It could be used in conversations and informal communication only. However, the legal documents, schedules, and other interactions that require high precision time identification should follow the hour format to avoid confusion with the denomination of noon and midnight. Considering that hour clock is the most effective system of timekeeping and it is used for high precision coordination, the international organizations managed to provide the most effective solution.
Therefore, the standard ISO implies that all countries should use the specific format to indicate date and time hour clock and it should be used for documentation and formal communication 2. However, the international agreements do not directly regulate how organizations within the countries use timekeeping format for the interactions and communication.
Hence, some domestic organizations could proceed to use AM and PM. The most strange scenario remains to be the moment when one watches on the hour clocks or wristwatches and should convert the time into the hour format. Namely, if it is 3 PM, one needs to add 3 to The sum will be The same goes for adding another corresponding number to The coordination of military actions requires the precise and unambiguous comprehension of time. Since the solar day is the primary measure of time, the military establishments utilize hour clock format and do not separate hours minutes.
For instance, instead of Noon or 12 PM civilian time , military time denotes which should be pronounced as twelve hundred. The same pronunciation is also used to indicate time in radio communication. This format is the most exact way to refer to time and use it for navigation and scheduling. Even though the hour time format might be puzzling and ambiguous for many people, it is still the most popular format for the wristwatches.
Moreover, referring to time in a less complex manner is convenient for informal communication on matters which do not require precise timing. There might be confusion regarding the time of a day as well as it can mislead in the date when midnight is not properly indicated.
Considering that legal and other formal standards require the use of hour convention, the utilization of AM and PM would remain only as the tradition in informal communication. AM stands for ante meridiem, while PM stands for post meridiem. Hence, ante meridiem, i. AM literally mean before noon, while post meridiem, i. PM means after midday.
This time differentiation is not really a new phenomenon. The hour clock was in development since the mid-second millennium BC. Over the past odd years, the clock has been fine tuned and eventually came to be in its current form in 16th century AD. The day actually begins at midnight, i. In the 12 hour clock, this becomes am.
To avoid any confusion when referring to the precise moment of noon or midnight, we recommend using the designations 12 noon and 12 midnight instead. Another source of confusion is the lack of a date designator in the hour system, making it impossible to logically identify a correct moment in time when only a date and am midnight is provided. Imagine being asked to pick up a friend at the airport at am on April Would you go there at midnight between April 12 and April 13?
Or 24 hours later? One way to overcome this problem is to sacrifice accuracy for clarity. Your friend could ask you to be at the airport at am on April 13 or, if the following midnight is meant, at pm on April Alternatively, the hour format could be used. Here, refers to midnight at the beginning of the day while is midnight at the end of the day. A hour clock, sometimes referred to as military time, states the time according to the number of hours that have passed since midnight. Starting at midnight, hours are numbered from 0 to 24, removing the need for designations like am and pm.
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