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https://issues.apache.org/jira/browse/CASSANDRA-14724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16617389#comment-16617389
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Benjamin Lerer commented on CASSANDRA-14724:
--------------------------------------------
Sorry I got confused too. :-(
Internally C* always store {{timestamps}} and {{dates}} in UTC time. As UTC
does not change with a change of seasons we are not impacted by DST.
> 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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