When specifying past dates in the Executive Workload Summary Report, the following error is thrown:
"Executive Workload Summary Reports are limited to the most recent 90 days"
There is, however, a predefined time range of "Last Year"
The 90-day limitation is by design. The "Last Year" predefined item in the drop down menu should not be there and is a bug.
Waiting for fix in a future release of Performance Analysis for SQL Server.