In NY, "on or about" means 30 day extension

as long as you informed the other party of your intention before that "on or about" date. So if you are in NY, you would have until Jan. 29 for the closing. I am not sure which state your property locates and how your state law interprets it. You will have to check with your lawyer to be certain. If you suffer any liquidated damage as a result of Wells Fargo not ready to close, you probably has no cause of action against them.