon twelve hours and use pm.
13:49 = 1:49 pm (13:49 – 12)

Where is that the 12-Hour Format Used?

Most countries around the world these days use the 24-hour system. However, the 12-hour format is formally employed in a variety of states, as well as us, Canada (except Québec), Australia, New island, and also the Philippines.

Why will the Day Have twenty-four Hours?

The Egyptians square measure thought to be answerable for dividing the day into twenty-four equal elements. One account suggests that this practice evolved as a result of the Egyptians ordinarily used the bottom twelve, tally the three joints in their fingers, not as well as the thumb.

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