It is very important to remember that a Twelve Hour Clock has only Two divisions of Twelve hour periods and that the Thirteenth Hour does not exist. An am time period ends at 12:00 and a pm time period starts immediately the time has passed a split nano second after the Twelfth hour and begins at zero. So technically speaking there is no true time of Twelve Twenty in the use of the Twelve Hour Clock for example. It is a misnomer. Twelve Twenty does exist, however, in the Twenty Four Hour Clock.

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