Meta Between Dates

$meta_query = array(
	'relation' => 'AND',
	array(
		'key'     => 'wpcf-image-start-date',
		'value'   => 'time()',
		'compare' => '>',
		'type'    => 'UNSIGNED',
	),
	array(
		'key'     => 'wpcf-image-end-date',
		'value'   => 'time()',
		'compare' => '<',
		'type'    => 'DATE',
	),
);