Lucas_Werkmeister_WMDE added a comment.

  It turns out the pull request introduces some changes that may not be wanted. 
Currently (since Partial support for thousands separators in DateTimeParsers 
<https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Wikibase/+/119973>), we 
allow thousands separators in BC dates, under the assumption that “negative 
dates usually don’t have a month”. So you currently get the following parses 
(API request 
<https://www.wikidata.org/w/api.php?action=wbparsevalue&format=json&datatype=time&values=1%20BC%7C10%20BC%7C100%20BC%7C1%20000%20BC%7C10%20000%20BC%7C100%20000%20BC%7C1%20000%20000%20BC%7C10%20000%20000%20BC>):
  
  - 1 BC: -0001-00-00T00:00:00Z, precision 9
  - 10 BC: -0010-00-00T00:00:00Z, precision 9
  - 100 BC: -0100-00-00T00:00:00Z, precision 9
  - 1 000 BC: -1000-00-00T00:00:00Z, precision 9
  - 10 000 BC: -10000-00-00T00:00:00Z, precision 5
  - 100 000 BC: -100000-00-00T00:00:00Z, precision 4
  - 1 000 000 BC: -1000000-00-00T00:00:00Z, precision 3
  - 10 000 000 BC: -10000000-00-00T00:00:00Z, precision 2
  
  (The precision jumps because we “default to year precision for range 4000 BC 
to 4000” in `IsoTimestampParser::getPrecisionFromYear()`.)
  
  With the change to the `YearMonthTimeParser`, you instead get:
  
  - 1 BC: -0001-00-00T00:00:00Z, precision 9
  - 10 BC: -0010-00-00T00:00:00Z, precision 9
  - 100 BC: -0100-00-00T00:00:00Z, precision 9
  - 1 000 BC: -0000-**01-00**T00:00:00Z, precision **10**
  - 10 000 BC: -0000-**10-00**T00:00:00Z, precision **10**
  - 100 000 BC: -100000-00-00T00:00:00Z, precision 4
  - 1 000 000 BC: -1000000-00-00T00:00:00Z, precision 3
  - 10 000 000 BC: -10000000-00-00T00:00:00Z, precision 2
  
  Put differently: do we want to parse “1 234 BC” as 1234 BC, or as January 234 
BC?

TASK DETAIL
  https://phabricator.wikimedia.org/T233105

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To: Lucas_Werkmeister_WMDE
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