Como añadir un selector de fecha en el checkout de WooCommerce

// Register main datepicker jQuery plugin script
add_action( 'wp_enqueue_scripts', 'enabling_date_picker' );
function enabling_date_picker() {

    // Only on front-end and checkout page
    if( is_admin() || ! is_checkout() ) return;

    // Load the datepicker jQuery-ui plugin script
    wp_enqueue_script( 'jquery-ui-datepicker' );
}

// Call datepicker functionality in your custom text field
add_action('woocommerce_after_order_notes', 'ncydesign_datepicker_field', 10, 1);
function ncydesign_datepicker_field( $checkout ) {

    date_default_timezone_set('Europe/Madrid');
    $mydateoptions = array('' => __('Seleccionar Fecha', 'woocommerce' ));

    echo '<div id="my_custom_checkout_field">
    <h3>'.__('Fecha de Entrega').'</h3>';

    // SCRIPT
    echo '
    <script>
        jQuery(function($){
            $("#datepicker").datepicker({ minDate: 0});
        });
    </script>';

   woocommerce_form_field( 'delivery_date', array(
        'type'          => 'text',
        'class'         => array('my-field-class form-row-wide'),
        'id'            => 'datepicker',
        'required'      => true,
        'label'         => __('Fecha de Entrega'),
        'placeholder'       => __('Seleccionar fecha'),
        'options'     =>   $mydateoptions
        ),
    $checkout->get_value( 'cylinder_collect_date' ));

    echo '</div>';
}
/**
 * Process the checkout
 **/
add_action('woocommerce_checkout_process', 'my_custom_checkout_field_process');

function my_custom_checkout_field_process() {
    global $woocommerce;

    // Check if set, if its not set add an error.
    if (!$_POST['delivery_date'])
         wc_add_notice( '<strong>Fecha de entrega</strong> ' . __( 'es un dato obligatorio.', 'woocommerce' ), 'error' );
}
 /**
 * Update the order meta with custom fields values
 * */
 add_action('woocommerce_checkout_update_order_meta', 'my_custom_checkout_field_update_order_meta');

 function my_custom_checkout_field_update_order_meta($order_id) {

if (!empty($_POST['delivery_date'])) {
    update_post_meta($order_id, 'Fecha de Entrega', sanitize_text_field($_POST['delivery_date']));
}
}

/* Save custom field */
 
add_action( 'woocommerce_checkout_update_order_meta', 'save_datepicker' );
  
function save_datepicker( $order_id ) { 
    if ( $_POST['delivery_date'] ) update_post_meta( $order_id, 'Fecha de Entrega', esc_attr( $_POST['delivery_date'] ) );
}
  
add_action( 'woocommerce_admin_order_data_after_billing_address', 'show_datepicker', 10, 1 );
   
function show_datepicker( $order ) {    
   $order_id = $order->get_id();
   if ( get_post_meta( $order_id, 'Fecha de Entrega', true ) ) echo '<p><strong>Fecha de Entrega:</strong> ' . get_post_meta( $order_id, 'Fecha de Entrega', true ) . '</p>';
}

/* Save custom field email */
add_action( 'woocommerce_email_after_order_table', 'show_datepicker_emails', 20, 4 );
  
function show_datepicker_emails( $order, $sent_to_admin, $plain_text, $email ) {
    if ( get_post_meta( $order->get_id(), 'Fecha de Entrega', true ) ) echo '<p><strong>Fecha de Entrega:</strong> ' . get_post_meta( $order->get_id(), 'Fecha de Entrega', true ) . '</p>';
}