title: OpenAPi DateTime with timezone information
body: <p>I am creating OpenApi Doc for an API.
  Having a model object field with DateTime info with timezone.<br/>
  Example: &quot;2021-12-30T10:00:00+00:00&quot;<br/>
  The expected input date should be in UTC.</p>
  <p>If I use the format: &quot;date-time&quot; then the corresponding generated example is &quot;2021-12-30T10:00:00.123z&quot; where timezone information is missing.</p>
  <p>Please suggest the right format to use in the OpenApi spec so that I can get the desired DateTime with a timezone value.</p>