DtZTWT

$meta_query = array(
	'relation' => 'AND',
	array(
		'relation' => 'AND',
		array(
			'key'     => 'teststart',
			'value'   => 'date('Ymd')',
			'compare' => '<=',
			'type'    => 'DATE',
		),
		array(
			'key'     => 'testende',
			'value'   => 'date('Ymd')',
			'compare' => '>=',
			'type'    => 'DATE',
		),
	),
	array(
		'relation' => 'AND',
		array(
			'key'     => 'teststartzeit',
			'value'   => '$current_time',
			'compare' => '<=',
		),
		array(
			'key'     => 'testendzeit',
			'value'   => '$current_time',
			'compare' => '>=',
		),
	),
	array(
	),
);