You can think of time as a horizontal line. A is followed by B, B is followed by C, C is followed by D, and so on and so forth: it is a linear progression. Existence is not horizontal, existence is vertical. Existence does not move in a line -- from A to B, from B to C -- existence moves in intensity: from A to a deeper A, from the deeper A to an even deeper A. It is diving into the moment.
Time conceived of as past and future is the language of the mind -- and the mind can only create problems, it knows no solutions. All the problems that humanity is burdened with are the mind's inventions. Existence is a mystery, not a problem. It has not to be solved, it has to be lived.