title: Determine historical UTC offset given lat, long, date
body: <p>Some locations change have changed timezones (&amp; UTC offset) over time - Louisville, KY in 1949 was in CST (-6) but is currently EDT (-4):
  <a href="https://www.timeanddate.com/time/zone/usa/louisville?year=1945" rel="nofollow noreferrer">https://www.timeanddate.com/time/zone/usa/louisville?year=1945</a></p>
  <p>Most lat/long libraries will return the current timezone, but I need to determine the historical timezone &amp; utc offset, given lat/long and UTC date.</p>
  <p>Does nodatime (which includes the Tzdb Olson historical data) have this functionality or maybe in combination with another library?</p>