SSRS Mass Date format Change

With the New Year upon us,  I have been asked to make sure that all of our dates on Reports/Documents are changed to be in the following format MM/DD/YYYY.  We have SSRS reports that have different date formats that have been used for formatting reasons.  I now need to ensure all of the date formats are set to YYYY.  Is there a simpler way though a query or script to change all of our SSRS reports to have the date format to be MM/DD/YYYY?