Pint issue for undecoded times about xmip HOT 4 OPEN

basically. I'm guessing that units = "seconds since 2020-01-01 00:00:00" or similar, and that pint is complaining that the - don't make sense in a units definition.
I think the best way to fix this would be to have .pint.quantify ignore units attributes with a format of "{unit} since {datetime}" (but still raise if you pass a unit like that as a parameter).

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Is this just telling us that one of your units strings is something that pint's parser is unable to parse?

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This only happens if cf units are not decoded, right? So maybe ignoring undecoded units (xarray should keep track of those) would be the most prudent solution? I wonder if there are other cases of e.g. scaled data variables (decoding might multiply + add values), where you do not want pint to act?

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