Over-achieving
I just learned that the PostgreSQL timestamp data type supports dates in the range of 4713 BC to 5874897 AD.
The former is literally prehistoric. Prehistoric doesn’t have a fixed definition — it means predating written history and is defined differently for different cultures. The oldest known calendar (in Egypt) was established in 4241 BC, so anything prior to that is prehistoric by any measure.
The latter is almost certainly post-historic.
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