It is not.
4 pm is two thirds of a 24-hour day since midnight and 2/3 = 0.6667 (approx).
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1:00 AM equals 01:00 2:00 AM equals 02:00 3:00 AM equals 03:00 4:00 AM equals 04:00 5:00 AM equals 05:00 6:00 AM equals 06:00 7:00 AM equals 07:00 8:00 AM equals 08:00 9:00 AM equals 09:00 10:00 AM equals 10:00 11:00 AM equals 11:00 12:00 PM equals 12:00 1:00 PM equals 13:00 2:00 PM equals 14:00 3:00 PM equals 15:00 4:00 PM equals 16:00 5:00 PM equals 17:00 6:00 PM equals 18:00 7:00 PM equals 19:00 8:00 PM equals 20:00 9:00 PM equals 21:00 10:00 PM equals 22:00 11:00 PM equals 23:00 12:00 AM equals 00:00
There are 16 hours from 4 am to 8 pm. 4 am to 4 pm is 12 hours, then 4 pm to 8 pm is another 4 hours.
Third time's the charm.
It is seven hours from 9 AM to 4 PM.
9 a.m + 4 hours = 1 p.m.More generally, when you are doing modulus arithmetic, specifically mod 12.ie.(9+4) mod 12 = 1not as tough as 9 pm + 4 hours = 1 am