1 Thus the heavens and the earth were finished, and all the host of them.
2 And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made.
3 And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made.
This is actually a continuation of chapter 1. It deals with the seventh day of the creation week. The word rest is shabath which is same word use in Exodus 20:8, making a clear connection to the Sabbath day.
Day seven is the day God ended his work of creating the universe and all it contains. The clear intent is to indicate that God created the entire universe in one ordinarily week.