I don't know how you can alter the Report date. Mine shows today's date, but I cannot see how to alter that date.
However, I never use that analysis window. I a) use the Investing Portfolio view, and customize that view to show the various ROI periods etc. I am interested in, b) Use Investment Adviser names for the Investing Goals, and attach each Security to the Investing Adviser Goal who recommended that I purchase that security, c) create Investment Performance Reports by Investing Goal. This then tells me who is giving me the best advice based on various investment periods. I also use a dummy index which is the factored value of my portfolio divided by the All Ords/1000. I update my share prices and that dummy index at the end of each month, and those series of Reports gives me a good guide as how I am performing. In all this.
Hope this helps
Dan Fardon