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https://issues.apache.org/jira/browse/ARROW-413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15736242#comment-15736242
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Uwe L. Korn commented on ARROW-413:
-----------------------------------

Looking at the current implementation, it seems that the constructor of 
{{org.joda.time.DateTime}} is called with a {{long}} and thus is interpreted by 
joda as milliseconds since 1970. So it actually is similar to Timestamp expect 
that it has no explicit unit.

> DATE type is not specified clearly
> ----------------------------------
>
>                 Key: ARROW-413
>                 URL: https://issues.apache.org/jira/browse/ARROW-413
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Format
>    Affects Versions: 0.1.0
>            Reporter: Uwe L. Korn
>
> Currently the DATE type is not specified anywhere and needs to be documented.



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