issue_comments: 565462443

This data as json

html_url issue_url id node_id user created_at updated_at author_association body reactions performed_via_github_app issue
https://github.com/pydata/xarray/issues/3349#issuecomment-565462443 https://api.github.com/repos/pydata/xarray/issues/3349 565462443 MDEyOklzc3VlQ29tbWVudDU2NTQ2MjQ0Mw== 6628425 2019-12-13T14:33:53Z 2019-12-13T14:33:53Z MEMBER

If I understand correctly, pd.to_numeric (and its inverse) works because it always uses 1970-01-01T00:00:00 as the reference date. Could we do something similar when working with cftime dates?

Within xarray we typically convert dates to numeric values (e.g. when doing interpolation) using xarray.core.duck_array_ops.datetime_to_numeric, which takes an optional offset argument to control the reference date. Would it work to always make sure to pass 1970-01-01T00:00:00 with the appropriate calendar type as the offset when constructing the ordinal x-coordinate for polyfit/polyval?

 
{
    "total_count": 0,
    "+1": 0,
    "-1": 0,
    "laugh": 0,
    "hooray": 0,
    "confused": 0,
    "heart": 0,
    "rocket": 0,
    "eyes": 0
}
   499477363