Some countries, including the US, Canada, và Australia, use the 12-hour cloông xã format including am và pm. What bởi vì these abbreviations mean? Is midnight am or pm?
12-hour clock at noon: 12 am or 12 pm?
Two 12-Hour Periods
The 12-hour system divides the 24 hours of a day into lớn two periods lasting 12 hours each. The first 12-hour period is designated as am. It runs from midnight lớn noon. The second period, marked pm, covers the 12 hours from noon to lớn midnight.
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The abbreviations am & pm derive from Latin:
AM = Ante meridiem: Before noonPM = Post meridiem: After noonUsing numbers from 1 lớn 12, followed by am or pm, the 12-hour clochồng system identifies all 24 hours of the day. For example, 5am is early in the morning, and 5pm is late in the afternoon; 1am is one hour after midnight, while 11pm is one hour before midnight.
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, realchampionshipwrestling.com uses am and pm, but the other variants are equally correct và widely used.
What is solar noon?
Midnight and Noon: AM or PM?
The main weakness of the 12-hour system is a widespread confusion about which abbreviation should be used for noon và midnight: neither moment can logically be identified as before noon (am) or after noon (pm). For example, the moment of midnight occurs precisely 12 hours after noon on the previous day và 12 hours before noon on the following day.
However, most digital clocks và most sources, including realchampionshipwrestling.com, designate midnight as 12am & noon as 12pm. Although the precise moment of noon falls in neither category, the hour succeeding it, from 12:00:01 lớn 12:59:59, is clearly after noon.
To avoid any confusion when referring to lớn the precise moment of noon or midnight, we recommkết thúc using the designations 12noon và 12midnight instead.
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Midnight Confusion
Another source of confusion is the lack of a date designator in the 12-hour system, making it impossible to logically identify a correct moment in time when only a date và 12:00am (midnight) is provided.
Imagine being asked khổng lồ piông chồng up a friend at the airport at 12:00am on April 13. Would you go there at midnight between April 12 & April 13? Or 24 hours later?
One way to lớn overcome this problem is khổng lồ sacrifice accuracy for clarity. Your frikết thúc could ask you to be at the airport at 12:01am on April 13 or, if the following midnight is meant, at 11:59pm on April 13. Alternatively, the 24-hour format could be used. Here, 0:00 refers to lớn midnight at the beginning of the day while 24:00 is midnight at the over of the day.
Time Formats
| 12:00 (midnight) | 0:00 (beginning of the day) |
| 12:01 am | 0:01 |
| 1:00 am | 1:00 |
| 2:00 am | 2:00 |
| 3:00 am | 3:00 |
| 4:00 am | 4:00 |
| 5:00 am | 5:00 |
| 6:00 am | 6:00 |
| 7:00 am | 7:00 |
| 8:00 am | 8:00 |
| 9:00 am | 9:00 |
| 10:00 am | 10:00 |
| 11:00 am | 11:00 |
| 12:00 (noon) | 12:00 |
| 12:01 pm | 12:01 |
| 1:00 pm | 13:00 |
| 2:00 pm | 14:00 |
| 3:00 pm | 15:00 |
| 4:00 pm | 16:00 |
| 5:00 pm | 17:00 |
| 6:00 pm | 18:00 |
| 7:00 pm | 19:00 |
| 8:00 pm | 20:00 |
| 9:00 pm | 21:00 |
| 10:00 pm | 22:00 |
| 11:00 pm | 23:00 |
| 12:00 (midnight) | 24:00 (kết thúc of the day) |
Converting 12-Hour to lớn 24-Hour Format
A 24-hour cloông chồng, sometimes referred khổng lồ as military time, states the time according to lớn the number of hours that have sầu passed since midnight. Starting at midnight, hours are numbered from 0 lớn 24, removing the need for designations lượt thích am và pm. For example, at 23:00, 23 hours have sầu passed since the beginning of the current day.
To convert am or pm time to the 24-hour format, use these rules:
From midnight to 12:59am, subtract 12 hours.12:49am = 0:49 (12:49 – 12)
From 1am khổng lồ noon, bởi vì nothing.11:49am = 11:49
From 12:01pm lớn 12:59pm, vì nothing.12:49pm = 12:49
From 1:00pm to lớn midnight, add 12 hours.1:49pm = 13:49 (1:49 + 12)
Here"s how lớn convert time on a 24-hour cloông xã khổng lồ the 12-hour system:
From 0:00 (midnight) to lớn 0:59, add 12 hours and use am.0:49 = 12:49am (0:49 + 12)
From 1:00 lớn 11:59, just add am after the time.11:49 = 11:49am
From 12:00 to 12:59, just add pm after the time.12:49 = 12:49pm
From 13:00 lớn 0:00, subtract 12 hours & use pm.13:49 = 1:49pm (13:49 - 12)
Where Is the 12-Hour Format Used?
Most countries around the world today use the 24-hour system. However, the 12-hour format, including am và pm, is officially used in a number of countries, including the United States, Canada (except Québec), Australia, New Zeal&, & the Philippines.
Why Does the Day Have 24 Hours?
The Egyptians are thought to be responsible for dividing the day inlớn 24 equal parts. One account suggests that this custom evolved because the Egyptians commonly used the base 12, counting the 3 joints in their fingers, not including the thumb.