Checking condition for last 15 days date using JavaScript in MS CRM

var currentDate = new Date();

var dateOfContact = crmForm.all.new_submissiondate.DataValue;

if(dateOfContact != null)

{

  var pastMaxDate = new Date();

  currentDate.setHours(0);

  currentDate.setMinutes(0);

  currentDate.setSeconds(0); 

  currentDate.setMilliseconds(0);

 

  pastMaxDate.setDate(currentDate.getDate()-14);

  pastMaxDate.setHours(0);

  pastMaxDate.setMinutes(0);

  pastMaxDate.setSeconds(0);

  pastMaxDate.setMilliseconds(0);

  //Checking condition for last 15 days

  if( !((dateOfContact <= currentDate) && (dateOfContact >= pastMaxDate)) )

  {

    crmForm.all.new_submissiondate.DataValue = null;

    alert("Valid date range is from "+ pastMaxDate.toLocaleDateString() + " to till today.");

  }

}