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https://issues.apache.org/jira/browse/FLINK-4282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15401232#comment-15401232
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Aljoscha Krettek commented on FLINK-4282:
-----------------------------------------

The offset should be an additional (optional) parameter for the window 
assigners that is {{0}} by default. Then the computation that determines that 
start of a window just needs to be shifted by that offset.

> 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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