AM stands for ante meridiem and PM stands for post meridiem, representing the hours before and after noon on a 12-hour clock.

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 …

May 25, 2018 · I know that AM/PM is for ante/post meridiem, but what is it actually called? Meridian indicator? 12 hour indicator? Something way more clever?

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 。 混淆的另一个来源是在12小时系统中缺少日期指示器，这使得当只提供日期和12:00 am (午夜)时，不可能从逻 …

Jun 10, 2015 · From several sources, including english.stackexchange.com, one should write 3 p.m. instead of 3 PM. How did the all-capitals variant appear, and especially why? Is it …

Displays current local time in the United States, including time zones and a time zone map for each state.

12 小时制将一天中的 24 小时分为两个时段，每个时段持续 12 小时。 第一个时间段指定为上午，标记为am，它从午夜运行到中午。 第二个时段，标记为 pm，涵盖从中午到午夜的 12 个小 …

Current local time in Australia – Victoria – Melbourne. Get Melbourne's weather and area codes, time zone and DST. Explore Melbourne's sunrise and sunset, moonrise and moonset.

有一种说法是：罗马人的am是与现代人相反的，3a.m.代表中午前3小时，也就是今天的9a.m.，所以12a.m.就是凌晨。 后来转换成现代记法的时候保留了12a.m.就变成了现在这种怎么都说不 …

只有日本用 0～11 的 12 小时制，中午十二点半是「午後0:30」。如果写成了 pm，默认看作英文语境，一般使用 1～12 的 12 小时制，则应是「12:30 pm」。