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https://issues.apache.org/jira/browse/ARROW-14822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17455227#comment-17455227
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Joris Van den Bossche commented on ARROW-14822:
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Pandas indeed only implements rounding to "fixed size" frequencies/intervals 
(so day or less). But I think that's more a practical reason that this is not 
supported (easier to implement). But so I think it is fine to add in Arrow if 
we have the utilities for that (through date.h)

> [C++] Implement floor/ceil/round for temporal objects
> -----------------------------------------------------
>
>                 Key: ARROW-14822
>                 URL: https://issues.apache.org/jira/browse/ARROW-14822
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Nicola Crane
>            Assignee: Rok Mihevc
>            Priority: Minor
>              Labels: kernel, pull-request-available
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> This would enable us to implement the linked R ticket



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