private DateTimeField convertField(DateTimeField field, HashMap<Object, Object> converted) {
   if (field == null || !field.isSupported()) {
     return field;
   }
   if (converted.containsKey(field)) {
     return (DateTimeField) converted.get(field);
   }
   ZonedDateTimeField zonedField =
       new ZonedDateTimeField(
           field,
           getZone(),
           convertField(field.getDurationField(), converted),
           convertField(field.getRangeDurationField(), converted),
           convertField(field.getLeapDurationField(), converted));
   converted.put(field, zonedField);
   return zonedField;
 }