Craig Smoothey created FLINK-21803:
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Summary: Tumbling / Sliding windows are unaware of daylight
savings time
Key: FLINK-21803
URL: https://issues.apache.org/jira/browse/FLINK-21803
Project: Flink
Issue Type: Improvement
Components: API / Core
Affects Versions: 1.12.2
Reporter: Craig Smoothey
It is currently possible to specify an "offset" for tumbling / sliding windows.
The offset is however immutable. This creates a problem for aggregations that
have to be performed in a timezone which utilises daylight savings time for
half of the year. For example. If one is aggregating data by day in the New
York time zone, then for half of the year, the offset is 5 hours (relative UTC)
and for the other half of the year, the offset is 4 hours (relative UTC). There
is no way to construct tumbling / sliding windows to specify daylight savings
time behaviour. It would be helpful if there was a constructor for tumbling /
sliding windows to specify the timezone that the aggregation must be performed
in (default = UTC). The tumbling / sliding window would then be required to
automatically change the offset depending on whether daylight savings time is
active or not for the specified time zone.
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