message: fix: Ioutput dates as ISO 8601 strings in JSON Formatter
  kudos to
diff: @@ -35,6 +35,8 @@ function valueToHTML(value) {
  level++;
  output += arrayToHTML(value);
  level--;
  + } else if (value && value.constructor === Date) {
  + output += decorateWithSpan('"' + value.toISOString() + '"', 'type-string');
  } else if (valueType === 'object') {
  level++;
  output += objectToHTML(value);
  