date_query

$date_query = array(
	'relation' => 'AND',
	array(
		'year'          => 1999,
		'compare'       => '>',
		'column'        => 'post_date',
	),
	array(
		'year'          => 2000,
		'month'         => 12,
		'day'           => 30,
		'compare'       => '<',
		'column'        => 'post_date',
	),
);