system_form_user_form_alter

system_form_user_form_alter(&$form, FormStateInterface $form_state)

function system_form_user_form_alter(&$form, FormStateInterface $form_state) {
  if (\Drupal::config('system.date')->get('timezone.user.configurable')) {
    system_user_timezone($form, $form_state);
  }
}