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 usually 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:
Page 224-hour clock is available in 30 other languages. Return to 24-hour clock
If you’ve ever been stumped when you see a clock read something like 14:24, it's probably because you’re unfamiliar with 24-hour time. This form of timekeeping is commonly used in the U.S. military, Europe, and other parts of the world. Fortunately, it’s super simple to convert from 24-hour time to 12-hour (or standard) time and back. Remember that you only need to convert the hours—the minutes always stay the same.
This article was co-authored by wikiHow staff writer, Sophia Latorre. Sophia Latorre is a Content Manager on the wikiHow team. Before joining wikiHow, Sophia worked as a technical editor and was published in six International Energy Agency (IEA) Wind Annual Reports. Now, she writes, edits, and reviews articles for the wikiHow Content Team, working to make the content as helpful as possible for readers worldwide. Sophia holds a BA in English from Colorado State University. This article has been viewed 1,197,751 times.
Co-authors: 61 Updated: August 26, 2022 Views: 1,197,751 Article Rating: 56% - 73 votes Categories: Teaching Children Skills
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