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https://issues.apache.org/jira/browse/FLINK-10284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16609385#comment-16609385
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Hequn Cheng commented on FLINK-10284:
-------------------------------------

[~wind_ljy] Thanks for pointing this out. I take a quick look at the code. 
There are probably no need to change the code, since `offset -8` and `offset 
16` would be same for you. However, I think we should correct the document. 
What do you think?

> TumblingEventTimeWindows's offset should can be less than zero.
> ---------------------------------------------------------------
>
>                 Key: FLINK-10284
>                 URL: https://issues.apache.org/jira/browse/FLINK-10284
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming
>    Affects Versions: 1.6.0
>            Reporter: Jiayi Liao
>            Assignee: Jiayi Liao
>            Priority: Major
>
> My goal is to create a window from 0am to the next day's 0am within GMT+8 
> timezone, so I choose to use TumblingEventTimeWindows.of(Time.of(1, 
> TimeUnit.DAYS)), which uses UTC timezone to implement the range of "day". And 
> it doesn't allow me to write an offset -8 in the TumblingEventTimeWindows, 
> which can help me fix the offset of timezone.



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