The word repeated throughout the creation story as "day" is actually the Hebrew word Mwy, from a root word meaning to be hot; a day (as in the warm hours), whether literal (from sunrise to sunset, or from one sunset to the next), or figurative (a space of time). So it would seem that the time translated "day" could be either a literal "working day" or a figurative time span. A single day is like a thousand years with God and a thousand years are like a single day (2 Pet. 3:8).

But, consider this phrase found in Gen. 1:13:

yhyw	bre	yhyw	rqb	Mwy	ysyls
there was	evening, night, sunset	there was	morning, sunrise	day, time, year	three

This phrase is found in Genesis chapter 1 verses 5, 8, 13, 19, 23, and 31. It is repeated over and over at the end of every Mwy or day/time. This phrase would suggest to me that the time periods had a beginning and an end, a working day and a night.

Also consider that on the earth it is always day somewhere and always night somewhere else. Do you suppose that God made the plants where the Sun was lighting the earth and then when it got back around to the beginning He started on the next day? Actually, that's probably not possible because He made the plants before He made the Sun.

The land produced vegetation... - Gen. 1:12 (day 3)
God made two great lights – the greater light to rule over the day and the lesser light to rule over the night. He made the stars also. - Gen. 1:16 (day 4)

Before God made the Sun, God said, "Let there be light." And there was light! God saw that the light was good, so God separated the light from the darkness. God called the light "day" and the darkness "night." There was evening, and there was morning, marking the first day. Since God had not yet made the Sun (day 4), was it light for about half the time and dark for about half the time? Honestly, I cannot answer that question any more than you can. I wasn't there. And that is also why I cannot answer whether Genesis 1 is a literal account of events or a parable.

So why did you put this into the Truth category again? Simple. The Scriptures always have one interpretation: it says one thing. It doesn't say several things. Genesis 1 clearly states that in a time period (day or millennia) God did it.