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https://issues.apache.org/jira/browse/FLINK-6214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16313293#comment-16313293
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Aljoscha Krettek commented on FLINK-6214:
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Nope, no reason except no-one has gotten around to it yet.
> WindowAssigners do not allow negative offsets
> ---------------------------------------------
>
> Key: FLINK-6214
> URL: https://issues.apache.org/jira/browse/FLINK-6214
> Project: Flink
> Issue Type: Bug
> Components: DataStream API
> Affects Versions: 1.2.0
> Reporter: Timo Walther
>
> Both the website and the JavaDoc promotes
> ".window(TumblingEventTimeWindows.of(Time.days(1), Time.hours(-8))) For
> example, in China you would have to specify an offset of Time.hours(-8)". But
> both the sliding and tumbling event time assigners do not allow offset to be
> negative.
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