title: Null date type returns 1970 date value in angular2
body: <p>Getting the data from service and subscribed the data set with interface type in angular2 (typescript).</p>
  
  <p>Interface has date (startDate field name : Date type) field 
  From the service if the startDate field values comes null in html page format getting the 01/01/1970 value.</p>
  
  <pre><code>interface :
      export class name { 
       public realStartDate?: Date
  }
  
  
  subscribe : 
  this.data = data.map(item =&gt; new name (new Date(item.startDate))
  </code></pre>