| Ghouston added a comment. |
The actual bug is that some software (such as the Wikidata user interface) doesn't seem to be following the definition of the "precision" field in a date.
Precision, as described at https://www.wikidata.org/wiki/Help:Dates, specifies how many digits of the date string should be ignored.
E.g., +2018-06-00T00:00:00Z is not a valid date, but with precision 10 (month) it specifies the range 2018-06-01 to 2018-06-30.
With precision 7 (century) it specifies the range 2000-01-01 to 2099-12-31. When this date is entered into a Wikidata field and precision set to 7, it displays "21 .century". This would be OK if it was generally accepted that Wikidata takes the century as 2000-2099, and not 2001-2101 as is sometimes used.
However, if the date +2000-00-00T00:00:00Z if entered with precision 7, the user interface displays it as "20 .century", which is now confusing everybody. I suggested avoiding the word "century" entirely.
Cc: Aklapper, Jc3s5h, Ghouston, kaldari, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, Wikidata-bugs, aude, Mbch331
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