title: How do I set the `startAt` date when using Angular Material Calendar?
body: <p>I'm using material2 v2.0.0-beta.10 as well as Angular v4 and having issues when using <code>md-calendar</code> component. My problem is that I'm unable to set the <code>startAt</code> date to anything.</p>
  
  <p>I set start date to yesterday as follows:</p>
  
  <pre><code>  this.startAt = new Date();
    this.startAt = this.startAt.setDate(this.startDate - 1);
  </code></pre>
  
  <p><a href="http://plnkr.co/edit/wRAa5eyW5cTCdKEBIcXI?p=preview" rel="nofollow noreferrer">Here</a> is a Plunkr of attempting to set the <code>startAt</code> date to yesterday.</p>
  
  <p>What am I missing?</p>