Midnight and Noon: AM or PM? Which Abbreviation Is Correct? 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. The main ...

I used to think PM/AM was correct, but at some point, I switched to using p.m./a.m. for reasons I can't recall. I know that in practical, casual writing, people tend to use whatever form is most convenient to them, but I'm curious about what the official usage—should it exist—actually is.

6:53 am – 7:20 am 7:36 pm – 8:02 pm. Previous Moon Phase. Full Moon March 14, 2025 5:54 pm. Next Moon ...

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 个小时。 AM = Ante meridiem : 中午之前. PM = Post meridiem : 中午之后

2019年10月15日 · am/pm 用的时候一定要紧跟时间，不能机械地去替代morning和afternoon。 比如你可以说 7am，大家都知道是上午7点；同时相信你绝对不会说出'Good am.'这样的话 。

United States time now. USA time zones and time zone map with current time in each state.

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 。

6:08 am – 6:32 am 6:28 pm – 6:52 pm. Previous Moon Phase. First Quarter March 6, 2025 10:01 pm. Next ...

6:22 am – 6:47 am 7:23 pm – 7:49 pm. Previous Moon Phase. First Quarter March 7, 2025 3:31 am. Next ...

6:34 am – 7:00 am 6:53 pm – 7:18 pm. Previous Moon Phase. First Quarter March 6, 2025 10:31 am. Next ...