In 4.2, you can create a Date Filter, hidden from the user, that uses the 'Today' value. This is done within the Information Map.
In the prior versions, you can generate an expression in a hidden information map filter that uses the SAS Function today().
Note: The hidden filter is then forced on all uses of the Information Map. If it is available for viewing by users, WRS authors can choose whether to use the 'Today' filter or not.
Angela Hall
http://sas-bi.blogspot.com