Six days of creation can also refer to periods of time

The term used in Genesis referring to six days of creation is “yom”, which can mean a portion of a day, a full day, an era, or a finite period of time. Dr. Hugh Ross makes the case can also be made that the days are six consecutive long “periods of time”. Some interesting arguments here, which need not be cause for division.
http://youtu.be/vhrg9qHq3DQ