title: Jackson JSON schema date
body: <p>I would like to generate a JSON <strong>schema</strong> of a class with a java.util.Date field.
  For fields with type Date I am getting: </p>
  
  <p>"fieldName" :   {
        "type": "integer",
        "format": "UTC_MILLISEC"
      }</p>
  
  <p>What i would like is something like:</p>
  
  <p>"fieldName" :{ "type": "string", "format": "date-time" }</p>
  
  <p>I would like this configuration to be global for all POJOS and not only for a specific POJO.
  So, an annotation on a specific class will not help me.</p>
  
  <p>Thanks!</p>