When is 11 am

The official according to an American, Australian and British dictionary , and most common, spelling for AM is "ante meridiem " which is a Latin phrase. I recommend that spelling! But people sometimes use the phrase "ante meridian" a "meridian" in this case refers to an imaginary line in the sky when the sun is at its highest point.

Example: means 10 Hours and 25 Minutes. It is better to use: PM or AM, or or Hour Clock which the railroads, airlines and military actually do. Example: on the hour. It runs from midnight to noon. The second period, marked pm, covers the 12 hours from noon to midnight.

Using numbers from 1 to 12, followed by am or pm, the hour clock system identifies all 24 hours of the day. 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.

Ante meridiem is commonly denoted as AM, am, a. Like many other sources, timeanddate. The main weakness of the 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. 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. However, most digital clocks and most sources, including timeanddate.

Although the precise moment of noon falls in neither category, the hour succeeding it, from to , is clearly after noon. 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. Another source of confusion is the lack of a date designator in the hour system, making it impossible to logically identify a correct moment in time when only a date and am midnight is provided.

Imagine being asked to pick up a friend at the airport at am on April Would you go there at midnight between April 12 and April 13? Or 24 hours later? One way to overcome this problem is to sacrifice accuracy for clarity.

Your friend could ask you to be at the airport at am on April 13 or, if the following midnight is meant, at pm on April