The Balanced Budget Act of 1997, enacted August 5, 1997, required the per-beneficiary limitations be established by April 1, 1998.
It was late summer when the Balanced Budget Act was enacted. 
mnli hypothesis: It was late summer when the Balanced Budget Act was enacted.  premise: The Balanced Budget Act of 1997, enacted August 5, 1997, required the per-beneficiary limitations be established by April 1, 1998.