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https://github.com/pydata/xarray/issues/3942#issuecomment-965599998 https://api.github.com/repos/pydata/xarray/issues/3942 965599998 IC_kwDOAMm_X845jeL- 2448579 2021-11-10T18:01:46Z 2021-11-10T18:01:46Z MEMBER

Please may I ask: Why not default to xarray encoding time as 'units': 'nanoseconds since 1970-01-01' to be consistent with np.datetime64[ns]?

It's choosing the highest resolution that matches the data, which has the benefit of allowing the maximum possible time range given the data's frequency: https://github.com/pydata/xarray/blob/5871637873cd83c3a656ee6f4df86ea6628cf68a/xarray/coding/times.py#L317-L319

I'm not sure if this is why it was originally chosen; but that is one advantage. Perhaps @spencerkclark has some insight here.

 
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