I'm not nearly so knowledgable in this area as arachnophilia, but I thought I'd give my two cents.
Everything was completed in one day including all the things in Genesis 2:4-Genesis 4:26
If Genesis 1:1 is a complete action that happens
before anything else, then no, it wasn't made in one day, because day doesn't exist until 1:3.
He just has to remake some things that got messed up between Genesis 1:1 and Genesis 1:2.
Where in the Bible does it say that anything got "messed up" between Genesis 1:1 and 1:2?
Look, if you read Genesis as you do, it plainly contradicts itself. In Genesis 1:1 God creates the heavens and the earth. In Genesis 1:6 God creates a firmament and in 1:8 calls the firmament heaven. God creates heaven twice!