u should probably start a new thread for this question since it's totally unrelated to your first question...
however...
you should include a few more details about this report...
i.e. when u say run report for today, do you mean report to be run with source data from a query based on today's date?
if that's the case, then you can just build a form and on it, have a text box for the date, and a command button to activate the report.
And in your query, use Forms![formName].tbxDate instead of the parameter...
this way, u can have default day set to today, checking date entered is valid...