Military Time
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The military time is a convention of time keeping in which the day runs from midnight to midnight and is divided into 24 hours, numbered from 0 to 23.

Military Time

The 24-hour clock is a convention of time keeping in which the day runs from midnight to midnight and is divided into 24 hours, numbered from 0 to 23. This system is the most commonly used time notation in the world today. The 12-hour clock is dominant instead in a handful of countries, particularly the United States and Canada, where is also referred to as "military time". In Australia is known as "army time". In some other parts of the world, it is called "railway time". It is also the international standard notation of time.

Military time (Click to enlarge)
Military time

In the 24-hour time notation, the day begins at midnight, 00:00, and the last minute of the day is that beginning at 23:59. Where convenient, the notation 24:00 may be used in addition to refer to midnight at the end of a given date, that is, 24:00 of the current day is the same point in time as 00:00 of the following day. Wikipedia

In different professions and types of organizations the writing and telling of the military time vary. The military, emergency services and hospitals usually write the 24-hour notation as hours and minutes without a colon and often add the word "hours" afterward. For example, 16:00 would be pronounced "sixteen hundred" or "sixteen hundred hours". In science and engineering, colons are usually inserted between the hours, minutes, and seconds.

The most relevant links we could find, placed here free

Wikipedia - Additional information about the 24-hour notation (military time).

Military Connection - More about the 24-hour notation.

About - Article with additional information about military time.

Some countries that use the 24-hour notation as default are Austria, Germany, Switzerland, Canadian region of Quebec, France, Ireland, Norway, Serbia, Sweden, Turkey and Argentina. Some other countries like India, China and UK have no problem using both 12-hour and 24-hour notation.

Military time clock (Click to enlarge)
Military time clock

12-hour / 24-hour Conversion:

Both notations look similar from 1:00 a.m. to 12:59 p.m. (01:00 to 12:59), except that the 24-hour notation has no a.m./p.m. suffix. To convert a 12-hour time to the 24-hour notation, from 1:00 p.m. to 11:59 p.m. (13:00 to 23:59), one has to add 12 hours, and from 12 midnight to 12:59 a.m. (00:00 to 00:59) one has to subtract 12 hours.

Conversion Table

12-hour -- 24-hour
1:00 AM -- 0100 hrs
2:00 AM -- 0200 hrs
3:00 AM -- 0300 hrs
4:00 AM -- 0400 hrs
5:00 AM -- 0500 hrs
6:00 AM -- 0600 hrs
7:00 AM -- 0700 hrs
8:00 AM -- 0800 hrs
9:00 AM -- 0900 hrs
10:00 AM -- 1000 hrs
11:00 AM -- 1100 hrs
12:00 PM -- 1200 hrs
1:00 PM -- 1300 hrs
2:00 PM -- 1400 hrs
3:00 PM -- 1500 hrs
4:00 PM -- 1600 hrs
5:00 PM -- 1700 hrs
6:00 PM -- 1800 hrs
7:00 PM -- 1900 hrs
8:00 PM -- 2000 hrs
9:00 PM -- 2100 hrs
10:00 PM -- 2200 hrs
11:00 PM -- 2300 hrs

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