The official (according to an American, Australian and British dictionary I checked), and most common spelling for AM is "ante meridiem" which is a Latin phrase. Should "AM" be "ante meridiem" or "ante meridian" (likewise for PM)? In these countries, the 24-hour format is called 'Military time'. The United States, Great Britain, Ireland, Canada, Australia or New Zealand the 12-hour AM/PM format is still more commonly used. Note: "12 AM" and "12 PM" can cause confusion, so we prefer "12 Midnight" and "12 Noon".Ģ4-hour clock – where is it used? The 24-hour time clock system is the most used in the world and is the international standard notation of time. Here is a side-by-side comparison of the 24-Hour Clock (military time) and AM/PM: Leave the noon hour as-is, but remove "PM." Add 12 to the hours between 1:00 and 11:59 PM and eliminate "PM.ġ2-24 Time Conversion Chart - Military conversion table Eliminate “AM” for the hours between 1:00 and 11:59 AM. Use 00:00 to signify midnight in a 24-hour time. To convert from 24hours to PM you subtract time (Subtract 12 from 13:00 to 23:59 and include “PM”).Add the signifier “PM” for 12:00 to 12:59.Include the signifier “AM” for times between 1:00 and 11:59.To convert from PM to 24 hours you need to add 12 (add 12 to the first hour of the day and include “AM.”). ![]() AM = first 12 hours of the day PM = next 12 hours of the day Converting 24-Hour Time to 12-Hour Time Converting from 24-hour time to 12-hour time can cause confusion.
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