title: jQuery: Add 4 weeks to date in format dd-mm-yyyy
body: <p>I have a string which has a date in the format: dd-mm-yyyy</p>
  
  <p>How I can add 4 weeks to the string and then generate a new string using jQuery / Javascript?</p>
  
  <p>I have </p>
  
  <pre><code>var d = new Date(current_date); 
  d.setMonth(d.getMonth() + 1); 
  current_date_new = (d.getMonth() + 1 ) + '-' + d.getDate() + '-' + d.getFullYear();    
  alert(current_date_new); 
  </code></pre>
  
  <p>but it complains that the string provided is in the incorrect format</p>