A.M. and P.M.
What is Noon and Midnight?
A.M. and P.M. start immediately after Midnight and Noon (Midday) respectively.
This means that 00:00 A.M. or 00:00 P.M. (or 12:00 A.M. and 12:00 P.M.) have no
meaning.
Every day starts precisely at midnight and A.M. starts immediately after
that point in time e.g. 00:00:01 A.M. (see also leap
seconds)
To avoid confusion timetables, when scheduling around midnight, prefer to use
either 23:59 or 00:01 to avoid confusion as to which day is being referred to.
It is after Noon that P.M. starts e.g. 00:00:01 PM (12:00:01)
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A.M. abbreviation ante meridiem
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P.M. abbreviation post meridiem
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Main Entry: an·te me·ri·di·em
Pronunciation:
"an-ti-m&-'ri-dE-&m, -dE-"em
Function: adjective
Etymology: Latin
Date: 1563
Meaning: being before noon
Abbreviation a.m.
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Main Entry: post me·ri·di·em
Pronunciation:
-m&-'ri-dE-&m, -"em
Function: adjective
Etymology: Latin
Date: 1647
Meaning: being after noon
Abbreviation p.m.
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