Besides, the whole argument for the earth being billions of years old is the fact that since the fast acceleration caused by the "Big Bang", the earth was travelling at a much greater velocity out from the beginning point. So, billions of years could have passed on the earth in what would be considered "days" at the time of the Genesis revelation.
but taht doesnt make sense. hours, days, years, etc are units of measurement used by man. so if billions of years somehow equaled 6 24 hour periods, then just say 6 days, bc to men a 24 hr period is a day. The universe has an absolute age, there is a point when God created, it cant be billions of years old, and a few thousand years old.