![]() The Egyptians are thought to be responsible for dividing the day into 24 equal parts. However, the 12-hour format, including am and pm, is officially used in a number of countries, including the United States, Canada (except Québec), Australia, New Zealand, and the Philippines. Most countries around the world today use the 24-hour system. ![]() Here's how to convert time on a 24-hour clock to the 12-hour system:įrom 0:00 (midnight) to 0:59, add 12 hours and use am.įrom 1:00 to 11:59, just add am after the time.įrom 12:00 to 12:59, just add pm after the time.įrom 13:00 to 0:00, subtract 12 hours and use pm. To convert am or pm time to the 24-hour format, use these rules:įrom midnight to 12:59 am, subtract 12 hours. For example, at 23:00, 23 hours have passed since the beginning of the current day. Starting at midnight, hours are numbered from 0 to 24, removing the need for designations like am and pm. Time Formats 12-hourĪ 24-hour clock, sometimes referred to as military time, states the time according to the number of hours that have passed since midnight. Here, 0:00 refers to midnight at the beginning of the day while 24:00 is midnight at the end of the day. Alternatively, the 24-hour format could be used. Your friend could ask you to be at the airport at 12:01 am on April 13 or, if the following midnight is meant, at 11:59 pm on April 13. One way to overcome this problem is to sacrifice accuracy for clarity. Would you go there at midnight between April 12 and April 13? Or 24 hours later? Imagine being asked to pick up a friend at the airport at 12:00 am on April 13. Midnight ConfusionĪnother source of confusion is the lack of a date designator in the 12-hour system, making it impossible to logically identify a correct moment in time when only a date and 12:00 am (midnight) is provided. To avoid any confusion when referring to the precise moment of noon or midnight, we recommend using the designations 12 noon and 12 midnight instead. Although the precise moment of noon falls in neither category, the hour succeeding it, from 12:00:01 to 12:59:59, is clearly after noon. However, most digital clocks and most sources, including, designate midnight as 12 am and noon as 12 pm. For example, the moment of midnight occurs precisely 12 hours after noon on the previous day and 12 hours before noon on the following day. The main weakness of the 12-hour system is a widespread confusion about which abbreviation should be used for noon and midnight: neither moment can logically be identified as before noon (am) or after noon (pm). What is solar noon? Midnight and Noon: AM or PM? ![]() Like many other sources, uses am and pm, but the other variants are equally correct and widely used. post meridiem is usually abbreviated PM, pm, p.m., or P.M. For example, 5 am is early in the morning, and 5 pm is late in the afternoon 1 am is one hour after midnight, while 11 pm is one hour before midnight.Īnte meridiem is commonly denoted as AM, am, a.m., or A.M. ![]() Using numbers from 1 to 12, followed by am or pm, the 12-hour clock system identifies all 24 hours of the day. The abbreviations am and pm derive from Latin: The second period, marked pm, covers the 12 hours from noon to midnight. The first 12-hour period is designated as am. The 12-hour system divides the 24 hours of a day into two periods lasting 12 hours each. Business Date to Date (exclude holidays). ![]()
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