Jc3s5h added a comment. If you're going to do comparisons and queries on the basis of the stored date, and ignore precision, before, and after, then the results are going to be rough. Given that comparisons and queries are inevitably inaccurate, why not obey the data model and convert year 0 in the database to year 0 in XSD 1.1. Sure, it's wrong for many of the entries currently in the database, but the comparisons are inaccurate anyway. I like the idea of making it as painfully obvious to everyone that much of the data in the database is wrong. Keep screaming LIAR LIAR PANTS ON FIRE ! at every opportunity until it gets fixed.
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