“God called the light day, and the darkness He called night. And there was evening and there was morning, one day.” (Genesis 1:5)
Again, God speaks. This time the word used has the meaning of call as in to proclaim. By naming the light and the darkness, God further separates them. In the same act He gives meaning to the light and darkness.
Next we find the controversial part of this verse that some argue is not strictly one day. There are several reasons we can refute this view point. First, the word for day is clarified by evening and morning, which is a single day. Second, Genesis 2:2 says “by the seventh day”, telling us of seven days that comprised the completion of creation. Third, throughout the Bible the days of creation are treated only as twenty-four hour periods. Lastly, what would you say to God if He asked you to justify your view of the time period of creation? We can choose to trust God’s word or deny it (Psalm 119:42 or Romans 1:21).