test 3

$meta_query_2 = array(
	'relation' => 'OR',
	array(
		'key'     => 'ends_at_date_period_1',
		'compare' => '<=',
		'type'    => 'DATETIME',
	),
	array(
		'key'     => 'ends_at_date_period_2',
		'value'   => 'asf',
		'compare' => '<=',
		'type'    => 'DATETIME',
	),
);