issue_comments: 583355144

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https://github.com/pydata/xarray/issues/3751#issuecomment-583355144 https://api.github.com/repos/pydata/xarray/issues/3751 583355144 MDEyOklzc3VlQ29tbWVudDU4MzM1NTE0NA== 6628425 2020-02-07T11:40:44Z 2020-02-07T11:40:44Z MEMBER

FWIW, I think @jbrockmendel is still progressing on an "extension index" interface where you could have a custom dtype / Index subclass that would be properly supported. Long-term, that's the best solution.

Nice -- I look forward to being able to try that out!

any idea what other is here? looks like it might be a DatetimeIndex

@jbrockmendel agreed that it's unclear -- we probably should have written the code for that method in a clearer way. I think it's mainly used for subtracting a single datetime.timedelta or NumPy array of datetime.timedelta objects from a CFTimeIndex. In both of those cases we would expect the result to remain a CFTimeIndex.

cftime.datetime objects often represent dates from non-standard calendars (e.g. calendars with no leap year, or calendars where all months have 30 days), so in general they are not compatible with the dates used in a DatetimeIndex. Subtracting like-calendar cftime.datetime objects is fair game though, and we'd like that to produce timedeltas.

 
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