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date

$meta_query = array(
	'relation' => 'AND',
	array(
		'key'     => 'termine',
		'value'   => '4',
	),
	array(
		'key'     => 'termine_4_datum',
		'value'   => 'date('Ymd',$date)',
		'compare' => '<=',
	),
);