- AM and PM: What Do They Mean? - timeanddate. com
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
- 如何使用am，pm表示时间？ - 知乎
你的朋友可以让你在4月13日凌晨00:01（12:01 am）到达机场，或者，如果要在下一个午夜到达，那就在4月13日晚上11:59（11:59 pm ）到达。或者，24小时格式也可以使用。这里0:00是指一天开始的午夜，而24:00是一天结束的午夜。 12小时制转24小时制：12:49 am = 0:49 (12:49 – 12)
- Date Calculator: Add to or Subtract From a Date - timeanddate. com
The Date Calculator adds or subtracts days, weeks, months and years from a given date
- 在十二制时间（am pm）的约定俗成里，12pm和12am到底表示何时？ 有0pm 这种表示方法吗？ - 知乎
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通的东西了。
- Date Duration Calculator: Days Between Dates - timeanddate. com
The Duration Calculator calculates the number of days, months and years between two dates
- Current Local Time in Cork, Ireland (Corcaigh) - timeanddate. com
Current local time in Ireland – Cork Get Cork's weather and area codes, time zone and DST Explore Cork's sunrise and sunset, moonrise and moonset
- Current Local Time in the United States - timeanddate. com
United States time now USA time zones and time zone map with current time in each state
- Current Local Time in Long Beach, California, USA
Current local time in USA – California – Long Beach Get Long Beach's weather and area codes, time zone and DST
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