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

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.

Pm Full Form is Post Meridiem. Today's world is depends on the two primary timekeeping systems that is 24-hours clock method and 12 hour timekeeping system. 24 hour time-keeping system is used in military time word and 12 hour timekeeping is very popular in the united states, Australia, Malaysia, New Zealand, Colombia, the Philippines, several regions of Canada and other countries. 

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.

Candle Clock

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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