 <p>You don't need to do the roundtrip to DatetimeIndex, as these methods are avaliable for a Series (column) as well through the <code>dt</code> accessor:</p> <pre><code>aht['call_start'] = aht['start'].dt.tz_localize('US/Eastern').dt.tz_convert('US/Central') </code></pre> <p>And the same for <code>end</code>.<br> To remove the timezone information but keep it in the local time, you do another <code>.dt.tz_localize(None)</code> afterwards (see this question: <a href="http://stackoverflow.com/a/34687479/653364">http://stackoverflow.com/a/34687479/653364</a>)</p>