HeartSaVioR commented on pull request #33061:
URL: https://github.com/apache/spark/pull/33061#issuecomment-873854557


   `"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"`
   
   Here the 'Z' refers to the "UTC", according to the ISO 8601. See 
https://en.wikipedia.org/wiki/ISO_8601
   
   Using local timezone makes more confusion, especially when someone needs to 
provide the information to other one who lives in different time zone. This 
occasionally happens to us.
   
   It's OK to show the time as local time zone (converted), but for the source 
of truth, storing time as UTC should give less confusion.


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