RSFORM Calandar choose date future only

Step1: calendar field-> atributes->min date set: 01/01/2012
Step2 : Components > RSForm!Pro > Manage forms > select your form > Properties > PHP Scripts
add code:
$futureDate = date('m/d/Y', strtotime("+2 days"));  
$formLayout = str_replace("{'mindate': '01/01/2012'}", "{'mindate': '".$futureDate."'}", $formLayout);

Explain: this code will be replace time 01/01/2012 with new date setting
This code from: http://www.rsjoomla.com/support/documentation/view-article/706-how-can-i-prevent-the-user-from-selecting-a-date-in-the-calendar-field.html