title: How to do Flex date deduction and addition
body: <p>In flex, I am trying to do date deduction and addition, but couldn't find a way to do it. </p>
  
  <p>e.g.: 
  public var dateNow:Date=new Date();</p>
  
  <p>How can I get the Date 3 months earlier than dateNow?</p>
  
  <p>Thanks!!!</p>