The initials a.m. stand for ante meridian, Latin for "before noon." The initials p.m. stand for post meridian, Latin for "after noon."
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PM means at night or at noon
AM is 00:00 to 11:59. PM is 12:00 to 23:59.
PM is an abbreviation for Post meridiem; Latin for after noon. Incidentally, AM stands for Ante meridiem - before noon.
It's neither, 12 noon and 12 midnight are just that although there are a lot of illiterates in positions where they should know better!)
it is pm. when it gets to noon, it is pm