爱华网英语时间表示中AM/PM制与24小时制的转换方法
Showing theTime
There are twomajor ways to show the time: "24 Hour Clock" or"AM/PM".
Converting AM/PM to 24 HourClock
For the first hour of the day (12 Midnight to 12:59 AM),subtract 12 Hours
Examples:12 Midnight = 0:00, 12:35 AM = 0:35
From 1:00 AM to 12:59 PM, no change
Examples:11:20 AM = 11:20, 12:30 PM = 12:30
From 1:00 PM to 11:59 PM, add 12 Hours
Examples:4:45 PM = 16:45, 11:50 PM = 23:50
Converting 24 Hour Clock toAM/PM
For the first hour of the day(0:00 to 0:59), add 12 Hours, make it "AM"
Examples:0:10 = 12:10 AM, 0:40 = 12:40 AM
From 1:00 to 11:59, just make it"AM"
Examples:1:15 = 1:15 AM, 11:25 = 11:25 AM
From 12:00 to 12:59, just make it"PM"
Examples:12:10 = 12:10 PM, 12:55 = 12:55 PM
From 13:00 to 23:59, subtract 12Hours, make it "PM"
Examples:14:55 = 2:55 PM, 23:30 = 11:30 PM
Midnight andNoon
"12 AM" and "12 PM" can cause confusion, so we prefer "12Midnight" and "12 Noon".
What Day isMidnight?
Midnight has another problem - there is nothing totell you "is this the beginning or ending of the day".
Imagine you are told your friends are leaving forholiday at "midnight" on 12th March, what day should you arrive tosay goodbye? Do you get there on the 11th (assuming they leave atthe very start of the 12th), or the 12th (assuming they leave atthe end of the 12th)?
It is better to use:
which the railroads, airlines and military actuallydo.
So, if you see something like "offer ends midnightOctober 15th" tell them to use one minute before or after so thereis no confusion!
Comparison Chart
Here is a side-by-side comparison of the 24 Hour Clock andAM/PM:
Example: on the hour | Example: 10 minutes past | |||
24 Hour Clock | AM / PM | 24 Hour Clock | AM / PM | |
0:00 | 12 Midnight | 0:10 | 12:10 AM | |
1:00 | 1:00 AM | 1:10 | 1:10 AM | |
2:00 | 2:00 AM | 2:10 | 2:10 AM | |
3:00 | 3:00 AM | 3:10 | 3:10 AM | |
4:00 | 4:00 AM | 4:10 | 4:10 AM | |
5:00 | 5:00 AM | 5:10 | 5:10 AM | |
6:00 | 6:00 AM | 6:10 | 6:10 AM | |
7:00 | 7:00 AM | 7:10 | 7:10 AM | |
8:00 | 8:00 AM | 8:10 | 8:10 AM | |
9:00 | 9:00 AM | 9:10 | 9:10 AM | |
10:00 | 10:00 AM | 10:10 | 10:10 AM | |
11:00 | 11:00 AM | 11:10 | 11:10 AM | |
12:00 | 12 Noon | 12:10 | 12:10 PM | |
13:00 | 1:00 PM | 13:10 | 1:10 PM | |
14:00 | 2:00 PM | 14:10 | 2:10 PM | |
15:00 | 3:00 PM | 15:10 | 3:10 PM | |
16:00 | 4:00 PM | 16:10 | 4:10 PM | |
17:00 | 5:00 PM | 17:10 | 5:10 PM | |
18:00 | 6:00 PM | 18:10 | 6:10 PM | |
19:00 | 7:00 PM | 19:10 | 7:10 PM | |
20:00 | 8:00 PM | 20:10 | 8:10 PM | |
21:00 | 9:00 PM | 21:10 | 9:10 PM | |
22:00 | 10:00 PM | 22:10 | 10:10 PM | |
23:00 | 11:00 PM | 23:10 | 11:10PM | |
摘自：http://www.gzilc.org/news/html/827.html
