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zk_republish_block_to

$meta_query = array(
	'relation' => 'OR',
	array(
		'key'     => 'zk_republish_block_to',
		'compare' => 'NOT EXISTS',
	),
	array(
		'key'     => 'zk_republish_block_to',
		'value'   => '$date',
		'compare' => '<',
	),
);