As a kid, I always thought “at morning” and “post morning.” But actually, the appreciated term A.M. stands for “ante meridiem,” which is a Latin term for “before noon.” It’s used to indicate that a time is in the morning, before 12:00 p.m. (noon). We also know it as the hour after midnight.

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.

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.

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.

2019年10月3日 · P.m. is an abbreviation of post merīdiem, meaning—you guessed it—“after midday.” These two terms help keep ambiguity at bay in the 12-hour time system. What does m. mean? There is a third, lesser-known abbreviation in this system: m. From the Latin merīdiēs (“midday”), it means “noon.”

P.M. definition: 1. used when referring to a time in the afternoon or evening or at night: 2. abbreviation for…. Learn more.

Convert 12 hour time format to 24 hour clock time format, how to calculate 12h AM and PM clock time to 24h time including time conversion table.

P.M. definition: 1. used when you are referring to a time after 12 o'clock in the middle of the day, but before 12…. Learn more.

2025年3月19日 · 6 PM corresponds to 6 pm or 6 o’clock in the evening. You should be particularly careful with midnight (12 AM) and midday (12 PM) to avoid misunderstandings. The PM AM time notation may seem complicated at first. But it is easy to learn with practice. It offers an alternative way of telling the time and is very important internationally.

PM means post meridiem (after noon) and AM means before noon, so there is confusion as to what noon is, but there is no confusion that the hour after noon is PM, so 12:01-12:59 is PM, post meridiem, after the sun has passed the meridian.