Serialize DateFormatString

IList<DateTime> dateList = new List<DateTime>
{
    new DateTime(2009, 12, 7, 23, 10, 0, DateTimeKind.Utc),
    new DateTime(2010, 1, 1, 9, 0, 0, DateTimeKind.Utc),
    new DateTime(2010, 2, 10, 10, 0, 0, DateTimeKind.Utc)
};

string json = JsonConvert.SerializeObject(dateList, new JsonSerializerSettings
{
    DateFormatString = "d MMMM, yyyy",
    Formatting = Formatting.Indented
});

Console.WriteLine(json);
// [
//   "7 December, 2009",
//   "1 January, 2010",
//   "10 February, 2010"
// ]