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There are two primary methods of showing the time. First there's the 12 hour clock that uses AM and PM, and then there's the 24 hour clock.

显示时间的主要方法有两种。 首先是使用AM和PM的12小时制 ，然后是24小时制 。

Most countries prefer the 24 hour clock method, but the 12 hour clock is widely used in Latin America and English-speaking countries. In the 12 hour clock method, it is 12:00 twice a day at midnight (AM) and noon (PM).

大多数国家/地区更喜欢24小时制，但是12小时制在拉丁美洲和英语国家广泛使用。 在12小时制中，每天两次是午夜(AM)和中午(PM)的12:00。

The table below shows the conversion between the 12 hour and 24 hour clock systems:

下表显示了12小时制和24小时制之间的转换：

12小时制 (12 hour clock)

The day is split into two 12 hour periods running from midnight to noon (AM hours), and noon to midnight (PM hours).

一天分为两个12小时时段，从午夜到中午(AM小时)，从中午到午夜(PM小时)。

The abbreviations AM and PM are from Latin:

AM和PM的缩写来自拉丁语：

• AM: ante meridiem, before midday

  AM： 午夜之前

• PM: post meridiem, after midday

  下午： 午后 ，午后

24小时制 (24 hour clock)

The day runs from midnight to midnight and is divided into 24 hours from 0 (midnight) to 23. Time is shown in hours and minutes since midnight.

白天从午夜到午夜，从0(午夜)到23分为24小时。时间以午夜以来的小时和分钟表示。

从12小时制转换为24小时制 (Converting from 12 hour to 24 hour clock)

Starting from the first hour of the day (12:00 AM or midnight to 12:59 AM), subtract 12 hours:

从一天的第一小时(12:00 AM或午夜至12:59 AM)开始，减去12小时：

• 12:00 AM = 0:0012:00 AM = 0:00
• 12:15 AM = 0:1512:15 AM = 0:15

From 1:00 AM to 12:59 PM, the hours and minutes remain the same:

从1:00 AM到12:59 PM，小时和分钟保持不变：

• 9:00 AM = 9:009:00上午= 9:00
• 12:59 PM = 12:5912:59 PM = 12:59

For times between 1:00 PM to 11:59 PM, add 12 hours:

对于1:00 PM到11:59 PM之间的时间，请增加12小时：

• 3:17 PM = 15:173:17 PM = 15:17
• 11:59 PM = 23:59.11:59 PM = 23:59。

从24小时制转换为12小时制 (Converting from 24 hour to 12 hour clock)

Starting from the first hour of the day (0:00 / midnight to 0:59), add 12 hours and AM to the time:

从一天的第一小时(0:00 /午夜到0:59)开始，将12小时加AM：

• 0:30 = 12:30 AM0:30 = 12:30 AM
• 0:55 = 12:55 AM0:55 = 12:55 AM

From 1:00 to 11:59, simply add AM to the time:

从1:00到11:59，只需将AM添加到时间：

• 2:25 = 2:25 AM2:25 = 2:25 AM
• 9:30 = 9:30 AM9:30 = 9:30上午

For times between 13:00 to 23:59, subtract 12 hours and add PM to the time:

对于13:00到23:59之间的时间，请减去12小时并将PM添加到该时间：

• 16:55 = 4:55 PM16:55 =下午4:55
• 21:45 = 8:45 PM21:45 = 8:45下午

翻译自: https://www.freecodecamp.org/news/mathematics-converting-am-pm-to-24-hour-clock/

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