Fetching Date of 25 Days Ago to Current Date using Javascript

<script type="text/javascript">
function getdates() 
{
  var today = new Date()
  var priorDate = new Date();
  priorDate.setDate(priorDate.getDate() - 25) //you can take any value
  document.getElementById('lblCurrentDate').innerHTML = today;
  document.getElementById('lblPreviousDate').innerHTML = priorDate;
}
</script>