#422 - Update datetime to use Java8 time rather than old Date object

Martin Lowe requested to merge malowe/membership.eclipse.org:malowe/dev/442 into dev

As described in the noteblock under https://quarkus.io/guides/rest-json#creating-the-maven-project, Java 8 time library support has already been included. This uses ISO-8601 standards, of which RFC-3339 is a subset of. This support produces an output like 2022-02-19T21:07:58Z which is in spec.

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