jayvdb added a comment.
The final fix for this problem is probably going to depend on https://phabricator.wikimedia.org/T71255 , which is a complex but low priority problem.
As an interim measure, you should be able use the following in your user-config.py to bypass this problem
family = 'wikidata' mylang = 'en'
That should let you continue to find other bugs in using the date module when used with Wikidata.
(Also, due to https://phabricator.wikimedia.org/T85331 not being implemented, you'll need to test using the 'wikidata' family distributed as pywikibot/families/wikidata_family.py , as it has hard-coded data needed to use wikidata)
TASK DETAIL https://phabricator.wikimedia.org/T85645
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