Sorry, I couldn't find pricing data for that day. The closing price for the S&P 500 (GSPC) on June 28, 2013 was $1,606.28. It was down 0.3% for the day. The latest price is $5,624.91.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
June 28 2013
$1,611.12
$1,615.94
$1,601.06
$1,606.28
4,977,190,000
Daily pricing data for the S&P 500 dates back to 12/30/1927, and may be incomplete.