> Gotcha. "Assume timezone" is like "tz_localize" in pandas.

Indeed!

> I didn't see any target timezone information being passed in the "cast"
> function - how would I do that?

Just cast with:
auto options = CastOptions::Safe(timestamp(TimeUnit::NANO, "America/New_York"));
See examples in:
https://github.com/apache/arrow/blob/master/cpp/src/arrow/compute/kernels/scalar_cast_test.cc

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