Right now is all there is (and even that's a bit iffy)...
The past is frozen:
Moves on; nor all your Piety nor Wit
Shall lure it back to cancel half a Line,
Nor all your Tears wash out a Word of it.
The future ain't here, never will be:
We treat our future selves as though they were our children, spending most of the hours of most of our days constructing tomorrows that we hope will make them happy.