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https://issues.apache.org/jira/browse/FLINK-4282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15426422#comment-15426422
 ] 

ASF GitHub Bot commented on FLINK-4282:
---------------------------------------

Github user aljoscha commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2355#discussion_r75305677
  
    --- Diff: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/windowing/assigners/SlidingEventTimeWindows.java
 ---
    @@ -52,16 +52,19 @@
     
        private final long slide;
     
    -   protected SlidingEventTimeWindows(long size, long slide) {
    +   private final long offset;
    +
    +   protected SlidingEventTimeWindows(long size, long slide,long offset) {
                this.size = size;
                this.slide = slide;
    +           this.offset = offset;
        }
     
        @Override
        public Collection<TimeWindow> assignWindows(Object element, long 
timestamp, WindowAssignerContext context) {
                if (timestamp > Long.MIN_VALUE) {
                        List<TimeWindow> windows = new ArrayList<>((int) (size 
/ slide));
    -                   long lastStart = timestamp - timestamp % slide;
    +                   long lastStart = 
TimeWindow.getWindowStartWithOffset(timestamp,offset,slide);
    --- End diff --
    
    Missing spaces after comma.


> 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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