title: "Already tz-aware" error when reading h5 file using pandas, python 3 (but not 2)
body: <p>I have an h5 store named <code>weather.h5</code>. My default Python environment is 3.5.2. When I try to read this store I get <code>TypeError: Already tz-aware, use tz_convert to convert</code>.</p>
  
  <p>I've tried both <code>pd.read_hdf('weather.h5','weather_history')</code> and <code>pd.io.pytables.HDFStore('weather.h5')['weather_history]</code>, but I get the error no matter what.</p>
  
  <p>I can open the h5 in a Python 2.7 environment. Is this a bug in Python 3 / pandas?</p>