What Do AM and PM Stand For? By Aparna Kher and Konstantin Bikos Some countries use the 12-hour clock format with “am” and “pm” labels. What do these abbreviations mean? Is midnight am or pm?

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 个小时。 AM = Ante meridiem : 中午之前 PM = Post meridiem : 中午之后 12小时和24小时 …

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12 小时制中，pm / am 什么时候该用大写，什么时候用小写？

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