Sorry, I couldn't find pricing data for that day. The closing price for the Dow Jones Industrial Average (DJI) on December 31, 1979 was $838.74. The latest price is $46,183.20.
DATE
OPEN
HIGH
LOW
CLOSE
December 31 1979
$838.91
$843.17
$834.39
$838.74
Daily pricing data for the Dow Jones Industrial Average dates back to 1/2/1950, and may be incomplete.