title: How to specify Date object in jsdoc function parameter?
body: <pre><code>/**
   * 
   * @param {?} date 
   */
  function diffDays (date){
  
    var utcThis = Date.UTC(this.getFullYear(), this.getMonth(), this.getDate(), this.getHours(), this.getMinutes(), this.getSeconds(), this.getMilliseconds());
    var utcOther = Date.UTC(date.getFullYear(), date.getMonth(), date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds(), date.getMilliseconds());
  
    return (utcThis - utcOther) / 86400000;
  };
  </code></pre>
  <p>I couldn't find any documentation about built-in Date object in jsdoc docs. What is the recommended way of specifying the Date type in params list.</p>