This theory attempts to reconcile the six days of creation activity (Gen. 1) with the billions of years required by evolutionary chronology. However, there is overwhelming evidence that the "days" in Genesis 1 are ordinary solar days.
Moses, who wrote the entire Pentateuch, viewed the creation days in the same sense as a sabbath day—obviously, a literal day (Ex. 20:11).
The days were equally divided into periods of light and darkness. Obviously, plants could not survive through "nights" (i.e., periods of darkness) that lasted billions of years.
Plants were created on the third day, while other living creatures were not made until the fifth and sixth days. Plants that depend on insect pollination could never have survived millions of years, waiting for insects to arrive.
Heavenly movements determine methods of measuring time (e.g., years, months, and days), but nothing explains the "week" except for the creation span of Genesis 1.
In Genesis, "day" (Heb. yom), when associated with a definite numeral, indicates a literal day (cf. 7:11; 8:14; 17:12).
It is a travesty to distort the Genesis record to conform to the Darwinian hypothesis.