| Most countries around the world today use the 24-hour system | From 0:00 midnight to 0:59, add 12 hours and use am |
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| From 12:00 to 12:59, just add pm after the time | The Egyptians are thought to be responsible for dividing the day into 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.
27| com uses am and pm, but the other variants are equally correct and widely used | From 1:00 to 11:59, just add am after the time |
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| Although the precise moment of noon falls in neither category, the hour succeeding it, from 12:00:01 to 12:59:59, is clearly after noon | Topics: , Coordinated Universal Time UTC 19:49: 05 Thursday, 22 July 2021 UTC is the common time standard across the world |
| Your friend could ask you to be at the airport at 12:01 am on April 13 or, if the following midnight is meant, at 11:59 pm on April 13 | Like many other sources, timeanddate |
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| Why Does the Day Have 24 Hours? For example, at 23:00, 23 hours have passed since the beginning of the current day | The first 12-hour period is designated as am |
com, designate midnight as 12 am and noon as 12 pm.
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