title: Date manipulations in Javascript
body: <p>I am using a dropdownlist and a calendar control in my page. In that I am having following list items.
  1)Last Week
  2)last month</p>
  
  <p>If I choose last week in the dropdownlist the calendar control should display the date range from date 7 days ago and today's date. 
  How can I get it through Java Script</p>