title: How to convert UTC to EST with Python and take care of daylight saving automatically?
body: <p>If I have a bunch of data with date &amp; time in <code>UTC format</code>, how can I convert them to <code>EST</code>. </p>
  
  <p>It can determine when they will be <code>-4(in summer)</code> and -<code>5(in winter)</code> automatically every year? 
  Thanks</p>