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https://issues.apache.org/jira/browse/KAFKA-7699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16709173#comment-16709173
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Matthias J. Sax commented on KAFKA-7699:
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{quote}would you want to epoch-align it like the window boundaries, or actually 
pull in a cron-like scheduling library?
{quote}
I guess this would be part of the KIP discussion. Not a clear idea atm. Just 
created the ticket for tracking :)

> Improve wall-clock time punctuations
> ------------------------------------
>
>                 Key: KAFKA-7699
>                 URL: https://issues.apache.org/jira/browse/KAFKA-7699
>             Project: Kafka
>          Issue Type: New Feature
>          Components: streams
>            Reporter: Matthias J. Sax
>            Priority: Major
>              Labels: needs-kip
>
> Currently, wall-clock time punctuation allow to schedule periodic call backs 
> based on wall-clock time progress. The punctuation time starts, when the 
> punctuation is scheduled, thus, it's non-deterministic what is desired for 
> many use cases (I want a call-back in 5 minutes from "now").
> It would be a nice improvement, to allow users to "anchor" wall-clock 
> punctation, too, similar to a cron job: Thus, a punctuation would be 
> triggered at "fixed" times like the beginning of the next hour, independent 
> when the punctuation was registered.



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