I fail to see how Genesis is corrupted, given that there are NO dates. The “corruption” is a figment of your imagination.
..Perhaps we could postpone it for later ?
You're technically correct, as there are no dates given per se, but by tracking the genealogy of the sons of Adam through Seth to the point where we do have a reliable date, you can postulate the actual date of man's creation. This is the same method that the Jews use to determine their calendar year.
I would also point out that the 6,000 years is from the creation of man, not necessarily from the creation of the world. There's evidence, as others have pointed out, that there's an undetermined gap of time between Gen. 1:1 and 1:2. We don't know that there actually was a gap there, but we don't know that there wasn't either.
Finally, while I enjoy a YEC/OEC/Evolution debate from time to time and I understand how important the "1 day : 1k years" principle is to portions of the Dispensational theory, we're really getting off track here.