[jira] [Created] (FLINK-6743) .window(TumblingEventTimeWindows.of(Time.days(1), Time.hours(-8))) doesn't work

[Shang Yuanchun (Jira)]

Lix created FLINK-6743:
--------------------------

             Summary: .window(TumblingEventTimeWindows.of(Time.days(1), Time.hours(-8))) doesn't work
                 Key: FLINK-6743
                 URL: https://issues.apache.org/jira/browse/FLINK-6743
             Project: Flink
          Issue Type: Bug
          Components: DataStream API
         Environment: Flink 1.2.0 and above.
            Reporter: Lix


The tutorial on the official website says that we can use

```
// daily tumbling event-time windows offset by -8 hours.
input
    .keyBy(<key selector>)
    .window(TumblingEventTimeWindows.of(Time.days(1), Time.hours(-8)))
    .<windowed transformation>(<window function>);
```

when our timezone is UTC+8, which is in China. But when I tried to run this code, it just reported an error:

```
Exception in thread "main" java.lang.IllegalArgumentException: TumblingProcessingTimeWindows parameters must satisfy  0 <= offset < size
        at org.apache.flink.streaming.api.windowing.assigners.TumblingProcessingTimeWindows.<init>(TumblingProcessingTimeWindows.java:54)
        at org.apache.flink.streaming.api.windowing.assigners.TumblingProcessingTimeWindows.of(TumblingProcessingTimeWindows.java:111)
```

How then, should I write my code to make a tumbling window which clears every day at 00:00, when my timezone is UTC+8?




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