Add time and date to WooCommerce order page with new column.

Date_time_on_WooCommerce_order_page.php

<?php

//https://woopress.hu/forumok/tema/rende/

function RENDELES_DATUMA_ES_IDO_OSZLOP( $columns ) {

  $new_columns = ( is_array( $columns ) ) ? $columns : array();
  	unset( $new_columns[ 'order_actions' ] );

  	$new_columns['RENDELES_DATUMA_ES_IDO'] = 'Rendelés dátuma';

  	$new_columns[ 'order_actions' ] = $columns[ 'order_actions' ];
  	return $new_columns;
}

function RENDELES_DATUMA_ES_IDO_TARTALOM( $column ) {
	global $post;

  $data = get_post_meta( $post->ID );

	if ( $column == 'RENDELES_DATUMA_ES_IDO' ) {

    $order = new WC_Order($post->ID);
    $order_date = $order->order_date;

		echo $order_date ;
	}

}

add_filter( 'manage_edit-shop_order_columns', 'RENDELES_DATUMA_ES_IDO_OSZLOP' );
add_action( 'manage_shop_order_posts_custom_column', 'RENDELES_DATUMA_ES_IDO_TARTALOM', 2 );