Do I Capitalize AM and PM? 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.

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.

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.

Ante meridiem is commonly denoted as AM, am, a.m., or A.M.; post meridiem is usually abbreviated PM, pm, p.m., or P.M. Like many other sources, timeanddate.com uses “am” and “pm” when using the 12-hour format, but the other variants are equally correct and widely used.

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.

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.

AP Style time of day holds that the time descriptors “ante meridiem” (before noon) and “post meridiem” (after noon) should be abbreviated with lowercase letters and with periods (a.m. and p.m.). AP warns against redundancies in your writing such as“10 a.m. this morning.” For instance, Wrong: We have breakfast planned for 10 a.m. Monday morning.

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.

2024年10月22日 · AM stands for Ante Meridiem, meaning "before midday," while PM stands for Post Meridiem, meaning "after midday." These abbreviations play a crucial role in differentiating the two 12-hour periods that make up a 24-hour day.

2016年5月16日 · “AM” stands for the Latin phrase Ante Meridiem —which means “before noon”—and “PM” stands for Post Meridiem : “after noon.” Although digital clocks routinely label noon “12:00 PM” you should avoid this expression not only because it is incorrect, but because many people will imagine you are talking about midnight instead.