2009年8月13日 · am和pm都是用来表示时间的，具体标识如下： AM:(0:00-12:00)ante meridiem or ante meridian; 上午 PM:(12:00-24:00)post meridiem or post meridian; 下午

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。

Under the 24-hour clock system, the day begins at midnight, 24:00, and the last minute of the day begins at 23:59 and ends at 24:00, which is identical to 24:00 of the following day. [source?] 12:00 can only be noon – midday. Midnight is called 24:00 and used to mean the end of the day. It is also used to mean the beginning of the day.

Simply enter the 12-hour time value into the box on the left and select between ante meridiem (am) or post meridiem (pm) options. Hit the 'Convert' button. To convert 12 hour time to 24 hour time format we follow the steps below: If the time is between 12:00 AM and 12:59 AM, we …

2021年2月12日 · 08:00 pm in the 24-hour clock time convention is 20:00. Civilian time and railway time are frequently used synonym with the twenty-four hour clock. 08:00 P.M. is the 12-hour clock time convention equivalent of 20:00 in 24-hour time.

P.M. = Post Meridiem（拉丁文，表示中午之後、下午，after midday），可等於 pm、p.m.、PM 雖然寫法上可大寫或小寫，可加點或不加點，但最常使用且用於正式寫作裡的寫法還是大寫且不加點的 AM 和 PM。

“am”和“pm”分别表示什么时间？ 时间am的全称是 ante meridiem(before noon)， 上午 （0：00-12：00）。 时间pm的全称是post meridiem (=afternoon) ，下午（12：01-24：00)。

PM means after noon. It covers the 12 hours from noon to midnight. Using numbers from 1 to 12, followed by am or pm, the 12-hour clock system identifies all 24 hours of the day. For example, 1 am is one hour after midnight, and 5 am is early in the morning; 5 pm is late in the afternoon, while 11 pm is one hour before midnight.

2009年6月3日 · 若用24小时制， 不用附am或pm. 而是附上hrs (1500hrs, 下午3点的意思） 20点 （2000hrs) 是 8pm 或 8 at night. pm指的是过了中午时1点到晚上11点。 (1pm to 11pm) 在外国很小24小时算的，他们都是说早上或是说晚上的。 叫中午的12：00是noon。 早上是AM,中午后是PM. 半夜的12：00后是是AM. 中午12:00后是PM. 午夜的12：00后到第二天的中午12：00前是AM. 所以你工作中要记录的事情是下午和晚上没有过午夜的都是PM。 当然你想用24小时的说法就 …

Use the calculators below to find the number of hours and minutes between two times. For a full time card, please use the Time Card Calculator. An hour is most commonly defined as a period of time equal to 60 minutes, where a minute is equal to 60 seconds, and a second has a rigorous scientific definition. There are also 24 hours in a day.