In Genesis 1:1 it says in the beginning God created the heavens and the Earth and we know that the heavens is the universe and then if you go to Genesis 2:1 it says the heavens or the universe and the Earth were finished and all the hosts of them, and then we go into verse 2 that says the seventh day God ended his work so we're looking at six or seven days for God to create and finish His work which would be the creation of the heavens and the Earth, and you can go on into verse 3 as well regarding the seventh day and then in verse 4 it says this is the history of the heavens and of the earth when they were created mentioning also once again the creation of the earth and the heavens actually mentioned twice in verse 4.