On the same day it is 12 hours
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12am is midnight. 12pm is noon.
No such time as 12 am !!!! Do you mean 12 midnight or 12 noon??? 'am' are the Latin initials for 'Ante Meridian' ; Before Noon. If it is midnight or noon it is NOT before or after noon. To answer your question, assuming you mean '12 midnight', then . from 5 pm to 12 midnight it is 7 hours. NB If you mean 12 noon then from 5 pm to the following 12 noon , it is 19 hours.
Strictly speaking, there is no 1200 PM. There's 12 noon and 12 midnight. 12 noon is 1200 hours.
There is no such time as 1200 am: there is 12 noon and 12 midnight. The question cannot, therefore, be answered.
Technically, 12 PM doesn't exist. It's either 12 noon (3 hours) or 12 midnight (15 hours).