"Use date" option in System tester problem

 
I am having a problem with the use of the "Use date" option in the System tester. When I run the system tester with "Use date" checked, I only get testing for 1 month of data. I tried changing the "Model" and the "Period" option but it still only tests 1 month of data. Does anyone know how to run system tester for a duration of 1 year or more worth of data?
 
I answered this in my topic "Time for real back tests"