@@ -998,14 +998,9 @@ public static class RubyTimeOps {
                         break;
 
                     default:
-                        if (context.RubyOptions.Compatibility >= RubyCompatibility.Ruby19) {
-                            result.Append('%');
-                        } 
-                        if (context.RubyOptions.Compatibility > RubyCompatibility.Ruby186) {
-                            result.Append(character);
-                            break;
-                        } 
-                        return MutableString.CreateEmpty();
+                        result.Append('%');
+                        result.Append(character);
+                        break;
                 }
 
                 if (dateTimeFormat != null) {