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https://issues.apache.org/jira/browse/FLINK-4282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15418609#comment-15418609
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Aljoscha Krettek commented on FLINK-4282:
-----------------------------------------

[~RenkaiGe] yes, this is more or less what I had in mind when opening this 
issue. If you enforce that the offset obeys {{offset >= 0 && offset <= size}} 
then I think you can change {{getWindowStartWithOffset(...)}} to this:
{code}
public static long getWindowStartWithOffset(long timestamp, long offset, long 
windowSize) {
  return timestamp - (timestamp - offset) % windowSize;
}       
{code} 

> 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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