Element datelist

datelist =>

array:16 [
  "class" => "Drupal\Core\Datetime\Element\Datelist"
  "provider" => "core"
  "id" => "datelist"
  "#input" => true
  "#element_validate" => array:1 [
    0 => array:2 [
      0 => "Drupal\Core\Datetime\Element\Datelist"
      1 => "validateDatelist"
    ]
  ]
  "#process" => array:1 [
    0 => array:2 [
      0 => "Drupal\Core\Datetime\Element\Datelist"
      1 => "processDatelist"
    ]
  ]
  "#theme" => "datetime_form"
  "#theme_wrappers" => array:1 [
    0 => "datetime_wrapper"
  ]
  "#date_part_order" => array:5 [
    0 => "year"
    1 => "month"
    2 => "day"
    3 => "hour"
    4 => "minute"
  ]
  "#date_year_range" => "1900:2050"
  "#date_increment" => 1
  "#date_date_callbacks" => []
  "#date_timezone" => "Europe/Zurich"
  "#value_callback" => array:2 [
    0 => "Drupal\Core\Datetime\Element\Datelist"
    1 => "valueCallback"
  ]
  "#type" => "datelist"
  "#defaults_loaded" => true
]