title: Check if date is within X number of days of today
body: <p>I have a date variable being set on my page like this:</p>
  
  <pre><code>startDate =  "03/28/2017";
  </code></pre>
  
  <p>How can I check if that date is 7 or less days before <strong>today's</strong> date?</p>
  
  <p>It will need to be used in a conditional if statement.</p>