EngKnowledge: A.M and P.M

Good evening, fellas! How was your Saturday? I hope it was awesome :D

Tonight we’ll have an #EngKnowledge about a.m and p.m terms. Stay tuned, fellas!

a.m and p.m terms is used in 12-hour clock which the 24 hours of the day are divided into two periods. The usage of a 12-hour clock goes back to ancient Egyptians and Mesopotamians who recorded and kept time using sundials during the day and water clocks in the night.

The first period of the day is called “ante merīdiem”, meaning “before midday” in Latin. It’s commonly denoted as “a.m”. It is started at 12 a.m and ended in 11.59 a.m

The second period is called “post merīdiem”, meaning “after midday” in Latin. It’s commonly denoted as “p.m” . It is started at 12.00 p.m and ended in 11.59 p.m

To avoid ambiguity, airlines, railroads, and insurance companies use 12:01am for an event beginning the day, 11:59pm for ending it.

Outside of English-speaking countries, the terms a.m. and p.m. are seldom used and often unknown. The 12-hour clock in speech often uses phrases such as in the morning, in the afternoon, in the evening, and at night.

The term a.m and p.m written in many forms, AM/PM (in capitals), am/pm (without period), and a.m/p.m (with periods) #EngKnowledge According to some sources, in formal writing, it is best to lowercase both a.m. and p.m. and keep the periods. However, if you use a different format, the most important rule is to be consistent throughout your piece. #EngKnowledge

It’s a wrap for this session. Thank you for joining me and I hope it will be useful for you.


Compiled and written by @AnienditaR at @EnglishTips4u on December 12, 2015

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3 responses to “EngKnowledge: A.M and P.M

  1. Pingback: #EngKnowledge: History of ampersand | @EnglishTips4U·

  2. Pingback: #IOTW: Idioms Related to Time | @EnglishTips4U·

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