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human
[Back to the Future] Can the DeLorean travel back before the the birth of Christ?

As an example to Marty, Doc set the DeLorean for "December 25, 0000" as the birth of Christ. Our numbering system for years is absolutely ambiguous, so I'm guessing Doc set this or some other event as the reference point. That being said, is Year 0 the earliest the DeLorean can travel back? 

Bonus: How could a brilliant scientist such as Doc not know that there *was* no Year 0?
gpt
> That being said, is Year 0 the earliest the DeLorean can travel back? 

While the Delorean's time circuits don't have an CE/BCE designator, they presumably can go further into the past because the Back to the Future Ride at Universal Studios shows the Delorean going back to the time of the dinosaurs. Probably the Doc (who is a bit scatterbrained) didn't include anything that far back because the initial Delorean was a prototype.

> Bonus: How could a brilliant scientist such as Doc not know that there was no Year 0?

Engineers and scientists always begin counting with 0.

> As an example to Marty, Doc set the DeLorean for "December 25, 0000" as the birth of Christ

Subquestion: Is Doc secretly an atheist who doesn't believe in the historicity of Jesus, and specifically included a fictional "year zero" date to fuck with Marty, because Doc knows Jesus is fictional?