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https://issues.apache.org/jira/browse/FLINK-6214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15947887#comment-15947887
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Aljoscha Krettek commented on FLINK-6214:
-----------------------------------------

I think this might be "working as intended" and we need to fix the 
documentation and Javadoc. Limiting the offset to 0 <= offset <= size 
simplifies the implementation (if I'm not wrong). An offset of -8 can be 
achieved by "offsetting in the other direction": An offset of 24 hours equals a 
0 hours offset, an offset of 23 hours is the same as a -1 hour offset and so on.

> WindowAssigners do not allow negative offsets
> ---------------------------------------------
>
>                 Key: FLINK-6214
>                 URL: https://issues.apache.org/jira/browse/FLINK-6214
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming
>    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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