(Genesis 1:1) In the beginning God created the heaven and the earth.
(Genesis 1:2) And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters.
(Genesis 1:3) And God said, Let there be light: and there was light.
(Genesis 1:4) And God saw the light, that it was good: and God divided the light from the darkness.
(Genesis 1:5) And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
My comments on Genesis 1: 1-5 shall start with verse five. As we read chapter one, God is describing the things that He created on each day.
In Geneses 1:5 God calls this the first day. Let us look at a couple of things here. First, Moses is the author of this book as agreed, concluding that God would be talking to Moses on terms that he would understand. Thus, one day is one day according to Moses. Second, considering God is describing his creation on each day as noted in Chapter one. For each day we must ask, “What did God describe on day one that he has created?”
In Genesis 1:3 & 4 God describes the creation of light. In verse 4 it is specified that the light is called day and the darkness is called night. This is obvious, but what did God create on day one? Did he only create light?
In Genesis 1:1 & 2 God describes in the beginning he created the Heaven and the Earth and that the earth was without form, and void. In the beginning, what is the beginning? With God there is no beginning. There is no time. But for Moses, God says in the beginning, so the beginning of time is then on day one. Therefore, God is describing the things that He created on day one in the beginning of time. So God created the Heaven and the Earth and also light on day one.