JSON DateTime Conversion Problem

var json = JsonConvert.SerializeObject(someObject, new JsonSerializerSettings() { DateFormatString = "yyyy-MM-ddThh:mm:ssZ" });

or

var json = JsonConvert.SerializeObject(someObject, Formatting.Indented, new JsonSerializerSettings() { DateFormatString = "yyyy-MM-ddThh:mm:ssZ" })

or

string json = JsonConvert.SerializeObject(yourObject,
   new IsoDateTimeConverter() { DateTimeFormat = "yyyy-MM-dd HH:mm:ss" });

I did this and it worked

[HttpGet]
public string GetSummaryData(string reportDate)
{
  var reportDateParsed = DateTime.ParseExact(reportDate, "yyyyMMdd", CultureInfo.InvariantCulture, DateTimeStyles.None);
  var json = JsonConvert.SerializeObject(_dashboard.GetSummaryData(reportDateParsed), new JsonSerializerSettings() { DateFormatString = "yyyy-MM-ddThh:mm:ssZ" });
  return json;
}