title: Convert year, month and day to single date in jQuery
body: <p>The ruby method</p>
  
  <p>DateTime.new(@year, @month, @day)</p>
  
  <p>uses three integers <code>@year</code> <code>@month</code> and <code>@day</code> to create a single datetime.</p>
  
  <p>Is there a jQuery method that accomplishes this?</p>