The Big Bang is the theory about how the physical universe began. It is assumed that in the beginning, all matter in the universe was compacted to a very dense point in spacetime known as a singularity. When the extreme mass of intense gravitational pressure could no longer contain itself, it exploded and released itself in all directions, thus causing what we define as the Big Bang. Scientist do not know where did the singularity come from, but the truth about the Big Bang is different from what they think.
Forget about the clock. Forget about the calender. Forget about the time you think you have to do what ever you think you need to do because it does not represent anything tangible, or intangible for that matter, in the actual reality of your existence. Time is a theory. Time is an illusion. Time is a phantom you chase all your life and never manage to catch.