http://www.henryong.com
Pretty sure there is not an easy way to do this. You may be able to get some ideas in the below blog about using a workflow to capture the current date.
http://cicoria.com/cs1/blogs/cedarlogic/archive/2010/11/14/extending-sql-2008-r2-master-data-services-mds-with-iworkflowtypeextender.aspx