Form validation: Callback not changing the input value

[eluser]TheFuzzy0ne[/eluser]
How about this:

Code:

function date_check ()
{
    $day = $this->input->post('day');
    $month = $this->input->post('month');
    $year = $this->input->post('year');

    if (checkdate($month, $day, $year))
    {
        return TRUE;
    }

    $this->form_validation->set_message('date_check', 'The date field is invalid');

    return FALSE;
}

It should work in the same way.

NB: Just an observation - I noticed that the month is passed to checkdate() as the first parameter, and I expected it to pass the day in as the first parameter, is that right?