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Start Date / End Date - calculate # of days - HOW?

  1. studio57designs

    I have a rental form in Cart66 that has a start date and an end date. Is it possible to enter both start and end date and then calculate the # of days?

    For example, the customer enters the start date of 5/1/2012 and end date of 5/6/2012 and the daily rate is $6.00 - we'd like to see the form pass the amount as $30 (5 days x $6) to the cart.

    Is there a way to create a function to do that or is it already built in and I've just not found it?



    Posted 12 years ago on Saturday April 28, 2012 | Permalink
  2. studio57designs

    Is this even possible? Anyone?


    Posted 12 years ago on Monday April 30, 2012 | Permalink
  3. David Peralty

    I just wanted to let you know that I've asked one of the developers to take a look at this post to see if they can give you any guidance. We aren't ignoring you. :)

    Posted 12 years ago on Monday April 30, 2012 | Permalink
  4. studio57designs

    Ok, thanks so much! I'll wait to hear from your guys.


    Posted 12 years ago on Monday April 30, 2012 | Permalink
  5. Hello Louise,
    I am not familiar with the details on how Cart66 integrates with Gravity Forms, so I can't give you a complete code snippet. However, you can use one of our hooks to calculate the number of days between two dates, come up with a total price based on a daily rate and finally store that result into another Gravity Forms field. Hopefully this will help you achieve your goal. If you still aren't able to make this work, I would suggest reaching out to the Cart66 folks. as they are the ones who built the integration with Gravity Forms and should be more familiar with it.

    add_action("gform_pre_submission", "pre_submission_handler");
    function pre_submission_handler($form){
        $start_date = $_POST["input_2"]; //NOTE: replace 2 with your actual start date input ID
        $end_date = $_POST["input_3"];  //NOTE: replace 3 with your actual end date input ID
        $days = gf_date_diff($start_date, $end_date);
        $daily_rate = 6.00;
        $_POST["input_4"] = floatval($daily_rate) * floatval($days); //NOTE: replace 4 with your actual total field ID (field that will be passed to Cart66)
    function gf_date_diff($start, $end) {
        $start_ts = strtotime($start);
        $end_ts = strtotime($end);
        $diff = $end_ts - $start_ts;
        return round($diff / 86400);


    Posted 12 years ago on Monday April 30, 2012 | Permalink
  6. studio57designs

    Thank you Alex. I gave it a try, but did not work for me. It was passing a value of 1 instead of the actual # of days.

    I'll check with Cart66....but, I really appreciate the response. Gives me some place to start.


    Posted 12 years ago on Tuesday May 1, 2012 | Permalink