Sorry, I couldn't find pricing data for that day. The closing price for the Dow Jones Industrial Average (DJI) on January 18, 1985 was $1,227.36. It was down 0.1% for the day.
Service Corporation International (SCI) had the highest return between November 27, 2000 and January 31, 2001 by a large-cap US stock, returning 105.3%.