alamb commented on issue #9580:
URL: 
https://github.com/apache/arrow-datafusion/issues/9580#issuecomment-1997467876

   > And, add a scalar function to convert a date to a specific time zone as 
per the HowTo 
[here](https://arrow.apache.org/datafusion/contributor-guide/index.html#how-to-add-a-new-scalar-function)
 so that it can be used by `sql_named_function_to_expr` to get the Result.
   
   Since the Timezone is encoded in the DataType I think you could call 
`Expr::Cast` with a DataType that had the appropriate timezone -- e.g. set the 
timezone correctly 
https://docs.rs/arrow/latest/arrow/datatypes/enum.DataType.html#variant.Timestamp
 and then cast the expression to that type


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