issue_comments: 565452240

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https://github.com/pydata/xarray/issues/3349#issuecomment-565452240 https://api.github.com/repos/pydata/xarray/issues/3349 565452240 MDEyOklzc3VlQ29tbWVudDU2NTQ1MjI0MA== 81219 2019-12-13T14:04:23Z 2019-12-13T14:04:23Z CONTRIBUTOR

Started to work on this and facing some issues with the x-coordinate when its a datetime. For standard calendars, I can use pd.to_numeric(da.time), but for non-standard calendars, it's not clear how to go ahead. If I use xr.coding.times.encode_cf_datetime(coord), the coefficients we'll find will only make sense in the polyval function if we use the same time encoding. 

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