Fix dayofweek and dayofyear attributes from dates generated by cftime_range #2633
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It turns out there was a remaining bug in cftime (Unidata/cftime#106) that impacted the results of the
dayofwkanddayofyrattributes of cftime objects generated by theirreplacemethod, which we use when parsing dates from strings, and in some offset arithmetic.A workaround is to add a
dayofwk=-1argument to eachreplacecall where thedayofwkordayofyrwould be expected to change. I've fixed this bug upstream in cftime (Unidata/cftime#108), but it will only be available in a future version. Would it be appropriate to use this workaround in xarray?This would fix this doc page for instance: