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https://issues.apache.org/jira/browse/FLINK-4282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15413645#comment-15413645
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Aljoscha Krettek commented on FLINK-4282:
-----------------------------------------

The {{WindowAssigner}} should not try to shift the timestamp around or do 
anything fancy. Specifying a timezone should just be another way of specifying 
where hours start with respect to UTC. (I brought this up just because there 
are some "exotic" time zones that are not shifted by exact hours compared to 
UTC.) 

> Add Offset Parameter to WindowAssigners
> ---------------------------------------
>
>                 Key: FLINK-4282
>                 URL: https://issues.apache.org/jira/browse/FLINK-4282
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>            Reporter: Aljoscha Krettek
>
> Currently, windows are always aligned to EPOCH, which basically means days 
> are aligned with GMT. This is somewhat problematic for people living in 
> different timezones.
> And offset parameter would allow to adapt the window assigner to the timezone.



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