issue_comments: 1530991257

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https://github.com/pydata/xarray/issues/7790#issuecomment-1530991257 https://api.github.com/repos/pydata/xarray/issues/7790 1530991257 IC_kwDOAMm_X85bQRKZ 5821660 2023-05-02T07:09:38Z 2023-05-02T08:14:36Z MEMBER

@christine-e-smit I've created an fresh environment with only xarray and zarr and it still works on my machine. I've then followed the Darwin idea and digged up #6191 (I've got those casting warnings from exactly the line you were referring to). Comment https://github.com/pydata/xarray/issues/6191#issuecomment-1209567966 should explain what happens here.

tl;dr citing @DocOtak

The short explanation is that the time conversion functions do an astype(np.int64) or equivalent cast on arrays that contain nans. This is undefined behavior and very soon, doing this will start to emit RuntimeWarnings.

There is also an open PR #7098.

Thanks @christine-e-smit for sticking with me to find the root-cause here by providing detailed information and code examples. :+1: 

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