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https://issues.apache.org/jira/browse/FLINK-4282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15402339#comment-15402339
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Aljoscha Krettek commented on FLINK-4282:
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For most timezones this is valid but there are some that have hour + 15 min, 30
min or 45 min differences to UTC 0:
https://en.wikipedia.org/wiki/List_of_UTC_time_offsets
For now, it sounds far fetched but for those cases you would also need to have
the offset so that hours align correctly. If we need the offset to do "hourly,
but starting at quarter past" then we also solve this case, however.
> 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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