function isDisabledDate(date) {
  // date is a JS Date object
  if (    (date.getFullYear() > 2012) 
      || (date.getFullYear() == 2012 && date.getMonth() > 1) //month is zero-based
      || (date.getFullYear() == 2012 && date.getMonth() == 1 && date.getDate() >= 5)) {
      return false; //allow today and further
  }      
  return true; // disallow past
};