What is the Full Form of AM and PM, Check the full form of AM and PM here

Safalta expert Published by: Saumya Sahoo Updated Wed, 23 Nov 2022 11:31 PM IST

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Know the full form of AM and PM here with Safalta. The first 12 hours from midnight to 12:00 are displayed as AM, and the next 12 hours from 12:00 to 12:00 are displayed as PM. 

Full Form of AM and PM: A 12-hour time indication is only used in English-speaking countries. The written time has only 12 hours, while we have 24 hours in one day. To determine if a written time is an hour in the morning or in the evening AM and PM are used. In most European countries there is a 24-hour written time used where 0 to 12 hours is in the morning and 13-24 is in the afternoon/at night. AM stands in short for Ante Meridiem, de Latin name for “Before Midday” or “Before Noon”. An example: 10.00 a.m. is 10 o'clock in the morning. With a 24-hour time, this is 10:00.

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Whereas, PM stands short for Post Meridiem, de Latin name for “After Midday” or “After Noon”. An example: 10.00 p.m. is 10 o'clock in the evening. With a 24-hour time, this is 22:00.  
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Convert 12-hour format to 24-hour formate

Hours are numbered from 0 to 24, with no am or pm designation. Example: At 11:00 PM, 23 hours have passed since the beginning of the current day.
To convert AM or PM times to 24-hour format, use the following rules:
  • 12 hours from midnight to 00:59 are subtracted, 0:49 AM = 0:49 (12:49 – 12). Do nothing from 1 am to 12 pm. 11:49 AM = 11:49 AM. Do nothing from 12:01 pm to 12:59 pm. 12:49 PM = 12:49 PM.
  • Add 12 hours from 1:00 PM to midnight. 1:49 pm = 1:49 pm (1:49 + 12)
  •  To convert 24-hour time to 12-hour time: From 0:00 (midnight) to 0:59 add 12 hours and use AM 0:49 = 00:49 (0:49 + 12) From 1:00 to 11:59 just add am after the time. 11:49 = 11:49 am From 12:00 to 12:59 just add pm after the hour. 12:49 PM = 12:49 PM From 13:00 to 00:00, use pm minus 12 hours. 1:49 PM = 1:49 PM (1:49 PM - 12:00 PM).
The 12-hour clock is the primary written and phonetic time system in some countries, especially those that were part of the former British Empire. The United Kingdom, the Republic of Ireland, the United States, Canada (excluding Quebec), Australia, New Zealand, South Africa, India, Pakistan,  Bangladesh, etc., as well as the former United States, Mexico, the Philippines, are subject to this Convention. However, in most countries,  the standard system used, especially in writing, is the 24-hour clock. Some countries in Europe and Latin America use a combination of both, preferring to use the 12-hour clock in colloquial language, but the 24-hour clock in written and formal contexts.

1st Mechanical Clock

The first mechanical clocks have been invented in Europe withinside the early 14th century and have been the same old timekeeping tool till the discovery of the pendulum clock in 1656. Over time, many components have come together to create the modern watch we have today. Let's look at the evolution of these building blocks and the cultures that have contributed to their evolution.

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The first mention of a candle clock comes from a Chinese poem from 520 AD. According to this poem, measuring candles, whose burning speed was measured, were the means of determining the hour of the night.  

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What is the Full form of AM?

AM stands for abbreviations for Ante Meridiem, meaning before noon or noon. 

What is the Full form of PM?

PM stands for abbreviations Post Meridiem, meaning afternoon or noon

When was the first mechanical clock invented?

The world's first mechanical clock is thought to be a tower clock built during the Renaissance from northern Italy to southern Germany from around 1270 to around 1300. These clocks had no dials or hands, but they indicated the time by ringing bells.

How 12-hour format is converted into 24-hour format?

Hours are numbered from 0 to 24, with no am or pm designation. Example: At 11:00 PM, 23 hours have passed since the beginning of the current day.
To convert AM or PM times to 24-hour format, use the following rules:
  • 12 hours from midnight to 00:59 are subtracted, 0:49 AM = 0:49 (12:49 – 12). Do nothing from 1 am to 12 pm. 11:49 AM = 11:49 AM. Do nothing from 12:01 pm to 12:59 pm. 12:49 PM = 12:49 PM.
  • Add 12 hours from 1:00 PM to midnight. 1:49 pm = 1:49 pm (1:49 + 12)
  •  To convert 24-hour time to 12-hour time: From 0:00 (midnight) to 0:59 add 12 hours and use AM 0:49 = 00:49 (0:49 + 12) From 1:00 to 11:59 just add am after the time. 11:49 = 11:49 am From 12:00 to 12:59 just add pm after the hour. 12:49 PM = 12:49 PM From 13:00 to 00:00, use pm minus 12 hours. 1:49 PM = 1:49 PM (1:49 PM - 12:00 PM).
The 12-hour clock is the primary written and phonetic time system in some countries, especially those that were part of the former British Empire. The United Kingdom, the Republic of Ireland, the United States, Canada (excluding Quebec), Australia, New Zealand, South Africa, India, Pakistan,  Bangladesh, etc., as well as the former United States, Mexico, and the Philippines, are subject to this Convention. However, in most countries,  the standard system used, especially in writing, is the 24-hour clock. Some countries in Europe and Latin America use a combination of both, preferring to use the 12-hour clock in colloquial language, but the 24-hour clock in written and formal contexts.

What is AM and PM?

AM stands for abbreviations for Ante Meridiem and PM stands for abbreviations Post Meridiem, meaning before noon or noon and afternoon or noon respectively. AM and PM are Latin words used to represent time. The first 12 hours from midnight to 12:00 are displayed as AM, and the next 12 hours from 12:00 to 12:00 are displayed as PM. 

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