AM and PM: What Do They Mean? - timeanddate. com 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?
中文的上午和下午与am pm时间区间理解！？ - 知乎 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小时制时间表示对应表 12点如何表达？ 中午12点应为：12:00 noon 夜里12点应为
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