date

$last_delivery = array(
	'relation' => 'AND',
	array(
		'key'     => 'delivery-date',
		'value'   => 'max',
		'compare' => '<=',
		'type'    => 'NUMERIC',
	),
	array(
		'key'     => 'delivery-date',
		'value'   => 'min',
		'compare' => '>=',
		'type'    => 'NUMERIC',
	),
);