12-hour clock

12-hour clock: Time counting system

The 12-hour clock is a way of dividing the 24 hours of the day into two sections. The two halves are called ante meridiem (a.m.) and post meridiem (p.m.).

A typical analog 12-hour clock

Both names are from Latin, and numbered from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12. Time from midnight to noon is a.m. and from noon to midnight p.m. The table at right shows how it relates to the 24-hour clock.

24-hour clock12-hour clock
00:0112:01 AM
01:001:00 AM
02:002:00 AM
03:003:00 AM
04:004:00 AM
05:005:00 AM
06:006:00 AM
07:007:00 AM
08:008:00 AM
09:009:00 AM
10:0010:00 AM
11:0011:00 AM
12:0012:00 PM
13:001:00 PM
14:002:00 PM
15:003:00 PM
16:004:00 PM
17:005:00 PM
18:006:00 PM
19:007:00 PM
20:008:00 PM
21:009:00 PM
22:0010:00 PM
23:0011:00 PM
00:0012:00 AM

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