Stephen Hawking in particular has addressed a connection between Time and the Big Bang. In ‘A Brief History of Time‘ and elsewhere, Hawking says that even if Time did not begin with the Big Bang and there were another time frame before the Big Bang, no information from events then would be accessible to us, and nothing that happened then would have any effect upon the present Time-frame.
Upon occasion, Hawking has stated that time actually began with the Big Bang, and that questions about what happened before the Big Bang are meaningless.
While the Big Bang model is well established in cosmology, it is likely to be refined in the future. Little is known about the earliest moments of the universe’s history. Proposals see the Big Bang as an event in a much larger and older universe, or multiverse, and not the literal beginning.