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.

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.

Simply enter the 12-hour time value into the box on the left and select between ante meridiem (am) or post meridiem (pm) options. Hit the 'Convert' button. To convert 12 hour time to 24 hour time format we follow the steps below: If the time is between 12:00 AM and 12:59 AM, we …

2009年8月13日 · am和pm都是用来表示时间的，具体标识如下： AM:(0:00-12:00)ante meridiem or ante meridian; 上午 PM:(12:00-24:00)post meridiem or post meridian; 下午

大多数数字时钟和大多数来源，将午夜定为12 am，中午定为12 pm。虽然正午的准确时间不属于这两类，但它之后的时间，从12:00:01到12:59:59，显然是正午以后。为了避免混淆，当提到中午或午夜时，我们建议使用12 noon和12 midnight 。

The Free Online Alarm Clock makes it easy to set an alarm for 8:00 AM (eight o'clock AM) and stay on schedule. Whether you need a reminder for a specific task, a wake-up call, or a notification at a precise time, this tool allows you to set …

Below are ways to convert 08:00 through a time chart, automated calculator, and ways to convert by hand. A quick cheatsheet for all time conversions like 8:00 AM. Click the clock. Select your time. We'll highlight the row for the time you choose. It is easy to convert from 24-hour time to 12-hour time once you know a few tricks.

2009年6月3日 · 上午八点 = 8am， 8：00 am。 下午三点 = 3pm，3：00 pm， 晚上20点=晚上8点=8pm，8：00pm， pm 是从中午12pm到晚上11：59pm am是从晚上12am 到中午11：59am am pm 与12小时制有关，而与白天黑夜关系不紧密

對於很多習慣 24 小時制的人來說，常常分不清楚 am 和 pm 到底哪個代表上午或下午。其實，不用特別去記它們兩者原本的拉丁文，只要用 a 正是 26 個英文字母的開頭第一個字母，代表「起始、開頭」這個原理，就可以很容易推斷 am 是代表上午啦！ 😀

首先，a.m. 代表的是早上的时间，全称为拉丁语的 ante meridiem，意指从午夜12点（00:00）到正午12点（12:00）。 而 p.m. 则表示下午的时间，全称是 “post meridiem”，涵盖从正午12点（12:00）到午夜12点（00:00）的时间段。