Mera Query Event Start Date

$meta_query = array(
	'relation' => 'AND',
	array(
		'key'     => 'start_date',
		'value'   => 'now',
		'compare' => '>=',
		'type'    => 'DATE',
	),
	array(
		'key'     => 'start_time',
		'compare' => 'EXISTS',
		'type'    => 'TIME',
	),
);