title: Convert time coordinates from UTC to local timezone with xarray
body: <p>My question is how to convert the UTC time coordinates in the time dimension to teh local timezone (e.g. Australian Eastern Standard Time (AEST), +10 or +11 depending on summer saving)</p>
  
  <pre><code>import xarray as xr
  import pandas as pd
  time = pd.date_range('2000-01-01', freq='H', periods=365 * 24)
  ds = xr.Dataset({'foo': ('time', np.arange(365 * 24)), 'time': time})
  
  print(ds)
  </code></pre>
  
  <p>Outputs:</p>
  
  <pre><code>&lt;xarray.Dataset&gt;
  Dimensions:  (time: 8760)
  Coordinates:
    * time     (time) datetime64[ns] 2000-01-01 ... 2000-12-30T23:00:00
  Data variables:
      foo      (time) int32 0 1 2 3 4 5 6 7 ... 8753 8754 8755 8756 8757 8758 8759
  </code></pre>
  
  <p>Can the UTC time coordinates be converted to AEST supported by summer saving time? All time related operations in xarray should still work on the new time dimension.</p>