June Orders

// WP_Query arguments
$args = array(
	'post_type'              => array( 'order' ),
	'post_status'            => array( 'wc-completed' ),
	'date_query'             => array(
		'relation' => 'AND',
		array(
			'before'        => 'last day of june 23:59:59',
			'after'         => 'first day of june 00:00:00',
			'inclusive'     => true,
		),
	),
);

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