Jc3s5h added a comment. We have "universe" (Q1) which displays the start date as " 13798 million years BCE Gregorian" (Gregorian is a superscript). But the furthest back one could possibly extrapolate the proleptic Gregorian calendar was the first time the Earth rotated on its axis, which was much later (around 4,540 million years ago, measured in constant length seconds). So the date stated for the start of the universe in wikidata is false because the calendar was undefined and beyond any plausible extrapolation procedure at the time of the event.
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