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  • Hi John

    I gave up in the end I used the following but it returns only a -1 in my number field. I’ll have to try again another time thanks for your help though.

    `add_action(‘acf/save_post’, ‘calc_time’, 1);
    function calc_time($post_id) {
    $start = get_field(‘consultation_start_time’, $post_id);
    $end = get_field(‘consultation_end_time’, $post_id);
    // calculate difference
    // see

    $calculated_time = ($end.” -“.$start);

    update_field(‘total_duration’, $calculated_time, $post_id);