Github user mcgilman commented on the issue: https://github.com/apache/nifi/pull/1136 NiFi follows the semantic versioning guidelines. What your suggesting is changing the meaning of those fields. They are strings that are meant to be human-readable (one with the time and the other with the date and time). If we change them, we could be affecting any existing clients of that API that expect them to be human-readable strings. The clients I'm referring is anyone consuming this API in an existing version of NiFi. As you mentioned, in our case we would need to update the UI (which is a client of this API) to reformat it as necessary. This is not something we would expect others to do in a minor/incremental version change or without somehow versioning the API. As I mentioned earlier, I believe that any field using a JAXB adapter is currently being interpreted incorrectly by Swagger. While it would be nice if Swagger could correctly determine the actual data type (a string in this case and not a date-time) it appears they at least provide a mechanism for setting it explicitly. We should be taking advantage of that.
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