title: Converting datetime from one time zone to another using pytz
body: <p>I have a data set which includes date/timestamps from New York WITHOUT timezone information. EDT or EST are not recorded.</p>
  
  <p>Dates include daily data for several years, so it includes both:</p>
  
  <ol>
  <li>EDT Timezone</li>
  <li>EST Timezone</li>
  </ol>
  
  <p>I want to translate those date/timestamps to Frankfurt time.</p>
  
  <p>This involves using:</p>
  
  <ol>
  <li>CET Timezone</li>
  <li>CEST Timezone</li>
  </ol>
  
  <p>Depending on the specific date.</p>
  
  <p>I have seen that for the NY time, pytz includes <code>timezone('US/Eastern')</code>, which if I understood correctly includes both timezones (<a href="https://www.timeanddate.com/time/zone/usa/new-york-state" rel="nofollow noreferrer">New York Timezones</a>).</p>
  
  <p>For Frankfurt, it seems that you need to explicitly specify CET or CEST 
  (<a href="https://www.timeanddate.com/time/zone/germany/frankfurt" rel="nofollow noreferrer">Frankfurt Timezones</a>).</p>
  
  <p>How shall this conversion be done using pytz?</p>