dateField.openConfigPanel();
String dateFormat = "yyyy.MM.dd";
dateField.setDateFormat(dateFormat);
// Close the configuration panel to refresh the date field preview.
dateField.closeConfigPanel();
// Select a date using the date picker.
DatePicker datePicker = dateField.openDatePicker();
// The current date format doesn't include time information.
Assert.assertFalse(datePicker.hasHourSelector());