Date issue in Mail merge in MS CRM 2011

I have a date field DOB in a MS CRM FORM, the date format here is mm/dd/yyyy, I;e if I select 10- December-2013, the field will display it as 12/10/2013. Now when I go for the mail merge, the date and month part get swapped and the resultant date is displayed as 12-October-2013.

How can I resolve this issue ?