protected static Datetime::getHtml5DateFormat($element)

public static Datelist::valueCallback(&$element, $input, FormStateInterface

Provides a base class for date elements. Hierarchy class \Drupal\Component\Plugin\PluginBase

public static Datelist::processDatelist(&$element, FormStateInterface

public static Datetime::formatExample($format)

public Datetime::getInfo() Returns

public static Datetime::validateDatetime(&$element, FormStateInterface

Provides a datetime element. Plugin annotation @FormElement("datetime")