Steve Shaw.

Time did not start with the Big Bang. Just time that we can measure. Think of the singularity as a wiped, thoroughly formatted hard drive and our science as incapable of analyzing anything other than digital files. Obviously the hard drive existed in some form before we could see data on it. But we have no way of measuring the nature of that existence.

Where did the singularity come from? How long did it exist before it "Banged?" We cannot know.