title: How to get timestamp value of only date
body: <p>I am new to Node Js
  I am using <strong>Date.now()</strong> to get the timestamp of current time<br>
  But i wanted the timestamp value of only current date not including the time.<br>
  For Example<br>
  Now current time is  <em>August 9, 2017 8:19:28 PM</em> and the timestamp will be <em>1502309968000</em> 
  But I want timestamp of only <em>August 9, 2017 12:00:00 AM</em> and the timestamp will be <em>1502236800000</em><br>
  How to solve this ?</p>