Chris,
I substituted this line in your code with this and it worked.
--AND a.DateABS BETWEEN ISNULL(x.StartDate,'19000101') AND t.EndDate
AND a.DateABS BETWEEN ISNULL(@FirstDay,'19000101') AND t.EndDate
@FirstDay was set to '2012-08-14'
This got me the desired results for the test data I supplied. Now I need to test against Prod data.
Thanks again!!
Sqlraider