domoritz commented on PR #40892:
URL: https://github.com/apache/arrow/pull/40892#issuecomment-2030786983

   We do construct dates for DateMillisecond already so I figured it would make 
sense to do the same for TimestampMillisecond.
   
   > IIRC constructing date instances is relatively expensive esp. if using 
custom locales, so users should opt-in to that behavior if they need it?
   
   I did not measure it but wit surprises me a bit since I expected it to just 
be a lightweight wrapper around timestamps. I'd be okay with just retuning 
numbers to be fast but also to introduce an iterator for vectors that returns 
convenient types in JS that may be slower but easier to work with (in a follow 
up PR). 


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