Hi, it looks like the select input does not consider the showClear option. How do you clear a datetime input?
 DateTimePicker::create(array(
                    "name"=>"endDate",
                    "minDate"=>"@startDate",
                    "format"=>"DD.MM.YYYY",
                    "themeBase"=>"bs4",
                    "locale"=>"de",
                    'options'=>[
                        'useCurrent'=>false,
                        'showClear'=>true
                    ],
                ));
Clearing the input also doesn't work.
