MaxGekk commented on issue #24195: [SPARK-25496][SQL] Deprecate 
from_utc_timestamp and to_utc_timestamp
URL: https://github.com/apache/spark/pull/24195#issuecomment-519176604
 
 
   >  Of course, I could try to compute the time-dependent offset and shift by 
it. But then I would start implementing timezone-logic, which is tricky to get 
right.
   
   It seems you need a function which takes timestamps and zone id columns and 
returns zone offset as day-second interval. Like the code:
   ```
   zoneId.getRules().getOffset(instant)
   ```
   You can turn on `spark.sql.datetime.java8API.enabled` and write an UDF which 
takes an instance of `java.time.Instant` and a string with zone id.

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