Github user windpiger commented on the issue:

    https://github.com/apache/spark/pull/15803
  
    @srowen UTC timestamp(long) is the standard time, no matter it is 
translated to which timezone, the long value is the same. But the readable date 
string should be nicely adapter to the user's browser's local timezone, for 
example, I run the spark job in Cluster which is located in UTC+8(utc timestamp 
is ts),and the user A view the historyserver in UTC+7, the brower of A should 
translate ts to UTC+7's date string, while the user B view in UTC+5, the brower 
of B should translate ts to UTC+5's data string.
    
    so I think UTC/GMT timestamp should keep in spark system, and the browser 
is responsible for the translate from UTC to local timezone.


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