Select Weekdays in the date field/Variable Servicenow

Script Include :
 var WeekDay = Class.create();
WeekDay.prototype = Object.extendsObject(AbstractAjaxProcessor, {
    WorkDay: function() {
  var selected_date = this.getParameter("sysparm_date");
  var d = new GlideDateTime(selected_date);
  var dayCount = d.getDayOfWeekLocalTime();
 //	gs.info("date count - "  + dayCount);
  if(dayCount == 5 || dayCount == 6){  // 5 - sat & 6 - sun
   return true;
  } else {
   return false;
  }
 },
    type: 'WeekDay'
});
  onChange Client Script :
 function onChange(control, oldValue, newValue, isLoading, isTemplate) {
    if (isLoading || newValue === '') {
        return;
    }
     var day = g_form.getValue('v_start_date');
    var ga = new GlideAjax("WeekDay");
    ga.addParam("sysparm_name", "WorkDay");
    ga.addParam("sysparm_date", day);
    ga.getXML(Day);
     function Day(response) {
        var answer = response.responseXML.documentElement.getAttribute("answer");
        if (answer == 'true') {
            alert('Please select Week Days from Monday-Friday');
            g_form.clearValue('v_start_date', true);
        }
    }
}