WooCommerce - Show full date in order list

<?php
// WooCommerce - Show full date in order list
add_filter( 'manage_shop_order_posts_columns', 'custom_shop_order_posts_columns', 99 );
function custom_shop_order_posts_columns( $columns ) {
  $new_columns = array();
  foreach( $columns as $key => $name ) {
    if( 'order_date' == $key ) {
      $new_columns['custom_order_date'] = 'Date';
    } else {
      $new_columns[$key] = $name;
    }
  }
  return $new_columns;
}

add_action( 'manage_shop_order_posts_custom_column' , 'show_custom_columns', 10, 2 );
function show_custom_columns( $column_name, $post_id ) {
  if( 'custom_order_date' == $column_name ) {
    $order = wc_get_order( $post_id );
    if( ! $order ) {
      return;
    }
    $order_timestamp = $order->get_date_created() ? $order->get_date_created()->getTimestamp() : '';
    if ( ! $order_timestamp ) {
      print '&ndash;';
      return;
    }
    print date( get_option( 'date_format' ).' '.get_option( 'time_format' ), $order_timestamp );
  }
}