Wrong attandance date

I have filled up DS 160 and taken appointment too. I made one big mistake that I provided wrong attandance date of my PG for example: start date is Jul 71998 and end date Jul 10 2001 instead of Oct 7 1998 and Aug 10 2000. M.SC is two years course.actually I did write exam for one subject in 2000 hence written in 2001.

Will it create a problem for interview?

Not really. But worst case you never know. in such case if any one points about that, simply say that probably by that time it was some typo and really sorry about that. Try to provide original documents to them as evidence.