| From 1 am to noon, do nothing | The abbreviations am and pm derive from Latin:• To convert am or pm time to the 24-hour format, use these rules:• Most countries around the world today use the 24-hour system |
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| Etymology 2 [ ] This is missing or incomplete | From 1:00 pm to midnight, add 12 hours |
| The main weakness of the 12-hour system is a widespread confusion about which abbreviation should be used for noon and midnight: neither moment can logically be identified as before noon am or after noon pm | The first 12-hour period is designated as am |
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| 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 | 12-hour clock at noon: 12 am or 12 pm? The Egyptians are thought to be responsible for dividing the day into 24 equal parts |
From 12:01 pm to 12:59 pm, do nothing.
| Please add to it, or discuss it at the | 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 |
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| Ante meridiem is commonly denoted as AM, am, a | It runs from midnight to noon |
Imagine being asked to pick up a friend at the airport at 12:00 am on April 13.