Sorry, I couldn't find pricing data for that day. The closing price for the S&P 500 (GSPC) on December 26, 1997 was $936.46. It was up 0.4% for the day. The latest price is $6,953.37.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
December 26 1997
$932.70
$939.99
$932.70
$936.46
154,900,000
Daily pricing data for the S&P 500 dates back to 12/30/1927, and may be incomplete.