I've always been baffled by this question as well.

Time is just something that never ends... we can never truly be in the present.. because right as we think we are in the 'present,' time passes and becomes the past...

Also, time must have existed before the earth was even created, and time will continue even if there is nothing in the universe alive... Time just is what it is, in this moment.
I do believe that seeing the 'future' is possible, but not because something has already happened, more like an increased intuition giving the ability to know somehow what will, or might happen given the course of events happening in the moment/present.