There are God's days and there are our days. There are also the days of Daniel that differ from ours.
The creation was His so could the time there be reckoned by His time? The years of Adam belonged to him so could it be reckoned by human time? Just something to think about but it certainly can be the answer to some puzzling questions.
Not to mention it cannot possibly refer to earth days since the earth sun wasn’t created til day three.