![]() In the US, the 24-hour clock is used in specialist areas, such as: The count of hours after 12:59 PM is simply continued, so that 1:00 PM equals 13:00, 6:24 PM equals 18:24, and so on. Next, the times between midnight and 12:59 PM in the 24-hour clock format are the same as in the 12-hour format, with the exception of the AM/PM abbreviations, which are omitted in the former. But, unlike standard US time, by using the 24-hour clock, we would indicate midnight as 00:00. ![]() On the other hand, the 24-hour clock uses a unique number for each hour of the day, starting at 12:00 AM or midnight. Post meridiem (after noon) - PM or p.m.Ante meridiem (before noon) - AM or a.m.These abbreviations come from Latin terms: We see here that the US standard time uses the abbreviations “a.m.” and “PM” to signify time before noon and time after noon, respectively. 3:30 PM - Half past three in the afternoon.So, here are a couple of examples to illustrate the standard format used in the US to show time: Second block - starts at noon (12:00 p.m.) and ends at midnight (12:00 a.m.).First block - starts at midnight (12:00 a.m.) and ends at noon (12:00 p.m.).This clock splits the day into two blocks of time: The standard US timekeeping method uses the 12-hour clock. USA Timekeeping Law How is military time different from standard US time? The use of the 24-hour clock format is also encouraged by ISO 8601 international standards - established with the intention to provide clear and specific ways to communicate date and time. This timekeeping standard is widely used around the world, except in the US and several other countries, such as the following: Subscribe to and receive customized updates delivered straight to your inbox.Military time is a US term used to describe a timekeeping method otherwise known as the 24-hour clock. military, as well as critical info about how to join and all the benefits of service. Army didn't officially adopt military time until 1942.īe sure to get the latest news about the U.S. Navy began using the 24-hour clock in 1920, after becoming familiar with it during World War I. The 24-hour clock had already been employed throughout Europe for years before the U.S. It's also an authoritative source of time and a set of methods to disseminate synchronized time worldwide."Īlthough the phrase "military time" is commonly used, this time system was not invented by the military. "Military time, therefore, is more than a method for counting the hours. "Precise time is crucial to navigation, geographical positioning for locating forces and targets, and secure communications," according to the Encyclopedia of Military Science. Military routines and operations demand precision, and the use of the 24-clock system prevents any confusion over a.m. One of the main advantages of using military time is eliminating ambiguity. Read More: Military Lingo for New Military Spouses Military Time Chart 12-Hour Clock For example, for 2000 hours, subtract 12 from 20 to get 8 p.m. The day ends just before midnight at what civilians would call 11:59 p.m., but which in military time is 23:59, or twenty-three fifty-nine hours.įor those still learning the 24-clock system, a simple way to translate afternoon and evening hours into civilian time is to subtract 12. The military references to the afternoon and evening hours often take new enlistees in basic training longer to learn by heart.Īfter noon, instead of starting over with 1, military time continues chronologically, so that 1 p.m. This ease continues through midday, which is 1200 (twelve hundred) hours. The morning hours are simple enough to understand. in civilian time is written simply as 0630 in military time. ![]() In the four-digit expression of time, no colon separates the hours and minutes.
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