(Q18636219)
Statements
Constraint clarification: as -0001-12-31T00:00:00Z is 31 December 1 BCE (not Astronomical year numbering) and +0000-01-01T00:00:00Z is a nonsense 1 January 0, there is need in constrait for zero years (English)
-0001は紀元前1年 (Japanese)
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