Merge pull request #336 from actorius/patch-1

Adding support mixed date and string column data

sorting/datetime-moment.js

@@ -65,8 +65,8 @@ $.fn.dataTable.moment = function ( format, locale ) {
 			d = $.trim( d );
 		}
 		
-		return d === '' || d === null ?
+		return !moment(d, format, locale, true).isValid() ?
-			-Infinity :
+			Infinity :
 			parseInt( moment( d, format, locale, true ).format( 'x' ), 10 );
 	};
 };