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WHICH IS CORRECT: 12 Midnight A.M. or 12 Midnight P.M.?
NEITHER: Twelve midnight A.M. and Twelve mignight P.M.or 00:00A.M. and 00:00P.M. mean nothing at all
They are simply the midpoints that devide the day into two equal halves.
Each every day begins exactly at midnight, and each A.M. begins precisely there after.Similarly, each P.M. begins immediately after noon. No meaning can be assigned to 12:00 AM (00:00 A.M.) or to 12: P.M. (00:00P.M), they are merely reference points meant to simplify time tables for us.
Along the same line, the universal day, established by the INTERNATIONAL CONVENTION in 1884 in WASHINGTON, D.C.U.S.A operates according to world time or universal time at GREENWICH, ENGLAND.
The logic regarding midnight and noon also applies to GREENWICH meantime commonly referred to as GMT or ZULU TIME, midnight and noon represent markers or "PAGE BREAKS" in the day and in the night, and may be represented by 00:00 o'clok.
GREENWICH ENGLAND, also holds the distinction of being at the point of ZERO LONGITUDE, where East meet West. The 1884 International agreement also recognized this line of zero degrees longtitude as the Prime Meridian, a point from which all points on the earth's surface are measured.