Sort by date, then by time

You can order by multiple things see more on https://make.wordpress.org/core/2014/08/29/a-more-powerful-order-by-in-wordpress-4-0/:

$args = array(
    'meta_key' => 'start_time',
    'orderby' => array('date' => 'ASC', 'meta_value' => 'ASC)
);

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