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https://issues.apache.org/jira/browse/NIFI-2900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15575272#comment-15575272
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ASF GitHub Bot commented on NIFI-2900:
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Github user simplesteph commented on the issue:

    https://github.com/apache/nifi/pull/1136
  
    Hi,
    
    I understand the concern. The tests were passing on my end, but maybe 
something has been broken.
    
    Let me explain the rationale:
    1) Your API should comply with the OpenAPI specs as you're using swagger 
and date-time (see 
https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md). A 
datetime looks like this: 
https://xml2rfc.tools.ietf.org/public/rfc/html/rfc3339.html#anchor14. Example:  
     1985-04-12T23:20:50.52Z or       1996-12-19T16:39:57-08:00. Knowing this, 
two solutions: either you rename your variable to "string" (and then the 
expectations are set), or if you keep date-time, you need to merge my changes.
    2) Regarding the UI: in my PR, I chosen to have timestamps with zones, 
meaning the timestamp will be adapted from where the NiFi instance is running 
(so not UTC). That's a good first step. The second step is to have the UI 
website format the date it's receiving from the now-valid REST API, and that's 
probably something we may want to add in this PR, or in a separate one. FYI- I 
have tested the UI and things aren't broken as far as I can see
    3) For breaking the existing clients: which clients are you talking about?
    
    Looking forward to reading from you


> DateTime API Endpoints don't respect RFC 3339
> ---------------------------------------------
>
>                 Key: NIFI-2900
>                 URL: https://issues.apache.org/jira/browse/NIFI-2900
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>    Affects Versions: 1.0.0
>            Reporter: Stephane Maarek
>
> Hi,
> the endpoint /flow/process-group/id is supposed to return lastRefreshed as 
> part of ProcessGroupFlowDTO as a DateTime, as indicated here:
> lastRefreshed string (date-time)      optional        The time the flow for 
> the process group was last refreshed.
> as it currently stands, what I am getting doesn't look like a timestamp:
> "lastRefreshed":"14:02:46 AEDT"
> I'm not sure how much of the overall API is affected
> Edit:
> Actually, it seems every date a "date-time" is created we expect the format 
> "HH:mm:ss z".
> As per the OpenAPI specs, if a field is annotated "date-time", it should 
> respect the RFC 3339 convention 
> (https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md#data-types).
>  



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