diff -Naur a/boost/date_time/date_formatting.hpp b/boost/date_time/date_formatting.hpp
--- a/boost/date_time/date_formatting.hpp	2012-07-05 16:47:25.000000000 +0530
+++ b/boost/date_time/date_formatting.hpp	2012-07-10 18:17:16.000000000 +0530
@@ -54,6 +54,9 @@
           os << std::setw(2) << std::setfill(os.widen('0')) << month.as_number();
           break;
         }
+	
+	default:
+	break;
      
       }
       return os;