The clock was most probably implemented into the game so that people could change their time when daylight savings time kicked in, not so people could jump about all they wanted and get things before everyone else.
Besides, we never said it was hacking, we said a muted down version of hacking, aka cheating. If going to any date you like and doing stuff/getting stuff that other people can't even think about doing/getting before that actual date comes around isn't cheating then I don't know what is.
If Nintendo intended you to jump around in time so you could do things whenever you liked they wouldn't advertise the game to simulate a real-life clock, nor would they make weeds and stuff appear in your town when you jumped that far forwards.
Ok, I'm assuming this is what you're referring to, since all your posts for a few pages after that just refers to time traveling as cheating, with no reason why. As for this post...
First paragraph: I see how this could be a valid point,but as you said, that's why it was probably put in. That's not the definite reason it was.
Second paragraph: That's what you consider cheating. Not what is cheating.
Third paragraph: If Nintendo really didn't want you just changing the clock as you pleased, they would do something to prevent it, no?