When you’re saving the data on your custom post type you need to set it so that the meta box value is actually stored as a UNIX timestamp, eg:
if(!isset($_POST["event_informations_date"])) {
return $post;
} else {
$event_as_timestamp = strtotime ( $_POST["event_informations_date"];
update_post_meta($post->ID, "event_informations_date", $event_as_timestamp );
}
This way you will have an orderable value for your meta keys. And you can query as per @helgatheviking
$args = array( 'post_type' => 'Event',
'posts_per_page' => 1000,
'order_by' => 'meta_value_num',
'meta_value' => 'event_informations_date' );
You will need to make sure that the add_meta_box()
function you’re using converts the UNIX timestamp from saved custom field values back to the format you need.
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