REFILE-Nikkei sees biggest daily gain in 6-1/2 weeks on Wall St, Fed confidence

(Corrects to remove superfluous Reuters Instrument Code from 3rd paragraph) TOKYO, Dec 18(Reuters) - Japanese stocks enjoyed their best day in 6-1/2 weeks on Thursday after the U.S. Federal Reserve expressed confidence in the U.S. economy and promised a "patient" approach to raising interest rates, boosting Wall Street shares. The Nikkei benchmark climbed 2.3 percent to 17,210.05, its biggest daily jump since Nov. 4. Exporters Toyota Motor Co and Canon Inc climbed 1.5 percent and 1.