 The 12-hour clock is a way of dividing the 24 hours of the day into two sections. The two halves are called ante meridiem (a.m.) and post meridiem (p.m.). Both names are from Latin, and numbered from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12. Time from midnight to noon is a.m. and from noon to midnight p.m. The table at right shows how it relates to the 24-hour clock.
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The 24-hour clock is a way of telling the time in which the day runs from midnight to midnight and is divided into 24 hours, numbered from 0 to 24. It does not use a.m. or p.m. This system is also referred to (only in the US and the English speaking parts of Canada) as military time[1] or (only in the United Kingdom and now very rarely) as continental time. In some parts of the world, it is called railway time. Also, the international standard notation of time (ISO 8601) is based on this format. A time in the 24-hour clock is written in the form hours:minutes (for example, 01:23), or hours:minutes:seconds (01:23:45). Numbers under 10 have a zero in front (called a leading zero); e.g. 09:07. Under the 24-hour clock system, the day begins at midnight, 00:00, and the last minute of the day begins at 23:59 and ends at 24:00, which is identical to 00:00 of the following day. 12:00 can only be mid-day. Midnight is called 24:00 and is used to mean the end of the day and 00:00 is used to mean the beginning of the day. For example, you would say "Tuesday at 24:00" and "Wednesday at 00:00" to mean exactly the same time. However, the US military prefers not to say 24:00 - they do not like to have two names for the same thing, so they always say "23:59", which is one minute before midnight. 24-hour clock time is used in computers, military, public safety, and transport. In many Asian, European and Latin American countries people use it to write the time. Many European people use it in speaking. Many digital wristwatches and clocks can display the time of day using the 24-hour clock. In railway timetables 24:00 means the end of the day. For example, a train due to arrive at a station during the last minute of a day arrives at 24:00; but trains which depart during the first minute of the day go at 00:00. To write shop opening hours until midnight use, for example, "00:00–24:00", "07:00–24:00". Advantages over the 12-hour clock system:
References
12 hour to 24 hour Converter Converting a 12-hour time to 24-hour time is straight forward, though confusing. From 1:00 PM to 11:59 PM you add 12 hours, and from 12:00 AM (midnight) to 12:59 AM you subtract 12 hours. Or you can simply use the following calculator to convert to or from either system. Simply pick the hour (the minutes do not change) in either system and the other will change to match.
Notes: In the U.S. and Canada the 12-hour AM/PM format is still more commonly used. In these countries the 24-hour format is called 'Military time'. 22:00 on a 24-hour clock is is 10:00 PM on a 12-hour clock. This system is used throughout the world (not just the military) and leverages a 24-hour time clock rather than the 12-hour AM/PM system known to most English speaking countries. Below are ways to convert 22:00 through a time chart, automated converter, and how to convert the 24 hour clock into a 12-hour AM/PM system by hand.
22:00 Time Conversion ChartHow to convert 22:00 from 24-Hour Time to 12-Hour Standard TimeIt is easy to convert from 24-hour time to 12-hour time once you know a few tricks. The primary difference between the two is that the hours in a 24 hour clock go all the way up to 23 (from 0 to 23). In a 12-hour clock, the hour resets to 1 after noon (midday). Follow the steps below to convert 22:00 to 12-hour time.
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What is 22 on a 12 hour clock?
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