rok commented on issue #38488:
URL: https://github.com/apache/arrow/issues/38488#issuecomment-1782876673
This is a gotcha I hit myself occasionally. While `date64` stores dates with
millisecond precision it still stores them rounded to day, so your timestamp
gets rounded (floored) to nearest midnight. A more natural choice of unit here
would be pa.timestamp("ms").
See arrow's definition of `date64` below:
https://github.com/apache/arrow/blob/6e6fd0a30aebee6738bb4bb703344f0c866debea/format/Schema.fbs#L240-L253
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