When emphasizing an exact or precise time, the abbreviations “a.m.” and “p.m.” are used. These two abbreviations stand for the Latin terms “ante meridiem” and “post meridiem,” which literally mean before noon and after noon. There are a few generally accepted ways to write these abbreviations in your writing.

Their official spelling is with the periods: A.M. and P.M. However, over time, language has evolved, and the spellings am and pm are acceptable when written in a certain way. The event will begin at 11 am. You have soccer practice at 5 pm. Also, using lowercase letters with or without periods is acceptable and actually more commonly used today.

AM means before noon. This is the 12-hour period from midnight to noon. PM means after noon. It covers the 12 hours from noon to midnight. Using numbers from 1 to 12, followed by am or pm, the 12-hour clock system identifies all 24 hours of the day.

Instead of AM and PM (in small caps), p.m. and a.m. -- with lowercase and periods -- are the preferred way to indicate time of day. According to the The Chicago Manual Style used by journalists.

2021年2月3日 · Follow these generally accepted guidelines to use a.m. and p.m. (or AM and PM) correctly in formal writing: Use the abbreviations a.m. and p.m. to indicate exact time. Use a.m. to refer to a time of day before noon, and p.m. to speak of a time between noon and midnight.

2023年12月22日 · To start, let’s discuss standard 12-hour clock that uses a.m. and p.m. Two commonly seen formats are 4pm and 4:00pm. Which is correct? The answer is: neither! Both renderings are incorrect. You need to insert periods and a space before the abbreviation, like this: 4 p.m. or 4:00 p.m.

The meaning of AM and PM is the simple abbreviation of Latin phrases. In particular, AM stands for ante meridiem, which translates into English as ‘before midday’. Meanwhile, PM is post meridiem and means in English ‘after midday’. These abbreviations are used to identify the time in the 12-hour clock format instead of using 24 hours.

Chicago Style recognizes two different ways of writing the “a.m.” and “p.m.” abbreviations. This first way is lowercase “a.m.” and “p.m.” The way requires periods and is preferred in Chicago Style. The second way is with small capitals “am” and “pm” This second way can appear with or without periods, making “am” and “a.m.” both acceptable.

There are six ways to write the abbreviations for ante meridiem (before noon) and post meridiem (after noon): Each of these—including “am” and “pm”—is a legitimate choice. For nearly a century, Chicago’s preferred form was the third: small capital letters with periods.

What is the Correct Form when writing the time – A.M. or a.m. or am? British style as laid down in the Oxford Guide to Style is 7.30 a.m. There is a note that in Scandinavia, North America and elsewhere the full point between the numerals is replaced by a …