function filter_opdrachten_op_datum($query) { if (!is_admin() && $query->is_main_query() && is_post_type_archive('opdrachten')) { $today = current_time('YmdHi'); // Formaat: JJJJMMDDUUmm $meta_query = [ 'relation' => 'AND', [ 'key' => 'zichtbaar_vanaf', 'value' => $today, 'compare' => '<=', 'type' => 'NUMERIC', ], [ 'key' => 'zichtbaar_tot', 'value' => $today, 'compare' => '>=', 'type' => 'NUMERIC', ], ]; $query->set('meta_query', $meta_query); } } add_action('pre_get_posts', 'filter_opdrachten_op_datum');