title: How to subtract one month from each month in a Date.UTC Array with jQuery
body: <p>i´m using the highchart plungin for my new project i have just notice that in my data array, the date must have one month less because in javascript the month´s starts in 00 (not in 01). My array with the values are something like this  (:</p>
  
  <pre><code>var usdeur = [
      [Date.UTC(2004, 3, 31), 0],
      [Date.UTC(2004, 4, 1), 0.134879956838416],
      [Date.UTC(2004, 4, 2), 0.471580293538753],
      [Date.UTC(2004, 4, 3), 0.473578515121543],
      [Date.UTC(2004, 4, 4), 0.474577625912938],
  ];
  </code></pre>
  
  <p>Any idea of how can i subtract one month for each date to make the chart work fine?</p>
  
  <p>Thank you and sorry for my terrible english.</p>