The book of Genesis refers to the creation week as having intervals that describes what a day is in relation to time. The intervals are broken up into evening, morning, number and day. So the paradigm in Genesis 1 limits the length of a day to being a 24 hr period for each day of the creation week, which is self-explanatory.
God is as a thousand years and a thousand years is as a day is a reference from scripture that God is outside of time, and not that day could mean a thousand years on earth, unless it's in respect to a person. For example: "In the day of my forefathers" is a reference to a period of time relative to a persons life span and not in reference to the creation week, which is specifically describing the days of the first week as being officially 24 hr periods, which is self-evident.
Genesis 1:8
8 And God called the firmament Heaven. And the evening and the morning were the second day.
God is as a thousand years and a thousand years is as a day is a reference from scripture that God is outside of time, and not that day could mean a thousand years on earth, unless it's in respect to a person. For example: "In the day of my forefathers" is a reference to a period of time relative to a persons life span and not in reference to the creation week, which is specifically describing the days of the first week as being officially 24 hr periods, which is self-evident.
Genesis 1:8
8 And God called the firmament Heaven. And the evening and the morning were the second day.