code: public void setDateWithDefaultZone(java.util.Date javaUtilDate) {
          if (javaUtilDate == null) {
              parentDatePicker.setDate(null);
              return;
          }
          Instant instant = Instant.ofEpochMilli(javaUtilDate.getTime());
          ZonedDateTime zonedDateTime = instant.atZone(ZoneId.systemDefault());
          LocalDate localDate = zonedDateTime.toLocalDate();
          parentDatePicker.setDate(localDate);
      }
docs: setDateWithDefaultZone, Sets the date picker value from a java.util.Date using the system
  default time zone. If either the date or the time zone are null, the date picker will be
  cleared.