You can use a tumbling processing time window with an offset of 13 hours + your 
time zone offset.

https://ci.apache.org/projects/flink/flink-docs-release-1.12/dev/stream/operators/windows.html#tumbling-windows
https://ci.apache.org/projects/flink/flink-docs-release-1.12/api/java/org/apache/flink/streaming/api/windowing/assigners/TumblingProcessingTimeWindows.html


From: Abhinav Sharma <abhinavandfrie...@gmail.com>
Sent: Tuesday, February 2, 2021 5:27 AM
To: user@flink.apache.org
Subject: Event trigger query

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attachments.

Newbie question: How can I set triggers to stream which execute according to 
system time? Eg: I want to sum the elements of streams at 1PM everyday.

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