How to make this pre_get_posts function order my archives by custom field value

by Pete   Last Updated February 13, 2018 14:08 PM

I'm trying to get my archives to orderby posts by their custom field value e.g. 2018-06-23 10:00

//order archive posts by date
function order_archive_asc($query) {
  if ($query->is_archive() && $query->is_main_query() ) {
    $query->set('order', 'DESC');
    $query->set('post_status', 'future,publish');   
    $query->set('meta_key', 'date_time');       
    $query->set('orderby', 'meta_value_num');

add_action('pre_get_posts', 'order_archive_asc');

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