After accounting for seasonal factors, the index registered 52.8.
Had it not been for the volatile food and energy categories, the index would have registered a decline of one-tenth of 1 percent.
It is also more efficient to set the index registers to 16 bits before pushing them.
Economists had predicted that the index would register 15.6 this month.
In January 1993 the index registered 23.
It was the highest close since July 2, 1984, when the index registered 265.20.
In February, the index registered 97.0, up strongly from January.
The index, which excludes volatile food and energy prices, registered an increase of just 0.1 percent in July, the smallest this year.
The index registered its previous high at the end of Saturday's half-day session, when it closed at 27,906.48 points.
But it was the lowest figure since April 1987, when the index registered 54.7 percent.