Allow me to explain.

If I had a time machine for blogging, I would never blog in the present. I would always travel back in time to a few days earlier to write my entry. If I ever spent too much time in the near past, I would always travel back to that point a few days ago and continue to blog. I would live over the same three or four days for eternity (or until I die, whichever came first), blogging all the while. I would cease to exist in the present and exist only in the past, growing old over the course of three or four blog-filled days and never again seen by anyone who knew me.