B.B.B. = Before Big Bang.
A.B.B. = After Big Bang.
When time travel becomes a very real thing we will be able to time travel all the way back to year 1 B.B.B. We will successfully be able to tell the time before the big bang simply by bringing an Earth watch with us back in time. The reason there is currently no time before the big bang is because earth and sun had not been created yet which means a nifty little time telling gadget called a watch had also not been created yet. If we could travel back in time to the point of the big bang and then travel backwards second by second with a watch keeping track we would see complete darkness (except for the background light of our watch) as we travel back in time. Year 1 B.B.B. would turn to Year 1 A.B.B. similarily to year 1 B.C.E (before common era) and year 1 A.D. (anno domini). If space is infinite then so must be time. 🙂 The lack of boundaries at the edge of the universe suggest that space is not limited to having walls. Unfortunately, this does not answer what the big bang was triggered by but something entered ground zero and it sparked a major reaction with the surrounding time-space which created the observable universe that we all know and love. I think that a countdown to the big bang is a wonderful idea that we should take into the future and past as we ride out the many waves of time-space and observable universe.