The WTS and others say the 6 days of creation in Genesis are symbolic of longer time periods, while many others insist that a proper (and uncompromising) exegis reveals literal days. I have a hunch that the author literally meant what he wrote. The JW counter-argument to this is that Genesis was written by Moses and Moses wrote Psalm 90, which reads in part (v4):
For a thousand years in your sight
are like a day that has just gone by,
or like a watch in the night.
Therefore, time passage in God's sight is not necessarily equivalent to time in ours...
I dunno, pointing to a song lyric in order to substantiate a certain theory about the creation of the universe is a bit of a stretch, I think.