2 field value's to the title

Hi,

You can create two fields text and time, assign to the CPT groepen.

Then use the filter the_title to show the field value as the title of CPT. Follow my sample code

add_filter( 'the_title', 'change_post_title_by_field_value', 99, 2 );

function change_post_title_by_field_value( $title, $post_id ) {
    if( get_post_type( $post_id ) == 'groepen' ) {
        $title = rwmb_meta( 'text' ) . ' - ' . rwmb_meta( 'time' );
    }

    return $title;
}

see my screen record https://www.loom.com/share/1ecaa40b23d749f7b8315c1362bd602c
and this documentation https://developer.wordpress.org/reference/hooks/the_title/