gform_pre_submission hook not saving data

HI there,

I'm trying to use the gform_pre_submission hook to convert a date field into a different format.

I'm using the following:

add_action("gform_pre_submission", "pre_submission_handler", 10, 2);

function pre_submission_handler($form){
    date_default_timezone_set('UTC');
    $date = $_POST["input_4"];
    $date = date('l jS M', strtotime($date));
    $_POST["input_4"] = $date;
    die(var_dump($_POST));
}

When I perform a vardump of the $_POST variable it gives the right info:

["input_4"]=> string(17) "Saturday 29th Jun"

but it doesn't seem to save it. In the entries page the Date column is left blank.

Any thoughts?

Ahh ok cheers David - got it working!