| ; post meridiem is usually abbreviated PM, pm, p | Here, 0:00 refers to midnight at the beginning of the day while 24:00 is midnight at the end of the day |
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| It runs from midnight to noon | From 1:00 pm to midnight, add 12 hours |
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.
16| The second period, marked pm, covers the 12 hours from noon to midnight | The abbreviations am and pm derive from Latin:• However, most digital clocks and most sources, including timeanddate |
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| For example, at 23:00, 23 hours have passed since the beginning of the current day | To avoid any confusion when referring to the precise moment of noon or midnight, we recommend using the designations 12 noon and 12 midnight instead |
The first 12-hour period is designated as am.
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