How are window's boundaries decided in flink

[Sachin Mittal]

Hi,
Lets say I have defined 1 minute TumblingEventTimeWindows.
So it will create windows as:
(0, 60), (60, 120), ....

Now lets say I have an event at time t = 60.
In which window would this get aggregated ?
1st or second or both.

Say I want this to get aggregated only in the second window, how can I
achieve this ?


Thanks
Sachin