Home Forums General Issues Calculating time in ACF Reply To: Calculating time in ACF

  • To do this in PHP you would create an acf/save_post filter, get the two fields, calculate the difference and then update the 3rd field.

    add_action('acf/save_post', 'calc_time', 20);
    function calc_time($post_id) {
      $start = get_field('start_time', $post_id);
      $end = get_field('end_time', $post_id);
      // calculate difference 
      // see
      update_field('total_time', $calculated_time, $post_id);

    Doing this with JS would be much more difficult and I would not be able to provide any code without spending a lot of time doing so because there are no examples that I know of. YOu would need to add custom JS and add onChange actions to the date fields. The you would need to use the ACF JS API to get the values of the fields, then you’d need to calulate this difference using JS and finally use the ACF API to set the value of the 3rd field.

    Sorry I can’t help you more with the code, but like I said, I don’t have any examples and building them would require quite an effort.