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https://issues.apache.org/jira/browse/CASSANDRA-14724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16617583#comment-16617583
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Benjamin Lerer commented on CASSANDRA-14724:
--------------------------------------------

We do not accept any TZ conversion but even if we do one day the current 
Duration type will be able to support it as long as we change the addition code 
logic. 

> Duration addition to Date/Timestamp is broken for leapseconds
> -------------------------------------------------------------
>
>                 Key: CASSANDRA-14724
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14724
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Benedict
>            Assignee: Benjamin Lerer
>            Priority: Major
>              Labels: correctness
>
> Hours, Minutes and Seconds are not always of the same duration; it varies 
> when they cross a leap second (or DST boundary).  When we add durations to 
> instants, we do not account for this (as we have by then lost the necessary 
> information).  Duration should take (and store) all components of time.



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