title: How to disable several date using isInvalidDate in date range picker
body: <p>I want disable several date in date range picker.</p>
  
  <p>I can disable from 10 Oct 2017 - 15 Oct 2017, as follows : </p>
  
  <pre><code>var cekA = document.getElementById('HF_StartDateBlockMasterPage').value;
  var cekB = document.getElementById('HF_EndDateBlockMasterPage').value;
  
  $('#daterange').daterangepicker({
      isInvalidDate: function (date) {
          var formatted = date.format('YYYY-MM-DD');
          if (date &gt;= moment(cekA) &amp;&amp; date &lt;= moment(cekB)) {
              return true;
          }
      }
  });
  </code></pre>
  
  <p>and that code working fine.</p>
  
  <p>But what if I want disable from 10 Oct 2017 to 15 Oct 2017 and again 25 Oct 2017 to 30 Oct 2017?
  <a href="https://codepen.io/travsys/pen/LjvPEW" rel="noreferrer">example my html</a></p>