issue_comments: 388694419

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https://github.com/pydata/xarray/issues/2127#issuecomment-388694419 https://api.github.com/repos/pydata/xarray/issues/2127 388694419 MDEyOklzc3VlQ29tbWVudDM4ODY5NDQxOQ== 1217238 2018-05-14T04:32:43Z 2018-05-14T04:32:43Z MEMBER

Any multiple of 7 days (one week) seems to trigger it, e.g., ``` In [133]: np.array([datetime.timedelta(7)], dtype='timedelta64[D]')

TypeError Traceback (most recent call last) <ipython-input-133-92f07e97d8dc> in <module>() ----> 1 np.array([datetime.timedelta(7)], dtype='timedelta64[D]')

TypeError: Cannot cast datetime.timedelta object from metadata [Y] to [D] according to the rule 'same_kind' ```

For now, maybe try casting each element individually to np.timedelta64 as a work-around? e.g., In [139]: np.array([np.timedelta64(d, 'ns') for d in uniques.tolist()]) Out[139]: array([2419200000000000, 2592000000000000, 2678400000000000], dtype='timedelta64[ns]')

 
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