rok commented on issue #686:
URL: 
https://github.com/apache/arrow-datafusion/issues/686#issuecomment-884535895


   Agreed with @adamhooper - as I user I would strongly dislike the row 4 
behavior as it would make my logic a function of the environment I'd run it on 
instead of only a function the input.
   
   Keep in mind that timezones can have nonexistent and ambiguous times that 
need to be handled when "localizing" (converting wall time) to UTC. In arrow 
there's an [open 
PR](https://github.com/apache/arrow/pull/10610/files#diff-19248dfd2de25c17622290aae9c78024ba474de2913e44bc8cf0dce0bfe7dcda)
 for a `tz_localize` kernel.


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