Since there are two periods of time, a.m. and p.m. , 24 hours (the time in a day) needs to be split in two. 24 split in two is obviously 12.That is why there is twelve hours on a clock.
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gmt
A normal clock has twelve hours and it goes through two cycles of that period every day. There are occasions when you need to know whether it the time referred to is in the fist cycle (midnight to noon = am) or the second (noon to midnight = pm).
It is noon for mid-day