Here is a wiki article of a timeline of the Big Bang.
en.wikipedia.org/wiki/Graphical_timeline_of_the_Big_Bang
It is interesting to note that the “Photon Epoch” includes the time from one hour to a thousand years. The First Day, God said, “let there be light,” and behold! Light!
Now, the physicists’ view of the world carries certain assumptions, one of which is a constancy of physical laws, even though it includes a projection back in time to a time when our current physical laws were as yet undifferentiated. I will state simply that, “'tain’t necessarily so.” The physicists’ view in general does not include a Creator.
There are two possibilities regarding the laws of physics. Either, they are set by God as they are in order to form the universe as it is, or, they follow logically from first principles. If the former, then God can change them, if the latter, then He can’t for the same reason He can’t cease to be omnipotent, i.e. different physical laws would be a logical contradiction. The latter appeals to me for the same reason the immutability of the laws of physics appeals to scientists. In the very first beginnings of all things, literature and mathematics are One. “Perfect logic comes from perfect Love.” Either God chose the laws we see from among logical alternates, or, perfect logic produces the laws we see, without any alternatives.
Either way, the laws are what they are, and scientists cannot assume any Creator to change them at any point in Natural History. So scientists have no other alternative but to extrapolate from observable principles, backwards in time, to a “Big Bang.”
The moment of the Big Bang is the theological equivalent of God’s pronouncement, “Let there be light.” After that, evening came and morning followed, the First Day. All of what cosmologists present us in these timelines of the Big Bang, it would appear, took place that First Day, or possibly within the First and Second Days. Thus the First Day, in particular, has to include several billion years. To cram that much real time into a single day is absurd from a perspective that does not treat time as complex, but perfectly sensible if we allow time to have an imaginary component.
Do not think of “imaginary” as fictitious. The imaginary numbers are not in any sense fictitious. They are, rather, concepts that have usefulness and application in the physical world.
The moment of the Big Bang is a hard scientific boundary. It is impossible to project back to a “time” before the Big Bang.
But the fundamental error of atheistic cosmologists is to assume that because there was no physical time before the Big Bang, consequently, there was Nothing.
There was not “Nothing.” There was no physical universe, no time and space, but there was never “Nothing,” since, if there ever was really Nothing, there would still be Nothing now, and we can see that that isn’t the case.
Time is a dimension like the dimensions of space. As such, it can be mapped to a system of Cartesian co-ordinates. The Cartesian co-ordinate system is familiar to anyone who has taken high-school algebra. It involves, quite simply, a point called the Origin that is common to all axes, and lines called axes that extend infinitely out from the Origin. Conceptually, then, the Real Number Line begins at 0 and extends to infinity in both the positive and negative direction. An eternal universe would have Time extending infinitely from the present, NOW, as 0, to an infinite future and an infinite past. But we (used to) run into a conceptual difficulty with regard to the Big Bang and the Creation of Time. If NOW is the Origin, how can we also treat the Big Bang as t=0?
I submit, the solution of this dilemma is presented in this Asymptotic Theory of Time. Thus, this is a means of uniting, in a non-contradictory fashion, the sciences of Theology, Mathematics, and Physics.