Untitled Snippet

// WP_Query arguments
$args = array(
	'post_type'              => array( 'shop_order' ),
	'post_status'            => array( 'wc-completed' ),
	'date_query'             => array(
		array(
			'before' => array(
				'year'  => 2018,
				'month' => 1,
				'day'   => 13,
			),
		),
	),
);

// The Query
$query = new WP_Query( $args );